Encode Club

1. Smart Contract
Developer Bootcamp
Introduction to Blockchain,
Smart Contracts, and
Chainlink

2. Andrej Rakic
Developer Advocate, Chainlink Labs
@andrej_dev

3. Chainlink Data Feeds
● Powering over $76 billion
in the DeFi world

4. How to get prices securely in Web 3
● Don’t ever use low liquidity tokens
● Use Chainlink
● TWAPs are subject to pretty easy manipulation
● A DEX IS A CENTRALIZED PRICE ORACLE

5. Chainlink Data Feeds
● Full market coverage (DEX & CEX’s)
● Mix of premium data providers/aggregators, and
exchanges
● Use volume based average method of aggregating data
● Feeds live on multiple blockchains
● Most feeds now upgraded to use OCR

6. Reaching Consensus

7. Off-Chain Reporting (OCR)
● Each node reports over p2p
● Each nodes sign data
● Single node submits
● Full data all available on-chain
● Aggregation still done on-chain
● Reduces gas costs by up to 90%

8. Exercise: My First Price Feed Consumer
● Remix: http://remix.ethereum.org/
● 20 minutes

9. Solidity and Smart Contract Starter Kits

10. Where Can I Learn More

14. Learn more!
Discord Chat
http://chn.lk/chainlink-discord
Documentation:
http://docs.chain.link
Starter Kits
https://github.com/smartcontractkit
Hackathon Resources
http://chn.lk/hack-resources