# Backwards Compatibility

- HTTP
- Bittorrent
- IPFS
- ActivityPub

## HTTP Servers

- Using existing HTTP servers as web-seed like things.
- Use codecs to indicate the format and metadata of existing files
- Use HTTP servers as backup mirrors that behave like peers, and how peers can indicate them as mirrors for a given container

## BitTorrent

See [BEP 52 - Bittorrent V2](http://bittorrent.org/beps/bep_0052.html)


## IPFS


## ActivityPub

- Mappings:
	- Container <-> feed