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Good question! Maybe someone with more experience in crypto can answer this one?

Blockchain generations are mostly about marketing PR.

However, way back in 2013 there were a whole bunch of new blockchains trying to do things other than just be currencies. BitShares, NXT, MaidSafe, Ethereum, and a number of others fell into this generation and were collectively called "Bitcoin 2.0". It wasn't about their technologies as much as their new applications for the blockchain.

Within any given developer community there are generations along the technology axis. In the Graphene universe you have the following generations:

Generation 1 - Protoshares, a simple clone of Bitcoin with a few modest twists.
Generation 2 - BitShares 1.0, the first edition of Delegated Proof of Stake (DPOS) technology.
Generation 3 - BitShares 2.0, completely new industrial strength Graphene DPOS2 technology.
Generation 4 - Steem - Graphene ++.

NXT just came out with it's answer to Graphene. Any cross-chain "Generation" numbers are mostly in the eyes of the marketeers.

Thanks, great stuff!

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