data availability . 19, 26, 174
an account on an EVM blockchain which is controlled by an offchain key pair, not smart contract bytecode. . 14, 105, 149
Espresso confirmation layer . 1–3, 8, 11, 14–19, 21, 24, 26, 39, 59, 64, 168
Layer 1. A blockchain which is its own settlement layer , e.g. Ethereum . 14, 16–20, 22, 24, 25, 38, 69, 79, 81–83, 87, 100, 105, 106, 129, 132, 137, 141–143, 151
Layer 2. A blockchain whose settlement layer is the L1. Often a rollup . . 173
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 . 64, 69, 70, 101, 106, 119, 146, 149, 150, 163, 165