September 16, 2025
CoinOtag
CoinOtagAmerican Express Could Offer Ethereum-Based NFT Passport Stamps to Help U.S. Cardholders Commemorate Travel
Amex Passport NFT travel stamps are non-transferable ERC-721 tokens on Ethereum layer-2 Base that let eligible US American Express cardholders collect customizable, on‑chain keepsakes of countries visited. Each stamp records
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