BAC-L2-TIA-103Celestia and modular blockchains
Data availability sampling
How a light node reaches near-certainty that data exists while downloading only a tiny fraction of it.
- Level
- L2 — Appchain developer
- Duration
- 4 h
- Maintainer
- Modular Blockchain / Celestia Architect
Learning objectives
- 01Explain erasure coding's role in sampling
- 02Compute the confidence obtained after n samples
- 03Justify why confidence grows with the number of light nodes
Guided lab
Simulate sampling against a partially withheld block and plot detection probability.
Independent lab
Vary the withholding rate and determine the sample count needed for a target confidence.
Security angle
Sampling gives a probabilistic guarantee: state the assumption about honest node count explicitly.
Assessment
Simulation with a detection curve and a quantified interpretation.