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867d8f3223
Currently, we have a bit of a convoluted flow where when sending attestations, we start broadcasting them over gossip then pass them to the attestation validation to include them in the local attestation pool - it should be the other way around: we should be checking attestations _before_ gossipping them - this serves as an additional safety net to ensure that we don't publish junk - this becomes more important when publishing attestations from the API. Also, the REST API was performing its own validation meaning attestations coming from REST would be validated twice - finally, the JSON RPC wasn't pre-validating and would happily broadcast invalid attestations. * Unified attestation production pipeline with the same flow for gossip, locally and API-produced attestations: all are now validated and entered into the pool, then broadcast/republished * Refactor subnet handling with specific SubnetId alias, streamlining where subnets are computed, avoiding the need to pass around the number of active validators * Move some of the subnet handling code to eth2_network * Use BitArray throughout for subnet handling