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Definitely not a new system :D But of course, not 10 years old. Since the third generation of coins has born, the hashgraph is on the radar, since a few years.

More project are third generation: cardano, for example. The Iota with the tangle protocoll, the nano with the block-laticel (or wth is the correct name, these are the dag-based coins), or one of the oldest, the pascalcoin, what use blockchain and a secondary node-system (almost exactly same like the gossip-protocoll) for the confirmation, same time.

And yes, the hashgraph. The hedera team, what write in the author too, as swirlds, have the own, private hashgraph-based crypto, under development.

Exciting evolving, its sure :)

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