Sign Transaction

The signTransaction action prompts the connected wallet to sign a transaction without executing it. This is useful when you need a signed transaction for later execution or for multi-signature scenarios.

Usage

import { createDAppKit } from '@mysten/dapp-kit-core';
import { Transaction, coinWithBalance } from '@mysten/sui/transactions';

const dAppKit = createDAppKit({
	/* config */
});

const tx = new Transaction();
// No need to manually set sender - it's done automatically
tx.transferObjects([coinWithBalance({ balance: 123 })], '0xrecipient...');

// Sign the transaction without executing it
const { bytes, signature } = await dAppKit.signTransaction({
	transaction: tx,
});

Parameters

• transaction - Transaction | string - The transaction to sign. Can be either a Transaction instance or base64-encoded bcs bytes for the transaction.
• signal (optional) - AbortSignal - An abort signal to cancel the signing request.

Return Value

Returns a Promise that resolves to an object containing:

• bytes - string - The signed transaction as a base64-encoded BCS string
• signature - string - The signature as a base64-encoded string

const result = await dAppKit.signTransaction({ transaction });
console.log('Signed transaction bytes:', result.bytes);
console.log('Signature:', result.signature);

Transaction Building

When passing a Transaction instance, the action automatically:

1. Sets the sender address if not already set
2. Builds the transaction using the current network's client
3. Converts it to the appropriate format for the wallet

Wallet Compatibility

• The action transparently handles both sui:signTransaction and sui:signTransactionBlock wallet-standard features

// The action automatically detects and uses the appropriate method
// No special configuration needed
const result = await dAppKit.signTransaction({
	transaction: tx,
});