feat(utxo-lib): use fixed sessionId for deterministic nonce creation

OttoAllmendinger · llm-git · OttoAllmendinger · commit 04317c797df7 · 2025-10-15T17:45:52.000+02:00
Issue: BTC-2651 Co-authored-by: llm-git <llm-git@ttll.de>
diff --git a/modules/utxo-lib/src/testutil/psbt.ts b/modules/utxo-lib/src/testutil/psbt.ts
@@ -212,7 +212,9 @@ export function constructPsbt(
     return psbt;
   }
 
-  psbt.setAllInputsMusig2NonceHD(rootWalletKeys['user']);
+  /* use fixed sessionId for deterministic nonce creation */
+  const sessionId = Buffer.alloc(32);
+  psbt.setAllInputsMusig2NonceHD(rootWalletKeys['user'], { sessionId });
   psbt.setAllInputsMusig2NonceHD(rootWalletKeys['bitgo'], { deterministic });
 
   signAllPsbtInputs(psbt, inputs, rootWalletKeys, 'halfsigned', { signers, skipNonWitnessUtxo });

Original file line number	Diff line number	Diff line change
`@@ -212,7 +212,9 @@ export function constructPsbt(`
`212`	`212`	`return psbt;`
`213`	`213`	`}`
`214`	`214`
`215`		`- psbt.setAllInputsMusig2NonceHD(rootWalletKeys['user']);`
	`215`	`+ /* use fixed sessionId for deterministic nonce creation */`
	`216`	`+ const sessionId = Buffer.alloc(32);`
	`217`	`+ psbt.setAllInputsMusig2NonceHD(rootWalletKeys['user'], { sessionId });`
`216`	`218`	`psbt.setAllInputsMusig2NonceHD(rootWalletKeys['bitgo'], { deterministic });`
`217`	`219`
`218`	`220`	`signAllPsbtInputs(psbt, inputs, rootWalletKeys, 'halfsigned', { signers, skipNonWitnessUtxo });`