Don't fully understood how it work ... is it like this? Alice want to send the token to Carol that it is with mint Bob . Alice cashu wallet sends the token via nostr to Carol nostr pubkey. Carol cashu wallet redim Alice token by accessing Carol nostr privatekey. Carol wallet can now sign token as its own. But at this point doesn't Carol wallet need to access directly to Bob mint using its mint address (ip clearnet or onion address)? Isn't the wallet that known his own nostr key?