Read-only factual data about historical Ethereum mainnet contracts. Use when the user asks about a specific contract address, early Ethereum contracts, deployment era, deployer, bytecode, decompiled code, or documented history (what a contract is and is not). Data is non-opinionated and includes runtime bytecode, decompiled code, and editorial history when available. Base URL https://ethereumhistory.com (or set BASE_URL for local/staging).

关于以太坊主网历史合约的只读事实数据。当用户询问特定合约地址、早期以太坊合约、部署时期、部署者、字节码、反编译代码或文档化历史（合约的用途与非用途）时使用。数据客观中立，包含可用的运行时字节码、反编译代码和编辑历史。基础网址为 https://ethereumhistory.com（或设置 BASE_URL 用于本地/预发环境）