chore: determined msg to sign and verify

christopher-fong · christopher-fong · commit 393b58994ba1 · 2025-06-06T15:00:53.000-04:00
Issue: BTC-2047 TICKET: BTC-2047
diff --git a/modules/utxo-lib/src/bitgo/psbt/paygoAddressProof.ts b/modules/utxo-lib/src/bitgo/psbt/paygoAddressProof.ts
@@ -57,7 +57,7 @@ export function verifyPaygoAddressProof(psbt: UtxoPsbt, outputIndex: number, pub
   const messageToVerify = toBase58Check(crypto.hash160(pub), networks.bitcoin.pubKeyHash, networks.bitcoin);
 
   // TODO: need to figure out what the message is in this context
-  // Are we verifying the address of the PayGo? we can call getAddressFromScript given output index.
+  // Answer: message is our <varint_length><Entropy><Address><UUID>
   if (!bitcoinMessage.verify(message, messageToVerify, signature)) {
     throw new Error('Cannot verify the paygo address signature with the provided pubkey.');
   }

Original file line number	Diff line number	Diff line change
`@@ -57,7 +57,7 @@ export function verifyPaygoAddressProof(psbt: UtxoPsbt, outputIndex: number, pub`
`57`	`57`	`const messageToVerify = toBase58Check(crypto.hash160(pub), networks.bitcoin.pubKeyHash, networks.bitcoin);`
`58`	`58`
`59`	`59`	`// TODO: need to figure out what the message is in this context`
`60`		`- // Are we verifying the address of the PayGo? we can call getAddressFromScript given output index.`
	`60`	`+ // Answer: message is our <varint_length><Entropy><Address><UUID>`
`61`	`61`	`if (!bitcoinMessage.verify(message, messageToVerify, signature)) {`
`62`	`62`	`throw new Error('Cannot verify the paygo address signature with the provided pubkey.');`
`63`	`63`	`}`