I find it very impressive that ArcBlock uses Algorand consensus. Gossip-based byzantine proof networks are a very promising way to develop an infrastructure.
gossip based proof i think is from hashgraph? I wonder if arcblock managed to figure out what they are doing. The technology is proprietary as far as I can remember.
Nah, it's algorand, not hashgraph. They are both gossip-based but that about it. Algorand is not patented to my knowledge and I'm not sure it can be given it's in the freely available papers.