I'm trying the Satscard from nostr:npub1wu4aye7ll0lnrrg638e90sehzsgpzx5t39t3mwl05aa0d0ap08esdz3vw0 for the first time, and I have to say that it's an amazing product. The workflow is simple and flawless so far, it's a shame that no wallet out of nostr:npub1cvqlzvmjercdn0ypsmv8f7j9lge6ahsnueh5rparh53wuswftv4q49yjt3 (and Sparrow) supports it.

3 questions from those of you who may know, or if Coinkite or Nunchuk see this:

- is the code allowing the Satscard open source, meaning that if I was a dev I could create my own Satscard by buying a basic NFC card and using the available code to transform it into a workable Satscard ?

- if Coinkite disappear, do all the Satscard suddenly become useless ?

- I understand that depositing funds on an unsealed slot address is not safe because a previous bearer could still own the private key of the slot.

But what if I send funds on an old unsealed slot address by mistake ? Can I still easily spend the funds through the Nunchuk app ?

Thanks