validateSignableTransaction

Validates that a signable transaction is properly formed and contains the expected message.

This function verifies that the message in a signable object matches the expected encoded message based on the signer's role (payer or non-payer). It ensures the integrity of the signing process by confirming that the message to be signed corresponds correctly to the transaction data.

For payers: Validates against the transaction envelope encoding For non-payers (proposers/authorizers): Validates against the transaction payload encoding

Import

You can import the entire package and access the function:

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import * as sdk from "@onflow/sdk"

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sdk.validateSignableTransaction(signable)

Or import directly the specific function:

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import { validateSignableTransaction } from "@onflow/sdk"

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validateSignableTransaction(signable)

Usage

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import * as fcl from "@onflow/fcl";

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// This function is typically used internally by wallet connectors

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// and authorization functions to ensure transaction integrity

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const signable = {

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roles: { payer: true, proposer: false, authorizer: false },

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voucher: {

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cadence: "transaction { prepare(acct: AuthAccount) {} }",

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proposalKey: { address: "0x01", keyId: 0, sequenceNum: 42 },

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payer: "0x02",

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authorizers: ["0x01"],

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// ... other voucher data

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},

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message: "encoded_transaction_envelope_here"

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};

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try {

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const isValid = fcl.validateSignableTransaction(signable);

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console.log("Signable is valid:", isValid);

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// Proceed with signing

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} catch (error) {

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console.error("Invalid signable:", error.message);

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// Handle validation failure

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}

Parameters

signable

• Type: Signable
• Description: The signable object to validate

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interface Signable {

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voucher: Voucher

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}

Returns

boolean

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