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.
PumaPay is a comprehensive billing protocol that combines the best of traditional payment methods (credit cards) with blockchain-based solutions, and enables a more frequent use of cryptocurrencies in online & offline outlets. We offer a free-of-charge blockchain-based protocol that decentralizes a whole layer of transaction processing services and supersedes traditional and current blockchain-based billing methodologies