AmEx is considering the use of a blockchain as the prove of the payment
The American Express financial company (AmEx) filed a patent application with the US Patent and Trademark Office for a payment evidence system using the blockchain.
The application of the subsidiary American Express Travel Related Services describes the system for obtaining a "confirmation of payment, including the transaction amount and the trade identifier."
The document emphasizes the role of technology in preserving "transaction data, contract, payment documents, identification data and/or other information at will." At the same ...
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