Golang: How to Build a Blockchain in Go Guide

Demonstrate sending bitcoin via a blockchain network by illustrating a transfer from Amy to James, including wallets, verification, and transaction confirmation.

Understand how blockchain records transactions in blocks linked by hashes across many servers, and how mining with nonce yields rewards, forming a chain that is difficult to hack.

Start a Go blockchain project, create the main Go file, configure build, and use debugging and logging with a blockchain prefix.

Create and print a blockchain block in Go by defining a block structure with timestamp, previous hash, nonce, and transactions, then mine and add it to the chain.

Define a blockchain struct in Go, including a transaction pool and chain; implement create block and new blockchain, append blocks, and print the chain.

Learn to compute a block hash in Go by hashing a JSON-marshaled block with sha256, link blocks via previous hashes, and customize marshal casing to ensure stable hashes.

Create and manage a transaction pool in a Go blockchain by defining a transaction struct, adding transactions with sender and recipient addresses, and moving them into blocks for recording.

Explore proof of work, consensus algorithm, and nonce values that validate transactions. Compute hashes using the previous hash and adjust the nonce to yield leading zeros for the block.

Derive the nonce by implementing a proof-of-work in Go, using a mining difficulty of three, copying the transaction pool, and validating hashes with leading zeros to advance the blockchain.

Explore mining in a Go blockchain, including registering a blockchain address and issuing a one point zero reward per block. Learn how nonce and proof-of-work create blocks and rewards.

Implement a calculate total amount function in a Go blockchain by iterating transactions from zero, updating the total based on recipient and sender, and accounting for miner rewards.

Generate private and public keys in wallets to sign and verify transactions, derive blockchain addresses from the public key, and learn elliptic curve digital signature algorithm on a 256-bit curve.

Organize the Go blockchain project by creating block and wallet folders and generating a private key and public key pair with elliptic curve p-256.

Learn to convert a long public key into a shorter, secure blockchain address by applying nine rules inspired by bitcoin address construction, using SHA256 and AMD 160.

Run go get to fetch two packages, then create a blockchain address by hashing a public key with sha256 and ripemd160 to form a 21-byte address with version and checksum.

Create a transaction struct and generate a signature from the sender private key and RSA public key, hashing the transaction with sha256 to secure sender, recipient, and value.

Verify transactions in a Go blockchain by using a signature verification workflow with sender public key, recipient key, and signature, then add valid transactions to the pool and mine rewards.

Launch a Go web server to run three blockchain nodes via distinct ports, implement rest APIs for data transmission, and test with Hello world responses.

Create a blockchain api that serves blockchain data via get blockchain, caches blocks, registers miner wallet and port, marshals blocks to json, and exposes chain information through the api.

Launch a Go wallet server to accept client payment requests, serve an HTML index template, and expose a gateway endpoint on port 8080 to connect with the blockchain node.

Create a wallet UI in the go blockchain course using HTML and jQuery, with public key, private key, blockchain address, recipient address, amount, and a reload wallet control.

Integrate a Go backend with a browser frontend to create and display a wallet, returning public key, private key, and blockchain address in JSON via POST.

Users send transactions via the wallet user interface by posting to backend API, including sender and recipient addresses, sender public key, and amount, with user confirmation and JSON status responses.

Decode json data in Go backend using json.NewDecoder, define a transaction request struct, validate fields, and process front-end transaction data for a blockchain wallet.

Decode hex strings into ecdsa public and private keys in Go, building utils to parse X and Y, and signatures for blockchain transaction handling.

Post the transaction data from the wallet to the blockchain node via http post. Create a transaction request with sender and recipient addresses, public key, value, and signature.

Create the transaction API for the blockchain server, handle POST requests and JSON decoding to add transactions. Expose GET transactions and transaction pool endpoints for the web UI.

Create a mining api to mine pending transactions into a new block, move transactions from the pool into the blockchain, and reward the miner.

Automate mining in the Go blockchain by adding a timer and locks, running periodic mining when the transaction pool exists and adjusting difficulty with a valid proof.

Create a go backend api endpoint /amount that reads a blockchain address from a get query, calculates the total cryptocurrency for that address, and returns it as json.

Develop a Go API that lets the wallet server fetch the blockchain node's amount via a GET request with a blockchain address and return it to the frontend.

Build the UI to display cryptocurrency totals by sending blockchain addresses to the backend with Ajax, parsing JSON responses for the wallet amount, and enabling automatic refresh every three seconds.

Explore discovering nearby blockchain nodes using rest for data transmission, implement an is_found host check with dial timeout, and build a find neighbors routine for IP and port ranges.

Automatically register nearby blockchain nodes by configuring port ranges and neighbor IP ranges, retrieving the host IP, and refreshing neighbors every 20 seconds.

This section covers synchronizing transactions across blockchain nodes by updating, deleting, and broadcasting transactions via a REST-based API, verifying signatures, updating transaction pools, and clearing pools after mining.

Explore how consensus governs blockchain stability by validating blocks, mining with nonces, and sharing the longest chain across nodes to replace shorter alternatives, boosting trust.

Verify new blocks by checking the previous hash, nonce, and transactions, then validate the entire chain with a valid proof and mining difficulty.

Learn to resolve conflicts using the longest-chain rule by fetching and verifying peer chains, then replacing the local chain with the longer, valid one to achieve consensus.

Create and register a consensus api that resolves conflicts across blockchain nodes, updates the local chain, and coordinates with peers via consensus requests, mining, and transaction validation.

Explore how a fifty one percent attack lets a hacker with majority computing power alter the blockchain, double-spend, and influence exchanges by creating the longest valid chain.

Demonstrate a complete end-to-end blockchain workflow in Go by simulating wallet creation, mining rewards, and sending crypto between wallets through a live demo.