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A Beacon Chain validator can also be a shard validator. Recall, that initially there won't be any shards. State of Ethereum Protocol #2: The Beacon Chain is a helpful article on these topics and describes that: validators participate in the protocol by proposing blocks, when chosen to do so, on both the Beacon Chain and, once they have been implemented, ...


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Generally, there are beacon chain validators and shard validators. All beacon chain validators would have the beacon chain. A beacon chain validator would usually not be able to have all shards (they choose which shards to follow), since the purpose of sharding is so that a single validator doesn't have to validate all transactions in all shards. Beacon ...


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