like I said, whether its actively being censored by miners or not doesn't make it fungible or not.
its whether you CAN differentiate between units or not that makes it fungible.
so according to your example, those bills are not fungibile.
like a cop drama with the invisible ink that marks the stolen money or whatever. those bills lose their fungible quality.
*it doesn't matter whether the counterparty accepts them or not*
they can be identified as different than another bill of the same denomination.
therefore not fungibile.
unfortunately ALL Bitcoin utxos have tracked serial numbers.
