Adding custom skull nbt

I am trying to get custom skulls into the game because HeadDB is outdated.
I would like to know what the NBT format looks like, so i can implement my own base64 data and get the skulls i want. This also allows me to eventually implement my own base64 data.

Take for example this(outdated) item data for a custom skull from 1.20.4
image.png
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