This ambiguity could result in guesswork when transferring funds as it is unclear whether the transfer should be denominated in bitcoin or litecoin. To prevent this, they suggested making the chain of the target link for each hop along the route explicit by adding a byte specifying the target realm, which should be protected under a MAC to ensure the payment's success. The byte could be stored in the per-hop payload along with the instructions for the hop, or the header may need to be extended by a byte.