Immutable input bytes on an Ethereum transaction. Rollups used it for data before blobs.

The official bridge of an L2 or chain, usually the safest path for that asset's native representation.

Chainlink's Cross-Chain Interoperability Protocol for moving tokens and messages across networks.

Solana's metering for how much work a transaction may consume.

The part of a stack that agrees on the next block, such as Ethereum's Beacon Chain.