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The initial TODO was simply to use one ExternalBlock per all batches in the block. This would require publishing ExternalBlock after the last batch, requiring knowing the last batch. While we could add such a pipeline, it'd require: 1) Initial preprocesses using a distinct message from BatchPreprocess 2) An additional message sent after all BatchPreprocess are sent Unfortunately, both would require tweaks to the SubstrateSigner which aren't worth the complexity compared to the solution here, at least, not at this time. While this will cause, if a Tributary is signing a block whose total batch data exceeds 25 kB, to use multiple transactions which could be optimized out by 'better' local data pipelining, that's an extreme edge case. Given the temporal nature of each Tributary, it's also an acceptable edge. This does no longer achieve synchrony over external blocks accordingly. While signed batches have synchrony, as they embed their block hash, batches being signed don't have cryptographic synchrony on their contents. This means validators who are eclipsed may produce invalid shares, as they sign a different batch. This will be introduced in a follow-up commit. |
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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.