The hashgraph, like the blockchain, is a technology for storing and transmitting information without a control body. Technically, it is a distributed database, based on the “Gossip about Gossip” and “Virtual Voting” techniques. Leemon Baird invented it.
It claims to be able to trade at high speed, fairness, stability, and low cost, while also eliminating the flaws of blockchain, which is a distributed network technology.
Hashgraph is a proprietary technology subject to patents.