| OP Stack | Optimism’s open-source software stack for building L2 blockchains |
| Settlement Layer | L1 blockchain (Ethereum) where rollup state is finalized |
| Data Availability (DA) | Guarantee that transaction data is available for verification |
| Sequencer | Component that orders and executes L2 transactions |
| Prover | System that generates cryptographic proofs of L2 state |
| Fault Proof | Mechanism allowing challenges to invalid state transitions |
| Genesis | Initial state of the blockchain at block 0 |
| Chain ID | Unique numeric identifier for a blockchain network |
| RPC | Remote Procedure Call - endpoint for blockchain interactions |
| Blob (EIP-4844) | Temporary data storage on Ethereum for L2 data availability |
