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Просмотр файла: dustThreshold.js
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Object.defineProperty(exports, "__esModule", { value: true });
exports.getDustThresholdSat = getDustThresholdSat;
exports.getDustThresholdSatForOutputScript = getDustThresholdSatForOutputScript;
const utxolib = __importStar(require("@bitgo/utxo-lib"));
/**
* Checks if the output script is a witness script or not
* @param script
* @returns true if the script is a witness script
*/
function isWitnessOutputScript(script) {
/**
* Source: https://github.com/bitcoin/bitcoin/blob/v28.1/src/script/script.cpp#L241-L257
* A witness program is any valid CScript that consists of a 1-byte push opcode
* followed by a data push between 2 and 40 bytes.
*/
if (script.length < 4 || script.length > 42) {
return false;
}
if (script[0] !== utxolib.opcodes.OP_0 && (script[0] < utxolib.opcodes.OP_1 || script[0] > utxolib.opcodes.OP_16)) {
return false;
}
return script[1] + 2 === script.length;
}
function getDustRelayLimit(network) {
network = utxolib.getMainnet(network);
switch (network) {
case utxolib.networks.bitcoin:
case utxolib.networks.bitcoingold:
case utxolib.networks.dash:
// btc: https://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.h#L50-L55
// btg: https://github.com/BTCGPU/BTCGPU/blob/v0.17.3/src/policy/policy.h#L48
// dash: https://github.com/dashpay/dash/blob/v22.0.0-beta.1/src/policy/policy.h#L41-L46
return { feeRateSatKB: 3000 };
case utxolib.networks.bitcoincash:
// https://github.com/bitcoin-cash-node/bitcoin-cash-node/blob/v27.1.0/src/policy/policy.h#L76-L83
// I actually haven't looked at BSV and am depressed that I still need to handle the case here
return { feeRateSatKB: 1000 };
case utxolib.networks.dogecoin:
// https://github.com/dogecoin/dogecoin/blob/v1.14.8/src/policy/policy.h#L65-L81
// (COIN / 100) / 10;
return { satAmount: 1000000 };
case utxolib.networks.litecoin:
// https://github.com/litecoin-project/litecoin/blob/master/src/policy/policy.h#L47-L52
return { feeRateSatKB: 30000 };
case utxolib.networks.zcash:
// https://github.com/zcash/zcash/blob/master/src/primitives/transaction.h#L396-L399
// https://github.com/zcash/zcash/blob/v6.0.0/src/policy/policy.h#L43-L89 (I don't quite get it)
return { satAmount: 300 };
case utxolib.networks.bitcoinsv:
throw new Error('deprecated coin');
default:
throw new Error('unsupported network');
}
}
function getSpendSize(network, outputSize, isWitness) {
network = utxolib.getMainnet(network);
switch (network) {
case utxolib.networks.bitcoin:
case utxolib.networks.bitcoincash:
case utxolib.networks.bitcoingold:
case utxolib.networks.litecoin:
/*
btc: https://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.cpp#L26-L68
bch: https://github.com/bitcoin-cash-node/bitcoin-cash-node/blob/v27.1.0/src/policy/policy.cpp#L18-L36 (btc-ish)
btg: https://github.com/BTCGPU/BTCGPU/blob/v0.17.3/src/policy/policy.cpp#L18-L50 (btc-ish)
ltc: https://github.com/litecoin-project/litecoin/blob/v0.21.4/src/policy/policy.cpp#L15-L47 (btc-ish)
The fixed component here is 69.75 for isWitness=true and 150 for isWitness=false.
*/
return outputSize + 32 + 4 + 1 + 107 / (isWitness ? 4 : 1) + 4;
case utxolib.networks.dash:
// dash: https://github.com/dashpay/dash/blob/v21.1.1/src/policy/policy.cpp#L14-L30 (btc-ish)
// how did they end up with 148? I don't know
return outputSize + 148;
case utxolib.networks.dogecoin:
case utxolib.networks.zcash:
// doge: https://github.com/dogecoin/dogecoin/blob/v1.14.8/src/policy/policy.h#L65-L81 (hardcoded)
// zec: https://github.com/zcash/zcash/blob/v6.0.0/src/policy/policy.h#L43-L89 (some weird other thing, doge-ish)
throw new Error('dust limit is size-independent');
case utxolib.networks.bitcoinsv:
throw new Error('deprecated coin');
default:
throw new Error('unsupported network');
}
}
function getDustThresholdSat(network, outputSize, isWitness) {
const dustLimit = getDustRelayLimit(network);
if ('satAmount' in dustLimit) {
return dustLimit.satAmount;
}
if ('feeRateSatKB' in dustLimit) {
const spendSize = getSpendSize(network, outputSize, isWitness);
return Math.ceil((dustLimit.feeRateSatKB * spendSize) / 1000);
}
throw new Error('unexpected dustLimit');
}
function getDustThresholdSatForOutputScript(network, script) {
return getDustThresholdSat(network, script.length, isWitnessOutputScript(script));
}
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* as utxolib from '@bitgo/utxo-lib';\n\n/**\n * Checks if the output script is a witness script or not\n * @param script\n * @returns true if the script is a witness script\n */\nfunction isWitnessOutputScript(script: Buffer): boolean {\n  /**\n   * Source: https://github.com/bitcoin/bitcoin/blob/v28.1/src/script/script.cpp#L241-L257\n   * A witness program is any valid CScript that consists of a 1-byte push opcode\n   * followed by a data push between 2 and 40 bytes.\n   */\n  if (script.length < 4 || script.length > 42) {\n    return false;\n  }\n  if (script[0] !== utxolib.opcodes.OP_0 && (script[0] < utxolib.opcodes.OP_1 || script[0] > utxolib.opcodes.OP_16)) {\n    return false;\n  }\n  return script[1] + 2 === script.length;\n}\n\n/*\n\nThe dust threshold for most UTXO coins is dependent on multiple factors:\n\n(1) spendability of the output (OP_RETURNs are allowed to be 0 sized)\n(2) whether it is a witness or non-witness output\n(3) a particular fee rate (GetDiscardRate())\n\nI will do the analysis mostly for bitcoin here and then generalize.\n\nOn the indexer we use `sendrawtransaction`, which calls `IsStandardTx` like this\n\nhttps://github.com/bitcoin/bitcoin/blob/v28.0/src/kernel/mempool_options.h#L47\n\n```\nif (\n  m_pool.m_opts.require_standard &&\n   !IsStandardTx(tx,\n   m_pool.m_opts.max_datacarrier_bytes,\n   m_pool.m_opts.permit_bare_multisig,\n   m_pool.m_opts.dust_relay_feerate, reason))\n```\n\nThe `dust_relay_feerate` in this context is a hardcoded constant:\nhttps://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.h#L50-L55\n\n(that can actually be overridden with a hidden command\nline parameter: https://bitcoin.stackexchange.com/a/41082/137601)\n\nThere we call `IsDust`\n\nhttps://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.cpp#L144-L146\n\n```\nif (IsDust(txout, dust_relay_fee)) {\n    reason = \"dust\";\n    return false;\n}\n```\n\nWhich calls `GetDustThreshold`,\n\nhttps://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.cpp#L67\n\nThe implementation of `GetDustThreshold` computes the minimal transaction size that can spend the output, and computes\na minimum fee for that transaction size based on the `dust_relay_fee` (FeeRate) parameter.\n\nThe different utxo implementations differ in these ways:\n\n- some have a fixed, satoshi amount dust limit (doge, zec)\n- some have a different dust_relay_fee\n\n*/\n\ntype DustLimit = { feeRateSatKB: number } | { satAmount: number };\n\nfunction getDustRelayLimit(network: utxolib.Network): DustLimit {\n  network = utxolib.getMainnet(network);\n  switch (network) {\n    case utxolib.networks.bitcoin:\n    case utxolib.networks.bitcoingold:\n    case utxolib.networks.dash:\n      // btc:  https://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.h#L50-L55\n      // btg:  https://github.com/BTCGPU/BTCGPU/blob/v0.17.3/src/policy/policy.h#L48\n      // dash: https://github.com/dashpay/dash/blob/v22.0.0-beta.1/src/policy/policy.h#L41-L46\n      return { feeRateSatKB: 3000 };\n    case utxolib.networks.bitcoincash:\n      // https://github.com/bitcoin-cash-node/bitcoin-cash-node/blob/v27.1.0/src/policy/policy.h#L76-L83\n      // I actually haven't looked at BSV and am depressed that I still need to handle the case here\n      return { feeRateSatKB: 1000 };\n    case utxolib.networks.dogecoin:\n      // https://github.com/dogecoin/dogecoin/blob/v1.14.8/src/policy/policy.h#L65-L81\n      // (COIN / 100) / 10;\n      return { satAmount: 1_000_000 };\n    case utxolib.networks.litecoin:\n      //  https://github.com/litecoin-project/litecoin/blob/master/src/policy/policy.h#L47-L52\n      return { feeRateSatKB: 30_000 };\n    case utxolib.networks.zcash:\n      // https://github.com/zcash/zcash/blob/master/src/primitives/transaction.h#L396-L399\n      // https://github.com/zcash/zcash/blob/v6.0.0/src/policy/policy.h#L43-L89 (I don't quite get it)\n      return { satAmount: 300 };\n    case utxolib.networks.bitcoinsv:\n      throw new Error('deprecated coin');\n    default:\n      throw new Error('unsupported network');\n  }\n}\n\nfunction getSpendSize(network: utxolib.Network, outputSize: number, isWitness: boolean): number {\n  network = utxolib.getMainnet(network);\n  switch (network) {\n    case utxolib.networks.bitcoin:\n    case utxolib.networks.bitcoincash:\n    case utxolib.networks.bitcoingold:\n    case utxolib.networks.litecoin:\n      /*\n        btc:  https://github.com/bitcoin/bitcoin/blob/v28.0/src/policy/policy.cpp#L26-L68\n        bch:  https://github.com/bitcoin-cash-node/bitcoin-cash-node/blob/v27.1.0/src/policy/policy.cpp#L18-L36 (btc-ish)\n        btg:  https://github.com/BTCGPU/BTCGPU/blob/v0.17.3/src/policy/policy.cpp#L18-L50 (btc-ish)\n        ltc:  https://github.com/litecoin-project/litecoin/blob/v0.21.4/src/policy/policy.cpp#L15-L47 (btc-ish)\n\n        The fixed component here is 69.75 for isWitness=true and 150 for isWitness=false.\n       */\n      return outputSize + 32 + 4 + 1 + 107 / (isWitness ? 4 : 1) + 4;\n    case utxolib.networks.dash:\n      // dash: https://github.com/dashpay/dash/blob/v21.1.1/src/policy/policy.cpp#L14-L30 (btc-ish)\n      // how did they end up with 148? I don't know\n      return outputSize + 148;\n    case utxolib.networks.dogecoin:\n    case utxolib.networks.zcash:\n      // doge: https://github.com/dogecoin/dogecoin/blob/v1.14.8/src/policy/policy.h#L65-L81 (hardcoded)\n      // zec:  https://github.com/zcash/zcash/blob/v6.0.0/src/policy/policy.h#L43-L89 (some weird other thing, doge-ish)\n      throw new Error('dust limit is size-independent');\n    case utxolib.networks.bitcoinsv:\n      throw new Error('deprecated coin');\n    default:\n      throw new Error('unsupported network');\n  }\n}\n\nexport function getDustThresholdSat(network: utxolib.Network, outputSize: number, isWitness: boolean): number {\n  const dustLimit = getDustRelayLimit(network);\n  if ('satAmount' in dustLimit) {\n    return dustLimit.satAmount;\n  }\n  if ('feeRateSatKB' in dustLimit) {\n    const spendSize = getSpendSize(network, outputSize, isWitness);\n    return Math.ceil((dustLimit.feeRateSatKB * spendSize) / 1000);\n  }\n  throw new Error('unexpected dustLimit');\n}\n\nexport function getDustThresholdSatForOutputScript(network: utxolib.Network, script: Buffer): number {\n  return getDustThresholdSat(network, script.length, isWitnessOutputScript(script));\n}\n"]}Выполнить команду
Для локальной разработки. Не используйте в интернете!