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Use head to validate atts for previous epoch (#16109)

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In the event that the target checkpoint of an attestation is for the
previous epoch, and the head state has the same dependent root at that
epoch. The reason being that this guarantees that both seed and active
validator indices are guaranteed to be the same at the checkpoint's
epoch, from the point of view of the attester (even on a different
branch) and the head view.
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Potuz
2025-12-29 17:07:21 -03:00
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### Added
- Use the head state to validate attestations for the previous epoch if head is compatible with the target checkpoint.