U.S. Patent 10805090 was awarded to Blockstream Corporation on October 13, 2020 and is entitled “Address whitelisting using public/private keys and ring signature.” The first named inventor is Gregory Sanders of Greenbelt, MD. The abstract contains an overview of the patent disclosure:

Systems and methods are described for transferring and verifying the transfer of an asset from a limited-participant side chain back to a main blockchain. A public difference, associated with a secret difference, is determined as a difference between a main blockchain address and the public offline key of a transferring participant. The public difference is used, along with each participant public online key, to generate a ring signature key for each participant. A ring signature is then generated over the ring signature keys, based on the public online keys and a set of uniform random scalars (each associated with a participant public online key). The main blockchain address, a first coefficient from the ring signature, and the uniform random scalars are then published. When verified, the published ring signature shows that the transferring participant has control of the main blockchain address and the private offline key. Link to Full Patent

This blockchain patent was originally filed on March 23, 2018  as U.S. Patent Application 15/934847 at the United Stated Patent and Trademark Office. The application was them awarded a patent grant and published as U.S. Patent 10805090. The primary examiner was Gary S Gracia.

Blockstream Corporation, who is the original assignee of this patent, has at least 4 total granted patents in the United States as of the date of this article. This blockchain patent has been cited 0 times by other U.S. patents according to our law firm research, and can be considered an innovative patent in the field of cryptocurrency and blockchain.

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