ROWDAS (EIP-8371): DISTRIBUTED BLOB RECONSTRUCTION, MEASURED

Summary from the TLDR Crypto newsletter

EIP-8371 (RowDAS) proposes adding 128 row-based subnets to Ethereum's PeerDAS architecture to eliminate the redundant blob reconstruction work that every qualifying node performs on its own. Under the present design, an estimated 2,000+ nodes each spend 5.18 seconds of CPU per slot reconstructing 32 blobs. RowDAS distributes that load, cutting per-reconstructor time to 40 milliseconds and network-wide CPU from 10,400 to 81 seconds at 32-blob scale. The design uses a two-dimensional cell matrix where column subnets retain custody authority while row subnets pool reconstruction, allowing ordinary nodes to reach the erasure-coding threshold without high-stake infrastructure. A Prysm prototype with real KZG cryptography exists, though mainnet-scale testing is pending, and a duty-sharded fallback variant preserves 91% of CPU savings for staged rollout before the full row layer activates.