[Bitcoin-development] Instant / contactless payments

[Mike Hearn]

>
> If there was a way for a Bitcoin user to provide feedback on a payment
> (ECDSA signature from one of the addresses involved in the payment, signing
> an identifier of the payment and a feedback score)
>

Well now you're getting into the area that I said "rapidly got very
complicated".

Define bitcoin user? What stops me paying myself to accrue positive
reputation? Etc.
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