IBM topped the 2019 list of U.S. patent recipients for a record 27th consecutive year. Additionally, it was granted the most blockchain patents. The surprise is that blockchain did not appear on the top ten list of growth categories at the U.S. patent office, according to a report from IFI Claims. IBM said its grants included several patents related to blockchain network security. It described one of the applications as “resisting ‘replay attacks’, where an attacker copies and uses signature information from one transaction on a blockchain to later perform other transactions on the blockchain that are not authorized.”
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