Chainlink and interfaces

The way blockchains are set up now, they do not have a way to take real world data and implement that into a blockchain. So how do we do this?

Well, it would seem that we need a way to collect data and then take that data and use it on the blockchain.

BUT! If we use a single source to gather data, then we have a centralized point for collecting data and all the hard work of making a blockchain becomes pointless.

Enter, chainlink. Chainlink allows a decentralized way to collect information, and then have that information be available on blockchains. Chainlink provides developers with interfaces that smart contracts can then implement to get information.

I like to think of this as making an api call, but instead of the api call coming for a centralized point, it is coming from many different nodes.

Many companies are currently using chainlink, such as Aave and SushiSwap as a way to insure that they are getting the correct prices for things such as ETH.

Using a chainlink interface is quite simple.

If I add this code to my sol file…

I now have access to every method that is inside of this interface. In order to see what is in this interface, just simply google npm chainlink/contracts, click the link to github and follow the path to the file.

If you use the one above, you will discover that this is a price feed. Now once you can deploy your contract, and write functions that will be able to interact with this chainlink contract. It’s a contract inside of a contract, interacting with another contract.

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