It may be impossible, but I can imagine tampering with the Wizengamot proceedings. It is unimaginable that the Grand Manager of Gringotts should affix the seal of his office in witness to a false betrothal contract, and Miss Skeeter personally verified that seal
Gringott’s? I thought it was the security of the records of the Wizengamut that was thrown into question by what the twins did, not Gringott’s?
They managed to compromise both. From chapter 26:
Ah, whoops.