Mike Caldwell – Physical Bitcoins

Mike Caldwell is the creator of Casascius Bitcoins, the first and most widely-known series of physical stored-value coins that hold real Bitcoins inside.  He also has free software that can be used to create a 2-factor Bitcoin key (This is where 2 keys are needed to unlock the bitcoins from it’s wallet).

[youtube]http://www.youtube.com/watch?v=kDyD-cmSD50[/youtube]

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