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This exercise leverages the Bitcoin Development Kit (BDK) to construct a functional wallet module, utilizing its HD wallet capabilities (BIP32/84), SPV blockchain synchronization, and descriptor-based scripts. You’ll implement this in either Python (via `bdkpython`) or JavaScript (via `@bitcoinerlab/bdk`), targeting Bitcoin’s testnet. The goal is to deepen your understanding of BDK’s application in real-world wallet development while engaging with live blockchain data.", + "main": "index.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "dependencies": { + "axios": "^1.8.4", + "bdk": "^0.0.0", + "bip32": "^5.0.0-rc.0", + "bip39": "^3.1.0", + "bitcoinjs-lib": "^6.1.7", + "ecpair": "^3.0.0", + "tiny-secp256k1": "^2.2.3" + } +} diff --git a/wallet.js b/wallet.js new file mode 100644 index 0000000..f53f5ec --- /dev/null +++ b/wallet.js @@ -0,0 +1,73 @@ +const bip39 = require('bip39'); +const bitcoin = require('bitcoinjs-lib'); +const { ECPairFactory } = require('ecpair'); +const ecc = require('tiny-secp256k1'); +const BIP32Factory = require('bip32').default; +const axios = require('axios'); + +const ECPair = ECPairFactory(ecc); +const bip32 = BIP32Factory(ecc); + +// Generate mnemonic seed +console.log("Generating mnemonic seed..."); +// const mn = bip39.generateMnemonic(); +const mn = "vault appear distance recipe decorate crawl aunt polar grit inject obey ribbon"; +console.log(`Mnemonic: ${mn}`); + +// Derive seed from mnemonic +const seed = bip39.mnemonicToSeedSync(mn); +const root = bip32.fromSeed(seed, bitcoin.networks.testnet); + +// BIP84 (SegWit) Derivation +const childNode = root.derivePath("m/84'/1'/0'/0/0"); +const keyPair = ECPair.fromPrivateKey(childNode.privateKey, { network: bitcoin.networks.testnet }); +const { address } = bitcoin.payments.p2wpkh({ pubkey: Buffer.from(keyPair.publicKey), network: bitcoin.networks.testnet }); +console.log(`Generated SegWit Address: ${address}`); + +// Alternative BIP44 (P2PKH) Derivation +const childNodeBIP44 = root.derivePath("m/44'/1'/0'/0/0"); +const keyPairBIP44 = ECPair.fromPrivateKey(childNodeBIP44.privateKey, { network: bitcoin.networks.testnet }); +const { address: p2pkhAddress } = bitcoin.payments.p2pkh({ pubkey: Buffer.from(keyPairBIP44.publicKey), network: bitcoin.networks.testnet }); +console.log(`Generated P2PKH Address: ${p2pkhAddress}`); + +// Fetch balance +async function getBalance(address) { + try { + const response = await axios.get(`https://blockstream.info/testnet/api/address/${address}`, { timeout: 30000 }); + console.log("Balance Information:", response.data.chain_stats); + } catch (error) { + if (error.code === 'ECONNABORTED') { + console.error("Error fetching balance: Request timed out."); + } else { + console.error("Error fetching balance:", error.message); + } + } +} + +// Retrieve transaction history +async function getTransactionHistory(address) { + try { + const res = await axios.get(`https://blockstream.info/testnet/api/address/${address}/txs`, { timeout: 30000 }); + if (res.data.length === 0) { + console.log("No transactions found."); + } else { + console.log("Transaction History:"); + res.data.forEach((tx, index) => { + console.log(`TX ${index + 1}: ID: ${tx.txid}, Confirmed: ${tx.status.confirmed}`); + }); + } + } catch (error) { + if (error.code === 'ECONNABORTED') { + console.error("Error fetching transactions: Request timed out."); + } else { + console.error("Error fetching transactions:", error.message); + } + } +} +(async () => { + console.log("\nFetching balance for SegWit Address..."); + await getBalance(address); + + console.log("\nFetching transaction history for SegWit Address..."); + await getTransactionHistory(address); +})(); diff --git a/wallet.txt b/wallet.txt new file mode 100644 index 0000000..ae49a39 --- /dev/null +++ b/wallet.txt @@ -0,0 +1,5 @@ +SegWit Address: tb1q7mqncv402snvnu08qcrwu7535dr0ea89sjxk95 +P2PKH Address: mtn2tore4eaKh8ncFz7fTsyXnjPUqpwdhw +Total Balance: 1300 satoshis (0.00001300 BTC) +TXID: 0b8c47a9a6b7cc347ca50ac447c937749eccc3ebb5b276fa8a11068d700bdfc6 +