Seems like a nice idea.


On 24 June 2014 14:27, Mike Hearn <mike@plan99.net> wrote:

> Coinbase have started allowing merchants to set discounts for purchasing
> with Bitcoin. Seeing an individual discount is not very motivating as they
> tend to be small. Seeing them stack up over time can be more motivating
> because it feels like free money. Many businesses exploit this effect with
> loyalty points, etc. Bitcoin should do this too - show the user how much
> they're saving by using Bitcoin instead of credit cards.
>
> I suggested to Charlie Lee (who pushed this through at Coinbase) and
> Stephen Pair the following minor BIP 70 extension:
>
>
> message PaymentDetails {
>     // Size in satoshis of any discount provided by the merchant ONLY
>     // because the user chose to pay using Bitcoin or other similar
>     // digital currency. Other kinds of discounts, loyalty bonuses and
>     // so on should not be recorded here, rather they could be mentioned
>     // in the memo field. This field exists so wallets can show the user
>     // a running total of how much money they have saved by avoiding
>     // credit cards and bank payments; the goal is to encourage people to
>     // use Bitcoin. Putting other kinds of discounts here would make the
>     // running total calculated meaningless; so don't do it!
>     optional uint64 currency_usage_discount_size = 8;
> }
>
> Wallets would then be able to persist this data to disk and compete on
> cool visualisations for how much money you saved over time.
>
> We haven't formalised how to extend BIP 70 yet, that's my fault. We should
> do that. In the meantime, what do people think of this proposal?
>
>
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