How can I do this at home?
Discussion
buy stamp.
put stamp on coin.
hit stamp with hammer.
😄
only vendor i found so far ( nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqyf8wumn8ghj7ur4wfcxcetsv9njuetnqqs03eyq7ja4xlavcx7m6qs0dhh6zdht650s27u4ldq9p039yncucyc7ssy99 ) but US>EU shipping is super expensive:
https://www.cryptocloaks.com/product/seedor-bitcoin-b-metal-stamp/