The application binary interface of the deployed contract, formatted in JSON. The Contract Application Binary Interface (ABI) is the standard way to interact with contracts in the Ethereum ecosystem, both from outside the blockchain and for contract-to-contract interaction. Data is encoded according to its type, as described in this specification. The encoding is not self-describing and thus requires a schema in order to decode.

[{“constant”:true,“inputs”:[],“name”:“proxyOwner”,“outputs”:[{“name”:“owner”,“type”:“address”}],“payable”:false,“stateMutability”:“view”,“type”:“function”},{“constant”:true,“inputs”:[],“name”:“pendingProxyOwner”,“outputs”:[{“name”:“pendingOwner”,“type”:“address”}],“payable”:false,“stateMutability”:“view”,“type”:“function”},{“constant”:false,“inputs”:[{“name”:“implementation”,“type”:“address”}],“name”:“upgradeTo”,“outputs”:[],“payable”:false,“stateMutability”:“nonpayable”,“type”:“function”},{“constant”:true,“inputs”:[],“name”:“implementation”,“outputs”:[{“name”:“impl”,“type”:“address”}],“payable”:false,“stateMutability”:“view”,“type”:“function”},{“constant”:false,“inputs”:[],“name”:“claimProxyOwnership”,“outputs”:[],“payable”:false,“stateMutability”:“nonpayable”,“type”:“function”},{“constant”:false,“inputs”:[{“name”:“newOwner”,“type”:“address”}],“name”:“transferProxyOwnership”,“outputs”:[],“payable”:false,“stateMutability”:“nonpayable”,“type”:“function”},{“inputs”:[],“payable”:false,“stateMutability”:“nonpayable”,“type”:“constructor”},{“payable”:true,“stateMutability”:“payable”,“type”:“fallback”},{“anonymous”:false,“inputs”:[{“indexed”:true,“name”:“previousOwner”,“type”:“address”},{“indexed”:true,“name”:“newOwner”,“type”:“address”}],“name”:“ProxyOwnershipTransferred”,“type”:“event”},{“anonymous”:false,“inputs”:[{“indexed”:false,“name”:“currentOwner”,“type”:“address”},{“indexed”:false,“name”:“pendingOwner”,“type”:“address”}],“name”:“NewPendingOwner”,“type”:“event”},{“anonymous”:false,“inputs”:[{“indexed”:true,“name”:“implementation”,“type”:“address”}],“name”:“Upgraded”,“type”:“event”}]

The code in Ethereum contracts is written in a low-level, stack-based bytecode language, referred to as EVM6 code. The code consists of a series of bytes, where each byte represents an operation.

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pragma solidity ^0.4.23;
// File: openzeppelin-solidity/contracts/ownership/Ownable.sol
/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of ""user permissions"".
 */
contract Ownable
{
  address public owner;
  ...
}