Before sending a transaction, one must first sign it with a valid private key. This can be done with one of the numerous SDKs provided by the Zilliqa team and community.

Signing is done against the Protobuf-serialised version of the transaction's contents. This is the reason why all SDKs depend on Protobuf to function. This step is transparent to you as a developer.

Example of providing a private key:

const { Zilliqa } = require('@zilliqa-js/zilliqa');
const { getAddressFromPrivateKey } = require('@zilliqa-js/crypto');
const zilliqa = new Zilliqa("");
const PRIVATE_KEY = '9afc1a1dab96127e902daaaec1a56c30346f007523c787c3bb62371c0e5a1be7'