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American Express Files Patent for Blockchain-Powered Proof-of-Payment System Financial services giant American Express (Amex) has filed a patent for a blockchain-based proof-of-payment system, according to filing published by the U.S. Patent and Trademark Office (USPTO) […]
bitcoin_nocashday-52By CashlessWay – Global Hub for ePayment Culture on 2014-06-28 09:38:56[wpr5_ebay kw=”bitcoin” num=”1″ ebcat=”” cid=”5338043562″ lang=”en-US” country=”0″ sort=”bestmatch”]