Rust:
https://github.com/sunrise-choir/ssb-legacy-msg/blob/master/...
https://github.com/sunrise-choir/ssb-publish/blob/master/src...
https://sunrise.social/
Go:
https://github.com/cryptoscope/ssb/blob/master/message/legac...
https://planetary.social
Spec:
https://spec.scuttlebutt.nz/feed/messages.html#json-encoding
https://spec.scuttlebutt.nz/feed/datamodel.html#signing-enco...