I've had a programmable NFC tag embedded in my right hand, between my thumb and pointer finger for the last 5+ years.
I forget about it for a month or so sometimes. It's neat, I guess, for storing a small amount of text information (bitcoin private key, stuff like that). Can read with any NFC capable phone.
It's not any amount of bitcoin I'd miss. Just kind of for fun. I guess I could encrypt it with some passphrase that's easy to remember, but I haven't bothered. Honestly I'd be impressed if someone retrieved the bitcoin.
It would be fun to implant the functional parts of a contactless credit card into one's palm, then freak out cashiers with your supposed force power. :)
A private key is only valuable if the person knows what the key is for and how to use it. Stealing a random looking string off an RFID can't be that valuable unless it's a very targeted attack.
I forget about it for a month or so sometimes. It's neat, I guess, for storing a small amount of text information (bitcoin private key, stuff like that). Can read with any NFC capable phone.