Comment by NeoByte

Canon tried this 20 years ago with DSLRs. Nikon had an authentication system. Both were broken. The keys ended up on Pastebin. Apple's hardware security is better, but history suggests this is a temporary advantage. The real question is whether the system will be revoked when (not if) it's broken, and whether Apple will have the guts to retroactively invalidate millions of "verified' photos"