# Protocol Berg v2: Non-local redundancy: Erasure coding and dispersed replicas for robust retrieval

- Channel: [ETHBerlin](https://streameth.org/ethberlin)
- Date: 2025-10-09
- Duration: 24:26
- Topics: Protocol Berg, Berlin, Conference, Blockchain, Protocol, Web3, Decentralization, P2P
- Watch: https://streameth.org/watch/yt-oWZYVBlXwDQ
- YouTube: https://www.youtube.com/watch?v=oWZYVBlXwDQ

## Description

In this presentation, we describe in detail how non-local redundancy is implemented in the Swarm peer-to-peer network. Among other things, we show how to apply classic Reed-Solomon erasure codes to files in Swarm, discuss security levels of data availability and derive their respective parameterisations, describe a construct that enables cross-neighbourhood redundancy for singleton chunks to complete erasure coding, and explore alternative retrieval strategies applicable to erasure-coded files and their impact on latency as well as price of retrieval.

Protocol Berg v2
12-13 June 2025
Berlin
https://v2.protocol.berlin