First.. what’s data availability?According to ethereum.org, data availability (DA) is “the guarantee that the block proposer published all transaction data for a block and that the transaction data is available to other network participants.” But how exactly do you guarantee data is available? For most Layer 1s (L1s), it’s pretty straightforward. L1 nodes know transaction data is available by downloading and executing it themselves. This is how nodes verify blocks and is at the core of how bl...