I am very curious about this as well. In this example [0] someone was able to precompute 30k transactions in 5 hours with a single 1070. A mining farm with 100 video cards (capital cost of $40k) could generate a sustained load of 10k transactions per second. With precomputation, you could easily do an order of magnitude more damage. All of these transactions are stored permanently on the ledger as far as I can tell.

Nanoblocks does serve some purpose in my mind, but it has major issues to solve, and in no way is a catch-all solution for the scaling problems that Bitcoin has.

[0] https://hackernoon.com/stress-testing-the-raiblocks-network-...