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Gravity Bridge Oracle

1 min read
Pronunciation
[grav-i-tee brij awr-uh-kl]
Analogy
Like a ferry service that carries updated manifests and passenger lists between two ports to ensure both sides have matching records.
Definition
An oracle component of the Gravity Bridge that relays Ethereum price and validator set updates to Cosmos chains, enabling secure cross‑chain asset transfers.
Key Points Intro
Gravity Bridge oracles supply inter‑chain data and validator attestations for safe token bridging.
Key Points

Valset updates: Reports current validator set weights to destination chain.

Price feed: Optionally provides token price data for pegging.

Threshold signatures: Validators sign data off‑chain before relay.

Relayer network: Independent nodes watch events and submit proofs.

Example
A Cosmos chain uses Gravity Bridge Oracle updates to adjust minting of bridged ETH tokens based on the latest Ethereum validator set and ETH/USD price.
Technical Deep Dive
Validators sign an Ethereum `ValidatorSetUpdated` event root using BLS threshold scheme. Relayer nodes submit `submitValset` and `submitBatch` transactions to the Cosmos module, which verifies signatures and updates on‑chain state.
Security Warning
Compromise of a threshold of validators can lead to incorrect valset propagation; enforce slashing and rotate keys.
Caveat
Oracle update frequency balances freshness with gas costs on destination chain.
Related Terms
IBC

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