When you’ve successfully mined a pow32, can you reassociate your profile to the new pow32, or is the pub/private key pair itself your identity? (So i would just start over with the new private key?) 

 I don’t know enough about the method, but is there a chance a duplicate key could be generated and used by someone else while you’re holding onto it?  Seems astronomically unlikely but something I’ve wondered. 

 What about pow32 bech keys?  npub00000000 ?  :)