WHY DON’T YOU USE ZERO-KNOWLEDGE PROOFS, MULTIPARTY COMPUTATION, OR FULLY HOMOMORPHIC ENCRYPTION?

All these purely cryptographic approaches either generalize poorly or remain very academic. Moreover, the privacy they provide comes at the cost of scalability (bigger transaction sizes, longer processing times, and more communication overhead). TEEs, on the other hand, are a production-ready commodity technology. We are following pure-crypto solutions with interest and are open to adopting them once they leave the lab and prove to be ready for scalable and generic applications.