So I looked into this more. SwitchBot Lock looks to work with existing deadbolts (no need to change locks; good for renters), SwitchBot Keypad can be purchased either with or without fingerprint scanner, and the SwitchBot Card is 13.56 MHz ISO14443A.
Company claims: “Encrypted for even more security. Every SwitchBot Card uses finance level encryption methods to ensure the safe storage of passwords and prevent others from copying cards and using your password information.”
But I’m sure we can figure it out 
Says you can add more cards via their app, so we might be able to enroll implant rather than copying.
hmmm 
. I might be interested in trying it out.