[Bitcoin-development] 0 confirmation txs using replace-by-fee and game theory

[Jannis Froese]

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On 24.04.2014 14:15, Mike Hearn wrote:
> Beyond needing to double balances, what if the shop is selling me a
> phone on contract? So the actual cost of the phone is lower than
> the real price on the assumption of future revenue. Alice double
> spends (aka steals) the phone, paying double the artifically lower
> cost but still making a good saving. Bob does not end up with
> "nothing", he ends up in the red.

Nearly every payment system in existence has this problem: you have to
be able to enforce the contract out-of-band. The scenario you describe
is no worse than a payment network with instant, secure confirmations
because Alice could just as well refuse to make the second payment.
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