Fediverse: several servers following one another, several users
following each other. Designates federated communities in general.
Vidiverse: same as Fediverse, but federating videos specifically.
Instance: a server which runs PeerTube in the fediverse.
Origin instance: the instance on which the video was uploaded and which
is seeding (through the WebSeed protocol) the video.
Cache instance: an instance that decided to make available a WebSeed
of its own for a video originating from another instance. It sends a ptCache
activity to notify the origin instance, which will then update its list of
WebSeeds for the video.
Following: the action of a PeerTube instance which will follow another
instance (subscribe to its videos).
All the communication between the instances are signed with Linked Data
Signatures with the private key
of the account that authored the action.