All About Blockchain, Bitcoin & Crypto for Exporters

If we start with a very interesting case study of the United Nations World Food Programme (WFP), it provides an excellent example of how blockchain technology can solve complex real-world problems.

The United Nations has been providing food to various countries, particularly to places with large numbers of refugees or people affected by food crises. This case study focuses on the United Nations Food Programme, which was actively carried out in the refugee camps in Jordan. Syrian refugees, who had escaped the bloody war, were stationed in these camps and were in urgent need of food.

The United Nations faced several major challenges in carrying out these operations. First, transferring money from the UN to local areas required the involvement of local banks that charged exorbitant fees for currency conversion and international money transfers, making the process extremely costly. A large amount of money was wasted, which could otherwise have been used to feed many more people if the transfer costs had been reduced.

Another problem the United Nations encountered was the leakage of funds due to corruption in the local distribution of food. These leakages created serious challenges for the success of the program. The World Food Programme, therefore, needed a technology that could make it easier to move funds to local authorities for purchasing and distributing food, ensuring that the right people received the aid and that everyone was included without losses at the distribution points.

The organization was looking for a solution that could minimize such leakages so that the saved money could be used to strengthen food distribution efforts and help more people. The United Nations found that blockchain technology offered an effective solution to these challenges — not only for moving funds locally but also for reducing leakages at purchasing and distribution points.

The UN decided to adopt this technology. In the implemented solution, iris scanners were used to register the beneficiaries of the food program in the refugee camps. The money could then be transferred digitally using cryptocurrencies, eliminating the role of local banks that had previously charged high commissions and fees.

The United Nations was thus able to move funds efficiently using cryptocurrencies — particularly Bitcoin — through a blockchain-based solution. In the Jordan refugee camps, all beneficiaries were registered on the blockchain using iris scanners, eliminating the need for physical identity documents like passports or ID cards, which many refugees had lost during the war or while fleeing their homes.

Even in the refugee camps in Jordan, many refugees were moving between camps or to other countries, making it difficult to maintain consistent records. By registering beneficiaries on the blockchain using iris scans, the UN made it possible for them to continue receiving aid irrespective of their location or the camp they were in.

This created a seamless solution that drastically reduced leakages at the purchasing and distribution stages, as well as in the movement of funds locally. The success of this blockchain solution prompted the United Nations to announce that it would regularly use blockchain-based systems for all World Food Programme operations worldwide.

This success story became a major milestone for blockchain technology and a powerful demonstration of its practical effectiveness. It inspired many other international organizations to follow suit and adopt blockchain-based systems in their operations.

This particular case study — involving the secure distribution of relief funds, food supplies, and beneficiary identification through iris scans — remains one of the most inspiring examples of blockchain technology in action. It clearly shows how such technology can be used for humanitarian purposes.

Another potential use of blockchain technology is in toll collection systems. In large countries like India, with thousands of kilometers of national highways and toll booths every 25 to 30 kilometers, the cost of toll collection is high, and there is significant leakage of funds at toll plazas. By using blockchain technology, the National Highways Authority of India can minimize leakage, reduce costs, and increase revenue. The authority has already announced plans for booth-less toll collection systems, and blockchain solutions can further enhance efficiency, transparency, and accountability by reducing corruption and embezzlement at collection points.

There are hundreds of potential applications for blockchain technology — in governance, business, international trade, supply chains, and logistics. Many similar challenges can be addressed using blockchain-based solutions. We will be discussing these areas in more detail later in this course.

Friends, if we now look into the rationale behind the emergence of blockchain technology and cryptocurrencies, the key question is: what is the reason for their creation?

We often fail to examine the existing monetary system and its pitfalls. We have become so accustomed to the current system that we subconsciously ignore the problems associated with our daily monetary transactions.

Consider the way we transact money today. We use plastic money in the form of credit cards and debit cards. We use online systems such as internet banking and platforms like PayPal or Payoneer — international financial organizations that appear to make local and international transactions easier. We also use various types of digital payment wallets.

What we often overlook in these systems of domestic and international transactions is that all of them involve private interests. These organizations are privately owned and motivated by profit maximization. They hold our data — information about what we purchase, how we purchase, when we purchase, and how much we spend. We freely provide this data without question, and they charge us a fee or commission for every transaction we make.

These commissions increase our expenses and inflate our costs. However, since we have become so used to this system, we no longer question it. We ignore privacy issues, middlemen’s fees, the potential misuse of our data, and even the fact that our money is being held by private entities such as banks, payment wallet providers, and credit card companies — most of which are privately owned.

We trust them with our digital money, yet if we use physical cash, it proves to be inconvenient, unsafe, and difficult to handle. Despite these issues, we rarely question the system, simply because we have no alternative. We have accepted the system and stopped challenging its flaws.

Predominantly, we face four major issues with the current financial system:

1. Middlemen fees,

2. Security concerns,

3. Misuse and loss of privacy due to data sharing, and

4. Excessive dependence on the banking system.

Even today, around two billion people on this planet remain unbanked — unable to access the services of banks. All these systems rely heavily on the presence and functioning of banks and bank accounts. We also cannot rely entirely on physical money because of the difficulties in handling, moving, and safeguarding cash. While cash eliminates the role of middlemen, it introduces its own set of problems related to practicality and security.

Overall, we have ignored these issues in the current system and have stopped questioning the challenges it presents. This is the rationale — the fundamental reason — behind the development of cryptocurrencies.

Blockchain technology enabled the creation of a new form of digital currency that is mathematical in nature and independent of political establishments. It is a mathematics-based currency — a concept that is fundamentally different from traditional money.

This new system potentially solves many of the problems that exist in the current financial framework. Understanding this rationale is essential to grasp why cryptocurrencies and blockchain technology came into existence.

Cryptocurrencies, by their very nature, are decentralized. Because of this decentralized form of digital currency, there is no need for a middleman.

It is a mathematical, arithmetic, and mathematics-based currency. Computers can handle it, mathematical functions can process it, and algorithms can manage it — all designed in such a way that they cannot be tampered with. No one can normally alter, manipulate, or erase these transactions.

The need for middlemen, such as trustees, private intermediaries, or even state players, is completely eliminated by cryptocurrencies.

Secondly, cryptocurrencies are digital in form. Therefore, problems related to tangibility — such as handling, physical movement, and safekeeping of currency — do not arise. These are virtual currencies based on mathematical functions and further supported by blockchain and cryptography. This is why they are called cryptocurrencies.

Being digital in nature, they avoid all the problems associated with physical cash.

Accessibility is also not an issue because the entire cryptocurrency ecosystem is independent of the traditional banking system. It bypasses banks, private intermediaries, and any form of central authority. As a result, even those who are unbanked are not excluded from this ecosystem.

Anyone with access to the internet — through a desktop, mobile phone, or tablet — can participate. Any internet-enabled device can be used to create accounts on crypto exchanges or within any other blockchain-based ecosystem offering digital currency solutions. Hence, the question of accessibility does not arise.

Cryptocurrencies are also highly secure. The privacy and personal data of users are, in the ideal form, completely protected. Even in the current form, this data is not accessible to private players.

In many countries, local governments have intervened and introduced regulations for cryptocurrencies. While some data is shared with authorities due to mandatory compliance requirements, private entities still cannot interfere with the core blockchain ecosystem.

Thus, user data remains highly secure. Despite certain regulatory interventions by governments, private interests are still kept at bay.

To that extent, cryptocurrencies are very safe even in their current form — and in their ideal form, they are undoubtedly much more secure.

When we talk about blockchain and cryptocurrencies, we cannot avoid talking about Bitcoin. If Bitcoin had not existed and had not become such a successful cryptocurrency, this entire technology might have been missed by humanity. People would not have truly recognized the potential of this revolutionary internet-based digital technology.

Even today, despite the fact that Bitcoin was introduced in 2009 — almost sixteen years ago — it remains the most popular cryptocurrency based on blockchain technology. There are now hundreds of other cryptocurrencies that have entered the market after Bitcoin, but Bitcoin still holds more than 50% of the total crypto market share.

In 2008, an anonymous person named Satoshi Nakamoto announced the creation of the world’s first cryptocurrency — a currency based on mathematical functions, foolproof methods, algorithms, advanced computer systems, and internet technology. All these enablers together brought forth this new innovation, which he described as the next wave of international digital currency, called cryptocurrency.

At the time of its inception, the price of Bitcoin was almost negligible. Even in 2009, the price of one Bitcoin was just a few cents. For example, at one point, 10,000 Bitcoins were worth approximately $40 in 2009.

However, the rise of this currency has been extraordinary. The current price of Bitcoin has already surpassed USD 60,000 per Bitcoin — an unprecedented increase in the entire history of humanity. This rise demonstrates how popular and practical this currency has become in the global market.

The total number of Bitcoins in circulation, according to the blockchain-based cryptocurrency ecosystem and protocol created by Satoshi Nakamoto, is currently less than 20 million. This is a relatively small number considering the extensive use of cryptocurrencies in business and trade.

Because of this limited availability, combined with growing demand and increasing acceptance among sections of society, the price of Bitcoin has surged to around USD 60,000 for one Bitcoin.

The success of this cryptocurrency — Bitcoin — has demonstrated the power and practicality of blockchain technology more effectively than any other example. Bitcoin remains the world’s most popular cryptocurrency and the foundation upon which the entire blockchain revolution was built.

People, societies, and companies around the world are now extremely excited about the prospects of this technology being used in various social and commercial applications — ranging from smart contracts, land records, elections and e-voting, financial products, international trade and commerce, to fast and cheaper international money transfers, among many other innovative uses.

On the other hand, these emerging technologies have also gained a bad reputation for being used by criminals, drug traffickers, and terrorists around the world for money transfers. Some applications have been accused of contributing to global warming (especially cryptocurrency mining operations), causing governments to lose tax revenue, and enabling the bypassing of local government regulations in foreign money dealings.

In spite of all these accusations, more and more governments are becoming ready to adopt blockchain technologies and their applications, and are formulating national and international policies for their use.

Now, if we talk about another very important issue related to blockchain technology and cryptocurrencies — which are part and parcel of this technology and together are popularly known as cryptos — it is important to understand their interdependence.

What I mean is that the blockchain ecosystem inherently requires the use of cryptocurrencies. They are a crucial element for implementing effective blockchain-based solutions. Cryptocurrencies are often necessary for the economic and financial aspects of such systems, as demonstrated in the case of the United Nations World Food Programme (WFP), where one of the major benefits was the ability to transfer funds to local Jordanian authorities using cryptocurrencies.

Similar uses of cryptocurrencies are therefore extremely important. However, at the same time, the use of cryptocurrency also brings about significant debate on the ethics and legitimacy of digital currency, as well as the potential for its misuse. Unscrupulous elements — including international criminal networks, terrorists, and those involved in illegal trade — can exploit blockchain-based digital currencies for unlawful transactions.

The very nature of cryptocurrency provides a great deal of freedom to its users, which unfortunately also extends to those engaged in underground or criminal activities. This association has led to a certain level of public distrust. Many people believe that cryptocurrency and blockchain technology are part of a digital scam, mainly because the money and transactions are entirely virtual and invisible.

While not everyone shares this opinion, a section of society feels that the entire concept of crypto is a bubble that could burst at any time. Another important concern is the high volatility of cryptocurrencies — particularly Bitcoin — where prices fluctuate dramatically due to skewed demand and supply dynamics. These extreme variations and the constant media coverage of Bitcoin’s rise and fall have contributed to skepticism among certain segments of the public.

In short, public opinion about blockchain and cryptocurrencies is highly mixed. The issues surrounding their use highlight the need for greater public understanding and awareness of this technology.

As demonstrated by the United Nations World Food Programme, real-world applications of blockchain and cryptocurrencies can bring significant social benefits. These technologies have the potential to improve lives, reduce poverty, bridge the rich-poor divide, promote equality, and ensure fair distribution of global resources.

If more such successful examples and applications can be showcased to the public, people will be more willing to accept and trust this technology. Those who already understand both its advantages and its drawbacks generally hold a favorable view of cryptocurrencies.

The main problem, however, is that most of the public still lacks a deep understanding of cryptos and their true potential. This limited awareness has been one of the major barriers preventing society from fully harnessing the transformative power of blockchain technology.

Friends, now that we have already discussed what Bitcoin is, what blockchain is, the role of miners, how Bitcoin mining is done, and what the verification process is, we now have some understanding of the concept — the foundational software that underpins this entire system of mathematical cryptography and the overall concept of blockchain.

At this point, it is pertinent to understand the philosophy behind this entire concept, which was introduced by an anonymous person known as Satoshi Nakamoto.

Who is Satoshi Nakamoto? Nobody knows. But what was in his mind, and why did he bring this concept to the world by creating the first commercial cryptocurrency — one so perfect in design that it revolutionized the international monetary system?

Bitcoin became the world’s first mathematical cryptocurrency and inspired the creation of many others based on similar mathematical principles — something that had never happened before in human history.

So, who exactly was Satoshi Nakamoto, and what was his philosophy in bringing this concept to life?

Experts have long debated the origins of blockchain and Bitcoin. Many agree that one of the key reasons this concept came to fruition was the presence of certain technological enablers in the digital space at that time. The necessary technologies already existed, and the ideas had been discussed even before Satoshi Nakamoto. There were research papers on cryptography and cryptocurrencies, but no one had yet created a practical solution — someone needed to actually make it happen.

Satoshi Nakamoto did exactly that. He had all the required tools in place and the vision to create something new, innovative, and full of future potential. This likely motivated him to develop the concept of Bitcoin, cryptocurrency, and blockchain.

Researchers who have studied this mysterious figure — his earlier writings and published articles — suggest that Satoshi Nakamoto was likely not Japanese, despite the name. Several studies indicate that he may have been British. However, his nationality is not the most important detail.

What many researchers agree on is that Satoshi Nakamoto was deeply disturbed by the global economic meltdown of 2008. Based on his writings, it appears that he blamed the major banks for mismanaging the international financial system, which led to the crisis. As a result, innocent taxpayers around the world had to bear the cost of the failures of central banks, financial intermediaries, and government monetary authorities.

He was unhappy with this situation and wanted to create something entirely different — something digital, virtual, and technology-driven, managed by computers through a network of decentralized nodes rather than centralized authorities.

His vision was for a decentralized monetary system, which he ultimately introduced in the form of Bitcoin, built on blockchain technology. He documented his ideas in a research paper and shared his solution with the world, all while keeping his identity anonymous.

Researchers strongly believe that Satoshi Nakamoto’s main philosophy was to eliminate the role of intermediaries and central authorities, who were largely responsible for the 2008 global economic crisis.

Using the technological advancements and digital enablers available at the time, he created a decentralized, unregulated monetary system based on digital cryptocurrency — an alternative to the traditional banking system, which had repeatedly failed due to its own mismanagement and greed.

This, in essence, forms the Bitcoin philosophy — the mindset and vision of the person who originated Bitcoin in 2008. His thoughts and innovations gave birth to one of the most remarkable technological breakthroughs since the advent of the internet.

Through this understanding, we get a glimpse into the philosophy behind Bitcoin and the remarkable mind of its mysterious creator.

Bitcoin economics emerges from the same idea, the same philosophy, and the historical background of the economics of currency, the eras of currencies that we already know. In ancient times, we had commodity-based currencies, where gold, silver, spices, and several rare commodities were used as both international and domestic currencies. There was a time when even some spices were used as currency, and, of course, rare metals were widely accepted as well.

The second era in the history of currencies was the era of politically based currencies — the so-called dollar economy — which operates on the concept of free-floating currencies in a massive and dynamic foreign exchange market, valued at over 5 trillion dollars per day. It is a very large and dominant system that still governs global finance today.

Even now, the entire volume of cryptocurrencies is just a tiny fraction of this politically based currency system, which continues to be the main financial framework of the world. We are still living in the dollar economy and in a system of free-floating currencies that has been around for decades. However, we now stand at the cusp of a new era — the mathematics-based era of currency, known as cryptocurrencies.

We are talking about Bitcoin, Ethereum, Litecoin, and hundreds of other cryptocurrencies in the market today. Some have achieved remarkable success, while others have failed to survive. Yet, these mathematics-based currencies are very much in use. Many large organizations have adopted them, and several banks have accepted the concept of mathematically derived currencies. They are being used commercially, and the prices of some of these digital currencies have skyrocketed.

Looking toward the future — the future of economics, monetary systems, and world currencies — it is clear that the era of mathematical and mathematics-based currencies will continue for a reasonably long time. The share and influence of cryptocurrencies will undoubtedly increase.

Along with them, blockchain and blockchain-based solutions, which are integral parts of the cryptocurrency ecosystem, will also continue to play a major role. The current and next few generations will likely witness an even greater presence and importance of mathematics-based currencies in the global financial system.

In the long-term future, we may even enter the age of intergalactic currencies. We cannot yet predict what form currency will take in such a “Star Trek” era, but new and more sophisticated modes of exchange will likely emerge — again based on mathematics and flawless digital systems similar to modern cryptocurrencies.

Currently, most cryptocurrencies operate through a proof-of-work mechanism, which consumes enormous amounts of energy, raising sustainability and climate concerns. In the future, new forms of digital currencies may be developed that follow similar principles but eliminate the high energy consumption associated with proof-of-work, making them more efficient and environmentally sustainable.

We are already living in a multibillion-dollar cryptocurrency economy that has become a reality in today’s international business and foreign trade. As demonstrated by the United Nations World Food Programme (WFP) case study, organizations are already benefiting from these new concepts and innovations.

This entire system of mathematical-based currencies — the result of humanity’s long historical journey through different eras of currency — forms what we now call Bitcoin economics. It is highly dynamic in nature and has led to remarkable phenomena, such as the price of Bitcoin exceeding $60,000 per coin — something unimaginable in 2008 or even just a few years ago.

These developments are clear indicators of what lies ahead. The trends and facts we see today — once unthinkable and unbelievable — point toward the continuing evolution of currency and economics in the digital age. This is the essence of Bitcoin economics.

Let us try to understand how this system actually works from the user’s point of view.

Being a digital currency based on blockchain, any operation connected with blockchain appears somewhat similar to internet banking or digital banking, which we are already familiar with. The user interface for blockchain-based products, including cryptocurrencies, looks quite similar to online banking or credit card transaction systems. However, these transactions are carried out on specific platforms.

For example, if you are dealing with smart contracts, you may use the Ethereum platform. If you want to carry out Bitcoin transactions, you must go to a Bitcoin exchange such as Coinbase. There are several Bitcoin exchanges where the interface closely resembles that of internet banking. This is the first important aspect of how the system appears operationally from a user’s perspective.

However, there is a major difference. In internet banking, you log in using a username and password. Here, instead, you are given a long, garbled address that serves as your identity. This address, along with a corresponding password, is not something you create — it is generated by the system itself and is known as a private key.

This private key is generated automatically when you create your account, and your username is derived from it. Even if you lose your username, you can regenerate it — a long string of random characters — using the private key. This is a key difference from standard digital banking.

The private key serves as your password and is also used to create your address through a mathematical function. Importantly, this entire system is not linked to any private database or banking database. The cryptocurrency system does not rely on any database that is accessible to private organizations.

All transactions in this ecosystem are anonymous. The usernames — represented by strings of characters — are publicly visible in the blockchain, which exists across thousands of computers worldwide. While the public address is visible, the private key is known only to the owner, ensuring anonymity by design.

Ideally, the person holding the username and private key remains completely anonymous, with no identifiable personal information attached. However, in recent times, due to local government regulations, the actual user identity is recorded in government databases. This allows authorities to maintain some level of oversight and control over activities conducted through the system to prevent illegal use.

Other than that, the system itself does not maintain any database linking usernames or private keys to real-world identities. There are no cards, credit card fees, or banking fees involved in the process.

Instead, there is a nominal mining fee, which is fixed and independent of the transaction amount. This is different from traditional systems, where bank or credit card fees are linked to the size of the transaction. The mining fee in blockchain transactions may vary slightly depending on demand and network activity — if there are many users or high demand at a given time, the fee may be slightly higher. However, overall, these fees are minimal compared to traditional banking or credit card charges.

For small transactions, however, the mining fee can sometimes appear significant depending on the timing and network conditions.

Another important aspect of cryptocurrencies, particularly Bitcoin, is their volatility. Bitcoin’s price changes every second — even fractions of a second — making it a relatively risky currency in the market. This volatility is quite different from what we experience in regular digital banking, where local currencies remain stable.

In conventional systems, local transactions are unaffected by international exchange rate fluctuations. Although fiat currencies can experience some volatility in international trade, it is nowhere near the level of fluctuation seen in Bitcoin prices.

This high volatility is one of the most distinguishing features of the Bitcoin system and sets it apart from traditional forms of digital or fiat currency transactions.

Now, if we look at the interface of any particular Bitcoin exchange — for example, in this case — and if you want to send or receive money, you will notice that the process is quite straightforward. As I have already mentioned, you may not actually know who the recipient is. You usually only have the user ID of the person, which is a mathematical function of their private key.

This user ID is what you use to send money. You transfer funds to this user ID without knowing the actual identity of the person who owns it. This makes the ecosystem quite different from conventional systems.

When you initiate a transfer, the transaction is usually completed instantly, with no noticeable delay. However, if the mining activity is high and the system is congested, the transaction may take a bit of time for confirmation.

For instance, when you send Bitcoin to someone, you will see the recipient’s user ID — a long string of random characters — and you must enter it accurately. You will also specify the amount of Bitcoin to be sent. In some cases, the transaction fee may be zero.

In this example, the Bitcoin exchange used is Coinbase, which has not charged any transaction fee. However, there is a network fee, also known as the mining fee, which fluctuates depending on the network’s demand and supply conditions. This fee is not dependent on the amount of the transaction.

At this particular point, the network fee is approximately $0.23, which is minimal, while the total amount sent is equivalent to $56 in Bitcoin. After submitting the details, you receive a confirmation ID for your transaction. As you can see, in this example, the transaction is completed free of charge apart from the small network fee.

This is how the Bitcoin money transfer system works. The idea here is to give you a visual understanding of how the user interface appears when you send cryptocurrency — in this case, Bitcoin.

Another important aspect is that even the recipient may not know your actual identity. The recipient only sees that the money has come from a particular Bitcoin address. The funds, stored in the form of Bitcoin, remain safe, secure, and anonymous — at least theoretically — in the sense that no private individual or organization can access the details.

However, in practice, government regulations have altered this anonymity. Many state authorities maintain databases of the actual owners of user IDs for monitoring and compliance purposes.

If you are not transferring money but instead buying or selling Bitcoin, you can do this through an exchange such as Coinbase. You can deposit fiat currency (like USD, GBP, or INR) into your wallet and use it to purchase Bitcoin or other cryptocurrencies.

The process is similar to sending money. On the exchange interface, you will find options for buying and selling within your wallet. The dashboard allows you to choose the cryptocurrency — Bitcoin, Ethereum, or others — that you wish to buy or sell.

You will also find the available payment methods, which may include credit cards, debit cards, or internet banking, since you are using fiat currency to purchase cryptocurrency. The interface displays the exchange rate and allows you to enter the desired purchase amount.

For example, in one instance, 100 British pounds were converted into an equivalent amount of Bitcoin. This interface lets you carry out your buying or selling operations easily using your chosen payment method.

Once you have Bitcoin in your wallet, you can transact anywhere in the world without needing a bank account or credit card. Bitcoin transactions are completely independent of traditional banking systems.

However, to enter the Bitcoin ecosystem, you must either buy, sell, or mine Bitcoins. These are the only ways to acquire Bitcoins and participate in Bitcoin transactions.

Now, if you are not sending money, you are simply putting your fiat currency into a wallet and buying or selling cryptocurrency. In this case, let us take the example of buying and selling Bitcoin on Coinbase, which is a Bitcoin exchange. You can buy and deposit Bitcoins into your wallet.

If you want to fill your wallet with Bitcoin, you can use your fiat currency on the Bitcoin exchange to buy or sell. It is very similar to sending money. Here, you have an interface that allows you to choose between buying and selling within your wallet.

This is the dashboard you will see, and it provides options to select your preferred cryptocurrency — it can be Bitcoin, Ethereum, or another cryptocurrency. These exchanges offer a variety of digital currency choices that you can buy or sell.

You will also find your payment method options, which may include a credit card, net banking, or another method, since you are buying cryptocurrency using your fiat currency.

You can enter the desired amount, and in some cases, there are weekly credit card limits. For example, in this case, 100 GBP has been converted into the equivalent Bitcoin amount. The interface displays the current Bitcoin rate.

With this kind of interface, you can easily carry out your buying or selling operations using your credit card or bank account. Once you have Bitcoin in your wallet, you can transact it anywhere in the world, without any link to a bank account or credit card.

Bitcoin transactions are completely independent of credit cards or banking accounts.

However, to enter the Bitcoin ecosystem, you must either buy or sell Bitcoins or mine them. These are the only ways to enter the Bitcoin space, own Bitcoins, and carry out Bitcoin transactions.

Since the industrial revolution, information and communication technology has advanced like a phenomenon never seen in the history of humans. Among many new technologies which have emerged recently and which have affected immensely to humans and society at large are – internet, cloud computing, data sciences, and more recently one technology that has been of much talk around the world is Block chain and its system technology called Crypto currency. Marc Andreessen, a famous venture capitalist said block chain was the most important invention since the internet and many market analysts believe that crypto currencies will revolutionize the way money and managed and transferred worldwide. Most importantly increasingly this new technology is finding more and more acceptance as part of one of the most important component of modern tech business strategy companies worldwide looking at for adoption

Now, friends, let us try to understand what Bitcoin is.

This is only an example, but when we talk about what Bitcoin is and how it works, you will get a fairly good idea about the application of blockchain — how it functions, what role blockchain plays in creating cryptocurrencies, and many of its other uses.

In this discussion about Bitcoin, you will also understand how different cryptocurrencies are created using cryptography and blockchain technology. Most cryptocurrencies are developed and function in a way very similar to Bitcoin.

The most important foundation of Bitcoin is the Bitcoin blockchain. This is crucial to understand.

Blockchain is essentially a widely shared list of every Bitcoin transaction that has ever taken place since its inception in 2008–2009. Every second, every fraction of a second, all Bitcoin transactions happening anywhere in the world are recorded in a very large chain of digital blocks — known as the blockchain.

This Bitcoin blockchain forms the very basis of Bitcoin.

Bitcoin, as a cryptocurrency, is a mathematical, digital, and virtual currency controlled by thousands of computers and servers hosting the latest Bitcoin blockchain. There is no single middleman or private interest managing it.

Interestingly, Bitcoin functions like an artificial intelligence-controlled currency — but instead of AI, it is governed by mathematical functions. These mathematical algorithms control the Bitcoin system and manage all monetary transactions.

There is no single authority, no centralized database, and no middleman involved. As a result, there are no intermediary costs, no commissions, and no conversion charges. It also eliminates the risk of private data misuse or unauthorized sharing of user information.

All transactions — whether sending, receiving, buying, or selling — take place peer-to-peer. This means the exchange is directly between two parties, without any third-party involvement. This peer-to-peer nature is one of Bitcoin’s most remarkable features.

When you send money to another Bitcoin user, both users remain anonymous. You only have the recipient’s user ID — a long, garbled string of characters that serves as an address. As long as this address is accurate, you can transfer Bitcoin directly without knowing the other person’s identity.

Another important aspect of Bitcoin is that transaction verification and authenticity are not handled by a single authority or middleman. Instead, transactions are verified through crowd unanimity.

The Bitcoin blockchain is hosted by thousands of servers around the world, and these servers — or “nodes” — collectively verify and agree that a transaction has taken place. This collective consensus, not a single institution, certifies the validity of each transaction.

Each transaction — whether buying, selling, or transferring Bitcoin — is approved by this global network of nodes. The unanimity among them ensures trust without needing a central authority.

Interestingly, this concept is similar to ancient methods of trade in early civilizations. In some tribal societies, for instance, large stones were used as a medium of exchange. Everyone in the community knew who owned which stone, and when ownership changed, the entire group acknowledged it collectively — without a central authority.

This ancient idea of collective acknowledgment or unanimous consent has been replicated in the digital age through blockchain technology. It is fascinating how humanity has come full circle — from trading with gold, spices, and stones to transacting with mathematical currencies using global technology.

In Bitcoin, there is no single trustee, no middleman, and no central approval authority, unlike traditional bank transactions. Instead, Bitcoin operates as a multi-entry ledger shared among a massive network of computer nodes distributed across the world. These nodes run 24/7, 365 days a year.

The records in the Bitcoin blockchain are tamper-proof. The system is designed so that information cannot be altered or manipulated. Each digital block in the chain is mathematically linked to the others. If anyone tries to change information on one node, it is immediately detected by the system. The manipulated list is rejected by the majority, ensuring the integrity of the blockchain.

This mathematical interdependence — maintained through cryptographic hashes and algorithms — guarantees the immutability of the data.

It is an extraordinary concept — the result of numerous technological enablers such as the internet, advanced computing power, mathematics, and processor capabilities. All these innovations have converged to create the blockchain ecosystem, giving rise to the world’s first mathematical currency — Bitcoin.

The idea behind it is simple yet profound. Ancient in spirit, modern in execution, and global in scope, it represents a monumental technological leap for humanity.

At this stage, we already have a clear understanding of what Bitcoin is, how it works, and what its key features and foundations are. Now it is time to move forward and understand what blockchain itself is.

Now, friends, let us try to understand what Bitcoin is.

This is only an example, but when we talk about what Bitcoin is and how it works, you will get a fairly good idea about the application of blockchain — how it functions, the role of blockchain in creating cryptocurrencies, and its many other uses.

In this discussion about Bitcoin, you will also understand how different cryptocurrencies are created using cryptography and blockchain technology. Most cryptocurrencies are developed and function in a way very similar to Bitcoin.

The most important foundation of Bitcoin is the Bitcoin blockchain. That is the key element.

What is a blockchain? It is a widely shared list of every Bitcoin transaction that has ever taken place since its inception in 2008–2009. Every second, every fraction of a second, whatever transactions are taking place anywhere in the world are recorded in this massive chain of digital blocks, called the blockchain.

This Bitcoin blockchain forms the very basis of Bitcoin.

Bitcoin, as a cryptocurrency, is a mathematical currency that exists digitally and virtually. It is controlled by thousands of computers and servers that host the latest version of the Bitcoin blockchain. There is no single middleman or private interest involved in this currency.

Interestingly, Bitcoin works like an artificial intelligence-controlled currency — except that, in this case, the “intelligence” is purely mathematical. These mathematical functions and algorithms control the Bitcoin system, which operates automatically on computers around the world. The Bitcoin software governs the transactions and the entire operation of monetary exchanges conducted in Bitcoin.

There is no single authority, no centralized database, and no middleman. Because of this, there are no intermediary costs, no commissions, and no conversion charges. The system also eliminates the risk of private data misuse or unauthorized sharing of user information.

All transactions — sending, receiving, buying, or selling — occur peer to peer. This means that the transfer of Bitcoin happens directly between two users without any third party. That is the beauty of the Bitcoin concept.

You can send Bitcoin to another user who is also anonymous. You only need the recipient’s user ID, which is a long string of random characters. As long as the address is correct, the transfer is completed, even though you may not know who the person is.

Another key aspect of Bitcoin is that transaction verification and authenticity are not handled by any central authority or middleman. Instead, Bitcoin transactions are verified through crowd unanimity.

As mentioned earlier, the Bitcoin blockchain is hosted by thousands of servers located across the world. The people or nodes hosting the longest and most up-to-date blockchain collectively and unanimously agree when a transaction has occurred. This system functions without any middleman or centralized control.

A large number of these “trustees” — the computers that maintain the global blockchain — confirm the existence of the transaction and the transfer of ownership. Every transaction, whether buying, selling, sending, or receiving, is validated not by a single entity but by the collective agreement of thousands of network nodes. This phenomenon of crowd consensus is what ensures trust and accuracy in the system.

This is a fascinating concept, and it reminds us of several ancient methods of trade used by early civilizations. Many tribes, for example, used large stones as a medium of exchange. Everyone in the village knew who owned which stone, and ownership changes were acknowledged collectively. There was no central authority — the entire community recognized the transfer.

The same ancient idea has been applied here through digital technology. Humanity has come full circle — from using stones, metals, and spices as commodities of exchange to now using mathematical currencies powered by global technology.

Another feature of Bitcoin is that there is no single trustee, middleman, or certifying authority, unlike in banking systems, where a single entry in the ledger is controlled by a centralized authority.

Bitcoin transactions are multi-entry records shared across a massive distributed network of computer nodes located all over the world. These nodes operate continuously — 24/7, 365 days a year.

The transaction records stored in the blockchain are tamper-proof. The system is designed in such a way that information cannot be manipulated. Each digital block in the chain is mathematically dependent on the previous one. If any node attempts to alter information, the discrepancy is immediately detected, and the manipulated record is rejected by the network.

The blockchain remains clean and consistent because the majority of nodes always hold an uncompromised version of the data. The mathematical structure — through cryptographic hashes and linked algorithms — ensures the integrity of every block in the chain.

This makes the entire system virtually impossible to tamper with.

It is truly an amazing concept — a result of many technological advancements such as the internet, computing power, mathematics, and processor capabilities. All these innovations have converged to create the blockchain ecosystem, which enabled the world’s first mathematical currency — Bitcoin.

The idea itself is ancient, yet profoundly simple. What was once a basic principle of human trade has now been implemented globally through cutting-edge technology.

At this stage, we already know what Bitcoin is, how it works, and what its features and foundations are. Now it is time to move ahead and understand what blockchain is.

Now, let us look at the verification process — how this verification is carried out.

The so-called decentralized verification or consensus-based verification is the result of the networked and communicable information sharing that happens across the blockchain throughout the planet.

As mentioned earlier, there is no central or single authority to verify a transaction. Then how is it done?

The important players in this verification process are the people referred to as professional verifiers. They perform this task with the expectation of receiving a reward — it is their profession. These professional verifiers are known as Bitcoin miners.

In common terms, this process is called Bitcoin mining. This mining operation represents the role of professional verifiers who confirm transactions in the blockchain system.

The beauty of this system lies in the fact that those who mine Bitcoin — in their pursuit of earning Bitcoin as a reward — also serve as professional verifiers of the transactions. In the process, they are compensated for their efforts.

They are called miners because they are rewarded for their work, much like miners extracting valuable resources. Their reward is in the form of a fixed Bitcoin-based income for each verified block of transactions. This process is known as Bitcoin mining.

In the recent past, particularly during the COVID-19 pandemic, global crude oil prices fell drastically. As a result, the cost of energy required for Bitcoin mining operations dropped significantly, making mining far cheaper. Meanwhile, Bitcoin prices were skyrocketing.

This combination of low energy costs and high Bitcoin prices led to a massive increase in Bitcoin mining activity. Many miners earned substantial rewards during that period, benefiting from reduced operating costs and the rising value of Bitcoin.

In the following sections, we will explore in detail how mining operations are conducted and how this verification process actually takes place. Step by step, we will examine the various aspects related to Bitcoin mining and the verification mechanism.

An important concept in understanding Bitcoin mining is that of digital blocks, which together form the giant shared ledger known as the blockchain.

These digital blocks act as containers of transaction data that are recorded in real time. Bitcoin miners verify these groups of transaction records, known as Bitcoin blocks or cryptocurrency blocks.

Each block contains a fixed number of transactions — usually between 1,500 to 2,000 entries, depending on the size of the information. Miners are responsible for verifying these blocks in batches.

The reward for completing the verification of a block is a fixed number of Bitcoins per block. However, this reward is designed to be halved every four years.

This is an interesting and important feature of the Bitcoin system. You will understand its purpose and significance more clearly once the entire concept of Bitcoin, blockchain, and mining becomes clear.

Currently, the block reward is 6.25 Bitcoins per verified block, which was halved from the previous reward just last year during the scheduled four-year reduction.

So far, we have gained an understanding of how the verification process works. Gradually, as we continue to explore, the overall concept will become clearer.

It is natural to feel some confusion at this stage, but once you fully grasp the idea, everything will start to make perfect sense.

To understand it better, we now need to look at the role of the miners — what exactly they do in this process.

The role of miners is to attach new blocks to the blockchain, making it longer and increasing the file size of the blockchain. For example, the Bitcoin blockchain is already several gigabytes in size. The main role of the miner is to add new blocks, and this addition of new blocks is their primary function.

The second important aspect is cryptography, which is why this whole concept is called cryptocurrency. The blockchain is based on mathematical functions derived from cryptography.

In cryptography — which forms the foundation of blockchain — each block, whether old or new, is linked to all other blocks through a cryptographic mathematical function. Every new block is connected to all previous blocks in such a way that once verified, it cannot be separated from them.

Any change or manipulation in earlier blocks is impossible because of this dependency. If an earlier block is altered, the subsequent blocks become compromised, making it very easy to detect any tampering with records. Each block is mathematically tied to the one before it using cryptography. Therefore, the accuracy of each block depends on the integrity of all preceding blocks.

Every earlier block must remain uncompromised and untampered. This is the beauty and strength of the blockchain concept — the very foundation of its protocol and structure.

The blockchain operates as a contiguous single entity, even though it consists of many interconnected blocks. Each block depends on others, forming a continuous and secure digital chain.

One could compare this interconnection to the universe itself — everything being linked in some form. Just as human actions on this planet can directly or indirectly affect others, every block in the blockchain has an impact on the rest of the chain.

For instance, if someone drives a car and pollutes the environment, the effect, whether minor or major, extends to everyone living on the planet. Similarly, all blocks in a blockchain are connected — mathematically, logically, and inseparably.

The Bitcoin software ensures that every block is connected to all previous blocks, making any manipulation immediately detectable.

Now, this leads to the concept of invalid blocks.

What are invalid blocks? If a new block is not properly linked to the previous blocks — meaning the earlier blocks are tampered with or compromised — the new block automatically becomes invalid.

When accuracy and integrity are not maintained completely, the new block is rejected, and the miner does not receive any reward.

This ensures that all Bitcoin miners maintain an accurate, sanitized, and untampered blockchain. Only miners who possess the latest and most accurate copy of the blockchain can successfully add a valid block and earn a reward.

Another important aspect of this process is the concept of Proof of Work (PoW).

What is Proof of Work? It means that miners must not only provide a valid block but also demonstrate significant computational effort — or “proof” — to earn the reward. Having a valid block alone is not sufficient. The miner must show proof of substantial work done to validate it.

The purpose of this mechanism is to prevent fraudsters from manipulating block information or adding fake transactions.

The Bitcoin software makes it extremely difficult for anyone to add fraudulent blocks. Thousands of miners compete simultaneously to add new blocks, but only a few succeed.

Through countless iterations of attempting to add valid blocks, only a handful of miners manage to succeed. Even though many blocks may be valid, the process requires continuous effort and repeated attempts. This demanding and competitive process is what constitutes Proof of Work.

The idea behind Proof of Work is to make the system secure by ensuring that adding new blocks requires effort, computation, and time — making it prohibitively difficult for fraudsters to manipulate data.

Another concept in blockchain mining is that of the official chain of blocks.

What is the official chain of blocks? It refers to the longest verified chain — the version that contains the latest block and all previously verified, uncompromised blocks.

This longest, verified chain is considered the official record of all digital transactions that have taken place in a cryptocurrency network, such as Bitcoin.

Therefore, the longest chain rule applies — the chain with the most verified blocks, the latest additions, and the cleanest data is recognized as the official blockchain. Every miner strives to contribute to this chain by adding new blocks to it.

Now, let us look at the role of the Bitcoin software in these mining operations.

I have just mentioned that this complex process of adding blocks — valid and invalid blocks — along with the mathematical dependence of each block on the others, the cryptography, the proof of work, and the prevention of fraud, is all managed by the Bitcoin software.

The Bitcoin software is the key component that controls this entire system. It functions almost like an artificial intelligence entity, constantly monitoring what is happening — how many miners are active, how many blocks are being added, and whether the speed of block addition is appropriate.

The software ensures that the timing of block addition remains balanced — not too fast and not too slow. The Bitcoin blockchain software currently maintains an average interval of about ten minutes between the verification of one block and the next. This interval is known as block time.

This results in a steady and continuous flow of newly verified blocks being added to the blockchain.

Since millions of miners are constantly joining and leaving the network, each with varying computing power, the total number of guesses for the “magic number” — a key element in mining — changes continuously.

As explained earlier, even if a block is valid, miners must correctly guess a specific magic number before they can be rewarded. This guessing process involves highly complex mathematical operations carried out by computer processors working around the clock.

The Bitcoin software manages this process by ensuring that the average time to guess the correct number remains around ten minutes.

For example, if there is a sudden surge in the number of miners — which increases the likelihood of the magic number being guessed too quickly — the software automatically increases the level of difficulty, making it harder to find the correct number. This ensures that the next block is not verified before ten minutes have passed.

The magic number, or the number of hashes (guesses per second), keeps changing constantly, and managing this adjustment is one of the main roles of the Bitcoin software.

The software’s goal is to maintain a consistent pace of block additions — ensuring the process is neither too fast nor too slow — so that the system remains stable and continuous.

It constantly adjusts the difficulty level for guessing the correct hashes, ensuring that, on average, one block is added every ten minutes. Each time a block is added, the block reward is released, increasing the total number of Bitcoins in circulation.

Currently, the reward for each verified block is 6.25 Bitcoins, meaning that approximately every ten minutes, 6.25 new Bitcoins are added to the system.

Hi there!

I hope you are doing well and making great progress in this course.

I wanted to take a moment to congratulate you on your remarkable progress. Your dedication and commitment to learning have truly impressed me.

I have been following your journey closely, and I must say, I am delighted with the efforts you are putting in. As a token of appreciation for your hard work, I would like to offer you a complimentary copy of my recent book on a similar topic to the one you are studying in this course. I believe it will further strengthen your understanding and enhance your grasp of the subject.

You can download the PDF copy of this book from the Resources Section of this lecture.

This course is part of the VJ Export Mastery Courses Series, a collection of 25 different courses focused on export management, designed to equip you with the knowledge and skills needed to excel in the field of exports and international trade.

On my part, I am committed to helping you expand your learning journey by providing access to more courses in the series. On your part, I have a small request as well.

Your feedback is incredibly valuable in refining this course and ensuring it remains world-class. I kindly ask you to leave a rating and your honest feedback for the course if you have not yet done so. Your input will help me continue improving and tailoring the course to meet your needs and those of future learners.

Thank you once again for your dedication and enthusiasm.

Keep up the fantastic work you are doing, and remember, I am here to support you every step of the way.

Together, let’s continue this journey of learning and growth.

Now, I would like to share with you an interesting incident related to Bitcoin. A very popular event took place in 2010 when a Florida man named Laszlo Hanyecz posted on a Bitcoin forum, offering 10,000 Bitcoins in exchange for a pizza. What happened after that is quite amazing to read about.

Friends, we have already discussed several aspects and issues connected with Bitcoin, cryptocurrencies, and blockchain.

Up till now, my idea was that you should be clear about the concept of blockchain — what it can do, what its rationale is, and what a mathematical currency means. You should also understand the difference between cryptocurrency and the normal digital banking system.

I have given you a fairly good idea about the basic concepts of both Bitcoin and blockchain.

Now, I would like to share with you an interesting incident related to Bitcoin. A very popular event took place in 2010 when a Florida man named Laszlo Hanyecz posted on a Bitcoin forum, offering 10,000 Bitcoins in exchange for a pizza. The price of the pizza at that time was around $41. A British man obliged by ordering two large pizzas from Papa John’s and had them delivered to Laszlo’s address, as mentioned in the forum post, in exchange for 10,000 Bitcoins.

It was the first time any real-world transaction actually took place using Bitcoin. The person wanted to demonstrate that Bitcoin could be used for real-life transactions.

Today, that sum is worth approximately $200 million. When this incident was first written about, the price of those 10,000 Bitcoins was around $70 million, but now it has crossed $200 million.

However, even today, there are not many establishments — and none of the popular pizza chains — that would easily accept Bitcoin for delivering pizza. But looking at the current price of one Bitcoin, which is more than $60,000, I think anyone aware of Bitcoin would be happy to accept it as payment if offered in a substantial amount.

This is a very interesting and real incident. The person who gave away 10,000 Bitcoins — if he had kept them — would today have over $200 million worth of Bitcoin. And all of that went for two pizzas!

It is a fascinating and somewhat strange incident. Of course, it was not strange at that time, but in hindsight, it has become one of the most talked-about stories in Bitcoin history. It is also known as the “$70 Million Pizza Incident.”

This story became extremely popular on social media about a year and a half ago, and I wanted to share it with you to illustrate the astounding and unbelievable rise in Bitcoin’s value.

The rise of Bitcoin is both strange and mysterious. The main reason attributed to this unprecedented increase in value — currently around $60,000 per Bitcoin — lies in the simple principle of demand and supply.

There is high demand because many people want to buy Bitcoin for transactions or investment purposes. However, the supply is limited. As I mentioned earlier, the only way new Bitcoins enter circulation is through block rewards, and these rewards are halved every four years.

At present, around 20 million Bitcoins are already in circulation — a small number compared to the growing demand. Over time, the number of new Bitcoins entering the system will continue to decrease.

By 2030, nearly 99% of the total possible Bitcoins, as defined by the Bitcoin algorithm, will already have been mined. Only 1% will remain to be mined until 2140, meaning it will take more than a century to mine the remaining supply.

This imbalance — limited supply and growing demand — continues to drive the soaring price of Bitcoin, which, as mentioned, is already above $60,000 per Bitcoin.

These are some fascinating facts about the world’s most popular cryptocurrency, Bitcoin.

However, let me clarify that the main focus of this course is not cryptocurrency or Bitcoin itself. My main focus here is the e-commerce applications of blockchain technology.

That is what I want to explore in greater detail, especially its connection to international trade, foreign trade, exports, and imports — because, in my view, that is where the best and most practical uses of blockchain technology truly lie.

Now, in the next lecture, I’ll give you an idea about Bitcoin mining operations happening around the world.

Before I talk about some of the very interesting applications of blockchain technology, I’ll give you an idea about Bitcoin mining operations happening around the world.

An important aspect of Bitcoin mining is that solo mining — meaning one person mining for Bitcoin — is highly impractical and unprofitable. Statistically, with the current probability of guessing the hash (the magic number), it would take an average of 57 years to mine just one block worth of Bitcoin rewards.

That means one person could spend their entire lifetime and might only manage to mine one block — if at all — which currently yields 6.25 Bitcoins per block. Clearly, this is not practical.

This is where the concept of mining pools becomes essential. People combine, or “pool,” their computing power to reduce that 57-year duration to something more reasonable, like a week or a month. The more people who join the pool, the faster the process becomes.

In a mining pool, participants share their computational and hash power and split the rewards equally among themselves. The more participants there are, the smaller each person’s individual reward — but the overall chances of successfully mining Bitcoin increase significantly.

However, mining pools still have practical challenges. Each participant uses their own hardware and electricity, both of which can be expensive, even when pooled together.

This led to the introduction of cloud mining in the Bitcoin mining ecosystem. In cloud mining, you do not need to own or maintain mining equipment yourself. Instead, you rent a portion of large mining setups called rigs — collections of specialized computer servers with dedicated hardware built solely for Bitcoin mining.

These rigs are maintained by professional companies, often located in regions with colder climates and cheaper electricity, such as parts of China. The cold weather reduces the need for cooling, and the low electricity costs allow professional miners to make higher profits.

As a result, cloud mining provides better returns on investment.

The success of cloud mining can be measured by the fact that about 80% of the total Bitcoin mining in the world takes place in China, most of it through cloud mining systems.

Other favorable locations for mining include Iceland, where electricity is cheap due to abundant geothermal energy, and where cold weather naturally helps cool the mining equipment.

In these regions, both the cost of electricity and the energy required for cooling the computer processors are significantly lower, making mining far more efficient.

You can see in the image of a mining rig in China that these setups are enormous and equipped with specialized hardware optimized for Bitcoin mining performance.

However, one major concern with Bitcoin mining is its massive electricity consumption.

Research indicates that the amount of energy used in Bitcoin mining operations is not dramatically higher than the energy required for gold mining. In fact, the energy consumed to mine Bitcoin is roughly comparable to that used for extracting an equivalent amount of gold.

Like any other major technological advancement in recent human history, Bitcoin, blockchain, and cryptocurrency also have their dark sides. Let's talk about the dark sides of Bitcoin and Blockchain Technology in the next lecture.

Like any other major technological advancement in recent human history, Bitcoin, blockchain, and cryptocurrency also have their dark sides.

Efforts are being made to reduce the pitfalls and loopholes of these technologies — those inherent weaknesses in Bitcoin, blockchain, and cryptocurrency systems. The basic processes of these technologies have their own challenges, and I will now discuss some of them for your understanding.

The goal is to identify these challenges and minimize their impact on people’s daily lives, on the climate, and on the sustainability of our planet — our shared home.

The first and foremost major loophole of the Bitcoin system is that its blockchain is extremely heavy. As I have mentioned earlier, the blockchain contains all the information since the inception of the currency.

In the case of Bitcoin, which was introduced in 2008, more than 12 years have passed, and millions of transactions have taken place. All this information is stored in the Bitcoin blockchain, making it a massive file — over 200 GB in size.

Such a large file creates major challenges for companies maintaining the full nodes of the blockchain. Only a few companies can afford to maintain full nodes, and this, to some extent, defeats the purpose of crowd unanimity, decentralization, and the concept of a scattered ledger distributed across many computers worldwide.

When only a handful of companies maintain full nodes, the basic purpose of decentralization is compromised.

The second pitfall of blockchain technology, particularly in the case of Bitcoin, is the dominance of a single software. Around 97% of Bitcoin miners use the Bitcoin Core software. This software is developed and maintained by one company that knows the internal workings of the system.

If 97% of miners depend on one company’s software, the purpose of decentralization and independence from central authority is again weakened. A small group of people within that company could potentially control the algorithm, rules, and codes of the Bitcoin network.

Thus, the core philosophy of eliminating middlemen and central authorities is, to some extent, compromised by the widespread dependence on a single software provider.

The third pitfall relates to the monopoly enjoyed by certain companies that dominate computing power. Cloud mining requires very large and expensive mining rigs, which few individuals or small entities can afford. As a result, a handful of large mining companies control most of the computing power and, therefore, mine the majority of Bitcoins.

This concentration of mining power increases the risk of a 51% attack, a theoretical situation in which an entity controlling more than half of the computing power could manipulate data or transactions in the blockchain.

The fourth loophole concerns the monopoly of a few Chinese companies that manufacture the specialized hardware — called ASICs (Application-Specific Integrated Circuits) — used exclusively for Bitcoin mining.

These companies control about 70% to 80% of the global market for this specialized computational hardware. Such dominance by a few companies forms a cartel-like structure, undermining the principle of decentralization and independence that blockchain technology was built upon.

The fifth loophole involves the massive electricity and energy consumption required to operate mining rigs. Bitcoin mining consumes vast amounts of power, which contributes to climate change and raises serious questions about the sustainability of such operations on our planet.

Having said that, these pitfalls and loopholes represent the darker side of blockchain and Bitcoin technology — much like any other great technological advancement. Every technology, whether in transportation, the internet, or medicine, has had its own downsides.

Similarly, blockchain and Bitcoin also have their dark sides, as discussed above.

However, ongoing global efforts aim to mitigate these issues. Continuous innovation and modifications in the concept are expected to help reduce many of these challenges and contain the negative impacts of this otherwise revolutionary technology.

Along with the role of AI in future business, Blockchain, incidentally, is playing a major role in revolutionizing the way global businesses are done. All sectors of global business are likely to see major advancements triggered by the advent of AI and Blockchain. Let's have a peek into these emerging business applications in the next lecture.

Now, to talk about the business applications — which are the most exciting part of blockchain technology — I would like to mention that while cryptocurrencies will be a long-drawn game for local governments to accept, it will take considerable time for them to give up control over the monetary architecture of their countries. It will be a far cry for local governments to truly embrace cryptocurrencies the way they currently manage politically based currencies.

However, other blockchain applications, such as smart contracts and financial products, do not face the same kind of challenges or government reservations. These are not as heavily regulated or politically sensitive as cryptocurrencies, making them much easier to implement and adopt in practical business environments.

This is the most exciting part of blockchain technology — the non-cryptocurrency applications. These use the same foundational concepts but are applied by software developers through blockchain platforms such as Ethereum, enabling the creation of smart contracts, decentralized financial products, and other innovative applications that are gaining immense popularity.

Most blockchain applications are linked in some way to cryptocurrencies like Bitcoin, but it is entirely possible to bypass the cryptocurrency element and focus solely on the technology.

One of the most successful recent applications has been in blockchain finance. Using sophisticated decentralized digital systems and smart contracts, blockchain technology now supports a range of financial products. Examples include asset management, insurance, cross-border payments (international trade and foreign trade), and unconventional money lending models that offer better terms for both lenders and borrowers.

These DeFi (Decentralized Finance) products are becoming extremely popular, with commerce in this area growing every day. It is expected that by 2025, the volume of business in blockchain-based financial products will surpass $500 billion.

Another very exciting business application of blockchain technology is in smart properties. Through Internet of Things (IoT) integration, both tangible and intangible properties can become smart properties.

These properties, once assigned unique digital codes and connected to the internet, can be managed on a blockchain platform as digital assets — capable of being traded, negotiated, and verified virtually. This adds a new level of trust and transparency between parties engaging in property transactions.

This concept of smart properties has immense potential in digital real estate and virtual asset management, making property dealings faster, more secure, and more efficient.

A third and highly promising application lies in IoT-based blockchain systems. In this concept, billions of interconnected devices can communicate and operate in a self-programmed, automated way using blockchain-based algorithms.

For example, in large manufacturing facilities, hundreds or even thousands of machines and parts undergo wear and tear. Managing spare parts manually is expensive and time-consuming. However, if these machines and components are IoT-enabled and connected through blockchain, the system can automatically detect when parts need replacement, alert suppliers through smart contracts, and even initiate shipment of new parts — all without human intervention.

This results in enormous savings in maintenance, inventory, and downtime costs while achieving just-in-time replacement and automated efficiency — a perfect example of how blockchain and IoT can work together for industrial optimization.

Another very important and exciting business application of blockchain is in smart supply chains.

In international trade, supply chains often involve complex movements of goods across borders, by air, sea, or land. Blockchain-based smart supply chain systems use supply chain sensors — digital tags attached to boxes, pallets, or products — to track shipments in real time.

These sensors, integrated with blockchain, enable companies to trace goods anywhere in the world, while blockchain ensures that all information is securely stored, shared, and verified through self-triggering algorithms.

Developers are already creating such blockchain-based supply chain management systems using platforms like Ethereum, providing businesses with real-time visibility, improved transparency, and reduced fraud.

Finally, one of the most transformative applications of blockchain is in smart commerce.

At the foundation of smart commerce lies the smart contract — a digital, self-executing agreement between two parties with no need for intermediaries. These contracts provide faster dispute resolution, reduced transaction costs, and the elimination of third-party dependencies.

Smart contracts are self-triggering — meaning that predefined actions (like payment release or shipment dispatch) are automatically executed once the set conditions are met.

This makes them highly valuable for international trade and particularly beneficial for small and medium enterprises (SMEs). They bring greater trust, reduce commercial risks, and minimize costs associated with delays, human errors, or legal disputes.

Smart commerce, through blockchain-based smart contracts, can truly revolutionize trade transactions by reducing time, cost, uncertainty, and litigation risks.

These contracts function on the IFTTT principle — If This Then That — meaning that once specific pre-agreed conditions are fulfilled, the contract automatically executes its next action on the blockchain.

This is one of the biggest revolutions brought by blockchain technology — a transformation that does not require governmental approval and is already being widely implemented.

The adoption of blockchain for smart contracts in foreign trade is a highly welcome and growing trend, and I will explain these applications in greater detail in the following sections.

What is the role of the ancient Byzantine Generals Problem in computer science? How this ancient war game mystery and an unsolved puzzle, helped the invention of modern time's most disruptive technology, i.e., Blockchain, is explained in simple language.

Hello friends,

Welcome back. In this course, up till now, I have discussed broader topics — I have told you about what Bitcoin mining is, what blockchain is, and some of the very basic concepts. I have also explained what proof of work means and given you some brief details about the verification process and how the block reward is obtained.

However, I have not gone into the deeper technical details. I haven’t yet explained exactly what happens when a Bitcoin miner tries to earn the block reward, which is currently 6.25 Bitcoins per block. I have not described in detail what the core software actually does, although I have mentioned that it maintains the block time at around ten minutes.

We have discussed these ideas broadly, but not technically.

Do you think we should, in this course, go a little deeper into the technical aspects as well? This would help you develop a confident understanding of the philosophy behind Bitcoin mining — what the actual technology is and what innovations make it possible.

In this section, I intend to discuss those deeper details — including the mathematical functions, cryptographic functions, and the concept of the hash — which form the foundation of Bitcoin mining.

My goal is that by the end of this section, you will have a crystal-clear understanding of how the process works, how the software functions, and how the mining itself takes place. This detailed understanding will help you feel more confident about the entire concept.

Before we go further, I would like to share a bit of the history behind this concept, because without understanding the background, it is difficult to truly grasp the deeper insights of the process.

Let me tell you what Satoshi Nakamoto did in introducing the practical solution of Bitcoin mining. His innovation was based on combining three or four existing technologies that had already been developed during the 1960s, 1970s, and 1980s — particularly the computer technologies of the 1970s and 1980s.

Satoshi Nakamoto mixed these earlier technologies to create a practical solution for Bitcoin mining. When I say “practical solution,” I mean that before Bitcoin, this was purely a theoretical problem — one that had been discussed for decades in computer science and mathematics, commonly known as the Byzantine Generals Problem.

This problem was first presented in a computer science journal in 1982, where a potential solution was discussed.

The Byzantine Generals Problem was originally a military strategy problem, but became a key concept in computer science because it represented the challenge of achieving trust and agreement in a distributed system — exactly what blockchain solves today.

Let me explain. The issue was that in the Byzantine army, which surrounded a city during war, the generals needed to coordinate their decisions — whether to attack or retreat. Each general was positioned on different sides of the city with his own group of soldiers, and the only means of communication among them was through written messages.

The problem was that if even one general became a traitor and sent false information, the entire strategy could collapse. A single wrong message could confuse the other generals, leading to a disastrous defeat.

In the same way, in computer networks, a similar problem existed: if even one node (computer or server) malfunctioned or sent conflicting information, it could cause major issues for the entire network.

The 1982 research paper identified this problem and proposed solutions to ensure that even if some nodes failed or sent false data, the overall system could still function reliably and reach consensus.

This was the core idea that later inspired the development of blockchain — a system designed to ensure that truth and agreement could be maintained across thousands of distributed computers, even if a few nodes were compromised or dishonest.

This problem — the Byzantine Generals Problem — was the starting point in 1982 for what eventually evolved into blockchain technology. It represented the first real-world theoretical foundation for achieving decentralized trust, which became the basis for Bitcoin and modern blockchain systems.

Byzantine Fault Tolerance Algorithm remained an unsolved aim of the war strategist in human history for 1000 years, until 1982, when computer science tried to give practical solutions.

This problem, known as the Byzantine Generals Problem, had a solution proposed in the form of what is called the Byzantine Fault Tolerance Algorithm.

They needed a way to ensure that even if one general — meaning one traitor in the entire army surrounding the city — became disloyal or faulty, the system could still function effectively. It was highly probable that one or two generals might turn traitors or make errors, and they needed an algorithm that could tolerate such faults. That was the solution they had been searching for.

Essentially, they were looking for a method to reduce dependence on any single general. Within the different divisions of the army, information was shared and mixed among members, sometimes even bypassing certain generals. The goal was to ensure that loyal generals received accurate information while traitorous generals did not — a very difficult challenge.

To achieve this, they had to involve not only the generals but also the soldiers within each army division. Even if a general became a traitor, it was likely that most of his soldiers would remain loyal. Therefore, the information had to be passed through the entire army — within the ranks and files of each division — not only through the generals.

This created a system based on consensus, meaning that information was shared openly within the group to minimize the risk of misinformation from any single faulty general. By doing this, the system could bypass a potential traitor and still maintain reliable communication and coordination.

This approach led to a partial solution to the Byzantine Generals' Problem. Over the years, particularly in the 1982 research paper, game theory and mathematics were used to theoretically model this solution, known as the Byzantine Fault Tolerance Algorithm.

This algorithm aimed to identify how distributed systems could reach consensus even when some participants were unreliable or malicious. This theoretical work became the foundation of modern cryptography.

What Satoshi Nakamoto did later was combine all these earlier research findings and ideas into a single, unified technology — what we now know as blockchain.

His creation marked the first practical implementation of the Byzantine Fault Tolerance Algorithm, transforming it from a theoretical concept based on mathematics and game theory into a real, functioning system.

In the crypto practical solution of the Byzantine Fault Tolerance Algorithm, the Proof-of-work concept proved to be the first clue to the practical implementation of the Byzantine Fault Tolerance Algorithm, which was adopted in computer science in the form of new blockchain technology and crypto. The concept is discussed in more detail in the next video.

In computer science, the practical implementation of the Byzantine Fault Tolerance Algorithm required the concept of Proof-of-work. This is accomplished by so-called Bitcoin Mining. Watch the next video to know more.

This was the first time Satoshi Nakamoto made a practical implementation in computer science of the Byzantine Fault Tolerance Algorithm.

That is how this whole concept began.

In this practical implementation, one very important element was — and still is — the proof of work. In place of the generals in the Byzantine army, the modern practical solution involves computer nodes.

These generals, in the original problem, are now represented by computer nodes that are connected to each other in a decentralized network. They are also called network participants or, in the case of Bitcoin, miners.

In a decentralized network, the importance of the Byzantine Fault Tolerance Algorithm becomes even greater. These nodes or Bitcoin miners are interconnected — they can send, receive, transmit, and store data among themselves.

However, just like the Byzantine generals, these nodes do not trust each other. Each node is designed to be skeptical of the others, and trust is replaced entirely by mathematics and cryptography.

This brings us to the concept of proof of work, which I will explain in more detail. I have already mentioned this idea briefly before, but now I will discuss it in its historical context and describe the exact method of how it works.

Through this, you will gradually understand what we are trying to achieve.

This practical implementation by Satoshi Nakamoto was both suggested and successfully executed, and as we know, it became the most successful application of the Byzantine Fault Tolerance Algorithm.

The result of this innovation is Bitcoin — a revolutionary cryptocurrency based on an equally revolutionary blockchain technology. Bitcoin has proven that a digital currency can, in fact, be extremely useful, secure, and transformative.

In this system, the nodes — similar to the Byzantine generals — can receive, create, store, and send data. They have all the powers and roles that the generals had in the earlier analogy.

What is required to maintain this system is the proof of work, which ensures network consensus.

The main pillar of this technology is consensus, which I will explain further later on. The basic idea, as I have already discussed, is that this system maintains security even in an environment where some nodes are non-compliant — meaning they may try to manipulate, alter, or interfere with the data.

Just as in the Byzantine Generals Problem, some nodes in a decentralized computer network may act like traitors — becoming faulty or deliberately attempting manipulation.

The proof of work mechanism is what secures this network consensus, ensuring that even in the presence of such unreliable nodes, the system remains trustworthy, verifiable, and tamper-proof.

I will explain this proof of work concept in greater detail next.

In the next video, the actual nuts and bolts of Bitcoin mining are discussed in order to understand the concepts of Bitcoin mining and block reward, threadbare.

In order to understand the whole concept more deeply, we actually need to go into the nuts and bolts of how miners create new blocks.

Unless we explore the details of Bitcoin mining, we will not be able to understand what actually happens in the process.

The first step miners take in creating new blocks is to collect and aggregate new transaction data — meaning Bitcoin transaction data that has not yet been included in earlier Bitcoin blocks.

You already know the concept of Bitcoin blocks, which I have explained earlier. These blocks contain transaction information. Therefore, miners must first find, collect, and aggregate new transaction data.

All Bitcoin miners perform these steps independently, because they are not supposed to trust one another, even though they are connected and capable of sending and receiving information. They have multiple enablers and powers, but mutual trust is intentionally excluded — this is a fundamental design of the system, and it mirrors real-world situations.

Once miners collect and aggregate new data, they independently verify it based on 30 to 40 rules and criteria for transactions, as well as another 30 to 40 rules for the creation of Bitcoin blocks. Each rule must be checked one by one to ensure accuracy and validity.

This is the first step for Bitcoin miners.

Some examples of these transaction rules include:

1. Tracking the source of the digital money spent — determining where the funds originated.

2. Checking for double-spending, ensuring that the same money is not being spent twice. This is a critical rule because the double-spending problem was the main issue solved by this system, making it the first practical solution to the Byzantine Fault Tolerance problem.

3. Verifying the total volume of transactions to ensure it falls within a logical range.

The logical range is between 0 and 21 million Bitcoins, since 21 million is the maximum number of Bitcoins that can ever exist. If a transaction exceeds this range, it indicates manipulation or the presence of a faulty or malicious node.

Once the transaction data has been verified, it is added to a transaction pool — a temporary waiting area where transactions reside before being included in a block. This is called the memory pool, or mempool for short.

Bitcoin miners then aggregate and create mempools of all verified transactions. These aggregated transactions, once verified, remain in what is known as a candidate block. A candidate block is a collection of mempools that is still in transition, waiting to be added as a new block to the blockchain.

To proceed, all Bitcoin miners must create a block header.

Let’s go step by step through what Bitcoin miners do:

1. They start by collecting and aggregating new transaction data.

2. They verify each transaction against various criteria — around 30 to 40 rules for transactions and another 30 to 40 for blocks.

3. Once verification is complete, they create a block header.

The block header contains:

• A summary of all transaction data in the candidate block, generated through a hash function.

• A link to the previous block in the blockchain (the parent block), to ensure no duplicate transactions exist in the new block.

• A timestamp, recording the exact time the block was created — crucial for identifying which transactions belong to a specific time frame.

All this data — the summary, link, and timestamp — is processed and added to the block header using a hash function, which I will explain shortly.

Most importantly, the block header must also include a valid proof of work. It is not enough to simply have proof of work; it must be valid, meaning the miner has successfully met the required conditions before anyone else.

In other words, miners are competing with one another to create a valid block header first. The miner who succeeds first receives the block reward.

That is the concept.

Now that I have gone a bit deeper into these details, what we need to understand next is:

• What is a hash function?

• How does it work?

• What is meant by valid proof of work?

These are the most important technical aspects of Bitcoin mining, which I will explain in the subsequent sections.

Here is an example of a block header from an older block when the block reward was 12.5 BTC (now reduced to 6.25 BTC).

The header shows details such as:

• Number of transactions

• Block height (its position in the blockchain)

• Block reward amount

• Timestamp

• Mining information

• Merkle root

• Previous block reference

• Difficulty level

• Bits (difficulty target)

• Size

• Version

• Nonce

The nonce represents the special “magic number” or hash number, which acts as the valid proof of work.

The nonce is the main goal of miners. Once the correct nonce is found, the block becomes valid and is added to the blockchain.

When a block is completed, all the information in the block header — created through hash functions — generates a digital fingerprint, also known as a unique identification code.

Hash functions are at the core of this process and play a vital role in achieving proof of work. I will now go further into detail about what hash functions are and how they operate, so that you can fully understand their importance in Bitcoin mining.

This was the first time Satoshi Nakamoto made a practical implementation in computer science of the Byzantine Fault Tolerance Algorithm.

That is how this entire concept began.

In this practical implementation, one very important element was—and still is—the proof of work. In place of the generals of the army, the modern system uses computer nodes.

These generals, in this practical solution, are actually the computer nodes that are connected. They are also called network participants or miners, in this case, Bitcoin miners.

In a decentralized network, the importance of the Byzantine Fault Tolerance Algorithm becomes even greater. These nodes or Bitcoin miners are interconnected—they can send, receive, transmit, and store data with each other.

However, they do not trust one another, just like the Byzantine generals who were not supposed to believe each other and had to remain cautious. This lack of trust continues in this solution as well. The entire system is built purely on mathematics and cryptography, not on personal trust.

This is where the proof of work becomes essential, and I will explain it in more detail shortly. I have already mentioned this concept earlier, but here I am putting it in a historical perspective and explaining the exact method by which it works. Gradually, you will understand what we are trying to achieve.

This was the practical implementation by Satoshi Nakamoto—first suggested, and then successfully executed. As we know, this became the most successful implementation of the Byzantine Fault Tolerance Algorithm.

The result is Bitcoin, a revolutionary cryptocurrency based on the equally revolutionary technology of blockchain. The world has gained this groundbreaking technology, and Bitcoin has demonstrated that a digital currency can, in fact, be extremely useful and powerful.

In this system, the nodes in this practical implementation can receive data, create data, store data, and send data. These nodes have powers similar to the Byzantine generals in their respective systems.

What is required here is the proof of work, which ensures network consensus.

The main pillar of this system is network consensus, which I will explain further later. The basic idea, as already discussed, is that the system remains secure even in an environment where some nodes are non-compliant—that is, nodes that may try to manipulate or tamper with data.

Just like in the Byzantine Generals Problem, some nodes in a decentralized computer network can act as traitors. They can become faulty or deliberately manipulate information.

The proof-of-work mechanism ensures that the network consensus remains intact even in the presence of such non-compliant nodes. I have already discussed this briefly, and I will explain it in detail next.

Satoshi Nakamoto mixed three major technologies of the 1960s, 70s, and 80s to create the practical implementation of the Byzantine Fault Tolerance Algorithm by creating Bitcoin, through his research paper first published in 2008. The role of hash functions was the core technology that was part of this three-technology mix. Watch the next video to understand why Hash functions are so important in the successful implementation of Proof-of-work.

Friends, hash functions are basically fixed strings of characters that are the output of a function.

For example, in mathematics, we have 15 divided by 3, which gives 5. In this case, 5 is the output.

Hash functions have a special property — in these functions, any kind of digital data, whether it is a PDF file, an image file, or text — any alphanumeric or digital information — can be fed as input, and the hash function will create a fixed set of digital strings as output. The nature of this output depends on the specific hash function being used and its characteristics.

A key feature of hash functions is that they are one-directional — meaning they cannot be inverted.

To understand what “inversion” means, consider this:
When we say 3 × X = 15, we can find the value of X by inverting the operation — X = 15 ÷ 3 — which gives us 5.
In this example, multiplication and division are invertible functions because you can go back and find the unknown value.

However, hash functions do not work like that.

The basic idea behind a hash function is that it must not be invertible, precisely to protect the input information.

For example, suppose you download a software program from the internet on a certain date.
If you pass this entire software through a hash function, such as SHA-256, the function will generate a one-directional output — a unique string of characters.

Now, if you download the same software again after a week or a month and pass it through the same SHA-256 hash function, it should produce the same output if the software has not been altered.

However, if any manipulation or tampering has been done — if a virus has been added or even a small change has been made — the SHA-256 function will produce a completely different string.

This means that by comparing hash outputs, one can easily verify whether a file has been altered or not.
If the output matches, the file is untouched.
If the output differs, it has been tampered with.

This one-way, non-invertible nature of hash functions ensures security and integrity.

For example, passwords stored in databases are often passed through hash functions like SHA-256.
Even if someone gains access to the hash output, they cannot reverse-engineer it to find the original password.

Thus, the purpose of a hash function is to protect the input data — whether it’s a text file, a number file, an image, a video, or any other digital form. It can digest any kind of input, but the output is always a fixed-length string.

For instance, in SHA-256, the output is a 64-character unique digital string.

Hash functions are extremely important in the concept of proof of work, which is why we are discussing them in detail.

Mathematical functions like multiplication and division can be inverted, but cryptographic hash functions cannot.

This means that to find the unknown input (that generated a given hash), you must try every possible combination of inputs.

This process requires immense computational effort and energy, which is why Bitcoin mining consumes so much electricity and computing power.

In Bitcoin mining, the goal is to find the unknown variable — the correct input — that produces an output meeting the required criteria of the hash function.

This process of finding that valid input — which satisfies the target condition of the hash — is called proof of work.

I will now give you an example to show how this works in practice, which will help you clearly understand the meaning and purpose of this concept.

The most popular hash function actually used in Bitcoin mining is SHA-256.

SHA-256 can digest all kinds of data, as I mentioned earlier. It is unidirectional, meaning you cannot go back to find the input once you have the output. That is not possible.

To find the input data that produces a desired output, let’s consider an example. Suppose the desired output is a 64-character unique alphanumeric string, which is the result of the hash function.

Now imagine you want this output to meet a specific criterion — for example, the first digit should be zero, or the first two digits should be zero, or the first three or four digits should be zero.

Since the function cannot be inverted, you have to try all possible inputs until you get the desired output.

The probability of getting an output with the first digit as zero is 50%, with the first two digits as zero is 25%, with three digits as zero is 12.5%, with four digits as zero is 6%, and so on.

As you can see, the more leading zeros you require in the output, the smaller the probability of finding the correct hash. The difficulty keeps increasing exponentially — from 50% to 25%, to 12%, to 6%, and so on.

For example, if the requirement is to have 40 digits out of 64 as zeros, the number of possible combinations would be in the quadrillions (10¹⁵). That means billions of attempts and guesses are required before you can find the right input — the nonce — that produces the desired output.

Let me give you an example to explain how this works.

Suppose the input is “Hello!” (with a space and an exclamation mark). You can try this yourself — go to the internet and find a SHA-256 hash generator. Enter any text, number, or digital file as input, and it will give you a unique hash output.

When I entered “Hello!” as input, I received one specific output.
However, I wanted an output where the first digit of the hash string is zero.

When I tried “Hello!” — I didn’t get it.
When I tried “Hello0” — still didn’t get it.
When I tried “Hello1” — again, no.
When I tried “Hello2” — no result.
But when I tried “Hello3,” I finally got an output starting with zero.

This shows that there is no mathematical relationship between the input and output. The output is random and cannot be predicted.

The only deterministic aspect is that if you input the same data again, it will always produce the same output — that’s the reliability of the hash function.

However, there is no correlation between different inputs and their outputs. The output will always be the same for the same input, but completely random for every new input.

In this example, since the requirement was only to have one leading zero, it was easy and quick to achieve.

But if the requirement was to have 40, 45, or 50 leading zeros, it would take quadrillions (10¹⁵) of attempts and enormous amounts of computational power, energy, and time.

This is exactly what happens in Bitcoin mining. The more leading zeros required, the more difficult it becomes — and this difficulty level is known as the “difficulty target” or “bits” in the block header.

The difficulty target determines how hard it is to find the first valid input (nonce) that meets the criteria. The higher the difficulty (more leading zeros), the more time, energy, and money it takes.

Depending on how many miners are participating, the Bitcoin Core software automatically adjusts the difficulty target — increasing or decreasing the number of zeros required.

If there are more miners, the difficulty increases (more zeros).
If there are fewer miners, it decreases (fewer zeros).

The goal is to maintain the block time at around 10 minutes, ensuring that approximately every 10 minutes, a new block is created and a reward of 6.25 BTC is issued (as per the current reward rate).

This session was meant to explain the technical side of hash functions — their role in Bitcoin mining, how they work, and how they connect to the concept of proof of work and difficulty targets.

I have given you the background, the perspective, the importance of hash functions, the concept of SHA-256, and how the block reward is achieved.

Bitcoin is just one example — the same process is used in many other cryptocurrencies as well.

Did you understand what I explained in this section?

If anything is unclear, I recommend revisiting this section to get a better understanding of what happens during Bitcoin mining.

If you have any comments or suggestions, please share them, because I believe this is the most important and technical part of the entire course.

Having understood all about the components of the practical solution, like bitcoin mining, hash functions, bitcoin blocks, and their structure, it is time to finally understand how proof-of-work secures the network consensus, which serves as the virtual authority that further monitors the process of bitcoin and its practical implementation as a truly digital currency. I'd like you to please watch the concluding video in this section, which explains this concept.

Friends, this is the last video of this section, which is a very important one because it explains the exact nature of Bitcoin mining and how the process works.

The last question I will take up in this concluding video of the section is about the role of proof of work in securing network consensus.

This is extremely important because, ultimately, we must understand the connection between proof of work and the sanctity of transactions, the authenticity of the block header, and the prevention of manipulation. What is the logic behind the relationship between proof of work and the authenticity of transactions? That is crucial to understand. Otherwise, the very purpose of proof of work becomes redundant.

Let me first give you a simple answer before going into detail.

Proof of work requires enormous effort—in terms of computational power, hardware investment, and electricity costs. The process involves serious expenses and intense competition, as miners race to be the first to guess the correct magic hash number.

Given these high costs and efforts, it is obvious that any rational person would not submit unverified, manipulated, or tampered information. The probability of someone doing so is extremely low.

This is very similar to the Byzantine Generals Problem, where a few generals might become traitors. Likewise, in a network, a few nodes can be compromised. However, if a miner successfully performs the proof of work and guesses the correct hash, and knows that submitting accurate, verified data will get him rewarded, the likelihood of dishonest behavior becomes minimal—though not impossible.

Let me illustrate this with an example.

Assume a Bitcoin miner has successfully found the correct nonce—the magic number—and is confident he is the first to do so. He has the right timestamp and believes his block will be included in the Bitcoin blockchain, moving from the transaction pool (the candidate pool) to the main blockchain.

Now, suppose he gets compromised and tries to manipulate the information.

Every Bitcoin miner, when submitting a verified block along with the nonce and proof of work, essentially writes a “cheque” for themselves, representing the reward they will receive. Currently, this reward is 6.25 BTC.

This transaction has no input—only output—because this is how new Bitcoins are introduced into circulation.

Now imagine that, instead of writing a cheque for 6.25 BTC, the miner writes 7.0 BTC.

When he submits this block, it will go into the mempool (the waiting area for pending transactions). However, this particular transaction will not be valid.

By the time his block is ready to be included in the blockchain, other competing miners, who are constantly checking for faults in submissions, will detect this error—that he has written 7.0 BTC instead of 6.25 BTC. As a result, his block will be rejected.

No rational miner would take such a risk after investing so much time, effort, and computational energy.

Hence, it is clear that once a miner has completed the proof of work and found the valid nonce (the correct hash number), they will, in all probability, submit accurate and verified information. They will provide a valid block in the candidate pool, expecting to receive their rightful reward.

This is the link between proof of work and network consensus security.

The proof of work ensures that the network remains largely secure and trustworthy because of the immense effort and incentive structure built into the system.

However, as I mentioned earlier, there remains a theoretical risk. If a particular group of miners or mining teams were to gain control of more than 51% of the total computing power, they could manipulate the data. This is known as a 51% attack.

But in reality, organizing and maintaining such massive computational power under one entity is extremely difficult, making this scenario highly unlikely.

Although there have been a few isolated instances of similar events in Bitcoin’s history, they are rare and short-lived.

With this, I conclude this section, which provided a deeper look into the process of Bitcoin mining—its logic, security, and connection to the proof-of-work mechanism.

If we talk about the specific application of blockchain technology in foreign trade transactions, the benefits are immense. The major portion of exports from many developing countries, such as India, Mexico, and Brazil, is carried out by small and medium enterprises (SMEs) that operate through highly cost-effective methods and reduce export costs through their expertise. These MSMEs are likely to see major advantages of using Blockchain in Foreign Trade applications.

Friends, if we talk about the specific application of blockchain technology in foreign trade transactions, the benefits are immense. The major portion of exports from many developing countries, such as India, Mexico, and Brazil, is carried out by small and medium enterprises (SMEs) that operate through highly cost-effective methods and reduce export costs through their expertise.

To reduce costs and benefit from lower entry barriers, the participation of small and medium exporters in the international trading system becomes easier. Importantly, blockchain technology can create a safe and transparent environment for SME exporters by eliminating the need for third-party intermediaries, such as banks. It can also speed up operations and increase the trust of buyers in companies operating on smart contract platforms like Ethereum, which are based on blockchain.

Exporters will be able to reduce the costs of risk management, including commercial risk, transportation and transit risk, and foreign exchange risk. Many of these risks can be managed by exporters at just a fraction of the current cost. Smart contracts based on blockchain also provide an easy and quick payment option for MSME exporters.

These are some of the key benefits of blockchain technology in e-commerce applications, particularly through smart contracts, smart supply chains, and the Internet of Things (IoT), for exporters worldwide—especially small and medium-sized exporters.

If we look at the indicative direct benefits to exporters, as per recent research focused on the direct cost advantages (excluding the many other indirect benefits), both immediate and long-term benefits are evident.

There are three or four major components of benefits accruing to SMEs: bank charges, transportation costs, intermediary costs, and foreign exchange management costs.

According to the research, the component of bank charges in international transactions currently accounts for around 20% of total transaction costs. This can immediately be reduced to 10% using smart contracts, and in the long term, it can be brought down to just 2–3%.

Similarly, transportation costs—which currently average around 25% (depending on whether the shipment is by sea or air)—can be reduced by about 5% immediately, bringing it down to 20%, and in the long term, reduced further to 15% of total transaction costs through the use of blockchain technology.

Other intermediary costs, such as those of consolidators, guarantors, quality certificate providers, and similar agents, currently account for about 10% of total transaction costs in foreign trade. These can be reduced to about 5%.

The maximum benefit, however, comes from foreign exchange management, which currently costs around 6–7% of total transaction costs. This can be immediately reduced to 2–3%, and in the long term, brought down to almost zero.

Bank charges can be eliminated in the long run. Similarly, transportation costs and intermediary costs—such as those of consolidators, guarantors, financiers, credit guarantors, and due diligence providers—can be drastically reduced.

Furthermore, if the use of cryptocurrency is allowed globally for international transactions (which most local governments should eventually approve for genuine trade), foreign exchange costs could be reduced to nearly nil in the long run.

These are the direct benefits that can accrue to exporters through the effective use of blockchain technology in international trade.

Now, if we look at another application of blockchain technology for the benefit of international traders, we can see its great potential if adopted by international online marketplaces such as Amazon, Shopify, Etsy.com, and many others.

Global selling can become more efficient, cost-effective, and secure for both exporters and importers if these marketplaces are based on blockchain platforms.

The main benefit would be the reduction in the overall cost of global selling on international marketplaces like Amazon. It would also enhance international fulfillment operations—both by exporters and by marketplace service providers offering facilities such as Amazon FBA. These services would become more transparent and far more cost-effective.

In the near future, we can expect the emergence of new international marketplaces that will compete with existing giants like Amazon’s Global Selling Platform. These new marketplaces will almost certainly be based on blockchain technology, providing better value to their subscribers.

It is important to note that blockchain-based platforms will offer greater marketing value to exporters because importers will have increased trust in the offerings made by the exporters participating in such platforms. This enhanced trust will serve as a significant marketing advantage for exporters operating in a blockchain-based environment.

Ultimately, these international marketplaces built on blockchain technology will introduce a new level of operational efficiency, leading to improved pricing and profitability for exporters.

This is now becoming a global race to leverage the benefits of blockchain technology. The countries that adopt and implement it faster will have a clear competitive edge.

Local governments have a vital role to play in this process. They need to establish the right regulatory frameworks, protocols, rules, and guidelines to facilitate blockchain-based international trade and ensure alignment with customs and tax authorities.

The governments that act swiftly will create significant advantages for their MSME sectors—that is, the micro, small, and medium exporters—from their respective countries.

Compared to the paper-intensive and time-consuming processes involved in the traditional methods of trade finance, by digitizing the end-to-end exchange of information and streamlining the process of LC issuance and confirmation, all trade participants achieved a significant reduction in processing time and costs using the new, emerging Blockchain-based letter of credit. In the next several videos, Dr. Jain has discussed several aspects of the blockchain-based letter of credit system.

A typical LC transaction

The figure below shows the stakeholders involved and the sequential steps required to carry out a complete Letter of Credit (LC) transaction.

World product exports exceeded US$20 trillion in 2020. Imports and exports—the key pillars of global trade—have long relied on Documentary Credit or Letter of Credit (LC) systems, which account for around 13–16% of total global trade. An LC assures the exporter (seller) of receiving the agreed payment for their goods while simultaneously assuring the importer (buyer) of receiving the correct goods, in the right quality, and on time. The risk is mitigated through reputed banks acting as intermediaries.

The International Chamber of Commerce (ICC) established the Uniform Customs and Practice for Documentary Credits (UCP 600 Revision) as a set of rules governing the issuance and use of LCs. With the advent of electronic messaging, international banks began using SWIFT (Society for Worldwide Interbank Financial Telecommunication), which established a standardized format for LC communication through its MT 700 series.

A typical traditional LC transaction involves multiple stakeholders and a series of steps, as shown in the figure below.

Inherent Limitations of LC

1. Prohibitive Bank Fees:
A letter of credit increases the cost of doing business. Banks charge fees for issuing and handling LCs, and the fees rise steeply if additional features are added. This becomes a major hurdle for MSME importers and exporters.

2. High Messaging Fees:
Most banks use the SWIFT network for exchanging LC-related messages, which incurs charges based on the message type, content, and volume. Any amendment to the original LC is also costly and time-consuming.

3. Common Payment Disputes Due to Contractual Ambiguities/Conflicts:
Interpreting semantic ambiguities in LC contracts often requires discretionary judgment by banks. An ICC study found that 60–70% of documents presented for LC evaluation are rejected on first presentation due to discrepancies.

4. LC Frauds:
As discussed earlier, LCs pose a fraud risk to importers. Banks release payment based on shipping documents rather than the actual quality of goods. Disputes may arise if the goods delivered differ from the agreed specifications.

5. FX Risk:
An LC carries foreign exchange risk because the credit is issued in a specific currency. At least one party will deal in a different currency and may face exposure to currency fluctuations—though sometimes this can work in their favor.

A Robust Blockchain Solution

Using a federated distributed blockchain, an LC can be modeled as a blockchain-based smart contract between the importer and exporter to guarantee payment once the goods are delivered in compliance with all documentary conditions.

A blockchain-based LC is issued on a Distributed Ledger Technology (DLT) network that includes the exporter, importer, issuing bank, advising bank, and possibly even the transporter (using e-commercial documents).

Steps involved:

1. The importer drafts the LC terms and conditions and stores them immutably on the blockchain network.

2. The draft is presented to the issuing bank, which reviews and approves it.

3. The exporter and their advising bank can also review and approve the draft.

4. The blockchain network consensus ensures there is only one copy of the LC accessible to all authorized parties.

5. Once reviewed and approved by all parties, the issuing bank finalizes and issues the LC to the exporter.

6. Any amendments can be made through a multi-signatory mechanism, with permissions granted to the relevant participants. The blockchain smart contract includes all terms and conditions of trade.

The blockchain-based schema of LC operations includes contractual clauses such as:
a. Date of delivery
b. Port of delivery
c. Packaging and handling
d. Mode of transport
e. Bill of Lading
f. Customs clauses
g. Quality and quantity certificates

Based on the documentary evidence submitted by the exporter, verification of the LC terms can be automated, and payment can be released—potentially using cryptocurrency.

Major Advantages

• LC requirements are documented in a smart contract with precision and accuracy regarding time, place, mode of delivery, and product quality.

• It enables transparency across all transactions and operations, from tracking invoices to digitizing documents.

• The issuing bank can verify conditions based on documents submitted by the exporter or advising bank, effectively removing ambiguities.

• All stakeholders have visibility into the latest LC status, allowing for faster resolution of discrepancies.

• Any change or amendment can be processed quickly and cost-effectively through a multi-signatory mechanism.

Who Is Working on Blockchain-Based LCs?

Distributed ledgers are business-to-business workflow tools, meaning blockchain inherently requires collaboration—to set standards, build infrastructure, and execute transactions. Consortia have emerged as the primary way for blockchain-friendly organizations, regulators, and governments to work together.

There are two main types of blockchain consortia:

A) Business-Centered Consortia:
These focus on building and operating blockchain-based platforms to solve specific business problems. Examples include Voltron and Marcopolo, which use R3’s Corda blockchain for trade finance operations. Another example is BiTA, a blockchain association for international transport operators.

B) Technology-Centered Consortia:
These aim to develop reusable blockchain platforms based on common technical standards. A key example is Hyperledger, an open-source blockchain project under the Linux Foundation with contributions from IBM, Intel, and SAP Ariba. Hyperledger supports the collaborative development of blockchain-based distributed ledgers and includes popular frameworks such as Fabric, Indy, Sawtooth, and tools like Caliper, Cello, and Explorer.

The figure below lists several leading consortia and their supporting partners in trade finance.

IN THE NEXT SEVERAL VIDEOS, DR. JAIN DISCUSSES AND EXPLAINS THE ABOVE CONCEPTS IN MORE DETAIL.

Today, I will be talking about the blockchain-based letter of credit.

Some efforts have already been made, and new concepts have entered the market. Things are moving in the right direction, and in the very near future, we are likely to witness major changes in the operation and perception of the letter of credit.

Currently, out of all international trade financing instruments, only about 10–15% are documentary letters of credit. This ratio is expected to increase manyfold with the adoption of blockchain technology, which will address several challenges associated with the present LC system.

Let us first discuss the advantages of using the blockchain platform in trade financing.

Blockchain technology addresses many of the key challenges facing the trade finance sector. These challenges include transparency and consensus among the participants in an LC operation. Blockchain helps manage the risk of documentary fraud, reduces transaction costs, and simplifies reconciliation between and within banks and other parties involved.

Another major challenge relates to traceability—ensuring the assurance and authenticity of products in the supply chain. The very nature of blockchain’s traceability feature, combined with its single-platform system, makes the blockchain-based LC much more reliable and authentic. It mirrors the physical part of international trade transactions, tracking goods as they move through global logistics networks.

A third challenge that blockchain addresses relates to immutability—the inability to alter or modify information—and digital uniqueness. The secure and verifiable transfer of value through blockchain technology provides a solution to one of trade finance’s long-standing issues: endorsement.

In traditional systems, questions remain, such as:
Who verifies the authenticity of a transaction?
Who endorses the physical movement of goods?

Banks deal only with documents—not the physical goods—so there is no foolproof way to ensure that the transaction fully matches reality. Blockchain eliminates this problem through cryptographic mathematical validation, ensuring that it is practically impossible to create fake transactions or commit buyer/seller-related LC fraud.

The challenge of maintaining data privacy among counterparties—often referred to as creating “Chinese walls”—is also solved through tokenization, a robust and digitally unique cryptographic concept. Tokenization ensures that only authorized parties who are part of the LC consortia have access to specific, permissioned information. This guarantees transparency for those involved while maintaining complete data privacy.

The distributed nature of blockchain provides resilience and robustness, making the system both secure and scalable. It can be broadly adopted at a reasonable development cost. The platforms that enable such transactions can process them within seconds, and the cost per transaction becomes negligible when distributed across a large volume of operations.

Smart contracts—the core of blockchain’s e-commerce applications—enable self-triggering and self-executing agreements that operate through the automated exchange of digital data. This feature has the potential to revolutionize the traditional letter of credit system.

In essence, a blockchain-based LC becomes a smart contract programmed to execute automatically without manual verification by intermediary banks. Once all required protocols are met, the system itself enforces compliance, ensuring the integrity of every step in the process.

This transformation has the power to completely revolutionize the long-standing LC mechanism.

The Internet of Things (IoT), though still in the early stages of application in trade finance, is progressing rapidly. With the support of technical and business consortia, IoT applications are being integrated into blockchain platforms. This development will drastically reshape how letters of credit function—expanding their scope beyond mere documentary credit to include physical tracking of goods.

IoT will enable the monitoring of physical assets as they are moved, tracked, and purchased in real time. This ensures that goods are genuinely transported as agreed, safeguarding the interests of both buyers and sellers.

All these advantages—cost reduction, transparency, automation, and accessibility—make blockchain-based letters of credit particularly beneficial for micro, small, and medium-sized exporters (MSMEs). The digital, transparent, and always-available nature of the blockchain LC system (24/7, 365 days a year) makes it an ideal and affordable solution for small exporters across the world.

Let us now try to understand the concept of the blockchain-based letter of credit.

It has been proposed that there are mainly seven steps to a blockchain-based letter of credit transaction.

And what are these steps?

The importer creates an LC application for the importer’s bank to review and store on the blockchain platform or network.

The importer’s bank receives a notification to review the letter of credit and can either approve or reject it based on the application type, the data provided, and the conditions mentioned.

Once checked and approved by the importer’s bank, access is automatically provided to the exporter’s bank (the advising bank) for verification, endorsement, and acceptance by the exporter.

In the next step, the exporter’s bank approves or rejects the LC. If approved, the exporter is able to view the LC requirements on the same platform. Permissions are granted step by step to the parties involved.

If the issued letter of credit is approved by the advising bank (the exporter’s bank), the exporter can view the LC requirements and conditions in detail and is prompted to review the complete application.

The exporter then completes the shipment, adds the invoice and export application data, and attaches photo images or any other required documents in the prescribed manner. Once validated, these documents are stored on the blockchain.

In step five, the documents are reviewed by the exporter’s bank, which approves or rejects the application. The exporter’s bank, now acting as the negotiating bank, reviews the data and makes a decision accordingly.

Next, the importer’s bank reviews the data and images against the stated requirements. If approved and ready for further negotiation, the importer’s bank may mark any discrepancies for review by the importer.

This review by the importer is still under discussion regarding how it should be implemented, because ultimately, the payment is made by the bank, not the importer. However, depending on the platform, the smart contract structure, and the blockchain’s immutability, the importer can review the transaction as well.

When approved, the LC moves to completed status or is sent to the importer for final settlement if required. In cases where discrepancies are identified, the importer can review the export documents and either approve or reject them based on their nature.

If the discrepancy is acceptable to the importer, the importer can still approve it, and payment will then be made to the exporter.

These are the seven steps of a blockchain-based letter of credit.

Hello, friends.

Welcome back.

I’m sure that you are enjoying this course.

In the last episode, I discussed the seven steps of the blockchain-based LC cycle. These are entirely new concepts, and as you can understand, they are still in the experimental stage. However, they are expected to become very popular in the near future.

Let us now look at the blockchain-based LC cycle from another perspective.

For example, if you look at the traditional LC cycle, which you already know very well—I have discussed it in my earlier episodes—this is the typical traditional LC process where the LC instructions are given by the applicant, and the issuing bank issues the letter of credit. The advising bank endorses and verifies the letter of credit and then advises the exporter, who either accepts or rejects the LC.

Once accepted, the exporter begins the process of exporting goods—loading the goods on the ship, sending them to the port of discharge, obtaining all transport documents, and creating the commercial invoice, certificate of origin, packing list, and other required documents as per the LC conditions. The exporter then submits all these documents to the advising bank, which now acts as the negotiating bank.

Thereafter, the negotiating bank presents the documents under the credit to the issuing bank to obtain reimbursement.

This is a very typical type of LC cycle.

In between, this traditional LC cycle allows for possible amendments, which can come either at the request of the exporter or as per the wishes of the importer, but only in complete agreement with all the parties involved—otherwise, the amendment holds no value.

What happens in this entire cycle is that there are many steps involved, and this process has remained completely manual for decades. Since 1933, this system has been in use. Because of its manual nature and the high cost of communication, several challenges exist in the present system of documentary credit.

As a result, two important things happen:

First, the cost of the traditional LC cycle remains very high. This is one of the main reasons why only about 10 to 15 percent of total international trade financing takes place through documentary credit.

Second, the process takes a lot of time. The manual nature of the system makes it very inconvenient for both exporters and importers, creating a lack of real-time visibility and traceability.

The possibility of LC fraud remains high for both exporters and importers.

The traditional LC cycle, therefore, has not seen the kind of modernization or overhaul that it truly requires, even after so many decades.

This letter of credit, which is based on blockchain, looks something like this.

The seven steps that I just discussed with you about the blockchain-based LC cycle can be easily understood when you realize that there is only one platform—the blockchain network, or the so-called blockchain platform.

On this platform, all activities take place over a single document, starting with the LC opening instructions.

In the blue box, you can see that the importer submits the LC opening instructions and conditions on the bank’s blockchain platform.

Here itself, this LC opening instruction becomes the letter of credit. You can see this represented by the green box—it is the same platform and the same document. There is no manual system here.

This platform is a multi-signatory access platform, where the parties involved are the importer, the importer’s bank, the exporter, and the exporter’s bank.

At the right time, access to all these parties is available on a single platform and the single document itself. There are no two separate documents—it’s only one comprehensive document containing all the information, conditions, and requirements of the importer, as well as those approved by the importer’s bank.

Once it becomes a full-fledged letter of credit, you can see in the red box that the advising bank verifies and endorses, and the exporter either accepts or rejects the letter of credit.

If the exporter rejects it, this is visible to the importer and the importer’s bank in real time, showing whether it has been accepted or not. There is a time-bound acceptance or rejection process, depending on this letter of credit on the blockchain platform, which now operates as a smart contract.

This smart contract, equipped with multiple automated features and the robustness of blockchain technology, combined with a single network, single platform, and single document, provides convenience, speed, and a high potential for cost reduction, because there is hardly any manual work involved.

Once it becomes visible to all the multi-signatories who have access to the permissioned data on this document, the entire process happens automatically, without any manual intervention.

The potential for cost reduction is therefore extremely high.

If any amendment is required, it is visible in real time. When an amendment is made by the importer or the importer’s bank, it is immediately available and viewable by the exporter’s bank as well as the exporter.

Any unwanted amendment or unauthorized change in the LC must be approved by all parties; otherwise, it will be automatically red-flagged in real time.

This entire system makes the letter of credit transaction simple, fast, and transparent—something similar to a credit card transaction.

With increased transaction volume and the elimination of manual work, all parties benefit. The potential for cost reduction is very high, and the convenience provided by a blockchain-based letter of credit means that the overall volume of trade finance transactions is bound to increase, from the current 10–15% of total international trade financing to many times that figure.

Banks also benefit from the increased volume without having to put in too much effort—whether it is issuing the LC, handling amendments, negotiating, or releasing payments.

The situation becomes win-win for all: the importer, the exporter, the importer’s bank, and the exporter’s bank.

This kind of technological change is truly incredible—something that has not been seen in many decades. This technology is undoubtedly going to revolutionize the way LC operations are handled in the future.

As I have just mentioned to you, I am explaining again this particular fact: what are the different challenges and limitations of the traditional LC?

The first issue is the high bank fees, primarily because there are extensive manual operations involved in the traditional LC cycle.

Next are the messaging fees. Most banks use the SWIFT network, which is both costly and time-consuming.

Another major issue is payment disputes due to contractual ambiguity. According to a recent study by the ICC, between 60% and 70% of the documents presented for LC evaluation are rejected on the first presentation due to discrepancies arising from contractual ambiguities.

In a traditional letter of credit, when documents are presented, the ambiguities inherent in the contract between the buyer and the seller—whether we like it or not—get reflected in the LC itself. These ambiguities create problems.

When there is a single document and a single platform like blockchain technology, the situation changes. It operates in real time, which means any ambiguity can be weeded out immediately, even before the shipment has taken place.

If any ambiguity remains, the exporter can red-flag it, ensuring it does not persist until the stage when documents are presented for negotiation.

Such payment disputes are very common in traditional LCs, and the percentage of discrepancies is very high—60% to 70%.

Additionally, there is always the possibility of fraud or misuse, which can occur on the part of the buyer, the seller, or sometimes even the banks themselves.

Another key limitation is currency risk. At least one of the parties—either the importer or the seller—deals in a currency other than their home currency. Naturally, currency fluctuations pose a financial risk to the party handling the LC in a foreign currency.

In the case of a blockchain-based letter of credit, it becomes possible to use cryptocurrencies instead of fiat currencies, in which case the chances of such risks are minimized.

As I have been mentioning throughout this session, the blockchain solution works in such a way that the LC terms can be drawn by the importer and stored immutably on a single platform within the blockchain network as a draft.

It comes from the seven steps, and this draft is then presented to the issuing bank for review and approval by the importer’s bank.

I am repeating this for the sake of better understanding so that you can clearly grasp the solution.

The draft can also be reviewed by the exporter and approved by his advising bank. It all happens in real time on a single document within a single platform, making the process far more convenient and significantly less costly.

The network consensus in this type of blockchain solution ensures that there exists only one copy of the LC, and all parties can work on it depending on their access rights.

Multi-signatory access is available on the system, allowing all parties to collaborate in real time.

Once reviewed and approved by all parties, the issuing bank finalizes the LC and issues it to the exporter.

This is very interesting because all parties are satisfied with this single document. It is simply a matter of one click by the issuing bank—and with that click, the LC becomes operational.

Any changes or amendments can be implemented using the multi-signatory mechanism by granting appropriate permissions to participants at the right time.

For example, when the LC is issued by the issuing bank with one click on the blockchain platform, the advising bank verifies it. Only then does the exporter gain access rights to view the LC. From that point onward, the exporter can see the letter of credit—the single document that serves as a blockchain smart contract containing all the terms and conditions of the trade.

Finally, based on the documentary evidence submitted by the exporter, verification of the conditions stated in the LC can be performed by the issuing bank.

If everything is in order, with just one click, the payment will be automatically transferred to the advising bank—or, in a blockchain-based solution, it can even be transferred directly to the exporter’s bank account.

This is how the entire system works—and this is the blockchain solution for the letter of credit process.

As happens with all new technologies, blockchain technology offers enormous new possibilities because of the single platform and the multi-signatory mechanism.

These possibilities arise from the uniqueness of digital contracts and smart contracts, and their invincibility—in the sense that nobody can alter them.

It is possible to completely eliminate the role of banks by using smart contracts and cryptocurrencies. If these are implemented, the blockchain platform itself can guarantee payment to exporters.

The requirement for, and role of, banks can therefore be eliminated through blockchain-based solutions.

It is also possible to include in the consortia the shipping companies, transporters, and carriers who can issue electronic bills of lading. The use of the electronic bill of lading ensures that the carrier also becomes part of the platform, acting as the fifth party, for example.

Not only carriers, but even other intermediaries—such as insurance companies, finance companies, or guarantors—can also participate. In cases where banks are not able to guarantee credit, a third party such as the United Nations, Asian Development Bank, or World Bank could act as guarantor for certain large, cross-country contracts.

The use of e-copies of other commercial documents also becomes possible, making the entire documentary requirement electronic—and fully achievable.

To understand this blockchain technology solution better, it is important to focus on blockchain distributed ledgers.

Blockchain distributed ledgers are business-to-business workflow tools that inherently require collaboration to create consortia. The purpose of these distributed ledgers—an inherent feature of blockchain technology—is to set standards, develop infrastructure, and execute international payment transactions.

This is a robust technology, and blockchain-based distributed ledgers form its core pillars.

It is also important to understand more deeply the concept of blockchain consortia.

Through collaboration and by inviting all the different parties connected to traditional commercial documentation, consortia are formed. Blockchain consortia act as the mechanism through which blockchain-interested companies, regulators, customs departments, and even governments can participate.

Governments, particularly those wanting to support micro, small, and medium enterprise (MSME) exporters, can become part of such consortia.

For example, in India, the Indian government can partner with blockchain consortia to promote and support exporters.

There are two main types of blockchain consortia:

1. Business-focused consortia, such as Voltron and Marcopolo, have demonstrated successful practical applications. collaborate

2. Technology-focused consortia, such as Hyperledger, focus on developing reusable blockchain platforms based on technical standards.

In these consortia, collaboration among multiple parties is possible.

An example of a business-oriented blockchain platform is the R3 Corda blockchain.

This distributed ledger blockchain platform has been widely used in business applications and has demonstrated its effectiveness through several successful examples, which I will share with you next.

Now, friends, if we look at real-life examples, we can see some remarkable developments. For instance, the first cross-border blockchain-based letter of credit transaction took place on September 17, as reported by NewsDesk.

The parties involved were from Singapore, with Standard Chartered Bank announcing the successful completion of the first cross-bank letter of credit transaction between Vietnam and Thailand, conducted over blockchain in partnership with the Asian Development Bank (ADB).

In this case, the ADB acted as the guarantor. The banks involved were the Bank for Investment and Development of Vietnam and Standard Chartered Bank of Thailand—the two institutions that formed the consortium for this transaction.

The transaction was completed over the Contour Network, a blockchain-based open industry platform focused on digitizing trade finance. It involved a USD 50,000 shipment of plastics from Thailand’s SCG Plastics Company Limited to Vietnam’s Opaque Plastics Joint Stock Company.

Compared to the paper-intensive and time-consuming processes involved in traditional trade finance, this blockchain-based transaction achieved a significant reduction in processing time, from up to five days to within seven hours.

This efficiency was possible due to the use of a single document and single platform, the Contour-based blockchain network, which I mentioned earlier in the discussion of the blockchain-based LC cycle.

This example also marks the successful completion of ADB’s first credit guarantee using distributed ledger technology, which, of course, is another name for blockchain technology. This is indeed a fascinating and pioneering example.

Now, let us look at some more examples.

The first cross-border RMB-denominated (Chinese currency) blockchain-based letter of credit transaction in the world was another major milestone.

According to HSBC, it assisted Shenzhen MTC Company Limited in completing the world’s first cross-border RMB-denominated blockchain-based LC transaction. This was also the first blockchain LC in which both clients were based in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA).

The live transaction involved Hong Kong-based MTC Electronic Company Limited exporting a shipment of raw materials to its parent company, Shenzhen MTC, using Voltron, a shared blockchain platform.

Instead of the Contour platform, this transaction used Voltron, which I mentioned earlier. Voltron was co-founded by eight member banks globally.

In this case, HSBC Shenzhen branch issued a digitized letter of credit on behalf of MTC to HSBC Hong Kong (on behalf of MTC). HSBC Hong Kong then reviewed, verified, and uploaded the required trade documents to the platform, completing the transaction in just 24 hours, compared to 5–10 days using traditional paper-based documents.

This is another excellent example that highlights the growing use of blockchain-based letters of credit, even for domestic transactions.

In another case, HSBC carried out Bangladesh’s first blockchain letter of credit transaction. The Bangladesh arm of HSBC, one of the world’s largest banks, completed the country’s first cross-border blockchain trade finance transaction, according to a press release on Tuesday.

The digitized LC transaction brought a notable reduction in processing time—from the traditional 5–10 days to under 24 hours. The bank described this as an important step for Bangladeshi companies toward the digitalization of trade.

The maiden transaction involved the import of 20,000 metric tons of fuel oil from Singapore by UMPL for a power station.

This transaction was carried out over the Trade Finance Network Contour, built on R3’s Corda Enterprise Blockchain technology.

There are now numerous examples like these, and an increasing number of banks are taking a strong interest in blockchain-based letters of credit.

With this trend, a growing demand is emerging for professionals skilled in both traditional LC operations and blockchain-based LC systems, as multinational banks and corporations seek experts to handle these advanced trade finance mechanisms.

Friends, in this course, the main idea was to help you understand the basic concepts of blockchain—what it can do, its major applications, including cryptocurrencies like Bitcoin, and, most importantly, how blockchain is likely to revolutionize the way international business is conducted.

The focus has been on how micro, small, and medium enterprises (MSMEs) involved in exporting and importing can truly benefit from this technology, and on the need for more such solutions and platforms to emerge that can help exporters carry out their international operations fearlessly, at lower costs, and with greater speed—ensuring importer satisfaction, repeat orders, and stronger trust between buyers and sellers.

In this course, which is a foundational program, my effort has been to make you understand these concepts clearly, so that in the future, if you wish to adopt blockchain technology or use the platforms already available, you will be confident in doing so.

In fact, some solutions based on smart contracts are already available. I encourage you to explore and research these platforms to understand how smart contracts work, how you can conduct your international operations using them, and how you can attract importers and buyers through blockchain-based platforms.

Observe the kind of response you receive, how you can expand your business, and how you can use blockchain platforms as marketing tools for your international trade.

With these words, I wish you the very best of luck in your future international business endeavors, and I hope you embrace new technologies to stay ahead.

If you liked this course, please refer it to your friends, relatives, and colleagues.

Also, if you found value in this course, I would be grateful if you could rate it and share your feedback.

Thank you very much.

Hello to you!

Today, I have some appreciative comments for you.

I want to take a moment to congratulate you on fully completing this course.

Your dedication and perseverance throughout this journey have been truly commendable. Completing a course is no small feat, and I am incredibly proud of the progress you have made and the knowledge you have gained along the way.

I also want to remind you that this course is just one piece of the puzzle. It is part of our larger VJ Export Mastery Courses series, consisting of 28 courses, as I had mentioned earlier. These courses are designed to provide you with a comprehensive understanding of the export industry.

On my part, as I have said before, I am committed to helping you expand your learning even further by providing access to more similar courses in the series. On your part, I have a small request as well.

Your feedback and rating are incredibly valuable in refining this course and ensuring it remains world-class.

I kindly ask you to leave a rating for the course along with your feedback, in case you have not done so yet.

Once again, congratulations on completing the course.

Keep up the fantastic work that you have done in this course, and remember, I am here to support you every step of the way.

Even after completing this course, please feel free to reach out to me anytime for any mentoring or support that you may need.

Thank you very much.

Here’s a curated list of international certification courses that can complement this Udemy course, "All About Blockchain, Bitcoin & Crypto for Exporters," and enhance your career prospects in blockchain, cryptocurrency, and their business applications globally:

Blockchain and Cryptocurrency Certifications

1. Certified Blockchain Professional (CBP) – Blockchain Council

   • Relevance: Covers blockchain fundamentals, business applications, and cryptocurrency mechanics.

   • Why Recommended: Aligns with topics like blockchain's role in international trade and smart contracts, enhancing credibility in blockchain consulting roles.

2. Certified Cryptocurrency Auditor (CCA) – Blockchain Council

   • Relevance: Focuses on cryptocurrency auditing and compliance, making it ideal for students looking to secure transactions or work with blockchain-based L/C solutions.

   • Why Recommended: Complements lectures on blockchain’s role in verification and mining processes.

3. Blockchain for Business – edX (offered by Linux Foundation)

   • Relevance: Explores blockchain applications in business, including global supply chains and trade finance.

   • Why Recommended: Ideal for topics like blockchain-based international marketplaces and letter of credit solutions.

4. Certified Enterprise Blockchain Professional (CEBP) – 101 Blockchains

   • Relevance: Focuses on blockchain’s business applications in trade, supply chains, and finance.

   • Why Recommended: Helps students integrate blockchain into their businesses, especially exporters.

5. Certified Blockchain and Supply Chain Professional (CBSP) – Blockchain Council

   • Relevance: Specializes in applying blockchain to supply chain management and trade operations.

   • Why Recommended: Ties directly to international trading applications discussed in the course.

Cryptocurrency and Bitcoin Certifications

1. Certified Bitcoin Professional (CBP) – Cryptocurrency Certification Consortium (C4)

   • Relevance: Provides a deep dive into Bitcoin's technicalities, history, and business use cases.

   • Why Recommended: Complements lectures on Bitcoin's origins, mining, and applications in global trade.

2. Certified Cryptocurrency Trader (CCT) – Blockchain Council

   • Relevance: Teaches cryptocurrency trading strategies and risk management.

   • Why Recommended: Supports topics like buying, selling, and managing cryptocurrencies for exporters.

3. Bitcoin and Cryptocurrency Technologies – Princeton University (Coursera)

   • Relevance: Explains cryptocurrency fundamentals, including Bitcoin's technical and economic aspects.

   • Why Recommended: Enhances understanding of Bitcoin's rise, mining, and hash functions.

International Trade and Blockchain Certifications

1. International Trade and Blockchain – ICC Academy

   • Relevance: Covers blockchain’s impact on trade finance and supply chains.

   • Why Recommended: Perfect for students interested in blockchain-based L/C solutions and international trade systems.

2. Trade Finance Certification – London Institute of Banking & Finance (LIBF)

   • Relevance: Explains trade finance, including blockchain’s role in modernizing it.

   • Why Recommended: Complements the comprehensive guide on blockchain-based letters of credit.

3. Certified Trade Finance Professional (CTFP) – ICC Academy

   • Relevance: Focuses on trade finance, blockchain applications, and risk management in global trade.

   • Why Recommended: Adds depth to understanding blockchain-based L/C cycles.

General Certifications on Emerging Technologies

1. Professional Certificate in Blockchain Fundamentals – UC Berkeley (edX)

   • Relevance: Introduces blockchain fundamentals and smart contract use cases.

   • Why Recommended: Enhances knowledge of blockchain’s revolutionary business applications.

2. Blockchain Strategy Programme – University of Oxford

   • Relevance: Focuses on high-level strategies for implementing blockchain in global businesses.

   • Why Recommended: Aligns with blockchain’s role for small exporters and online marketplaces.

Emerging Innovations Certifications

1. Certified Blockchain Expert (CBE) – Blockchain Council

   • Relevance: Covers advanced blockchain applications, including trade finance and innovative uses.

   • Why Recommended: Helps explore research-based topics on blockchain innovations.

2. Smart Contract Developer Certification – ConsenSys Academy

   • Relevance: Focuses on developing and implementing smart contracts.

   • Why Recommended: Complements discussions on blockchain’s role in smart eCommerce and IoT.

These certifications will help you specialize in blockchain and cryptocurrency technologies, giving you practical skills and theoretical insights to excel in international business contexts.

In the next lectures, I have provided a practice test as an example for appearing for the Certified Blockchain Professional (CBP) exam.

Here is the proposed Practice Test Structure, based on the topics covered in this course:

Practice Test: Certified Blockchain Professional (CBP) Preparation

Test Duration: 90 minutes
Total Questions: 50
Passing Score: 70%

Section 1: Blockchain Fundamentals

(10 Questions | 20 Marks)

• Focuses on the basics of blockchain technology, including its origins, characteristics, and philosophy.

1. Multiple Choice (3 questions)
   Example:
   Q: Which of the following best describes blockchain?

   • (a) A centralized ledger system

   • (b) A distributed and immutable ledger system

   • (c) A traditional database technology

   • (d) A peer-to-peer network without consensus

   Answer: (b)
   Explanation: Blockchain is a distributed ledger that ensures immutability and transparency through consensus mechanisms.

2. Fill in the Blanks (2 questions)
   Example:
   Q: The Bitcoin blockchain uses the __________ algorithm to ensure data security.
   Answer: SHA-256

3. True/False (2 questions)
   Example:
   Q: Blockchain is always dependent on cryptocurrency.
   Answer: False

4. Short Answer (3 questions)
   Example:
   Q: Explain the role of Byzantine Fault Tolerance (BFT) in blockchain networks.
   Answer: BFT ensures that a blockchain network can achieve consensus even when some nodes behave maliciously or fail.

Section 2: Business Applications of Blockchain

(15 Questions | 30 Marks)

• Examines how blockchain is applied in global trade, supply chains, and smart contracts.

1. Scenario-Based (3 questions)
   Example:
   Q: Imagine you are a small exporter using blockchain for payment processing. How would it enhance transaction transparency?
   Answer: Blockchain creates a transparent and tamper-proof record of transactions, ensuring clarity for all parties involved.

2. Multiple Selection (4 questions)
   Example:
   Q: Select all the benefits of blockchain in supply chain management:

   • Improved traceability

   • Centralized record-keeping

   • Reduced fraud

   • Increased manual interventions

   Answer: Improved traceability, Reduced fraud

3. True/False (3 questions)
   Example:
   Q: Blockchain eliminates all intermediaries in the supply chain.
   Answer: False

4. Descriptive (5 questions)
   Example:
   Q: Describe the advantages of using blockchain-based Letter of Credit (L/C) solutions compared to traditional methods.
   Answer: Advantages include reduced processing time, elimination of intermediaries, enhanced transparency, and improved security.

Section 3: Blockchain and Cryptocurrencies

(10 Questions | 20 Marks)

• Explores the mechanics, economics, and characteristics of cryptocurrencies.

1. Multiple Choice (4 questions)
   Example:
   Q: Which of the following factors contributes to Bitcoin’s value?

   • (a) Central bank regulation

   • (b) Limited supply

   • (c) Government subsidies

   • (d) Inflation adjustments

   Answer: (b)

2. Short Answer (2 questions)
   Example:
   Q: What role does a hash function play in cryptocurrency mining?
   Answer: Hash functions ensure data integrity and secure transactions by creating unique, fixed-length representations of input data.

3. Fill in the Blanks (2 questions)
   Example:
   Q: __________ is the process used to add new transactions to the blockchain ledger in Bitcoin.
   Answer: Mining

4. True/False (2 questions)
   Example:
   Q: Bitcoin transactions can be reversed once confirmed.
   Answer: False

Section 4: Security and Ethics in Blockchain

(10 Questions | 20 Marks)

• Addresses security concerns, ethical issues, and misuse scenarios.

1. Multiple Choice (3 questions)
   Example:
   Q: Which of the following is a primary security risk in blockchain?

   • (a) Smart contracts

   • (b) 51% attack

   • (c) Proof-of-stake

   • (d) Decentralized consensus

   Answer: (b)

2. Case Study Analysis (2 questions)
   Example:
   Q: Analyze the “200 Million $ Pizza Problem.” What ethical concerns does it highlight?
   Answer: The incident highlights issues with valuation volatility and the potential for misuse of cryptocurrencies due to their lack of standardized pricing mechanisms.

3. Fill in the Blanks (2 questions)
   Example:
   Q: A __________ attack occurs when a single entity gains control over 51% of a blockchain network's computing power.
   Answer: 51%

4. True/False (3 questions)
   Example:
   Q: Blockchain is immune to all types of cyberattacks.
   Answer: False

Section 5: Advanced Blockchain Topics

(5 Questions | 10 Marks)

• Tests knowledge of advanced topics such as mining algorithms, proof-of-work, and consensus mechanisms.

1. Multiple Choice (2 questions)
   Example:
   Q: What does proof-of-work (PoW) primarily achieve in blockchain?

   • (a) Ensures data encryption

   • (b) Prevents double-spending

   • (c) Reduces mining costs

   • (d) Enhances network centralization

   Answer: (b)

2. Short Answer (2 questions)
   Example:
   Q: What is the role of SHA-256 in Bitcoin mining?
   Answer: SHA-256 generates unique hashes for transactions, ensuring their security and helping miners validate new blocks.

3. True/False (1 question)
   Example:
   Q: Proof-of-stake (PoS) consumes more energy than proof-of-work (PoW).
   Answer: False

This mock test ensures students get hands-on practice with concepts they need for the CBP certification while leveraging the knowledge gained from this course.

Hello and welcome, and thank you so much for completing this amazing course.

I truly appreciate the time and effort you have invested in developing all types of skills, whether related to export documentation, compliance, international regulations, logistics, or global marketing strategies.

In this short bonus video lecture, I want to share with you a few optional ways you can continue your learning journey, access additional resources, and stay connected with me for future guidance, all while remaining fully compliant with Udemy policies.

If you want to continue receiving educational content on exports, global compliance updates, HS code classification tips, EU/US regulations, logistics strategies, and real-world case studies, you are welcome to connect with me on LinkedIn.

I regularly post export-related insights, free updates, and practical examples that many learners find very useful.

Again, this is completely optional, but if you would like to connect, this is my LinkedIn profile: LinkedIn.com/in/vijeshjain. Along with my activities on LinkedIn, YouTube, Instagram, and many other social media platforms, I frequently share publicly available articles, guidance notes, and updates related to topics such as documentation and compliance, Indian and international customs rules, labeling requirements, global market trends, and policy changes in the EU, USA, UK, and Middle Eastern regions, as well as best practices for exporters.

These free resources can help you stay informed and confident as your export business grows.

For learners who need personalized clarity on specific export matters, such as HS decisions, regulatory compliance, product classifications, labeling reviews, customs queries, international market strategies, or even Amazon US product launch advisory, I also provide such guidance outside Udemy.

If you ever require any of this tailor-made support, you may contact me directly. My email ID is vijesshjain@gmail.com.

Please note that this is only an optional way to reach me outside Udemy, and it is not required to complete this course. It is also not part of the Udemy purchase for this course, which keeps this message fully compliant with Udemy policies.

In addition, I want to cordially invite you to my Discord Knowledge Hub, which has several channels, including the Q&A section, discussion channel, discussion lounge, video lectures channel, and announcement channel. No registration is required to access this knowledge hub or any of these channels.

Simply click the invite link, which is also provided in the resource section of this lecture, and you can access my Discord Knowledge Hub.

Before I close, I want to sincerely thank you once again for joining this course.

I truly hope that this specialized training has added real value to your knowledge base and to your professional journey in international trade.

My mission is to help learners navigate exports more confidently, whether it is compliance, export documentation, import documentation, logistics, or expanding into global markets.

I wish you tremendous success in your future business endeavors, and I look forward to staying connected with you on your path ahead.

Thank you once again, and all the best in your international journey.

Take care of yourself, and see you in another course in this course series.

Dear Learner,

Thank you for completing this course. I appreciate your time, dedication, and interest in strengthening your knowledge of export documentation, compliance, HS classification, logistics, and global market strategy.

This Bonus Section offers optional ways to continue your learning journey, stay connected, and access additional guidance outside Udemy.
Everything here is completely optional, not required to complete the course, and not included in your Udemy purchase, in full compliance with Udemy policies.

1. Connect With Me on LinkedIn (Optional)

If you'd like to follow my educational posts, updates, and insights on global trade, compliance, and international markets, you can connect with me on LinkedIn:

LinkedIn (Optional):
https://www.linkedin.com/in/vijeshjain/

I regularly share free content, industry news, case studies, and compliance tips useful for exporters and global professionals.

2. Visit My Udemy Instructor Profile (Optional)

If you’d like to explore more of my courses on international trade and global business:

Udemy Instructor Profile (Optional):
https://www.udemy.com/user/vijesh-jain-4/

You can browse additional courses, all focused on simplifying global trade and helping professionals succeed in international markets.

3. Optional Personalized Guidance Outside Udemy

If you ever need individual clarity on export documentation, HS code decisions, customs queries, EU/US/UK/UAE compliance, labeling reviews, market-entry strategy, or Amazon USA marketplace compliance, you may reach out to me directly:

Email (Optional):
vijeshjain@gmail.com

Additional Educational Video Resources at YouTube: https://www.youtube.com/@VijeshJain0506

This is only an optional way to connect and is not required for completing the course.

4. Join the Free Discord Knowledge Hub (No Signup Required)

To support continuous learning, I’ve created an open-access Discord Knowledge Hub for all students.
You can join anytime to access discussions, free resources, shared insights, and regular updates.

Join Discord Knowledge Hub (Optional, No Registration Required):
https://discord.gg/wHgqdYe6tz

This community is free, optional, and designed to help learners share knowledge and stay updated with global trade trends.

5. Free Public Resources for Ongoing Learning

I regularly share publicly accessible updates on topics such as:

• HS classification best practices

• Compliance rules for the USA, EU, UK, and UAE

• Labeling and documentation tips

• Customs procedures

• Market-entry insights

• Global trade risks and opportunities

These resources are available on my social channels and are fully free for learners.

You can also join my optional LinkedIn Newsletter - The Management Playbook at

https://www.linkedin.com/newsletters/the-management-playbook-7065900250162483200/

Thank You & Best Wishes

Thank you once again for learning with me. I hope this course has added clarity and confidence to your global trade journey. I look forward to staying connected and supporting your continued growth.

Wishing you success in all your international business endeavors.

Warm regards,
Vijesh Jain
Export–Import Consultant & Trainer
VJ Global Academy