An electronic transaction verification system comprising a client subsystem, a merchant subsystem, and a transaction verification subsystem. The transaction verification subsystem receives a quantum payment serial number from the client subsystem and performs entangled quantum encryption on the received quantum payment serial number to generate an entangled quantum payment serial number. The verification subsystem encrypts the entangled quantum payment serial number and transmits the encrypted entangled quantum payment serial number to the merchant subsystem. The transaction verification subsystem also transmits the entangled quantum payment serial number to the client subsystem.