Cash payment is an obvious counter-example. Yes, the seller needs to keep records for tax purposes. But the buyer does not. For an example of a crypto payment

Cash payment is an obvious counter-example. Yes, the seller needs to keep records for tax purposes. But the buyer does not. For an example of a crypto payment system (though not crytpocurrency) that attempts to provide anonymity in a way that doesn't make governments unhappy take a look at GNU Taler.