Bitcoin - Proof of work

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: www.khanacademy.org/economics-finance-domain/core-… An explanation of cryptographic proof-of-work protocols, which are used in various cryptographic applications and in bitcoin mining. More free lessons at: www.khanacademy.org/video?v=9V1bipPkCTU 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.