Excluding wallet services (e.g. Coinbase) and dime-a-dozen things of that nature.
There are some industrial byproducts of the cryptocurrency space which are plausibly businesses.
e.g. "Cryptocurrency exchanges have a problem with KYC. Gee it sure would be great to figure out a way to demonstrate identity over the Internet." is a plausible thesis. If you successfully build that, don't sell it to cryptocurrency companies. They are incorrigible muppets who largely don't want to be effective at KYC. The broader financial industry (and e-commerce, and the million other use cases for identity) care much more, have deeper pockets, and are less conflicted about consuming this SaaS.
This question is part of an AMA with Patrick McKenzie.View entire AMA with Patrick McKenzie.
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Or do you use the Linux subsytem in Windows, emulation tools like DosBOX and WINE, or mobile device emulator/simulators? What's your favorite ways you've used virtual machines and emulation?