OpenZeppelin
Widely used audited Solidity libraries and contracts for ERC standards, access control, and upgrades.
Dapp Ahoy! World beyond Web3
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Archives: Glossary
Archives: Glossary
Optimistic Bridge
Cross chain bridge that assumes messages are valid unless challenged during a dispute window.
Off Chain Governance
Community or tokenholder signaling off chain, later enacted on chain by multisigs or timelocks.
On Chain Governance
Voting and parameter changes executed by contracts on chain, binding by code.
Ommer Block
Ethereum term replacing uncle block, a valid block not in the canonical chain but referenced for rewards.
OCDA (Offchain Data Availability)
Design where data used by a rollup or app is stored off chain with proofs or fallback mechanisms.
Ontology
Structured representation of concepts and relations used in knowledge graphs and reasoning.
Objective Function
The loss to minimize or reward to maximize during training or optimization.
Overfitting
When a model learns noise in the training set and fails to generalize to new data.
Out of Distribution
Inputs that differ from training data, often causing unreliable model behavior.
Ownership Proof
A signed message or on chain record that proves control of an address or asset.
