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From: Gregory Maxwell <gmaxwell@gmail.com>
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Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Malleability and MtGox's announcement
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On Mon, Feb 10, 2014 at 12:47 PM, Tier Nolan <tier.nolan@gmail.com> wrote:
> If the attacker has a direct connection to MtGox, they can receive the
> transaction directly.
MtGox had a php script that returned base64 data for all their stalled
transactions.

Not just attackers used that, some people trying to unstick their
transactions tried manually fixing them with honest intent and no idea
it would potentially confuse mtgox's software.