It is not a blockchain... here we are beyond the blockchain !!!    It's Holochain... a DHT system (similar to BitTorrent) but in fact Holo is the main competitor of Hashgraph with the advantage that Holo is opensource and not owned by a company, it already has a product (or better... has already many products) and has already completed its ICO with an excellent result and is doing very well in exchanges after ICO ... so even though Holo is less known and despite the huge hype that goes around Hashgraph ... well maybe Hashgraph came too late! 

Here you find some answers... 

https://en.wikipedia.org/wiki/Distributed_hash_table

https://github.com/Holochain/holochain-proto/wiki/FAQ

https://github.com/holochain/holochain-proto/wiki/Comparisons

https://medium.com/holochain/holochain-the-blockchain-picks-up-a-dimension-4dca43fe3a73

About going well in exchanges after ICO... 

https://coinmarketcap.com/currencies/holo/