Aggregators and DVT

Obol Network are doing a bunch of work on distributed validator technology and have hit some challenges with the way the beacon REST API determines if validators are scheduled to be aggregators.

Oisín Kyne has written up a detailed explanation of the problem with some proposed changes. Mostly noting it here so I can find the post again later.

Personally I’d like to avoid adding the new /eth/v1/validator/is_aggregator and just have that information returned from the existing /eth/v1/validator/beacon_committee_subscriptions endpoint given it has to be changed anyway and the beacon node will have to check that as part of handling the call anyway. Otherwise it seems simple enough to implement and is worth it to enable DVT to be delivered as middleware rather than having to replace the whole validator client.