Just as we are plagued by data breaches because of our reliance on secrecy as our model of trust assertion instead of just-in-time information verification, we are similarly plagued by scams related to our inability to verify unknown contacts. Calls, text messages, emails, etc from unknown sources are now a major source of scams, cyber extortion and such. As was demonstrated here , Certisfy stickers backed by cryptographic certificate signatures can address this type of trust problem too. If for instance your doctor's office or other place of business that you have a legitimate business relationship with calls you, they can simply begin the message with a sticker code such as below. You can put that sticker code in the Certisfy app and verify the identity and related information, including for the contact source identifier (phone number, email address...etc). If a message doesn't start with a verifiable sticker code, you drop it immediately, this effectively kills all such s