Since 2007. At some point I became convinced there was a way to do this without any trust required at all and couldn't resist to
Since 2007. At some point I became convinced there was a way to do this without any trust required at all and couldn't resist to keep thinking about it. Much more of the work was designing than coding.
Fortunately, so far all the issues raised have been things I previously considered and planned for.
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source: bitcointalk