attester

Attesters vote on the validity and head of the chain during each slot.证明者在每个时隙对链的有效性和链头进行投票。

Validators take turns as attesters and proposers, earning rewards for both roles when performed correctly.验证者轮流担任证明者和提议者，在正确履行职责时可获得这两种角色的奖励。