I’m not an expert in this field just exploring .
But I genuinely find your idea interesting, it’s like an encrypted signature system similar to blockchain, smart contracts, crypto, and NFTs.
The concept of providing a unique key to both the signer and the validator adds an extra layer of security and authenticity.
Currently, most digital signature services (that I use when partner with Company like Canva etc) only rely on drawing a signature, uploading an image, or typing a full name, it will be enough.
Your system, however, introduces an additional validation method through unique keys, which makes it stand out.
I hope you continue developing this idea. Don’t lose motivation, it has great potential. Maybe, in the future, integrating it with crypto technology could bring even more benefits or adding more features with more simple way, maybe.
It’s just my opinion, I just fonts designer. But from what I see, your system could be really useful in the long run. Consider my review as one of the users of that system.
Have a nice weekend.