JavaScriptSolidServer/src/token.js at issue-179-withdraw · JavaScriptSolidServer/JavaScriptSolidServer · GitHub

Repository navigation

History

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

/**

* MRC20 Token Management

* Create, manage, and transfer MRC20 tokens anchored to Bitcoin via blocktrails.

* Uses BIP-341 key chaining to derive unique taproot addresses for each state.

* Trail state stored at: {DATA_ROOT}/.well-known/token/{ticker}.json

* References:

* - Blocktrails: https://blocktrails.org/

* - BIP-341: https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki

import crypto from 'crypto';

import fs from 'fs-extra';

import path from 'path';

import { secp256k1, schnorr } from '@noble/curves/secp256k1';

import { jcs, sha256Hex, btAddress } from './mrc20.js';

// --- Constants ---

const SECP_N = BigInt('0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141');

const MRC20_PROFILE = 'mono.mrc20.v0.1';

// --- Byte helpers ---

function hexToU8(hex) {

const bytes = new Uint8Array(hex.length / 2);

for (let i = 0; i < bytes.length; i++) bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);

return bytes;

}

function bytesToHex(bytes) {

return Array.from(bytes).map(b => b.toString(16).padStart(2, '0')).join('');

}

function bytesToBigInt(bytes) {

let r = 0n;

for (const b of bytes) r = (r << 8n) | BigInt(b);

return r;

}

function bigIntToBytes(n) {

return hexToU8(n.toString(16).padStart(64, '0'));

}

function concatBytes(...arrays) {

const total = arrays.reduce((s, a) => s + a.length, 0);

const result = new Uint8Array(total);

let off = 0;

for (const a of arrays) { result.set(a, off); off += a.length; }

return result;

}

// --- Serialization helpers ---

function writeU32LE(val) {

const b = new Uint8Array(4);

b[0] = val & 0xff; b[1] = (val >> 8) & 0xff; b[2] = (val >> 16) & 0xff; b[3] = (val >> 24) & 0xff;

return b;

}

function writeU64LE(val) {

const b = new Uint8Array(8);

const n = BigInt(val);

for (let i = 0; i < 8; i++) b[i] = Number((n >> BigInt(i * 8)) & 0xffn);

return b;

}

function writeVarInt(val) {

if (val < 0xfd) return new Uint8Array([val]);

if (val <= 0xffff) return new Uint8Array([0xfd, val & 0xff, (val >> 8) & 0xff]);

throw new Error('VarInt too large');

}

function reverseTxid(txidHex) {

const bytes = hexToU8(txidHex);

bytes.reverse();

return bytes;

}

// --- Crypto ---

function sha256Bytes(data) {

const buf = data instanceof Uint8Array ? Buffer.from(data) : Buffer.from(data, 'utf8');

return new Uint8Array(crypto.createHash('sha256').update(buf).digest());

}

function taggedHash(tag, ...msgs) {

const tagHash = sha256Bytes(Buffer.from(tag, 'utf8'));

return sha256Bytes(concatBytes(tagHash, tagHash, ...msgs));

}

// --- BIP-341 key chaining ---

function btScalar(pubkeyCompressed, state) {

const xOnly = pubkeyCompressed.slice(1);

const stateBytes = typeof state === 'string' ? Buffer.from(state, 'utf8') : state;

const sh = sha256Bytes(stateBytes);

return bytesToBigInt(taggedHash('TapTweak', xOnly, sh)) % SECP_N;

}

function btDeriveChainedPubkey(pubkeyBase, states) {

let P = secp256k1.ProjectivePoint.fromHex(bytesToHex(pubkeyBase));

let cur = pubkeyBase;

for (const s of states) {

const t = btScalar(cur, s);

P = P.add(secp256k1.ProjectivePoint.BASE.multiply(t));

cur = new Uint8Array(P.toRawBytes(true));

}

return cur;

}

function btDeriveChainedPrivkey(privkeyBytes, states) {

let d = bytesToBigInt(privkeyBytes);

let cur = new Uint8Array(secp256k1.getPublicKey(privkeyBytes, true));

for (const s of states) {

const t = btScalar(cur, s);

d = (d + t) % SECP_N;

cur = new Uint8Array(secp256k1.ProjectivePoint.BASE.multiply(d).toRawBytes(true));

}

return bigIntToBytes(d);

}

function p2trScript(xonly) {

return concatBytes(new Uint8Array([0x51, 0x20]), xonly);

}

// --- Bitcoin transaction building ---

function buildTransaction(inputs, outputs, privkeyBytes) {

const internalXOnly = new Uint8Array(secp256k1.getPublicKey(privkeyBytes, true)).slice(1);

const untweakedHex = '5120' + bytesToHex(internalXOnly);

const needsTweak = bytesToHex(inputs[0].scriptPubKey) !== untweakedHex;

let signingKey = privkeyBytes;

if (needsTweak) {

const tweak = taggedHash('TapTweak', internalXOnly);

const t = bytesToBigInt(tweak);

let d = bytesToBigInt(privkeyBytes);

const fullPub = secp256k1.getPublicKey(privkeyBytes, false);

if (fullPub[64] & 1) d = SECP_N - d;

signingKey = bigIntToBytes((d + t) % SECP_N);

}

const version = 2, locktime = 0, sequence = 0xfffffffd;

const serOutputs = outputs.map(o =>

concatBytes(writeU64LE(o.amount), writeVarInt(o.scriptPubKey.length), o.scriptPubKey)

);

const shaPrevouts = sha256Bytes(concatBytes(...inputs.map(i =>

concatBytes(reverseTxid(i.txid), writeU32LE(i.vout))

)));

const shaAmounts = sha256Bytes(concatBytes(...inputs.map(i => writeU64LE(i.amount))));

const shaScriptPubKeys = sha256Bytes(concatBytes(...inputs.map(i =>

concatBytes(writeVarInt(i.scriptPubKey.length), i.scriptPubKey)

)));

const shaSequences = sha256Bytes(concatBytes(...inputs.map(() => writeU32LE(sequence))));

const shaOutputs = sha256Bytes(concatBytes(...serOutputs));

const sigs = [];

for (let i = 0; i < inputs.length; i++) {

const sigMsg = concatBytes(

new Uint8Array([0x00, 0x00]),

writeU32LE(version), writeU32LE(locktime),

shaPrevouts, shaAmounts, shaScriptPubKeys, shaSequences, shaOutputs,

new Uint8Array([0x00]),

writeU32LE(i)

);

const sighash = taggedHash('TapSighash', sigMsg);

sigs.push(schnorr.sign(sighash, signingKey));

}

const parts = [

writeU32LE(version),

new Uint8Array([0x00, 0x01]),

writeVarInt(inputs.length)

];

for (const inp of inputs) {

parts.push(reverseTxid(inp.txid), writeU32LE(inp.vout), new Uint8Array([0x00]), writeU32LE(sequence));

}

parts.push(writeVarInt(outputs.length));

for (const so of serOutputs) parts.push(so);

for (const sig of sigs) {

parts.push(new Uint8Array([0x01]), writeVarInt(sig.length), sig);

}

parts.push(writeU32LE(locktime));

return bytesToHex(concatBytes(...parts));

}

async function broadcastTx(rawTxHex, mempoolUrl) {

const res = await fetch(`${mempoolUrl}/api/tx`, {

method: 'POST',

headers: { 'Content-Type': 'text/plain' },

body: rawTxHex

});

if (!res.ok) {

const err = await res.text();

throw new Error(`Broadcast failed: ${err}`);

}

return res.text();

}

// --- Trail persistence ---

function trailDir() {

return path.join(process.env.DATA_ROOT || './data', '.well-known', 'token');

}

function trailPath(ticker) {

return path.join(trailDir(), `${ticker.toLowerCase()}.json`);

}

export async function loadTrail(ticker) {

try {

const data = await fs.readFile(trailPath(ticker), 'utf8');

return JSON.parse(data);

} catch { return null; }

}

async function saveTrail(trail) {

await fs.ensureDir(trailDir());

await fs.writeFile(trailPath(trail.ticker), JSON.stringify(trail, null, 2));

}

export async function listTrails() {

try {

const files = await fs.readdir(trailDir());

const trails = [];

for (const f of files) {

if (f.endsWith('.json')) {

const data = await fs.readFile(path.join(trailDir(), f), 'utf8');

trails.push(JSON.parse(data));

}

return trails;

} catch { return []; }

}

// --- TXO URI parsing ---

export function parseTxoUri(uri) {

// txo:btc:txid:vout?amount=N&key=hex

const match = uri.match(/(?:txo:btc:)?([0-9a-f]{64}):(\d+)\?amount=(\d+)&key=([0-9a-f]{64})/i);

if (!match) throw new Error('Invalid TXO URI format');

return {

txid: match[1],

vout: parseInt(match[2], 10),

amount: parseInt(match[3], 10),

privkey: match[4]

};

}

// --- Mint: create genesis MRC20 token ---

export async function mintToken({ ticker, name, supply, voucher, mempoolUrl = 'https://mempool.space/testnet4', network = 'testnet4' }) {

const txo = parseTxoUri(voucher);

const privkeyBytes = hexToU8(txo.privkey);

const pubkeyBase = new Uint8Array(secp256k1.getPublicKey(privkeyBytes, true));

const pubkeyBaseHex = bytesToHex(pubkeyBase);

// Check if token already exists

const existing = await loadTrail(ticker);

if (existing) throw new Error(`Token ${ticker} already exists`);

// Create genesis MRC20 state

const genesisState = {

profile: MRC20_PROFILE,

prev: '0'.repeat(64),

seq: 0,

ticker,

decimals: 0,

supply,

balances: { [pubkeyBaseHex]: supply },

ops: []

};

const genesisJcs = jcs(genesisState);

// Derive genesis taproot address

const genesisP = btDeriveChainedPubkey(pubkeyBase, [genesisJcs]);

const genesisXonly = genesisP.slice(1);

const genesisScript = p2trScript(genesisXonly);

const genesisAddr = btAddress(pubkeyBaseHex, [genesisJcs], network);

// Fetch voucher scriptPubKey

const txResp = await fetch(`${mempoolUrl}/api/tx/${txo.txid}`);

if (!txResp.ok) throw new Error('Could not fetch voucher transaction');

const txData = await txResp.json();

const prevOut = txData.vout?.[txo.vout];

if (!prevOut) throw new Error(`Voucher output ${txo.vout} not found`);

const scriptPubKey = hexToU8(prevOut.scriptpubkey);

// Build and broadcast genesis tx

const fee = 300;

const outputAmount = txo.amount - fee;

if (outputAmount <= 546) throw new Error('Voucher too small for fee');

const rawTx = buildTransaction(

[{ txid: txo.txid, vout: txo.vout, amount: txo.amount, scriptPubKey }],

[{ amount: outputAmount, scriptPubKey: genesisScript }],

privkeyBytes

);

const newTxid = await broadcastTx(rawTx, mempoolUrl);

// Save trail

const trail = {

ticker,

supply,

privkey: txo.privkey,

pubkeyBase: pubkeyBaseHex,

states: [genesisState],

stateStrings: [genesisJcs],

currentTxid: newTxid,

currentVout: 0,

currentAmount: outputAmount,

network,

dateCreated: new Date().toISOString()

};

await saveTrail(trail);

return { trail, txid: newTxid, address: genesisAddr };

}

// --- Transfer: send tokens to an address ---

export async function transferToken({ ticker, to, amount, mempoolUrl = 'https://mempool.space/testnet4' }) {

const trail = await loadTrail(ticker);

if (!trail) throw new Error(`Token ${ticker} not found`);

const privkeyBytes = hexToU8(trail.privkey);

const pubkeyBase = hexToU8(trail.pubkeyBase);

// Get current state

const currentState = trail.states[trail.states.length - 1];

const currentBalances = { ...currentState.balances };

// Check issuer balance

const issuerAddr = trail.pubkeyBase;

const issuerBalance = currentBalances[issuerAddr] || 0;

if (issuerBalance < amount) {

throw new Error(`Insufficient balance: ${issuerBalance} < ${amount}`);

}

// Create transfer state

currentBalances[issuerAddr] = issuerBalance - amount;

currentBalances[to] = (currentBalances[to] || 0) + amount;

// Remove zero balances

for (const [k, v] of Object.entries(currentBalances)) {

if (v === 0) delete currentBalances[k];

}

const prevJcs = trail.stateStrings[trail.stateStrings.length - 1];

const newState = {

profile: MRC20_PROFILE,

prev: sha256Hex(prevJcs),

seq: currentState.seq + 1,

ticker: trail.ticker,

decimals: 0,

supply: trail.supply,

balances: currentBalances,

ops: [{ op: 'urn:mono:op:transfer', from: issuerAddr, to, amt: amount }]

};

const newJcs = jcs(newState);

// Derive new address

const allStateStrings = [...trail.stateStrings, newJcs];

const newP = btDeriveChainedPubkey(pubkeyBase, allStateStrings);

const newXonly = newP.slice(1);

const newScript = p2trScript(newXonly);

const newAddr = btAddress(trail.pubkeyBase, allStateStrings, trail.network);

// Fetch current UTXO scriptPubKey

const txResp = await fetch(`${mempoolUrl}/api/tx/${trail.currentTxid}`);

if (!txResp.ok) throw new Error('Could not fetch current transaction');

const txData = await txResp.json();

const prevOut = txData.vout?.[trail.currentVout];

if (!prevOut) throw new Error('Current UTXO not found');

const scriptPubKey = hexToU8(prevOut.scriptpubkey);

// Derive chained privkey for signing

const chainedPriv = btDeriveChainedPrivkey(privkeyBytes, trail.stateStrings);

// Build and broadcast

const fee = 300;

const outputAmount = trail.currentAmount - fee;

if (outputAmount <= 546) throw new Error('Trail UTXO too small for fee');

const rawTx = buildTransaction(

[{ txid: trail.currentTxid, vout: trail.currentVout, amount: trail.currentAmount, scriptPubKey }],

[{ amount: outputAmount, scriptPubKey: newScript }],

chainedPriv

);

const newTxid = await broadcastTx(rawTx, mempoolUrl);

// Update trail

trail.states.push(newState);

trail.stateStrings.push(newJcs);

trail.currentTxid = newTxid;

trail.currentVout = 0;

trail.currentAmount = outputAmount;

await saveTrail(trail);

return { trail, txid: newTxid, address: newAddr, state: newState, prevState: currentState };

}

// --- Info: show token state ---

export async function tokenInfo(ticker) {

const trail = await loadTrail(ticker);

if (!trail) throw new Error(`Token ${ticker} not found`);

const currentState = trail.states[trail.states.length - 1];

const currentAddr = btAddress(trail.pubkeyBase, trail.stateStrings, trail.network);

return {

ticker: trail.ticker,

supply: trail.supply,

seq: currentState.seq,

balances: currentState.balances,

pubkeyBase: trail.pubkeyBase,

currentTxid: trail.currentTxid,

currentAddress: currentAddr,

currentAmount: trail.currentAmount,

network: trail.network,

stateCount: trail.states.length,

dateCreated: trail.dateCreated

};

}

JavaScriptSolidServer/src/token.js at issue-179-withdraw · JavaScriptSolidServer/JavaScriptSolidServer · GitHub

Repository navigation

Expand file tree

Breadcrumbs

token.js

Latest commit

History

Breadcrumbs

token.js

File metadata and controls