BAC-L2-TIA-107Celestia and modular blockchains
Publishing and retrieving blobs
The data availability layer's elementary operation: writing data into a namespace, then proving you got it all back.
- Level
- L2 — Appchain developer
- Duration
- 3 h
- Maintainer
- Modular Blockchain / Celestia Architect
Learning objectives
- 01Publish a blob into a chosen namespace
- 02Retrieve a namespace in full, with its proof
- 03Compute the publication cost of a given volume
Guided lab
Publish a series of blobs and retrieve them in full with completeness verification.
Independent lab
Measure the publication cost of one day's activity for a realistic application rollup.
Security angle
A namespace is not private: anyone can write to it, and anyone can read it.
Assessment
Verified publication and retrieval, with a cost record.