Wormhole Cash (WHC) serves as the underlying currency within the Wormhole protocol. The reason for introducing WHC is as follows: when implementing smart contracts within the Wormhole protocol, the Wormhole protocol layer has no control over BitcoinCash, thereby precluding the ability to execute transactions within the Wormhole protocol layer. Additionally, when implementing smart contracts, the need for Gas to serve as a protective measure against network abuse arises, and the existence of a native underlying currency within the Wormhole protocol is also required.