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Crypto Glossary

1,343 crypto, Web3, and DeFi terms — plain-English definitions from the BlockInsider editorial desks.

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O

  • OCO Order
  • OHM Fork
  • ORC-20 Tokens
  • Odysee
  • Off-Chain
  • Off-Chain Governance
  • Off-Chain Transaction
  • Off-Ledger Currency
  • Office of the Comptroller of the Currency (OCC)
  • Offline Signing Orchestrator (OSO)
  • Offline Storage
  • Offshore Account
  • On-Balance Volume (OBV)
  • On-Chain
  • On-Chain Governance
  • On-Ledger Currency
  • Onchain Fiat
  • One Cancels the Other Order (OCO)
  • Online Storage
  • Open Interest
  • Open Source
  • Open-Source Software (OSS)
  • Open/Close
  • OpenSea
  • Opera Mainnet (Fantom)
  • Operating System (OS)
  • Optimistic Oracle
  • Optimistic Rollup
  • Option
  • Options Market
  • Oracle
  • Oracle Manipulation
  • Order Book
  • Ordinals
  • Orphan
  • Orphan Block
  • Ouroboros Praos
  • Over-Collateralization
  • Over-the-Counter (OTC) Trading
  • Overbought
  • Oversold
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