ARPA is a Secure Computation Network Compatible With Blockchains They propose a blockchain-based secure computation network of Multi-party Computation (MPC). ARPA cryptographically enables private smart contract, unprecedented data-at-use privacy protection, as well as scalable computational sharding.
S4FE is a freely accessible, blockchain based search engine dedicated to the protection of property. It provides a global network for the registration of items and the recovery of lost or stolen property.