[Bitcoin-development] Floating fees and SPV clients

Gavin Andresen gavinandresen at gmail.com
Tue Dec 3 11:54:41 UTC 2013

> A merchant can always refuse the payment and refund it if that's a
> practical problem.

No, they can't, at least not in bitcoin-qt:  when the user pokes the SEND
button, the transaction is broadcast on the network, and then the merchant
is also told with the Payment/PaymentACK round-trip.

Allowing merchants to cancel (e.g. having a PaymentNACK) makes
implementation harder, and brings up nasty issues if we want to allow
CoinJoin or CoinJoin-like transactions as payments to merchants.
 Bitcoin-Qt ALREADY allows you to pay several PaymentRequests with one
transaction; handling the case where one merchant gives you a PaymentACK
and another gives you (or wants to give you) a PaymentNACK is a nightmare.

Gavin Andresen
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