wallet.ts

A collection of utilities for building cryptocurrency wallets, written in TypeScript. Requires Node.js 12.0.0+.

Hierarchical Deterministic Wallets (BIP 32)

const { randomBytes } = require("crypto");
const { HDKey } = require("wallet.ts");
 
const seed = randomBytes(66);
 
const masterKey = HDKey.parseMasterSeed(seed);
// => HDKey {...}
 
const extendedPrivateKey = masterKey.derive("m/44'/60'/0'/0")
  .extendedPrivateKey;
// => "xprvA2FBfTJAyLjF5..."
 
const childKey = HDKey.parseExtendedKey(extendedPrivateKey);
// => HDKey {...}
 
const wallet = childKey.derive("0");
// => HDKey {...}
 
const walletPrivateKey = wallet.privateKey;
// => <Buffer 44 04 ce 4a ...>
 
const walletPublicKey = wallet.publicKey;
// => <Buffer 03 e9 f6 10 ...>

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Mnemonic code for generating deterministic keys (BIP 39)

const { randomBytes } = require("crypto");
const { Mnemonic } = require("wallet.ts");
 
const mnemonic = Mnemonic.generate(randomBytes(32));
// => Mnemonic {...}
 
const phrase = mnemonic.phrase;
// => "capital find public couple ..."
 
const words = mnemonic.words;
// => [ "capital", "find", "public", "couple", ...]
 
const seed = mnemonic.toSeed();
// => <Buffer cd 07 60 43 ...>

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Ethereum Address / EIP 55 checksum

const { EthereumAddress } = require("wallet.ts");
 
const publicKey = Buffer.from(
  "028a8c59fa27d1e0f1643081ff80c3cf0392902acbf76ab0dc9c414b8d115b0ab3",
  "hex"
);
 
const address = EthereumAddress.from(publicKey).address;
// => "0xD11A13f484E2f2bD22d93c3C3131f61c05E876a9"
 
const valid = EthereumAddress.isValid(address);
// => true
 
const checksumAddress = EthereumAddress.checksumAddress(
  "0xd11a13f484e2f2bd22d93c3c3131f61c05e876a9"
);
// => "0xD11A13f484E2f2bD22d93c3C3131f61c05E876a9"

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Bitcoin Address (deprecated)

const { BitcoinAddress } = require("wallet.ts");
 
const publicKey = Buffer.from(
  "0250863ad64a87ae8a2fe83c1af1a8403cb53f53e486d8511dad8a04887e5b2352",
  "hex"
);
 
const address = BitcoinAddress.from(publicKey).address;
// => "1PMycacnJaSqwwJqjawXBErnLsZ7RkXUAs"
 
const valid = BitcoinAddress.isValid(address);
// => true

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