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babe: account for skipped epochs when handling equivocations #13335
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* babe: account for skipped epochs when handling equivocations * typos * babe: enforce epoch index >= session index
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* babe: account for skipped epochs when handling equivocations * typos * babe: enforce epoch index >= session index
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When validating an equivocation proof we need to validate a key ownership proof for the validator that committed the offence at a given epoch. The key ownership proof exists in the context of a given session, therefore we must also validate the mapping between an epoch and a session. Normally these are synced (i.e.
epoch index == session index), but if epochs are skipped this invariant is broken. This PR adds tracking of skipped epochs so that we can properly validate equivocation proofs after epochs are skipped.