why I made this video: A lot of the videos and explanations I read about Bitcoin were vague and mystical sounding. Or, alternately, super long and rambling. This is my effort to explain it in as concise a manner as possible.<p>I'm relatively new to Bitcoin, so any critical feedback would be very much appreciated, especially regarding my explanations for the rationale behind the block chain, and potential security risks posed by large "mining pools."<p>After doing all my research, the craziest part to me is that the point of all the mining is just to sort transactions. If this is correct, then it seems like there's got to be a cheaper way to do this... maybe ripple's digital currency?