Mastercard has patent which could enable blockchain currency credit cards

Mastercard has a patent managing fractional reserves of blockchain currency.

The Mastercard patent deals with:

* storing, in a first central account, a fiat amount associated with a fiat currency;
* storing, in a second central account, a blockchain amount associated with a blockchain currency;
* storing a plurality of account profiles, each profile including a fiat currency amount, blockchain currency amount, account identifier, and address;
* receiving a transaction message associated with a payment transaction, the message being formatted based on one or more standards and including a plurality of data elements, including a data element reserved for private use including a specific address and a transaction amount;
* identifying a specific account profile that includes the specific address included in the data element in the received transaction message; and
* updating the blockchain currency amount included in the identified specific account profile based on the transaction amount included in the data element in the received transaction message.

A system for managing fractional reserves of blockchain currency includes a central database, an account database, a receiving device, and a processing device. The central database is configured to store: a first central account including at least a fiat amount associated with a fiat currency; and a second central account including at least a blockchain amount associated with a blockchain currency. The account database is configured to store a plurality of account profiles, wherein each account profile includes data associated with a consumer including at least a fiat currency amount, a blockchain currency amount, an account identifier, and an address. The receiving device is configured to receive a transaction message associated with a payment transaction, wherein the transaction message is formatted based on one or more standards and includes a plurality of data elements, including at least a data element reserved for private use including a specific address and a transaction amount. The processing device is configured to: identify a specific account profile stored in the account database where the included address corresponds to the specific address included in the data element in the received transaction message; and update the blockchain currency amount included in the identified specific account profile based on the transaction amount included in the data element in the received transaction message.