I recently noticed a gambling website (
www.bitcoinbetting.website) is offering 4 times return on correctly guessing the last digit of a block hash. I would like to know, how random is the last digit of a block hash really is? Is there any bias towards numbers or letters?
It's a digit in hex format between 0 - F so in decimal between 0-15.
Your chance to guess the right digit is 1 in 16.