ARPA is a secure computation network compatible with blockchains. ARPA cryptographically enables private smart contract, unprecedented data-at-use privacy protection, as well as scalable computational sharding.MPC (Multi-party Computation) allows a set of parties to jointly compute a function over their inputs while keeping them private. The correctness of computation is verifiable even under majority malicious condition.ARPA network is flexible, easy-to-use, and compatible with existing blockchains such as Ethereum and EOS.Lightning fast performance for mass adoption via verifiable computation. Off-chain computation network capable of industrial-level computation and storage.