ORAM

Oblivious RAM protocol that hides access patterns to storage from an observer.

OPRF

Oblivious pseudorandom function that lets a client evaluate a PRF on its input with the server’s key without revealing the input.

Oblivious Transfer

Primitive where a sender transfers one of many pieces of information, but remains oblivious to which one was received.

Order Flow Auction

Mechanism where order flow is auctioned to builders or solvers to reduce MEV and improve price.

Order Book DEX

Exchange that matches buys and sells via an order book rather than an automated market maker.

Orphan Block

A block that is valid but not part of the final canonical chain due to reorgs.

OP Stack

Open source framework for building optimistic rollups and L2s with shared components.

Opcode

Low level instruction executed by a virtual machine such as EVM or WASM.

Optimistic Rollup

Rollup that assumes transactions are valid by default and relies on fraud proofs during a challenge window.

Off Chain

Computation or storage done outside the blockchain, later proven or settled on chain.

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