Era
Definition
Era: A (whole) number of epochs, which is the period that the validator set (and each validator's active nominator set) is recalculated and where rewards are paid out
Description
1 block - 6 sec 1 epoch - 2400 blocks - 4 hour 1 era - 6 epoch - 24 hours
There are some cases related to eraβs usage: Reward payout
Reward payout
Payments occur at the end of every era.
Rewards are recorded per epoch and calculated per era.
In order to be paid your staking rewards, someone must claim them for each validator that you delegate. Stakers claim their rewards for past eras by submitting a transaction with a validator ID and an era index. This naturally leads to spreading out reward distribution, as people make transactions at disparate times, rather than updating the accounts of all stakes in a single block.
Even if everyone submitted a reward claim at the same time, the fact that they are individual transactions would allow the block construction algorithm to process only a limited number per block and ensure that the network maintains a constant block time.
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