Nullifiers
The definition of nullifiers used in Unirep
- Attestation nullifiers are used to prevent an attester attests to the same epoch key twice.
- Definition:
hash5(ATTESTATION_NULLIFIER_DOMAIN, identityNullifier, attesterId, epoch, epochKey) ATTESTATION_NULLIFIER_DOMAIN = 1
- Epoch key nullifiers are used to prevent an epoch key be generated twice.
- If an epoch key is used more than once, we cannot differentiate which user receives the reputation.
- Definition:
hash5(EPOCH_KEY_NULLIFIER_DOMAIN, identityNullifier, epoch, nonce, 0) nonceis used to limit the number of epoch keys, if the nonce is more thannumEpochKeyNoncePerEpochthe epoch key proof will be invalid.EPOCH_KEY_NULLIFIER_DOMAIN = 2
- Reputation nullifiers are used to prevent a user double spending his reputation to perform actions.
- If the same reputation nullifiers submitted to Unirep contract, the transaction will be rejected.
- Definition:
hash5(REPUTATION_NULLIFIER_DOMAIN, identityNullifier, epoch, nonce, 0) nonceis used to limit the number of spent reputation, if the nonce is more thantransitionedPosRep - transitionedNegRepthe reputation proof will be invalid.REPUTATION_NULLIFIER_DOMAIN = 3
Last modified 1yr ago