In our partnership with Starknet, we have performed a number of security audits on some of the network’s cryptographic components.

One challenge we encountered was the lack of comprehensive specifications – a common hurdle in the ZKP space. To navigate this, we had to reverse-engineer the protocol, piecing together its logic from various sources and observations.

In this quest to understand the true protocol being implemented, we wrote and published draft specifications for a number of the protocols that we looked at. You can find them here.

The specifications are still work-in-progress, and with the support of the community, we aim to refine and enhance them in the near future.

We wrote 4 specifications in total:

Starknet Channels for Fiat-Shamir Instantiation and Starknet Merkle Tree Polynomial Commitments . Both specifications can be seen as self-contained components, building blocks used by the other Starknet schemes.

Starknet FRI Verifier. This document specifies the verification of FRI proofs in the Starknet ecosystem. It builds on top of both of the previous specifications.

Starknet STARK Verifier. This document specifies the verification of STARK proofs in the Starknet ecosystem. It builds on top of all previous specifications, instantiating the FRI specification.

Feel free to open PRs or issues on the RFCs repository in order to help us improve these specifications.