Unprovable:

1) Spam versus not spam.

2) That a private key is actually kept secret.

3) Digital binding to a person.

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Discussion

3) is WoT based.

Not probable in the absolute sense, but to a high enough degree of confidence that would make it indistinguishable from a proof?

2. You can chose a string of 256 bits yourself. If you do that you can be sure its private.

"kept secret"

Ahh you can be sure it isnt 😅

1. the receiver (so you!) decide what is spam for you. Not hard.

2. 3. can't be certain but there are degrees of confidence

2 and 3 are logical. But I believe we need digital bindings to actually work. Nostr keys instead of national IDs. 😵‍💫