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There are, however, nodes that store the whole copy of the historical state of the blockchain. This serves for historical and development purposes. 2.2.2.3 Solidity and a Sample Smart Contract Smart contracts run on the Ethereum Virtual Machine, which in turn runs on each node. Though powerful, the Ethereum Virtual Machine works at a level too low to be convenient to directly program (like most VMs). For this reason, several languages for writing contracts have been developed. Of these, the most popular one is Solidity13. Solidity is a JavaScript-like language developed specifically for writing Ethereum Smart Contracts. The Solidity compiler turns this code into Ethereum Virtual Machine bytecode, which can then be sent to the Ethereum network as a transaction to be given its own address. To better understand Solidity, let’s take a look at one example: pragma solidity ^0.4.2; contract OwnerClaims { string constant public defaultKey = "default"; mapping(address => mapping(string => string)) private owners; function setClaim(string key, string value) { owners[msg.sender][key] = value; } function getClaim(address owner, string key) constant returns (string) { return owners[owner][key]; } function setDefaultClaim(string value) { setClaim(defaultKey, value); } function getDefaultClaim(address owner) constant returns (string) { return getClaim(owner, defaultKey); } } This is a simple owner claims contract. An owner claims contract is a contract that lets any address owner to record arbitrary key-value data. The nature of the blockchain certifies that the owner of certain address is the only one who can set claims in connection to that address. In other words, the owner claims contract allows anyone who wants to perform transactions with one of your addresses 13 https://solidity.readthedocs.io/en/develop/ 36PDF Image | Intro to Ethereum and Smart Contracts
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