Check attestation shuffling when producing blocks #900
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Issue Addressed
Closes #845
Proposed Changes
During block production, use the fork choice block DAG to check that the implied shuffling for an attestation is the same as the state on which the block is being produced. This ensures that the signature check that was done upon inserting into the op pool remains valid, and prevents attestations from forks with different shufflings from appearing on chain with seemingly invalid signatures.
Additional Info
To avoid having the op pool contain a reference to fork choice, the
get_attestations
function takes a filtering closure. I thought this was quite neat (and functional 😏)!TODO
attestation_shuffling_is_compatible