Nano is attacking the scalability issues that crypto needs to address moving forward, by giving each node it's own blockchain. Transactions will be 2 parts and require transaction generation from the sender and receiver, this eliminates the problems of spam in a fee-less environment.
Micro transactions can occur after you authorize the reception of transactions. This could be considered a concept similar to channels in the lightning network.
While Ethereum will use forks and second layer technologies, many cryptos are now attepmting to get the best infrastructure, right out of the gate. Cardano, IOTA, EOS and more are iterations of technologies that I would consider third generation.
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