Learn Blockchain Development with Node.js and Solidity

learn how cryptocurrency relates to blockchain, how blocks are mined and rewarded, and how sha-256 hashing with digital signatures secures a shared ledger.

Explore how mining uses proof of work to find low-hash blocks by hashing block data with nonces, earning rewards and securing the blockchain through consensus and Byzantine fault tolerance.

Wallets store public and private keys for cryptocurrency transactions; passwords become a hashed account ID, the private key stays secret, and the public key enables payments via sha 2256.

Explore how blockchain prevents double spend by using node confirmations and consensus to ensure atomicity, consistency, isolation, and durability, avoiding conflicting transactions.

Explore blockchain development with node.js and solidity by setting up NestJS with TypeScript, installing node.js, creating a NestJS project, and running with npm start.

Explore how to scaffold and run a Next.js and NestJS project locally with npm, and understand the event-driven, single-threaded Node.js flow behind API routes, controllers, and services for blockchain development.

Set up environment files and node configuration for a blockchain app, parse environment variables, and enable dynamic multi-node operation using a NestJS config module.

Learn how to initialize a blockchain database, define the blocks data model, validate and organize block data, and seed a genesis block for a functional blockchain.

Learn to run a blockchain app, set up the blockchain service, generate the genesis block, and create APIs to fetch blocks by hash, index, and last block using Next.js.

Develop wallet functionality by building a wallet service, wallet data, and APIs to create, read, and fetch wallets by id, with password hash and sha256.

Build a key pairs system for wallets by generating secret and public keys via elliptic curves, using password-based key derivation and organizing key pairs in a wallet array.

Explore linking a password hash to a wallet's public/private key pairs by generating addresses, validating the wallet password via headers, and exposing post APIs to create and manage keys.

Create a transaction class with a hash id and types like mined, reward, payment, and fee, and model input-output data and merkle-tree based storage.

Learn to verify blockchain transactions by checking that input and output amounts match, generating and validating the transaction hash, and verifying signatures with the Edwards elliptic curve across nodes.

Implement a get balance API that computes a wallet’s balance by aggregating unspent transactions (utxo) across blocks and transactions for a given address.

Explore how to compute a wallet balance by deriving unspent transactions from input and output data, filtering duplicates, and summing amounts in a blockchain with node.js.

Develop a post API to initiate blockchain transactions using node.js, validating wallet password from headers, and securely creating and saving transactions with unspent input checks to prevent double spending.

Verify blockchain integrity by implementing a chain check function that validates genesis block, indices, hashes, difficulty, and transactions, including balance and double spending checks across nodes.

Develop the node controller to handle communication between nodes, broadcasting new blocks and transactions to peers for validation. Implement updates with check received block and replace chain.

Expose blockchain APIs for transactions and wallet addresses, including wallet ID, and implement an amateur service using a shared event emitter to broadcast between nodes, preparing for mining.

Define a mining controller with a post api to mine new blocks, flatten transactions, perform proof-of-work with difficulty, add blocks, and broadcast updates to nodes.

Build a mining controller that creates a block from previous block, processes transactions with selected and rejected lists, applies fees and mining rewards, and prepares proof of work and broadcast.

Establish cross-node blockchain communication by broadcasting block and transaction updates via an emitter, and synchronize peers using HTTP requests, block retrieval, and transaction confirmation checks.

Test and debug blockchain APIs, mine blocks, manage wallets and transactions, and validate blocks across a multi-node network using Node.js and Solidity concepts.

Create an Angular wallet user interface that connects to a blockchain backend, enabling password-based account creation, block mining, and cryptocurrency transfers, while highlighting Angular's component structure and TypeScript workflow.

Explore seven blockchain design principles: networked integrity, distributed power, value as incentive, security and safety measures, no identity requirement, ownership rights, and inclusion, driving trust and open participation.

Explore how Ethereum enables smart contracts and decentralized applications through Solidity, gas, and the Ethereum Virtual Machine, contrasting with Bitcoin's script and proof-of-work history.

Understand how smart contracts enable trustless, distributed code execution on the blockchain. See conditional fund releases and immutability in action, illustrated by a crowd-funding example.

Explore Solidity basics by creating a simple smart contract in Remix, with a uint value, a public constructor, getter and setter, and local deployment testing.

Build a Solidity contract that maps uint to a person struct, with an add function and an owner-controlled constructor.

Explore decentralized applications on blockchain, and compare public, private, permissioned, and hybrid cryptocurrencies with real projects like Ripple, XRP, and Binance.