Date: Thu, 5 Jan 2017 15:48:33 +0100
From: Christian Decker <decker.christian@gmail.com>
To: bitcoin-dev@lists.linuxfoundation.org
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Subject: Re: [bitcoin-dev] Committed bloom filters for improved wallet
 performance and SPV security
Precedence: list

On Wed, Jan 04, 2017 at 11:45:18PM -0800, Eric Voskuil via bitcoin-dev wrote:
> On 01/04/2017 11:06 PM, Chris Priest via bitcoin-dev wrote:
> > The best way is to connect to the mempool of each miner and check to
> > see if they have your txid in their mempool.
> > 
> > https://www.antpool.com/api/is_in_mempool?txid=334847bb...
> > https://www.f2pool.com/api/is_in_mempool?txid=334847bb...
> > https://bw.com/api/is_in_mempool?txid=334847bb...
> > https://bitfury.com/api/is_in_mempool?txid=334847bb...
> > https://btcc.com/api/is_in_mempool?txid=334847bb...
> > 
> > If each of these services return "True", and you know those services
> > so not engage in RBF, then you can assume with great confidence that
> > your transaction will be in the next block, or in a block very soon.
> > If any one of those services return "False", then you must assume that
> > it is possible that there is a double spend floating around, and that
> > you should wait to see if that tx gets confirmed. The problem is that
> > not every pool runs such a service to check the contents of their
> > mempool...
> > 
> > This is an example of mining centralization increasing the security of
> > zero confirm.
> 
> A world connected up to a few web services to determine payment validity
> is an example of a bitcoin security catastrophe.
> 
> e
> 

And it's a great way to tell every miner who you are and what
transactions you are sending/receiving. An absolute privacy
nightmare...

-- cdecker