Unirep
  • 👏Welcome
  • 🧩Introduction
  • 🎮Getting Started
    • Install & build 🛠
    • Start with cli commands 🔌
      • 0. Install and build
      • 1. Spin up the testing chain
      • 2. Deploy Unirep contract
      • 3. User generates semaphore identity
      • 4. User signs up
      • 5. Attester signs up
      • 6. User generates epoch key and epoch key proof
      • 7. Attesters/Users verify epoch key proof
      • 8. Submit epoch key proof to Unirep smart contract
      • 9. Attester attest to epoch key
      • 10. Epoch transition
      • 11. User state transition
      • 12. User generates reputation proof
      • 13. Attesters/ Users verify the reputation proof
      • 14. User generates sign up proof
      • 15. Attesters/ Users verify the sign up proof
    • Start with Typescript 📠
      • 0. Install packages
      • 1. deploy
      • 2. User signs up
      • 3. Attester signs up
      • 4. Epoch key proof
      • 5. Attest
      • 6. Epoch transition
      • 7. User state transition
      • 8. Reputation proof
    • Computation happens off-chain ℹī¸
  • ☀ī¸Protocol
    • Glossary
      • Users and Attesters
      • Epoch
      • Epoch Key
      • Reputation
      • Trees
      • Nullifiers
      • Epoch Transition
      • User State Transition
    • Circuits
      • Epoch Key Proof
      • Reputation Proof
      • User Sign Up Proof
      • User State Transition Proof
    • Contract
      • Sign up
      • Attestations
      • Epoch transition
      • User state transition
      • Verify proofs
  • 🌈Package usage
    • @unirep/crypto
    • @unirep/circuits
    • @unirep/contracts
    • @unirep/core
    • @unirep/subgraph
    • cli
      • Deploy Unirep Contract
      • User Identity
      • User Sign Up
      • Epoch Key And Proof
      • Attestation
      • Epoch transition
      • User state transition
      • Reputation Proof
      • Airdrop Reputation
      • Spend Reputation
  • đŸŒģApplications
    • Unirep Social
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  1. Protocol
  2. Glossary

Epoch Key

Definition of epoch key in UniRep

PreviousEpochNextReputation

Last updated 2 years ago

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

See also

☀ī¸
epoch key proof
Epoch
Epoch Transition
User State Transition
Epoch Key Proof