[Bitcoin-development] Floating fees and SPV clients

Drak drak at zikula.org
Tue Dec 3 12:05:21 UTC 2013

On 3 December 2013 11:46, Mike Hearn <mike at plan99.net> wrote:

> On Tue, Dec 3, 2013 at 12:41 PM, Gavin Andresen <gavinandresen at gmail.com>wrote:
>> If users want to pay with a huge transaction then it seems to me the user
>> should cover that cost. Allowing users to pay merchants with 100K
>> transactions full of dust and expecting them to eat the cost seems like a
>> great way to enable bleed-the-merchant-dry attacks.
> A merchant can always refuse the payment and refund it if that's a
> practical problem. I doubt it would be though. If a user is trying to buy
> something from the merchant, they will want it to work, and it'll be up to
> the developers of the wallet they're using to ensure it never does anything
> obnoxious or unacceptable that would result in people hating to receive
> money from that app.

Refunds in this circumstance would be problematic because someone is going
to lose because they have to pay the fee. If the sender's money is refunded
minus the fee, they will be unhappy. And the merchant will be unhappy about
having had an unacceptable transaction they have to send back, and eat a
fee for the privilege.

This kind of situation needs to be avoided at all costs.
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