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refactor(utxo-staking): classify PoX-5 recovery branches #9669

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Merged
OttoAllmendinger merged 1 commit into from
Sep 7, 2026
+21 −0
Merged

refactor(utxo-staking): classify PoX-5 recovery branches #9669

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11 changes: 11 additions & 0 deletions modules/utxo-staking/src/pox5/recovery.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,17 @@ export function assertPox5EarlyExitSpend(psbt: Psbt, input: pox5.Pox5InputMatch)
getMatchedTransactionInput(psbt, input);
}

export type Pox5SpendBranch = 'locktime' | 'early-exit';

/** Classify a PoX-5 spend from native principal-preimage metadata. */
export function classifyPox5Spend(psbt: Psbt, input: pox5.Pox5InputMatch): Pox5SpendBranch {
getMatchedTransactionInput(psbt, input);
const hasPrincipalPreimage = psbt
.getInputKeyValues(input.inputIndex)
.some((record) => record.type === 'known' && record.key === 'PSBT_IN_SHA256');
return hasPrincipalPreimage ? 'early-exit' : 'locktime';
}

/** Add validated principal-preimage metadata for an early-exit spend. */
export function preparePox5EarlyExit(
psbt: Psbt,
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10 changes: 10 additions & 0 deletions modules/utxo-staking/test/unit/pox5/recovery.ts
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Expand Up @@ -8,6 +8,7 @@ import { getKey, getKeyTriple } from '@bitgo/wasm-utxo/testutils';
import {
assertPox5EarlyExitSpend,
assertPox5LocktimeSpend,
classifyPox5Spend,
POX5_MAX_UNLOCK_HEIGHT,
preparePox5EarlyExit,
} from '../../../src/pox5';
Expand Down Expand Up @@ -60,6 +61,15 @@ describe('PoX-5 spend policy', function () {
assert.doesNotThrow(() => assertPox5EarlyExitSpend(timestampLocktime.psbt, timestampLocktime.match));
});

it('classifies the spend from native principal-preimage metadata', function () {
const locktimeSpend = createPox5RecoveryPsbt(UNLOCK_HEIGHT);
assert.equal(classifyPox5Spend(locktimeSpend.psbt, locktimeSpend.match), 'locktime');

const earlyExitSpend = createPox5RecoveryPsbt(0);
preparePox5EarlyExit(earlyExitSpend.psbt, 0, earlyExitSpend.match, earlyExitSpend.principalPreimage);
assert.equal(classifyPox5Spend(earlyExitSpend.psbt, earlyExitSpend.match), 'early-exit');
});

it('enforces the block-height and unlock-height boundaries', function () {
const atHeight = createPox5RecoveryPsbt(UNLOCK_HEIGHT);
const aboveHeight = createPox5RecoveryPsbt(UNLOCK_HEIGHT + 1);
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