Despite the undisguised hostility towards cryptocurrency, MasterCard is actively working on the study of the distributed registry. This week Finance Corporation received from the Bureau of patents and trademarks USA (USPTO) several new patents related to blockchain technology. And one of them was quite unexpected.

The patent is called “Method and system for direct anonymous blockchain transactions”, the application for it was submitted by the company at the end of 2016.

According to this document, one of the obstacles to widespread adoption of blockchain may be the transparency of what is happening in this transaction, and inconvenient for businesses and individuals.

The example shows the situation when a person wants to buy a gift for a close so that the seller’s name remains unknown. Or when a business wishes to conceal from competitors the volume of their transactions and the names of the partners.

“Because of this, there is a need for a technical solution which will allow the facility to conduct transactions, details of which will be posted publicly, but anonymously. Thus, on the one hand will ensure control and reliability of these data and the other will not give third parties the opportunity to monitor the operation of the designated object. Thus for both parties involved in the transaction, will remain confidential”, says the patent application.

It should be noted that to achieve this level of anonymity, Mastercard is not going to use the existing “anonymous” coin such as Monero and zcash for.

Instead, the company’s patent proposes a system based on third-party servers that support the user database. Each profile individuals or legal entities contains identifying information and the number of secret data. After receiving information about a new transaction, the server generates two hash values. First, it creates the hash value with the operation details, and then appends the secret value from the profile of the sender. In the end, blockchain, or other distributed registry, it starts this second hash value. The integrity of the transaction will be confirmed and specific details of the transaction will remain anonymous.

Recall that earlier this month, the company also has patented technology to verify the card when making a purchase on the public blockchain, and tourist blockchain system.

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