Remove next epoch lookahead from PTC duties - #586
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**What does this PR do? Why is it needed?** Implemented the spec change: ethereum/beacon-APIs#586 (Removed next epoch lookahead from PTC duties)
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**What does this PR do? Why is it needed?** Implemented the spec change: ethereum/beacon-APIs#586 (Removed next epoch lookahead from PTC duties)
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ptc duties can no longer lookahead, with PR ethereum/beacon-APIs#586 - updated description.
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The PTC assignments are not stable for the next epoch so we should not be required to serve these duties via the api as we will need to re-compute them for the current epoch anyways. This PR effectively removes the requirement for clients to serve next epoch PTC duties.
Related ethereum/consensus-specs#4992