# Case Studies

- [EthSign](/case-studies/ethsign.md): Enhancing EthSign with witnessed agreements
- [KYC-Gated Contract Calls](/case-studies/sumsub.md): KYC-gated smart contract interactions with Sumsub
- [Proof of Audit](/case-studies/ottersec.md): Cryptographically verify the integrity of OtterSec security audit reports
- [Developer Onchain Reputation](/case-studies/aspecta.md): Building your onchain reputation as a builder with Aspecta on Sign Protocol
- [Onboarding Web2 Data](/case-studies/mpc-tls.md): Onboard Your Web2 Data with MPC-TLS on Sign Protocol