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Your idea is to implement a centralized blacklist whereby we would keep track 
of 'tainted coins.' This idea has been proposed in the past, and is in fact 
being made a commercial venture by the Coinvalidation folks. This is, in fact, 
a terrible idea for multiple reasons, but primarily because it would destroy 
the fungibility of bitcoins.

Here's some relevant reading material on the matter:

http://www.reddit.com/r/Bitcoin/comments/1qomqt/what_a_landmark_legal_case_from_mid1700s_scotland/

http://www.reddit.com/r/Bitcoin/comments/1qnqn1/a_pledge_i_invite_you_to_help_us_stop_the_threats/

- - Jameson

On 02/28/2014 02:32 PM, Stefan George wrote:
> Hello Bitcoin-enthusiasts,
> 
> I am new to this mailing list and would like to share/discuss an idea that
> crossed my mind today.
> 
> To lower the rate of thefts in the future there are 2 possible ways:
> 
>       1. Increase the security. E.g. use of multi sig wallets.
>       2. Decrease the value of thefts.
> 
> For 2. stolen BTC have to be identified and there has to be a penalty for
> them. 
> 
> There are two problems with it:
> 
> 1. Who has the responsibility to declare if a BTC is stolen or not and where
> is the information available?
> 2. BTC can spread over so many accounts easily and get new owners that it
> becomes very difficult to actually 
>      identify all stolen BTC and the penalty could affect people that didn't
> stole them.
> 
> The idea:
> 1. The big damage can be caused by hacking the biggest exchanges that hold
> most of the Bitcoins (Coinbase, Kraken etc.). 
> These exchanges should maintain and share a central database, where they
> mark BTC as stolen. 
> This database can be read by anyone but only big and legally trustworthy
> services (exchanges) maintain them.
> 
> 2. To lower the possibility to spread stolen BTC, clients can (optionally)
> check the database and refuse BTC that are listed here. 
> Of course the theft will try to spread the BTC right after the theft.
> Therefore it should be possible to REFUSE to receive Bitcoins 
> that have been involved in any transaction within the last 24h/48h (or just
> send them back). This way, if a big service detects a theft, it can act
> within 
> 24h/48h to submit this info into the central database and the theft could
> not benefit from the stolen coins anymore.
> 
> This is just an idea but it would be great to hear your thoughts!
> 
> Thanks,
> 
> Stefan
> 
> 
> ------------------------------------------------------------------------------
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------------------------------------------------------------------------------
Flow-based real-time traffic analytics software. Cisco certified tool.
Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
Customize your own dashboards, set traffic alerts and generate reports.
Network behavioral analysis & security monitoring. All-in-one tool.
http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
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