Reputation

Definition of reputation in UniRep

Reputation

  • The reputation in UniRep protocol includes

    • posRep: is the positive reputation given by the attester

    • negRep: is the negative reputation given by the attester

    • graffiti: is the message given by the attester

    • signUp: indicates if the attester authenticates the user

  • The hash of the reputation is computed by the Poseidon hash function.

const hashReputation = hash(posRep, negRep, graffiti, signUp)

  • The overall reputation status of a user is stored in the user's User State Tree

    • where the index of the leaf is the attester ID

    • the leaf value is the accumulated hashReputation that the attester gives

Attestation

  • The attestation is almost the same as reputation, but it includes an attesterId

  • The hash of attestation is computed by

const hashAttestation = hash(attesterId, posRep, negRep, graffiti, signUp)

  • The attestations to an epoch key would be chained together. A hashchain would be formed by the hashes of the attestations.

    • For example, Hash chain is computed by

    const hashChainResult = hash(hashAttestation_3, hash(hashAttestation_2, hash(hashAttestation_1, 0)))

    • So user can not omit any attestation because the circuit requires each attestation in the hashchain to be processed. -> Non-repudiable

    • if user omits an attestation, then the computed hashchain would not match the one in the Unirep contract

See also

PreviousEpoch KeyNextTrees

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