Bitcoin Forum

Essentially, Hcash is a hive composed of blockchain and DAG system. It realizes the interconnection of information and value in distributed systems of blockless based blockchain and block based blockchain. Hcash acts as the medium here, and the Hcash platform itself is the the carrier of cross-platform information exchange. Hcash will build a new underlying technology platform to link various kinds of blockchain technologies; thus achieving the free circulation of values that base on trust in different blockchain systems.

The definition of blockchain
The blockchain is a cryptographically secure transactional singleton machine with shared-state.
“Cryptographically Secure” refers to using a complicated mathematical mechanism algorithm to ensure the security of digital currencies. You can consider it as the firewall, which almost makes the fraud system (such as faking a transaction, eliminating a transaction, etc.) an impossible thing.
“Transactional singleton machine” means that only an authorized machine is responsible for transactions in the system. In other words, there is only a truth.
“With shared-state” means that the storage status in this machine is shared and is open to everyone.

Hcash, what does the project say, the code is not updated fast, the marketing is very strong, it feels a bit like a ponzi scheme.