Rue Montorgueil, Paris, 847097

I'm trying the Satscard from @Coinkite (old npup) 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 @nunchuk_io (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

Saint-Germain-des-Prés, Paris, 841399