>
> Sounds like marketing bullshit to me. It does not have even statistical
> meaning; well, you can "save" a lot of satoshis, but nobody tell you that
> the merchant cut you on BTC/USD exchange rate in tens of %.
>

Your own wallet can look up the exchange rate and compare it to what you're
getting (and in fact, wallets do!).

Besides, assuming the customer is *always* being scammed seems extreme.
There are plenty of merchants that genuinely care about their reputation
and genuinely want people to pay with Bitcoin so they can avoid card fees.


> Payment protocol should not contain these fictional data
>

Well, I think the protocol should contain whatever is useful.

I'll probably draft a BIP for this next week or so.