Glossary

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Term	Meaning
Frame Transaction	The EIP-8141 transaction type (type 0x06). A list of frames executed in order.
Frame	One step of a Frame Transaction, with a mode (DEFAULT, VERIFY or SENDER), flags, a target, gas limits, a value and data.
Validation prefix	The shortest prefix of frames whose successful execution sets the payer. Everything after it is the execution body.
Validation frame	A frame inside the validation prefix.
Frame subclass	A role label for a validation frame: self_verify, only_verify, pay, expiry_verify, deploy, and pre_verify (added by ERC-8421). See Frame subclasses.
Entity	A contract that a validation frame executes directly: the sender, the payer or the factory.
Default-code entity	An entity with empty code, which runs EIP-8141’s default code. Never staked and exempt from opcode, call and storage rules.
Staked entity	An entity with at least MIN_STAKE_VALUE staked, an unstake delay of at least MIN_UNSTAKE_DELAY, and no withdrawal in progress.
Associated storage	Storage slots a well-behaved contract uses to track state for a specific address. See Associated storage.
Canonical paymaster	A paymaster whose runtime code exactly matches the implementation defined by EIP-8141.
Canonical public mempool	The public mempool defined by EIP-8141.
Standard Alternative Mempool	The default ruleset of ERC-8421.
Custom Alternative Mempool	A ruleset defined by a third-party operator and identified by its own topic.
Network-wide rule	A rule whose violation damages the reputation of the peer that sent the transaction.
Local rule	A rule that depends on one node’s own mempool contents. Violating it never penalizes a peer.
Admission validation	The simulation a node performs before it first accepts a transaction.
Revalidation	A re-simulation of a pending transaction against a newer head.
Spammer	A peer that sends many transactions that were never valid.
Mass invalidation attack	Many transactions pass admission and propagate, then later become invalid together.
seen / included	Per-entity counters used by reputation. See Reputation.
Staking Registry	The on-chain contract that records stake. Its interface is IStakingRegistry.
Sidecar	The reference mempool node, a TypeScript fork of Skandha. See Run the sidecar.