I like usb stack feeling of using and old usb from back the day, but also it could a cheaper alternative to hardware wallet if you know what I mean. No manufacturer wallet app/sofware interface that an upgrade every month, just a pub key and a priv key, you can fund as much as you like but withdrawing means a wallet distroy(technicaly)

piecover

bitcoin

Would You Use Opendime More To Transfer Bitcoin Ownership(UTXO) if They Were $5?

Bought some as souvenirs of the journey but don't plan to use them. I like them but can't see explaining them over and above Bitcoin itself. They should make collector's versions.