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Alice and Bob may have a surprise in store --- the trust issues, the cost issues and the hoops they'll need to jump through in order to buy Monero, store it in a custodial wallet and then convert it back into fiat if needed.
Because your auntie is using BTC to pay for her coffee? If anything she's using cashapp.
I didn't find a major trust or cost issue. I just use kraken. Or you can use any other fiat-to-crypto exchange and then take it to a crypto-to-crypto exchange.

I think the bigger obstacle to most people is just the idea that cryptocurrency is difficult, and the idea that buisnesses are trustworthy by default.

Something I don't understand. What's the point of obfuscation if ultimately you can be caught when you try to convert it to fiat? If I have Btc and I convert it to monero to prevent tracking, how do I get it back to money in my bank account without being traceable?
Let me give you a realistic answer. There are soft and hard criminals. For example: soft criminals buy drugs, hard criminals sell drugs. The soft criminals convert from traditional to digital money (plus maybe a little obfuscation), order and hope for the best. The hard criminals have to solve the difficult problem of reversing that conversion. They'll just have some homeless person open a bank account and then use that for the conversion. If the homeless person gets busted, it better keep its mouth shut - or else.
Monero is the only real cryptocurrency.
I'm no expert, but this sounds significantly weaker than ZCash at first glance.
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Re: S=sG-the article says that s is private and S and G are public. Wouldn’t then be very simple to find private s=S/G? s will then be very easy to derive.