Ledger LandISSUE #78 of 90

data availability · celestia · eigenda · avail

BlockyVSDouble-Spend Dan

Blocky saysData availability layers ensure transaction data is published so anyone can verify the chain.

For rollups and modular chains, data availability (DA) — guaranteeing the transaction data was actually published — is as critical as execution. Dedicated DA layers (Celestia, EigenDA, Avail) provide cheap, verifiable data publishing so chains don't have to post everything to expensive L1 space. DA is a pillar of the "modular blockchain" thesis: separate execution, settlement, consensus, and data.

Power-ups you unlock

DA = guaranteeing tx data was published
As critical as execution for rollups
Celestia/EigenDA/Avail provide cheap DA
A pillar of modular blockchain design

Double-Spend Dan attacks — common mistakes

Overlooking DA when judging an L2’s safety
Assuming execution correctness implies data availability
Confusing DA layers with execution layers

Boss battleExplain why "the data was published" matters as much as "the code ran".

Example code

<!doctype html><html><head><meta charset="utf-8"></head>
<body style="background:#06040d;color:#e6e0ff;font-family:monospace;padding:20px"><pre>modular stack:
  execution · settlement · consensus · DATA AVAILABILITY
if data isn’t published → no one can verify/rebuild state</pre></body></html>

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