Identity provider containing a database of encrypted user data and using zkProof to witness data without revealing it.
Contains database of encrypted data from user ( birthdates in this case ) Structure of the data:
| Birthdate | Address |
|---|---|
{ "Encrypted Date of Birth: " : "...","HashOfPlainText": "..."} |
"0xab..." |
Freakbook also has an ethereum address and this address is used for freakbook identity provider initialization on chain.
Data Provider Initialization happens by making it known in freakbook smart contract that certain address is playing a role of an identity provider by calling setIdentityProviderAddress() method.
Freakbook users want to be able to share certain properties of their data to other third parties which can verify these properties without having actual data in posession.
User sign up process
- Encrypt date of birth with user private key
- Hash non-encrypted version of the date (poseidon hashing)
- Store encrypted message and hash of original date to freakbook
Share properties
- Sign with FreakBook => signing the encrypted birthdate info + current timestamp + hash of date
- App calculates zkproof
- App decrypts encrypted birthdate
- Create proof => birthdate (private input) + 3 public inputs - referenceTime + hash of date (decrypted date) + current timestamp (from server)
- Share proof
- External verification
$ cp circuits/circuit/circuit_js/circuit.wasm server/public/ $ cp circuits/circuit/circuit_0001.zkey server/public/ $ cp circuits/circuit/verification_key.json front/src/utils/zkeys/