We use the NTAG424 chip from NXP, which is certified at EAL4+ and guarantees data retention for over 50 years.
Our recovery cards will soon be available separately for purchase on our website.
It’s not possible to build these cards using blank cards because they rely on a special authentication key preloaded during production.
Thanks for replying.
I think that regular credit card format is better option, as they can easily blend in and look like another credit/debit card.
Yes, of course we plan. We already finished implementation Tron and Solana, and on the way implementing TON. Full our list of implementation available here
I don't care about coins you mentioned, but I would appreciate to see optional Bitcoin-only firmware version, or maybe Bitcoin plus Monero (when it gets supported).