BTC Approximation (BETI) - Bitcoin Exponential Trend
//based on
//https://www.wolframalpha.com/input/?i=e+%5E+(+0.00331836433279664++(+number+of+seconds+since+jul+17,+2010+12pm+UTC%2F86400%2Fseconds+)+-0.120774828196607+)
//https://bitcointalk.org/index.php?topic=470453.680
//https://www.wolframalpha.com/input/?i=e+%5E+(+0.00331836433279664++(+number+of+seconds+since+jul+17,+2010+12pm+UTC%2F86400%2Fseconds+)+-0.120774828196607+)
//https://bitcointalk.org/index.php?topic=470453.680