Epoch Transition

Definition of epoch transition in UniRep

• Epoch transition happens when someone calls beginEpochTransition() and the current block is epochLength blocks more since last transitioned block.

• In beginEpochTransition()

  • An EpochEnded event is emitted and currentEpoch increases by 1.

currentEpoch is increased by one.

• After the EpochEnded event is emitted, all epoch keys attested during this epoch will have their hash chain sealed

  • by sealed it means that the hash chain is hashed again with 1, e.g., hash(1, originalHashChain)

  • if an epoch key received no attestation, it's hash chain would be hash(1, 0)

• After hash chain of the epoch keys are sealed, these epoch keys and their hash chain will be inserted into the epoch tree of this epoch

  • there's only one epoch tree for every epoch.

• There will be a new global state tree for each epoch.

• And after epoch transition, user needs to perform user state transition to transition his user state into the latest epoch

See also

• Epoch

• Reputation

• Trees

• User State Transition