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.
TokenPay is a blockchain project that incorporates Bitcoin cryptographic technology with advanced security and privacy features. Additionally, TokenPay is building out a platform that combines banking and a closed-end private exchange. This enables wider adoption of the coin via consumer and merchant services