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buildAndSignWithWallet

buildAndSignWithWallet is an asynchronous function that builds a transaction, automatically adds UTxOs from the wallet, and then signs the transaction using the provided CIP-30 compatible wallet.

Function Signature​

async buildAndSignWithWallet(
  cip30OrProvider: Cip30 | Cip30Provider,
  buildRequest: Record<string, any>,
  autoAddCollateral = false,
  estimatedSpending?: number | bigint,
): Promise<SignTxResult>

Parameters​

  • cip30OrProvider: A CIP-30 compatible wallet instance or provider.
  • buildRequest: An object following Kuber's transaction builder JSON specification. For a comprehensive reference on transaction builder fields and their usage, please refer to the KuberIDE TxBuilder Object Reference.
  • autoAddCollateral: An optional boolean indicating whether to automatically add collateral from the provider. Defaults to false.
  • estimatedSpending: An optional number or bigint representing the estimated amount of Lovelace to be spent.

Returns​

A Promise that resolves to a SignTxResult object, containing the signed transaction.

Example​

import { KuberHydraApiProvider } from "kuber-client";
import { loadCrypto, Ed25519Key } from "libcardano";
import { ShelleyWallet, Cip30ShelleyWallet } from "libcardano-wallet";
import { readFileSync } from "fs";

async function main() {
  await loadCrypto();

  const hydra = new KuberHydraApiProvider("http://localhost:8081"); // Replace with your Hydra API URL

  // Load test wallet signing key
  const testWalletSigningKey = await Ed25519Key.fromCardanoCliJson(
    JSON.parse(readFileSync(process.env.HOME + "/.cardano/preview/hydra-0/credentials/funds.sk", "utf-8")),
  );

  // Setup libcardano crypto and Shelley wallet
  const shelleyWallet = new ShelleyWallet(testWalletSigningKey);
  const cip30Wallet = new Cip30ShelleyWallet(hydra, hydra, shelleyWallet, 0);
  const walletAddress = (await cip30Wallet.getChangeAddress()).toBech32();

  const transaction = {
    outputs: [{ address: walletAddress, value: "1_000_000" }], // Sending 1 ADA
    changeAddress: walletAddress,
  };

  try {
    console.log("Building and signing transaction with wallet...");
    const signedTx = await hydra.buildAndSignWithWallet(cip30Wallet, transaction);
    console.log("Signed transaction:", signedTx);
    console.log("Signed CBOR Hex:", signedTx.updatedTxBytes.toString('hex'));
  } catch (error) {
    console.error("Error building and signing transaction with wallet:", error);
  }
}

main();