Elrond smart contract verify signature

contract.rs

fn verify_signature(
        &self,
        caller: &ManagedAddress,
        url: &ManagedBuffer,
        signature: &Signature<Self::Api>,
    ) {
        let mut data = ManagedBuffer::new();
        data.append(caller.as_managed_buffer());
        data.append(url);

        let signer: ManagedAddress = self.signer().get();
        let valid_signature = self.crypto().verify_ed25519_managed::<MAX_SIGNATURE_DATA_LEN>(
            signer.as_managed_byte_array(),
            &data,
            signature,
        );
        require!(valid_signature, "Invalid signature");
    }

file.ts

const privateKey = UserSecretKey.fromPem(this.apiConfigService.getSignerPemFile());

const publicKey = privateKey.generatePublicKey();

console.log('public key hex', publicKey.hex());


// 6d795f616464726573735F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F is `address:my_address` in Mandos
const signature = privateKey.sign(
  Buffer.concat([
    Buffer.from('6d795f616464726573735F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F', 'hex'), // or use publicKey.hex()
    Buffer.from('nft-create-uri'),
  ])
);

const signatureHex = signature.toString('hex');

console.log('signature ', signatureHex);

console.log(
  'verifying signature',
  publicKey.verify(
    Buffer.concat([
      Buffer.from('6d795f616464726573735F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F5F', 'hex'),
      Buffer.from('nft-create-uri'),
    ]),
    Buffer.from(signatureHex, 'hex')
  )
);