Proxy Implementation Tracker

Reads all five standard proxy storage slots directly — EIP-1967 implementation, beacon and admin, the OpenZeppelin legacy slot and EIP-1822 — plus EIP-1167 minimal proxies, whose target is embedded in bytecode rather than storage. Follows a beacon through to its current implementation. Approving a proxy means approving whatever it points at when you transact, not what it points at now. Reads storage slots directly, so it works whether or not the contract is verified. A proxy using a wholly custom slot will read as "not a proxy" — five standards are covered, not every possible one. The implementation shown is the one right now; an admin can change it in a single transaction.