Hi!
I think it may be more robust to issues to use the inscription_id instead of the inscription_number as the "key reference" for orc-721.
Reason:
- Inscription number could shift since it is a manually constructed ID depending on what is included/excluded from the ordinalds standard.
- InscriptionID will not change and is unique to each inscription
(this is for num/*.png specifically but may be a good standard to use across the project)