System, method, and computer program product for secured, encrypted transaction processing

A system comprising at least one transaction processing server including at least one processor, the at least one transaction processing server programmed or configured to:

• receive a transaction request initiated by at least one of a first computing device associated with a first user and a second computing device associated with a second user, the transaction request comprising:
• a first user token comprising a first token identifier and a first account balance, the first account balance encrypted with a public key of a public/private key pair associated with the first user;
• a second user token comprising a second token identifier and a second account balance, the second account balance encrypted with a public key of a public/private key pair associated with the second user;
• and
• a transaction value;
• in response to receiving the transaction request, verify the transaction request;
• and
• in response to verifying the transaction request:
• generate a new first account balance by executing a zero-knowledge subtraction of the transaction value from the first account balance;
• generate a new first user token comprising the new first account balance, the new first account balance encrypted with the public key of the public/private key pair associated with the first user;
• digitally sign the new first user token;
• transmit the new first user token to the first computing device for storage on the first computing device as a current first user token of the first user and for use in future transactions by the first user;
• generate a new second account balance by executing a zero-knowledge addition of the transaction value to the second account balance;
• generate a new second user token comprising the new second account balance, the new second account balance encrypted with the public key of the public/private key pair associated with the second user;
• digitally sign the new second user token;
• and
• transmit the new second user token to the second computing device for storage on the second computing device as a current second user token of the second user and for use in future transactions by the second user.

A computer program product comprising at least one non-transitory computer-readable medium including program instructions that, when executed by at least one processor, cause the at least one processor to:

• receive a transaction request initiated by at least one of a first computing device associated with a first user and a second computing device associated with a second user, the transaction request comprising:
• a first user token comprising a first token identifier and a first account balance, the first account balance encrypted with a public key of a public/private key pair associated with the first user;
• a second user token comprising a second token identifier and a second account balance, the second account balance encrypted with a public key of a public/private key pair associated with the second user;
• and
• a transaction value;
• in response to receiving the transaction request, verify the transaction request;
• and
• in response to verifying the transaction request:
• generate a new first account balance by executing a zero-knowledge subtraction of the transaction value from the first account balance;
• generate a new first user token comprising the new first account balance, the new first account balance encrypted with the public key of the public/private key pair associated with the first user;
• digitally sign the new first user token;
• transmit the new first user token to the first computing device for storage on the first computing device as a current first user token of the first user and for use in future transactions by the first user;
• generate a new second account balance by executing a zero-knowledge addition of the transaction value to the second account balance;
• generate a new second user token comprising the new second account balance, the new second account balance encrypted with the public key of the public/private key pair associated with the second user;
• digitally sign the new second user token;
• and
• transmit the new second user token to the second computing device for storage on the second computing device as a current second user token of the second user and for use in future transactions by the second user.