Nullifiers
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Nullifiers are used to prevent things from happening more than once
UniRep uses two different nullifiers
Epoch key nullifiers are used to prevent users from using the same epoch key twice and prevent users from double .
If an epoch key nullifier is seen before, then drop the second user state transition proof.
Nullifier of an epoch key is computed by
Reputation nullifiers are used to prevent users from double spending the reputation if an action requires users to spend reputation.
If a reputation nullifier is seen before, then the second reputation proof is recognized invalid.
Nullifier of a reputation spent is computed by
The nonce
can only be within 0
to posRep-negRep-1
with the given attesterID.