Solana Signing

Sign Solana transactions using @solana/web3.js or Anchor

Overview

Solana transactions returned by the Yield.xyz API can be signed using the official Solana SDK or the Anchor framework. Below you’ll find examples for both approaches.

@solana/web3.js

@solana/web3.js

@solana/web3.js is the official JavaScript SDK for interacting with the Solana blockchain.

Installation

npm install @solana/web3.js bs58

Signing a Transaction

import {
  Connection,
  Keypair,
  Transaction,
  sendAndConfirmTransaction,
} from "@solana/web3.js";
import bs58 from "bs58";

const connection = new Connection(process.env.SOLANA_RPC_URL!, "confirmed");
const keypair = Keypair.fromSecretKey(bs58.decode(process.env.SOLANA_PRIVATE_KEY!));

async function signAndSend(serializedTx: string) {
  const txBuffer = Buffer.from(serializedTx, "base64");
  const transaction = Transaction.from(txBuffer);

  transaction.sign(keypair);

  const signature = await sendAndConfirmTransaction(connection, transaction, [
    keypair,
  ]);

  console.log("Transaction signature:", signature);
  return signature;
}

Use "confirmed" commitment for a good balance between speed and reliability. Switch to "finalized" when you need maximum certainty.

Anchor

Anchor

Anchor is a framework for Solana that provides higher-level abstractions, often used alongside @solana/web3.js.

Installation

npm install @coral-xyz/anchor @solana/web3.js

Signing a Transaction

import { AnchorProvider, Wallet } from "@coral-xyz/anchor";
import { Connection, Keypair, Transaction } from "@solana/web3.js";

const connection = new Connection(process.env.SOLANA_RPC_URL!, "confirmed");
const keypair = Keypair.fromSecretKey(/* your secret key bytes */);
const wallet = new Wallet(keypair);

const provider = new AnchorProvider(connection, wallet, {
  commitment: "confirmed",
});

async function signAndSend(serializedTx: string) {
  const txBuffer = Buffer.from(serializedTx, "base64");
  const transaction = Transaction.from(txBuffer);

  const signedTx = await provider.wallet.signTransaction(transaction);
  const signature = await connection.sendRawTransaction(signedTx.serialize());

  await connection.confirmTransaction(signature, "confirmed");
  console.log("Transaction signature:", signature);
  return signature;
}

Anchor’s Provider can also be used with a browser wallet adapter for front-end applications.