Double-spend Attack

Double-spend Attack is a special badge that belongs into the Earth Badge tier. It's description is "Support Khan Academy with a Bit-coin donation, twice!"

Notable Users with this Badge

 * Desmond Brand

Learn how you can donate bitcoins to Khan Academy here.
If you don't know what a bitcoin is or want to learn more, head on over to the Khan Academy video tutorials and/or watch the simple one below!(but watching the tutorials are better because they give 750 energy points too!_



Related Badges

 * I am Satoshi Nakamoto