External transactions, which will now be referred to as a ETx(s), are transactions that modify state across Quai Network blockchains. An example of an ETx is a Tx that sends QUAI from Region 0 Zone 0 to Region 1 Zone 3. This ETx will need to be recorded via the UTXO connector in Region 0, Prime, and Region 1 before ultimately modifying state in Zone 3. ETxs are separated by address state. Quai utilizes separated address spaces dictated by the first two bytes of an address to split the originating location of where funds can be sent from.