BlockchainAdvanced#L2#Scaling
Data Availability (DA)
D
Definition
The guarantee that the data required to verify a block is available to all network participants, critical for Rollup security.
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Concept Diagram
Key Takeaways
1
Data Availability ensures that the data needed to verify transactions is accessible to all network participants
2
DA sampling via erasure coding allows nodes to verify data without downloading everything
3
Celestia and EigenDA are dedicated DA layers that provide scalable data availability for rollups
4
DA is a critical bottleneck for blockchain scaling — without it rollups cannot prove their transactions
Practical Example
Arbitrum posts thousands of transaction data to EigenDA instead of Ethereum L1 — reducing costs by 90% while maintaining verifiable data availability for anyone who wants to check the rollup's correctness.
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Related Terms
Blockchain
EigenLayer AVSActively Validated Services that use restaked ETH to secure their system without needing to bootstrap their own validator set.
Blockchain
SequencerA node in a Rollup (L2) responsible for ordering transactions before they are batched and sent to the L1 (Ethereum).
Blockchain
Layer 2 (L2)A secondary framework or protocol built on top of an existing blockchain (L1) to improve scalability and transaction speed.
Blockchain
ShardingA method of scaling blockchain networks by splitting the database into small pieces (shards) to process transactions in parallel.
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