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.
HappyCoin is a digital currency designed for use of peer-to-peer technology to operate with no central authority; managing transactions and issuing money is carried out collectively by the network.