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Still boggles my mind: Toss a coin 256 times, noting if it's heads or tails, and convert the result into a binary number.

Congratulations, you've generated a Bitcoin private key, enabling you (after running it through a few more mathematical functions) to send and receive funds from anywhere in the world, with no central authority, no ties to your identity, no one to trust to keep your keys secure, and not even the requirement of an Internet connection. Just pure maths and cryptography...

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