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I know that banks in Europe are bound by law to follow PSD2, which is a set of guidelines to propose APIs. I found a stackoverflow post to generate the required certificates for that but those are only supposed to be for testing purposes https://stackoverflow.com/questions/50045376/how-to-create-eidas-certificate-with-qwac-and-qsealc-profiles-psd2-specific-att
You can use the PSD2 api to fetch the transactions from your account directly, that would be a lot less troublesome. There is also the woob (formerly weboob) project that has web scraping for a lot of banks (specifically french but also some American ones like amex)
It already exists. There is a company that sells a space heater that mines crypto currency. You get like 50% or the profits which sucks, but you at least recoup a bit of the cost of the electricity to run the heater.
I think we should try to heat ourselves with computing as much as we can since the side effect of computing is heat generation (and minor RF losses). How cool would it be to make a large supercomputer out of millions of homes heating up in the winter?