Quote from: btc123thatthere on September 07, 2023, 10:42:47 AM

A year or three ago I came across various devices that had a private key inside them, holding a certain amount of bitcoin.
I think they ran off external electro-magnetically induced power (like a credit card) to power its chip, which could prove ownership of its key to an external device that had a new-enough copy of the blockchain for verification.

I think you should be talking about Casascius if am right about your guess then here are some vital threads already discussed about this physical bitcoin on the forum

https://bitcointalk.org/index.php?topic=51964.0
https://bitcointalk.org/index.php?topic=39306.0
https://bitcointalk.org/index.php?topic=52537.0

You can make more research on that if i just made the right guess, casascius is a physical bitcoin and all you could needed to use in claiming this bitcoin token wrapped is in the definition of what casascius is and how to redeem it.