HCASH is a new decentralized, open-source, and cross-system digital cryptocurrency that will be the connection point for all blockchain systems, allowing value and information to be exchanged freely between different blockchain systems. Currently, HCASH has completed the HCASH2.0 main chain upgrade. The upgraded HCASH will adopt the "strongly coupled, dual-focus", dual-chain dual-coin mechanism, to realize the development and upgrade of HCASH on the structure of two twinning chains - the original Hshare chain will be officially upgraded to HyperCash, the main chain (HC), together with the HyperExchange backbone (HX) hatched by HCASH, and form a double-stranded structure. The HC chain will fully realize anti-quantum characteristics and privacy protection, support the hybrid consensus of PoW+PoS, focus on the in-depth development of the underlying technology of the blockchain, and provide HyperExchange with the value tokens needed to maintain system stability. At the same time, HCASH will carry out targeted upgrades for all proposed technical features of HC. Anti-ASIC, HAILP (HCASH AI Lighting Protocol) has been included in the next development plan; HyperExchange will use three core components, Blockchain Multi Tunnel Protocol, Hyper Exchange Axis, and Indicator, to provide HCASH with inter-chain value interoperability interconnection solutions, and on this basis, to realize the free flow of information and value between blockchain and non-blockchain distributed ledgers (such as DAG), which will lay the foundation for constructing a multi-asset distributed business application ecosystem.