Understand what Blockchain Oracles are, and the challenges that they face in the Oracle Problem. Understand why your smart contracts and blockchain platforms can’t themselves make API calls as part of their consensus. Then, understand how Chainlink solves each one of these.
Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments. Chainlink is critical to connecting the blockchain ecosystem to the rest of the world.
Oracles & the Oracle Problem:
More on Oracles: https://blog.chain.link/oracles-the-key-to-unlocking-smart-contracts/
The Oracle Problem: https://blog.chain.link/what-is-the-blockchain-oracle-problem/
Why can’t blockchain smart contracts make API calls: https://ethereum.stackexchange.com/questions/301/why-cant-contracts-make-api-calls
Learn more about Chainlink :
Discord: https://discordapp.com/invite/aSK4zew – Very active and developer focused!
Building DeFi Applications: https://defi.chain.link/