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Date: Sat, 27 Sep 2014 19:55:44 -0700
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Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] SPV clients and relaying double spends
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On 9/25/2014 7:37 PM, Aaron Voisine wrote:
> Of course you wouldn't want nodes to propagate alerts without
> independently verifying them
How would a node independently verify a double-spend alert, other than 
by having access to an actual signed double-spend?

#4570 relays the first double-spend AS an alert.  Running this branch on 
mainnet, I have been keeping a live list of relayed double-spend 
transactions at http://respends.thinlink.com