https://ethresear.ch/t/peerdas-a-simpler-das-approach-using-battle-tested-p2p-components/16541

Custody

• Each node downloads and custodies a minimum number of rows and columns per slot (e.g., 2 rows and 2 columns).
• Custody assignments are selected pseudo-randomly based on node ID, epoch, and custody size.
• Nodes store custodied rows/columns for the pruning period and respond to peer requests for samples.

Peer Discovery

• Nodes maintain a set of diverse and reliable peers (e.g., 70 peers).
• Peer discovery includes various custody sizes and row/column assignments.
• Discovery methods include DHT-based mechanisms like discv5 and additional methods like libp2p gossipsub.

Sampling

• Nodes make a specific number of sample queries per slot (e.g., 75 queries).
• Sample requests are determined by custodied_rows() and custodied_columns() functions.
• Nodes send DO_YOU_HAVE packets to peers to check for sample availability and distribute received samples to peers missing them.

Peer Scoring

• Nodes score peers based on their responses to sample requests.
• Non-responsive peers are downscored or disconnected.
• Peers are assessed for honesty, bandwidth capabilities, and consistency.

DA Providers

• DAS providers are high-capacity nodes available for DAS queries, appearing as regular nodes with high capacity.
• Providers can be discovered via standard mechanisms or configured out-of-band.