DA (Data Availability)
DA is the mechanism ensuring rollup transaction data is accessible on Ethereum, preventing withholding attacks and enabling verification.
What is DA (Data Availability)?
In Ethereum rollups, data availability (DA) requires posting compressed transaction data—typically 16-32 KB per block—to the Layer 1 chain, which is Ethereum mainnet. This allows light clients to reconstruct states without trusting operators.
Post-Dencun upgrade in 2024, blobs provide 384 KB per block at 0.75 Ggas cost, reducing fees by 90% for rollups like Optimism. Rollups can opt for Ethereum’s external DA layer like Celestia, but Ethereum-native DA ensures censorship resistance.
Related Terms
Block Proposer in Ethereum
The validator pseudo-randomly selected to propose and broadcast a new block during a specific 12-second slot in Ethereum's proof-of-stake consensus mechanism.
Contract Resolution
The process of determining the outcome of a prediction market contract to distribute payouts based on the event’s result.
Gas (Ethereum)
A unit measuring the computational effort required to execute transactions or smart contracts on Ethereum.
Bitcoin Block Reward
The amount of newly created Bitcoin awarded to miners for successfully adding a new block to the blockchain.
Federal Funds Interest Rate
The interest rate at which depository institutions lend reserve balances to each other overnight, targeted by the Federal Reserve to influence economic activity.
Alpha
An advantage in digital asset trading gained through early or exclusive access to information, strategies, or opportunities not yet widely known by market participants.