RE: We can make crypto tangible and spending private using smart contracts: here's how
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This is very interesting. My thoughts: (1) that sure sounds like a lot of steps, (2) writing down seed in paper makes it tangible, isn't that the same as bitcoin seed words or a paper wallet, (3) have you checked ecash (for small amounts) and particularly this tool to print paper ecash "dollar bills": https://brrr.gandlaf.com I like https://cashu.me wallet for messing around.
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It probably sounds a lot because of how I explained it, it generally is a one transaction process, everything else just depends on how the funds will be used.
That said, this is different from Bitcoin paper wallet because that is just a wallet, whilst with the concept explored here, we are dealing with smart contracts specially designed for spending crypto like tangible cash.
I believe I've heard about eCash a couple of times, never really got into it, will have to take a look now that you're mentioned it.