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ConceptsBackend Service Provider

Backend Service Provider

All on-chain interactions in Veil flow through a backend service provider that acts on behalf of users and issuers. This service:

  • Abstracts the complexity of ZK proof generation, private state management, and gas payment.
  • Stores private state (credit scores, score accumulators) associated with user Veil IDs.
  • Exposes API endpoints that users and issuers call to trigger contract interactions.
  • Pays gas fees for all transactions on behalf of participants.

This means neither users nor issuers need a Midnight wallet or direct blockchain interaction — they interact with the Veil API, and the backend handles the rest.

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IssuersScore Computation