verify_before_signing

Verifies that a PCZT matches the original transaction request before signing. Important security check when the PCZT was handled by a third party.

Signature

TypeScript
Go
Kotlin

function verify_before_signing(
  pczt: WasmPczt,
  payments: WasmPayment[],
  expected_change: WasmExpectedTxOut[]
): void  // Throws on failure

func VerifyBeforeSigning(
  pczt *Pczt,
  payments []Payment,
  expectedChange []ExpectedTxOut,
) error

fun verifyBeforeSigning(
  pczt: Pczt,
  payments: List<Payment>,
  expectedChange: List<ExpectedTxOut>
)  // Throws on failure

Parameters

Pczt

required

The PCZT to verify

Payment[]

required

Original payments (same as passed to propose_transaction)

ExpectedTxOut[]

required

Expected change outputs

Example

// Get actual change from PCZT
const info = t2z.inspect_pczt(pczt.to_hex());
const paymentTotal = payments.reduce((sum, p) => sum + p.amount, 0n);
const changeAmount = BigInt(info.total_orchard_output) - paymentTotal;

// Build expected change
const expectedChange = changeAmount > 0n 
  ? [new t2z.WasmExpectedTxOut(changeAddress, changeAmount)]
  : [];

// Verify
t2z.verify_before_signing(pczt, payments, expectedChange);

When to Use

PCZT came from another system
Hardware wallet workflow
Multi-party transaction construction

May be skipped when you created the PCZT yourself.

Overview

Transaction Construction

Signing

Proving & Finalization

Utilities

verify_before_signing

Signature

Parameters

Example

When to Use

See Also

​Signature

​Parameters

​Example

​When to Use

​See Also

Signature

Parameters

Example

When to Use

See Also