Delta Chat on Nostr: #deltachat user profiles are private and invisible to the public. No one can discover ...

#deltachat user profiles are private and invisible to the public. No one can discover you, or your children, via phone numbers or any other public handle. Chat profiles exist only on user devices. No PIN and no "SMS verification code" ever asked or needed.

The lack of "public discovery" also means you don't auto-discover others via phone numbers or other public handles. Getting in contact with others is "opt in": you scan a QR code or click an invite link to join a group or open a chat.