Clear DefinitionsOracle Attestation
Pronunciation
[awr-uh-kl at-es-tay-shun]
Analogy
Like a notary public stamping and signing a document to certify it’s genuine, an oracle attestation vouches for data authenticity.
Definition
A signed statement by an oracle node asserting the validity of specific data at a given time, providing cryptographic proof that smart contracts can verify on‑chain.
Key Points Intro
Oracle attestations anchor external data on‑chain with cryptographic signatures for trust.
Key Points
Signature: ECDSA/BLS signature over data and timestamp.
Timestamp: Indicates when data was valid.
Data payload: Encodes the attested value and metadata.
On‑chain verification: Smart contracts verify signature against known oracle key.
Example
A weather oracle attests “Temperature=22°C at 2025‑05‑10T12:00Z” by signing the payload and submitting to the oracle contract.
Technical Deep Dive
Oracle node uses its private BLS key to sign the Merkle root of a batch of data points. The smart contract’s `verifyAttestation(bytes payload, bytes signature)` uses `blsVerify()` to confirm.
Caveat
Attestations only guarantee data at timestamp; consumers must handle staleness.
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