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DocumentationWalletsCheck if Private Key Matches Address

Check if Private Key Matches Address

Verifies if a private key matches a given address by deriving the public key from the private key and comparing it to the provided address.

Returns: boolean - true if the private key matches the address, false otherwise

const matches = connection.checkAddressMatchesPrivateKey(privateKey, address);

Parameters

  • privateKey: Uint8Array - The private key in bytes format (array of numbers)
  • address: Address - The address to verify against

Examples

Check if a private key matches an address:

// Private key as array of numbers (from solana-keygen or environment)
const privateKey = new Uint8Array([/* private key bytes */]);
const address = "GkFTrgp8FcCgkCZeKreKKVHLyzGV6eqBpDHxRzg1brRn";
 
const matches = connection.checkAddressMatchesPrivateKey(privateKey, address);
console.log(`Private key matches address: ${matches}`);

Verify a wallet loaded from file:

// Load wallet from file
const wallet = await connection.loadWalletFromFile("path/to/keypair.json");
 
// Check if the loaded wallet's private key matches its address
const matches = connection.checkAddressMatchesPrivateKey(
  wallet.privateKey, 
  wallet.address
);
 
if (!matches) {
  throw new Error("Wallet private key does not match its address");
}
console.log("Wallet verification successful");

Validate environment variable private key:

// Load private key from environment
const privateKeyString = process.env.PRIVATE_KEY;
if (!privateKeyString) {
  throw new Error("PRIVATE_KEY environment variable not set");
}
 
// Parse private key (assuming it's in the array format)
const privateKey = new Uint8Array(
  privateKeyString.split(',').map(num => parseInt(num.trim()))
);
 
const expectedAddress = "GkFTrgp8FcCgkCZeKreKKVHLyzGV6eqBpDHxRzg1brRn";
const matches = connection.checkAddressMatchesPrivateKey(privateKey, expectedAddress);
 
if (!matches) {
  throw new Error("Environment private key does not match expected address");
}
console.log("Environment private key is valid");

See also

Last updated on
Connecting to a Solana RPCCheck if Address is a Valid Public Key