Unitychain / zkvote-node

Using ZK-SNARK to Implement Decentralized Anonymous Voting on p2p Network

zkvote: Using ZK-SNARK to Implement Decentralized Anonymous Voting on p2p Network

zkvote is a powerful tool for anonymous voting. It uses a cryptographic function called a ZK-SNARK to keep the voter from revealing its identity. It is also built on a peer-to-peer network so that no single entity or authortity can control the access or result of the voting. Moreover, zkvote utilizes a developing standard called Decentralized Identifier (DID) and Verifiable Credential (VC) to prove the validity of the identity.

How it Works?

1. Generate keypair
   • Use zkvote-web to generate keypair / DID / identity commitment
   • Doesn't support import at this moment
   • Store in browser localStorage
2. Propose/Join
   • Proposer
     • Use zkvote-web to propose a new subject to be voted on
   • Joiner
     • Use zkvote-web to join an existing subject
3. Exchange VC
   • Joiner sends its identity commitment to proposer via other network
     • For example: email, SMS...
   • Proposer receives the identity commitment of the joiner from the network
   • Proposer generates a verifiable credential (VC) for joiner and sends it to joiner. This VC includes:
     • Subject hash
     • identity commitment of joiner
     • Signature of issuer
     • public key of issuer
   • Joiner receives the VC
4. Vote
   • Proposer
     • Generates the proof that corresponds to the subject
     • Uploads the proof and the VC to zkvote-node
   • Joiner
     • Verify the VC for the subject
     • Generates the proof that corresponds to the subject
     • Uploads the proof and the VC to zkvote-node
5. Open
   • Use zkvote-web to see the latest result

Contribution

See this document for more technical details