I thought blockchain is a decentralized concept? so where do i need to authenticate these info from? From a server?
public function __construct($url, $username, $password, $timeout = 3)
$this->jsonRPCClient = new JsonRPCClient($url, $timeout, $this->headers);
To construct a blockchain, i need to give the url username and password, where should i get it from?? i am confused.