Bitcoin Protocol Paper Playlist: http://www.youtube.com/watch?v=UieiMU-ImvI&list=PLQVvvaa0QuDcq2QME4pfeh0cE71mkb_qz&feature=share
All Bitcoin Videos Playlist: http://www.youtube.com/watch?v=UieiMU-ImvI&feature=share&list=PLQVvvaa0QuDebbCxrDPCux6SzC1RET4mF
In this Bitcoin protocol tutorial video, the notion of Proof of Work is discussed. The idea of proof of work, normally, is to protect against spam and DoS attacks. With bitcoin, however, it is used to secure the blockchain, requiring that someone must re-do large amounts of computer processing to fake things in the blockchain.
In the next video, you will be shown, via raw code, how Proof of Work actually works. This should help clear any confusion if you are confused at that point.
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