Clear DefinitionsCelestia
1 min read
Pronunciation
[seh-less-tee-uh]
Analogy
Celestia is like a public bulletin board that guarantees your message is posted and immutable, while letting others build their own interpretation layers on top.
Definition
A blockchain network that decouples consensus and data availability from execution, providing a data availability layer for rollups and other L2 solutions.
Key Points Intro
Celestia introduces novel modular blockchain principles:
Key Points
Data availability layer: Nodes only verify data availability and ordering.
Consensus-only: No native execution environment.
Light clients: Use data availability sampling to verify block inclusion.
Rollup-friendly: Tailored for L2 execution networks to post data.
Example
A rollup operator posts transaction batches to Celestia; Celestia ensures data is available, and users can independently reconstruct state via light clients.
Technical Deep Dive
Celestia’s consensus uses a Proof‑of‑Stake Tendermint fork, ordering data blobs in blocks. Data is wrapped in erasure‑coded shares via Reed‑Solomon, enabling light clients to sample random shares to probabilistically verify availability. Execution is left to external rollups which read Celestia’s block data.
Security Warning
Light clients rely on sampling; extremely small sampling rates can be exploited if adversaries control data withholding.
Caveat
Celestia does not execute transactions—users must trust rollup sequencers for correct execution.
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