Fully decentralized p2p cryptocurrency transactions without double spending by proof of work (improvement upon Hashcash) was done first with Bitcoin. The term fintech did not exist at the time. EDIT: looked it up, apparently first use as Fin-Tech was 1967 https://en.wikipedia.org/wiki/Fintech – it’s not the current use of the term though.
As a wage slave with no bitcoin or crypto, the technology has been hijacked by these types and could otherwise have been useful.
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What other solutions to double spending were there in financial cryptography before?
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Fully decentralized p2p cryptocurrency transactions without double spending by proof of work (improvement upon Hashcash) was done first with Bitcoin. The term fintech did not exist at the time. EDIT: looked it up, apparently first use as Fin-Tech was 1967 https://en.wikipedia.org/wiki/Fintech – it’s not the current use of the term though.
I guess additional bonus for crypto would be not burning the planet, and actuallt have a real value of something, not the imagined one.