// GLOSSARY -- BLOCKCHAIN & CRYPTO FUNDAMENTALS

What is Off-Chain?

1 min read Updated

Off-chain refers to data, computation, or transactions that occur outside the blockchain — processed on external servers, Layer 2 networks, or peer-to-peer channels, often with periodic settlement to the main chain.

WHY IT MATTERS

Off-chain is everything that doesn't happen on the blockchain directly. Database storage, API calls, computation, and even many 'blockchain' transactions (L2 rollups) happen off-chain with only summaries or proofs posted on-chain.

Off-chain solutions are faster and cheaper but introduce trust assumptions. When data is off-chain, you're trusting whoever stores it. Off-chain computation trusts whoever runs it. The art of blockchain architecture is choosing what must be on-chain vs what can safely be off-chain.

Common off-chain patterns: IPFS/Arweave for file storage, Layer 2 rollups for transaction execution, Snapshot for governance voting, and The Graph for data indexing.

FREQUENTLY ASKED QUESTIONS

Is off-chain less secure?
It depends on the trust model. Off-chain with validity proofs (ZK rollups) is as secure as on-chain. Off-chain with a centralized operator requires trusting that operator.
What are off-chain signatures?
Messages signed with private keys but not submitted to the blockchain. Used for gasless approvals (EIP-2612 permits), order signing (0x protocol), and governance voting (Snapshot).
How do you verify off-chain data?
Through cryptographic proofs (validity proofs, Merkle proofs), reputation systems, or by eventually settling on-chain. The verification method determines the trust assumption.

FURTHER READING

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