Technical dictionary
EOA (Externally Owned Account)
Ethereum-style account controlled by a private key (not a contract)—usually secp256k1 ECDSA today.
Definition
Externally owned accounts are the common user wallet model on Ethereum and many EVM chains. Transactions are authorized with classical ECDSA signatures over secp256k1.
Quantum planning for EOAs means inventorying keys, avoiding reckless reuse/exposure patterns, and watching account-abstraction paths that may enable signature agility later.