Hedera is a decentralized public network where developers can build secure, fair applications with near real-time consensus. The platform is owned and governed by a council of global innovators including Avery Dennison, Boeing, Deutsche Telekom, DLA Piper, FIS (WorldPay), Google, IBM, LG Electronics, Magalu, Nomura, Swirlds, Tata Communications, University College London (UCL), Wipro, and Zain Group. The Hedera Consensus Service (HCS) acts as a trust layer for any application or permissioned network and allows for the creation of an immutable and verifiable log of messages. Application messages are submitted to the Hedera network for consensus, given a trusted timestamp, and fairly ordered. Use HCS to track assets across a supply chain, create auditable logs of events in an advertising platform, or even use it as a decentralized ordering service.
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.