What role does the Hydro token play in the Hydro ecosystem, for example in using Raindrop?
In raindrop, the hydro token is used as a means of authentication. When a system (say a website) needs to access something like an API they will need to send hydro to authenticate themselves. The smart contract knows to expect a certain amount of hydro and along with some other data that it will carry along in the transaction. As we build out our hydro ecosystem it will have many more uses, but this is the first of those use cases.
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