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Improve Goggles coinjoin detection

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Mononaut 2024-02-04 21:47:31 +00:00
parent a15729c38f
commit 7e5e85c8b9
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1 changed files with 5 additions and 4 deletions
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9
backend/src/api/common.ts
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@ -246,7 +246,8 @@ export class Common {
} else if (tx.version === 2) { } else if (tx.version === 2) {
flags |= TransactionFlags.v2; flags |= TransactionFlags.v2;
} }
const reusedAddresses: { [address: string ]: number } = {}; const reusedInputAddresses: { [address: string ]: number } = {};
const reusedOutputAddresses: { [address: string ]: number } = {};
const inValues = {}; const inValues = {};
const outValues = {}; const outValues = {};
let rbf = false; let rbf = false;
@ -290,7 +291,7 @@ export class Common {
} }
if (vin.prevout?.scriptpubkey_address) { if (vin.prevout?.scriptpubkey_address) {
reusedAddresses[vin.prevout?.scriptpubkey_address] = (reusedAddresses[vin.prevout?.scriptpubkey_address] || 0) + 1; reusedInputAddresses[vin.prevout?.scriptpubkey_address] = (reusedInputAddresses[vin.prevout?.scriptpubkey_address] || 0) + 1;
} }
inValues[vin.prevout?.value || Math.random()] = (inValues[vin.prevout?.value || Math.random()] || 0) + 1; inValues[vin.prevout?.value || Math.random()] = (inValues[vin.prevout?.value || Math.random()] || 0) + 1;
} }
@ -325,7 +326,7 @@ export class Common {
case 'op_return': flags |= TransactionFlags.op_return; break; case 'op_return': flags |= TransactionFlags.op_return; break;
} }
if (vout.scriptpubkey_address) { if (vout.scriptpubkey_address) {
reusedAddresses[vout.scriptpubkey_address] = (reusedAddresses[vout.scriptpubkey_address] || 0) + 1; reusedOutputAddresses[vout.scriptpubkey_address] = (reusedOutputAddresses[vout.scriptpubkey_address] || 0) + 1;
} }
outValues[vout.value || Math.random()] = (outValues[vout.value || Math.random()] || 0) + 1; outValues[vout.value || Math.random()] = (outValues[vout.value || Math.random()] || 0) + 1;
} }
@ -335,7 +336,7 @@ export class Common {
// fast but bad heuristic to detect possible coinjoins // fast but bad heuristic to detect possible coinjoins
// (at least 5 inputs and 5 outputs, less than half of which are unique amounts, with no address reuse) // (at least 5 inputs and 5 outputs, less than half of which are unique amounts, with no address reuse)
const addressReuse = Object.values(reusedAddresses).reduce((acc, count) => Math.max(acc, count), 0) > 1; const addressReuse = Object.keys(reusedOutputAddresses).reduce((acc, key) => Math.max(acc, (reusedInputAddresses[key] || 0) + (reusedOutputAddresses[key] || 0)), 0) > 1;
if (!addressReuse && tx.vin.length >= 5 && tx.vout.length >= 5 && (Object.keys(inValues).length + Object.keys(outValues).length) <= (tx.vin.length + tx.vout.length) / 2 ) { if (!addressReuse && tx.vin.length >= 5 && tx.vout.length >= 5 && (Object.keys(inValues).length + Object.keys(outValues).length) <= (tx.vin.length + tx.vout.length) / 2 ) {
flags |= TransactionFlags.coinjoin; flags |= TransactionFlags.coinjoin;
} }