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Signing

Connect the provider before signing. The transaction examples use the algosdk 2-style from/to fields; match the SDK major version you install. algodClient, addresses, and grouped transactions must be prepared before running the snippets. Browser examples using Buffer need an explicit buffer import or an equivalent base64 encoder.

Learn how to sign messages for authentication on Algorand.

Sign Arbitrary Message


const message = new TextEncoder().encode('Hello Algorand!')
 
const { signature, address } = await provider.signMessage(
  message,
  'utf8' // or 'hex'
)
 
console.log('Signature:', signature)
console.log('Signer:', address)

Verify Signature


import nacl from 'tweetnacl'
 
const message = new TextEncoder().encode('Hello Algorand!')
const { signature } = await provider.signMessage(message)
 
// Get public key from address
const publicKey = algosdk.decodeAddress(provider.address).publicKey
 
const isValid = nacl.sign.detached.verify(message, signature, publicKey)
console.log('Valid:', isValid)

Error Handling


try {
  const signedTxns = await provider.signTxns(walletTxns)
} catch (error) {
  if (error.code === 4001) {
    console.log('User rejected the request')
  } else if (error.code === 4100) {
    console.log('The account or method is not authorized')
  } else {
    console.error('Error:', error.message)
  }
}

Common Error Codes

Code	Description
4001	User rejected request
4100	Unauthorized
4200	Unsupported method
-32602	Invalid parameters