Because the ported escrow system will be running on Substrate we don't necessarily have to have the distinction between the platform token (ETH on Ethereum) and the Human Protocol Token (HMT).
What this means is that we could have one unified token in the Substrate implementation that is used both for transaction fees as well as payments in the escrow system.
Default Approach
By default we will create a unified HMT token that is used for both the escrow system as well as paying transactions.