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InfluxDB
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Nano, there's a whole very long wiki page with info https://github.com/georgehara/nano/wiki/unofficial and their supposed defenses, up to you if you find any of it troubling or not. Personally I find the whole idea to not quite click, delegated voting applies an assumption that "those who have the most stake in the network won't act against it", when it seems to me completely logical that maybe someone with a huge stake sees no future in the project and tries to cash out in an instant before anyone notices. Using the block lattice claims to save space, it feels like it reduces security considerably without any type of main settlement. Also, no fees make it prone to spam attacks (and the solutions so far seem lackluster, the hardware for the small PoW needed is probably plenty available to any operation farming some other coin). No incentives for running a costly node makes that very unappealing for long term network health. Scalability issues still seem unsolved. Also hurt by things like no plans for smart contracts or any other interesting feature given the current state of cryptocurrencies. Marketing/adoption don't seem to be going much anywhere. Etc. I assume someone who has done a lot more research on the topic, or is a fanboy, will have some strong counterpoints, but I see various red flags and I don't like them at all.