On August 3, 2017 Mastercard filed a patent application to the United States Patent and Trademark Office (USPTO) for the creation of refund services for digital currency.
The document describes a method of transferring information with verification from one party to another through suitably programmed computing apparatus. Information would be sent from one party's private address to the same party's public address. This information would then be sent from the public address to a second party's address. The information would be verified on a block of a blockchain. The first party's private address would not be communicated to the second party, only the first party's public address. The approach is suitable for crypto-currencies as it allows for an effective refund mechanism.