Hi ZmnSCPxj & Raymo,

> On Jun 28, 2021, at 8:28 AM, ZmnSCPxj via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
> 
> Good morning Raymo,
> 
>> Hi ZmnSCPxj,
>> […]
> What prevents the creditor from signing a transaction that is neither a valid MT nor a GT?
> 
> Nothing.

How would the creditor create such a transaction? They need the issuer’s private key, so they can’t create it? Am I misunderstanding the scenario you’re describing? If so could you give a more detailed description?

Cheers,
Greg