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PANews 9月16日消息，据Cointelegraph报道，支付公司美国运通（American Express）为客户推出了基于区块链的旅行纪念邮戳，作为其旅行经历的数字化纪念品。据该公司网站介绍，每枚旅行邮戳将以ERC-721 ...

American Express has rolled out NFT passport stamps for its travel-loving customer base, which will be stored on the Ethereum layer-2 blockchain Base.