data availability . 19, 26, 134
an account on an EVM blockchain which is controlled by an offchain key pair, not smart contract bytecode. . 14, 91, 114
Espresso confirmation layer . 1–3, 8, 11, 14–19, 21, 24, 26, 31, 43, 48
Layer 1. A blockchain which is its own settlement layer , e.g. Ethereum . 14, 16–20, 22, 24, 25, 30, 53, 67–70, 74, 85, 91, 94, 116
Layer 2. A blockchain whose settlement layer is the L1. Often a rollup . . 133
Proof of Stake. . 19, 26
state transition function. A determinstic function which derives some state from a parent state and an input. Usually used in the context of rollups or state machine replication . 1, 2, 7
a computing environment which is capable of producing unforgeable proofs (called attestations) that certain data was produced by executing specific code . 48, 56, 87, 92, 108, 113, 115, 116, 126, 128