Verify Signature

This function will return true if a message passed as parameter has been signed by the passed address

const { decodeAddress, signatureVerify } = require('@polkadot/util-crypto');

const { u8aToHex } = require('@polkadot/util');

const isValidSignature = (signedMessage, signature, address) => {

const publicKey = decodeAddress(address);

const hexPublicKey = u8aToHex(publicKey);

return signatureVerify(signedMessage, signature, hexPublicKey).isValid;

};

const isValid = isValidSignature(

'This is a text message',

'0x2aeaa98e26062cf65161c68c5cb7aa31ca050cb5bdd07abc80a475d2a2eebc7b7a9c9546fbdff971b29419ddd9982bf4148c81a49df550154e1674a6b58bac84',

'5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty'

);

console.log(isValid)

// true