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Can you use them to send them to snail mail or do you just collect and trade them?

It looks like there is a physical stamp you can use with these too. Once I get mine and I acn get on the trading part, I will see if there is a difference in price between used and unused NFT stamps.

Cool. You can send me a postcard with an NFT stamp😀

I will see if it is domestic or international post. Lol