What happened
Single insufficiently protected key enabled unauthorized minting at scale.
Transaction-level mechanics
Public post-incident disclosures do not include full transaction calldata or execution traces for this incident.
TODO: Add exact Safe transaction hash, decoded actions, and the on-chain state changes once verified primary sources are available. For now, the attack vector summary above is derived from public reporting.
What independent decoding / hash verification / config scanning would have caught
Not a signing-review failure, but a Safe-Inspector-style config scan would flag single-key control over minting (equivalent of a threshold-1 finding) before the hack, if anyone ran it.
Verdict
Could have helped partially