using block after nullrounds to find randomness #3619
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Partially fix #3613
What's left to be done is to
e = MinDrandEntryEpoch()in the chain storeeAlternatively, to avoid looking forward (which seems to be complicated), it would be possible to start from the next epoch where drand is inserted, and look backwards until we reach
eand we need to compare the beacon rounds to make sure we get the right one.