This module explains who controls EOAs versus smart contracts, how they initiate or react to actions, and how to recognize each in block explorers and on-chain activity. You’ll practice confirming a contract, locating its deployer via Reactor’s Transactions and TEX views, adding the creator to your graph, and tracing earliest inbound funding, often a first KYC lead, not proof of complicity. The module also outlines risks and tips for both EOAs and contracts, and highlights investigative limits, including privacy tools, contract factories, shared funding, and upgradeable code.