Double spend detection is by definition best-effort.

The purpose of bitcoin is to provide security (confirmations) to otherwise
insecure, possibly double spent transactions.




On Fri, Jun 19, 2015 at 2:05 PM, Frank Flores <frank...@gmail.com> wrote:

> Has anyone from Mycelium weighed in on this? Is their doublespend attack
> detection broken with this kind of irresponsible behavior?
>
> On Fri, Jun 19, 2015 at 3:39 PM, Matt Whitlock <b...@mattwhitlock.name>
> wrote:
>
>> On Friday, 19 June 2015, at 9:18 am, Adrian Macneil wrote:
>> > If full-RBF sees any significant adoption by miners, then it will
>> actively
>> > harm bitcoin adoption by reducing or removing the ability for online or
>> POS
>> > merchants to accept bitcoin payments at all.
>>
>> Retail POS merchants probably should not be accepting vanilla Bitcoin
>> payments, as Bitcoin alone does not (and cannot) guarantee the
>> irreversibility of a transaction until it has been buried several blocks
>> deep in the chain. Retail merchants should be requiring a co-signature from
>> a mutually trusted co-signer that vows never to sign a double-spend. The
>> reason we don't yet see such technology permeating the ecosystem is
>> because, to date, zero-conf transactions have been irreversible "enough,"
>> but this has only been a happy accident; it was never promised, and it
>> should not be relied upon.
>>
>>
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>
>
>
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-- 
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/
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