@LynAlden Reading Broken Money atm, really enjoyed it so far. I am however having problems with a part on mining on page 305. "...A miner (or pool of miners) that successfully solves the puzzle left by the prior block can look through their pending transaction queue and pick ones to add to the new block that they create...". The phrasing makes it sounds like you first solve the puzzle, then you pick the transactions to include in the block?