Signing

Algorand message signing is suitable for login verification, proof of address ownership, and off-chain authorization. Add the application name, nonce and expiration time before signing.

---

Sign any message

const message = new TextEncoder().encode("Algorand sample message");

const { signature, address } = await provider.signMessage(
  message,
  "utf8", // 也可以改成 'base64'
);

console.log("Generated signature:", signature);
console.log("Recovered signer:", address);

---

Verification

import nacl from "tweetnacl";

const message = new TextEncoder().encode("Algorand sample message");
const { signature } = await provider.signMessage(message);

// Retrieve public key from address
const publicKey = algosdk.decodeAddress(provider.address).publicKey;

const isValid = nacl.sign.detached.verify(message, signature, publicKey);
console.log("Validation result:", isValid);

---

Handle Errors

try {
  const signedTxns = await provider.signTxns(walletTxns);
} catch (error) {
  if (error.code === 4001) {
    console.log("The user declined the request");
  } else if (error.code === 4100) {
    console.log("Wallet is locked");
  } else {
    console.error("Operation error:", error.message);
  }
}

---

Common error codes

Code	Details
4001	User rejected the request
4100	Authorization required
4200	Action is unavailable
4300	Input value is invalid