Hcash is a new decentralized, open source and cross system digital cryptocurrency. It will become the connection point of all blockchain systems, allowing the free exchange of value and information between different blockchain systems. Hcash completed hcash2 in August 2018 0 main chain upgrade - the original hshare chain is officially upgraded to hypercash main chain (HC), and the hyperexchange main chain (HX) hatched by hcash forms a double chain structure. As the two core hubs of hcash ecology, they will cooperate with each other to establish the value interconnection of hcash ecology with BTC, Eth and other blockchain systems and non blockchain distributed ledgers (DAGs). HC chain fully realizes the anti quantum characteristics and privacy protection, supports the hybrid consensus of pow + POS, focuses on the in-depth research and development of the underlying technology of blockchain, and provides hyperexchange with value tokens required to maintain system stability. At the same time, hcash will upgrade all the technical features proposed by HC: anti ASIC, intelligent lightning network protocol hailp (hcash AI lighting protocol) and intelligent contract have been listed in the next development plan. Together with hyperexchange, hypercash will provide hcash with a value interconnection solution between blockchains, and on this basis, realize the free flow of information and value between blockchain and non blockchain distributed ledger (such as DAG), so as to lay a foundation for the construction of multi asset distributed business application ecology.