What is Chainlink?

Full Article about Decentralized Oracle

Chainlink aims to build a fully decentralised network of oracle nodes compatible with Ethereum, Bitcoin and Hyperledger with modularity in mind: Every piece of the ChainLink system is upgradable. The main idea is to build a trusted marketplace for oracles where client and nodes are connected. Good behaviour is incentivised as performance and reputation is public, and bad behaviour will incur penalties. They are initially doing aggregation of data from oracles on-chain, but are looking to move it off-chain with an interesting design.

The security of any system is only as strong as its weakest link. Decentralisation is here to ensure availability at all times, but to counter the risk of faulty nodes delivering poor data, ChainLink puts forward two possible solutions.