Five on Nostr: If it is a regular token you received then you go to the mint and immediately swap ...
If it is a regular token you received then you go to the mint and immediately swap those tokens to have your own proofs that nobody else has. Until that time it is still double-spendable.
BUT if you have minted a P2PK token tied a specific pubkey then it can only be spent by unlocking that token with a signature just like in bitcoin p2pk.
These are also be swapped sometimes though upon receiving, depending on user needs: e.g. I want different coin denominations so I consolidate some tokens, or I want to have them in my own mint, in this case I melt them and deposit in my other more trusted mint.
BUT if you have minted a P2PK token tied a specific pubkey then it can only be spent by unlocking that token with a signature just like in bitcoin p2pk.
These are also be swapped sometimes though upon receiving, depending on user needs: e.g. I want different coin denominations so I consolidate some tokens, or I want to have them in my own mint, in this case I melt them and deposit in my other more trusted mint.