Empowering Smart Contracts with Decentralized Data
summary
Demonstrates using Chainlink oracles to pull real‑world data into smart contracts: deploys a PriceConsumer on Kovan to read price feeds (example returns show ETH ≈ $1,560 after scaling), requests provable randomness via VRF (callback returns a large cryptographic random number), and makes HTTP API calls with job IDs and external adapters, funding requests with LINK (example fee 0.1 LINK). Cites the need for decentralization after multiple centralized‑oracle DeFi attacks (five $1M+ incidents, ~$30M total).
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chapters (13)
- 0:00Welcome
- 1:04Smart contracts need decentralized data
- 2:48Oracle problem and Chainlink’s solution
- 5:54Chainlink as decentralized oracle network
- 7:19Pre-built price feeds
- 11:03Provably random numbers with Chainlink VRF
- 13:09API calls with Chainlink and adapters
- 14:11Real-world Chainlink use cases
- 15:13Chainlink docs and resources
- 16:36Demo: Fetching price feeds
- 21:08Demo: Random numbers with Chainlink VRF
- 27:45Demo: HTTP GET with Chainlink
- 30:11Closing and hackathon
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