Please scroll down to the section on "Cryptos" for some thoughts on cryto-currencies...
https://survivalblog.com/economics-investing-preppers-113/DO NOTE the warning about using such instruments. Emphasis on the WARNING!!!
Personally, I think this is gambling, not investing, and do not advise (IMHO) their use. Since all investing is gambling, this is a narrow distinction but I think a significant one.
DO NOTE ALSO that the various governments are trying Very hard to extract a tax on all cryto transactions... Gee, where did that come from? If you are surprised, then I have some ocean front property in Arizona that you might find interesting...
YMMV