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Instead of saving, for every sent message, if it was sent or not, we track the latest block/round participated in. These two keys are comprehensive to all prior block/rounds. We then use three keys for the latest round's proposal/prevote/precommit, enabling tracking current state as necessary to prevent equivocations with just 5 keys. The storage of the latest three messages also enables proper rebroadcasting of the current round (not implemented in this commit).
Coordinator
The Serai coordinator communicates with other coordinators to prepare batches for Serai and sign transactions.
In order to achieve consensus over gossip, and order certain events, a micro-blockchain is instantiated.