Bitcoin – The security of transaction block chains


A detailed explanation of what makes bitcoin transaction block chains secure.
More free lessons at: http://www.khanacademy.org/video?v=8zgvzmKZ5vo

Video by Zulfikar Ramzan. Zulfikar Ramzan is a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire. He received his Ph.D. in computer science from MIT

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