Blockchain By Example

Your first smart contract

Before we go any further, let's be concrete and jump into our first smart contract right away. The following code shows what a standard Hello World smart contract, written in a higher programming language (Solidity), looks like:

pragma solidity ^0.4.24;contract HelloWorld {    string message = "hello world";    function setMessage(string msg_)  public {        message = msg_;    }    function getMessage() public view returns (string) {        return message;    }}

If you're a developer, this code should be understandable; there is nothing complex. We define a variable, message, with two functions, a setter and a getter. What differs is the fact that we are dealing with a contract that easily stores a given message in Ethereum's blockchain, without ...