diff --git a/.gitignore b/.gitignore index 2895fff..b90ee35 100644 --- a/.gitignore +++ b/.gitignore @@ -102,3 +102,5 @@ ENV/ # PyCharm .idea/ + +node_modules/ diff --git a/js/blockchain.js b/js/blockchain.js new file mode 100644 index 0000000..79c9b1b --- /dev/null +++ b/js/blockchain.js @@ -0,0 +1,95 @@ +const crypto = require("crypto"); + + +class Blockchain { + constructor() { + this.chain = []; + this.pendingTransactions = []; + this.newBlock(); + } + + /** + * Creates a new block containing any outstanding transactions + * + * @param previousHash: the hash of the previous block + * @param nonce: the random string used to make this block hash satisfy the difficulty requirements + */ + newBlock(previousHash, nonce = null) { + let block = { + index: this.chain.length, + timestamp: new Date().toISOString(), + transactions: this.pendingTransactions, + previousHash, + nonce + }; + + block.hash = this.hash(block); + + console.log(`Created block ${block.index}`); + + // Add the new block to the blockchain + this.chain.push(block); + + // Reset pending transactions + this.pendingTransactions = []; + } + + /** + * Generates a SHA-256 hash of the block + * @param block + */ + hash(block) { + const blockString = JSON.stringify(block, Object.keys(block).sort()); + return crypto.createHash("sha256").update(blockString).digest("hex"); + } + + /** + * Gets the last block in the chain + */ + lastBlock() { + return this.chain.length && this.chain[this.chain.length - 1]; + } + + /** + * Determines if a hash begins with a "difficulty" number of 0s + * + * @param hashOfBlock: the hash of the block (hex string) + * @param difficulty: an integer defining the difficulty + */ + powIsAcceptable(hashOfBlock, difficulty) { + return hashOfBlock.slice(0, difficulty) == "0".repeat(difficulty); + } + + /** + * Generates a random 32 byte string + */ + nonce() { + return crypto.createHash("sha256").update(crypto.randomBytes(32)).digest("hex"); + } + + /** + * Proof of Work mining algorithm + * + * We hash the block with random string until the hash begins with + * a "difficulty" number of 0s. + * + * @param _block: the block to be mined (defaults to the last block) + * @param difficulty: the mining difficulty to use + */ + proofOfWork(_block = null, difficulty = 4) { + const block = _block || this.lastBlock(); + + while (true) { + block.nonce = this.nonce(); + if (this.powIsAcceptable(this.hash(block), difficulty)) { + console.log("We mined a block!") + console.log(` - Block hash: ${this.hash(block)}`); + console.log(` - nonce: ${block.nonce}`); + return block; + } + } + } +} + +const blockchain = new Blockchain(); +blockchain.proofOfWork(null, 5); diff --git a/js/package-lock.json b/js/package-lock.json new file mode 100644 index 0000000..8225585 --- /dev/null +++ b/js/package-lock.json @@ -0,0 +1,2262 @@ +{ + "name": "blockchain", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "abbrev": { + "version": "1.1.1", + "resolved": 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