Fun nut fact #2

For nuts that start with cashuB, the rest of the string (everything after cashuB) is CBOR encoded. You can use CBOR to JSON Online Converter and paste it into the left side, and it will show you the (more) human-readable JSON data on the right.

As can be seen below, the data in your nut starts with the mint URL. So changing the left-most part will corrupt that.

You'd think that the later sections would be important, too, since they contain key ids and secrets. But at the very end your nut contains DLEQ proofs, which are not needed to melt tokens.