confirmDeliverySigned

async confirmDeliverySigned(walletClient: WalletClient, escrowId: bigint): Promise<string>

Gasless version of confirmDelivery() — the buyer signs a message off-chain (no gas), and anyone (you, a relayer, or the seller) can submit the signature on-chain to release funds.

Perfect for mobile users, dApp UX, or reducing buyer friction.

How It Works

1. Buyer signs a message with a 60-minute deadline
2. Signature + deadline + nonce sent to contract
3. Contract verifies signature and releases funds exactly like normal confirmDelivery

Parameters

• walletClient: WalletClient – Buyer’s wallet (only used for signing)
• escrowId: bigint

Returns

Promise<string> – Transaction hash (from whoever submits)

import { createPalindromeSDK } from '@/lib/createSDK';

const { sdk, walletClient } = await connectAndInitSDK(); // walletClient = buyer

try {
  // Buyer signs (no gas!)
  const txHash = await sdk.confirmDeliverySigned(walletClient, 42n);

  console.log("Signed & submitted successfully!");
  console.log("Delivery confirmed — funds released to seller");
  console.log("Tx:", txHash);

  // Works exactly like regular confirmDelivery
  // State → COMPLETE

} catch (error: any) {
  if (error.code === "NOT_BUYER") {
    alert("Only the buyer can sign this");
  } else if (error.code === "SIGNATURE_EXPIRED") {
    alert("Signature deadline passed — please try again");
  } else {
    console.error("Gasless confirm failed:", error.shortMessage || error.message);
  }
}