[macspoofing]

>A nominal payment for the purpose of verification could allow someone to "prove" ownership of a number/email/identity.

1) Not really .. people can steal your private key. And then you have to same problem.

2) Don't payment processor already have inordinate amount of (government-issued) identity data they collect from you? Everything from Driver's license, to Passport, to Social Insurance numbers? How would another piece of information make any difference?