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The new set publishing a `Batch` completes the handover protocol. The new set should only publish a `Batch` once it believes the old set has completed all of its on-external-chain activity, marking it honest and finite. With the handover comes the acceptance of liability, hence the requirement for all of the on-Serai-chain activity also needing verification. While most activity would be verified in-real-time (upon ::Batch messages), the new set will now explicitly verify the complete set of `Batch`s before beginning its preprocess for its own `Batch` (the one accepting the handover).
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.