useSignTransactionBlock

import {
	ConnectButton,
	useCurrentAccount,
	useSignTransactionBlock,
	useSuiClient,
} from '@mysten/dapp-kit';
import { toB64 } from '@mysten/sui/utils';
import { useState } from 'react';
 
function MyComponent() {
	const { mutateAsync: signTransactionBlock } = useSignTransactionBlock();
	const [signature, setSignature] = useState('');
	const client = useSuiClient();
	const currentAccount = useCurrentAccount();
 
	return (
		<div style={{ padding: 20 }}>
			<ConnectButton />
			{currentAccount && (
				<>
					<div>
						<button
							onClick={async () => {
								const { bytes, signature, reportTransactionEffects } = await signTransactionBlock({
									transactionBlock: new TransactionBlock(),
									chain: 'sui:devnet',
								});
 
								const executeResult = await client.executeTransactionBlock({
									transactionBlock: bytes,
									signature,
									options: {
										showRawEffects: true,
									},
								});
 
								// Always report transaction effects to the wallet after execution
								reportTransactionEffects(result.rawEffects!);
 
								console.log(executeResult);
							}}
						>
							Sign empty transaction block
						</button>
					</div>
					<div>Signature: {signature}</div>
				</>
			)}
		</div>
	);
}