Epoch Key

Definition of epoch key in UniRep

• Epoch keys are temporary personas which users use them to interact with others.

• Instead of giving attestations to an identityCommitment, a random-value-like epochKey is the receiver of an attestation.

• Epoch key is computed by

hash(identityNullifier, epoch, nonce) % epochTreeDepth

where nonce and be any value between 0 and numEpochKeyNoncePerEpoch - 1, so that a user can have numEpochKeyNoncePerEpoch epoch keys per epoch.

• Only the user knows his identityNullifier so only he knows if he is receiving an attestation, others would see an attestation attesting to a random value.

• In the epoch key proof circuit user can prove that he knows the epochKey and can rightfully receive and process the attestations attested to this epochKey.

See also

• Epoch

• Epoch Transition

• User State Transition

• Epoch Key Proof