Prepare summary for IPFS PoC

[jpraynaud]

Why

The IPFS PoC surfaces difficulties and subtleties that must be resolved before an MVP, and these need to be documented and turned into a design.

What

Document the difficulties identified during the PoC and produce a design book for the IPFS MVP.

How

• Document all difficulties/subtleties to deal with for the MVP:
  • Document the migration strategy for the compressed immutables (recompute them to be deterministic)
  • Assess whether the uncompress operation of the IpfsFileDownloader is fully streamed and how well it works
  • Progressive rollout strategy (until enough peers serve Mithril artifacts) with weights for ImmutablesLocation
  • Define the support for compressed and uncompressed immutable files
  • Expected download times for mainnet snapshot (and strategy to overcome it, e.g. groups of immutables to reduce loookup latency, ...)
  • Client is only downloading or also serving as a peer (vs internet connectivity and impact on the expected download time)
  • TBD
• Create a design book for the MVP on Hackmd