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Backing Subsystems
The backing subsystems, when conceived as a black box, receive an arbitrary quantity of parablock candidates and associated proofs of validity from arbitrary untrusted collators. From these, they produce a bounded quantity of backable candidates which relay chain block authors may choose to include in a subsequent block.
In broad strokes, the flow operates like this:
- Candidate Selection winnows the field of parablock candidates, selecting up to one of them to second.
- Candidate Backing ensures that a seconding candidate is valid, then generates the appropriate
Statement. It also keeps track of which candidates have received the backing of a quorum of other validators. - Statement Distribution is the networking component which ensures that all validators receive each others' statements.
- PoV Distribution is the networking component which ensures that validators considering a candidate can get the appropriate PoV.