– Reuters Citing Tweet
Amazon Granted U.S. Patent Titled ‘Decentralized cryptographic key derivation’
https://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=1510&f=G&l=50&d=PTXT&p=31&S1=20210914&OS=20210914&RS=20210914