Quote from: Saint-loup on September 17, 2023, 07:13:59 PM

Quote from: btc123thatthere on September 17, 2023, 05:25:14 AM

OpenDime, SatsCard and Cacascius; yes that's what I was looking for. Thanks

IMO you were talking about Tangem cards instead, AFAIK, they use to be the first ones to launch this kind of magnetic NFC cards. Other companies has offered similar products after them, but the first and the most known commercial brand is Tangem https://tangem.com
Why are you looking for this kind of product by the way? It's less safe than a hard wallet obviously, and if you want to use it in order to make an offline transaction by giving one funded card to someone, your recipient needs to know this technology and to trust it along with you.

Just interested in the novelty of being able to physically trade a valuable private key, that is locked say for 10 years or 100 years, that can be verified without needing an internet connection, that destroys itself if opened before the 10 to 100 year time has passed. I guess a list could exist to ensure that the used address did not exist anywhere else. But yes still some trust given to the manufacturer I suppose.