In 2011, San Francisco-based Stefan Thomas uploaded an animated video to YouTube titled 'What Is Bitcoin' for a Bitcoin enthusiast in Switzerland.

He was paid 7,002 Bitcoins for making the short one-minute clip.

Today, with the value of Bitcoins having sky-rocketed, his collection now would be worth a staggering $350 million.

Now he has just two tries left; if he fails to do so, the drive will be locked forever.

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