Breakdown of Data Availability and its role in Ethereum roadmap

Nice thread on DA and DAS

https://twitter.com/mt_1466/status/1501188854878982155?s=20&t=v72oabg259Ir2cDK8CV43g

Tl;DR

As long as all the execution data is made available on the mainnet, the chain does not require every node to execute every transaction in order to validate transactions and reach consensus.

Because rollups can cryptographically-guarantee (via a proof) that the transactions are valid, these transactions can now be executed by just a single node and posted to the L1 where it can be cross-checked by L1 nodes.

However, a rollup’s TPS is dependent on the data capacity of their L1 for throughput. The more data capacity on L1, the higher the (theoretical) throughput for rollups. Once an L1 runs out of data capacity for the rollup, the limit has been reached and no additional transactions can be processed. Therefore, now the limiting factor for a blockchain’s scalability is its data availability.

In summary, data availability is extremely important for new modular blockchains for two reasons. First, adequate DA is required to ensure rollup sequencer’s submissions can be cross-checked and challenged if needed. Secondly, DA is now the bottleneck to a blockchain’s scalability. Maximizing the DA on a L1 is critical for rollups to reach their full potential.