In this workshop, Developer Advocate Patrick Collins gives a step-by-step walkthrough to setting up your development environment and deploying your first smart contract on Ethereum.

Discover what smart contracts are, how to write them, and why decentralized oracles are essential to smart contract development. You'll learn how to use Chainlink's data feeds in your smart contracts so you can deploy contracts with reliable, tamper-proof inputs. Get everything you need to know to start building with Chainlink, just in time for the 2021 Chainlink Hackathon.

Beginners tutorial: https://docs.chain.link/docs/beginners-tutorial
Chainlink Hackathon Spring 2021: https://chain.link/hackathon

-------Updates-------
None, happy coding!

Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments.

Learn more about Chainlink:
Website: https://chain.link
Twitter: https://twitter.com/chainlink
Newsletter: https://chn.lk/newsletter
Telegram: https://t.me/chainlinkofficial

If you’re a developer, visit the developer documentation https://docs.chain.link or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew

Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments.

Documentation from this video: https://docs.chain.link/docs/get-a-random-number.

Updates:
None, Happy coding!

Chainlink VRF is a tool that allows engineers to finally get truly random and provably random numbers on-chain, opening the doors for a flood of new projects.

Resources:
Kovan ETH Faucet: https://app.mycrypto.com/faucet
Kovan LINK faucet: https://kovan.chain.link/
Kovan LINK address: 0xa36085F69e2889c224210F603D836748e7dC0088

Learn more about Chainlink
Website https://chain.link
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

Visit the developer documentation https://docs.chain.link or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew
Learn more about Chainlink
Website https://chain.link
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

Ethereum is a decentralized platform where engineers can create smart contracts - which are decentralized programs that automatically execute, without the need for a centralized intermediary.

Chainlink is a decentralized oracle network that enables smart contracts to securely connect with any data and system outside the blockchain such as data providers, web APIs, IoT networks, other blockchains, enterprise backends, traditional bank payments, and more. Chainlink is critical to connecting the Ethereum ecosystem to the rest of the world.

More about Ethereum
Ethereum 101: https://www.coindesk.com/learn/ethereum-101/what-is-ethereum
Ethereum mining: https://cointelegraph.com/ethereum-for-beginners/how-to-mine-ethereum-guide-for-beginners
Blockchain demo, and cryptography “magic”: https://andersbrownworth.com/blockchain/

Learn more about Chainlink
Website https://chain.link
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

If you’re a developer, visit the developer documentation https://docs.chain.link or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew

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 :
Documentation: https://docs.chain.link/docs/getting-started
Discord: https://discordapp.com/invite/aSK4zew - Very active and developer focused!
Website https://chain.link
Building DeFi Applications: https://defi.chain.link/
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments.

Learn more about Chainlink
Website https://chain.link
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

If you’re a developer, visit the developer documentation https://docs.chain.link or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew

Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments.

Learn more about Chainlink
Website https://chain.link
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

If you’re a developer, visit the developer documentation https://docs.chain.link or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew

Truffle Boilerplate: https://github.com/smartcontractkit/box
Brownie Boilerplate: https://github.com/smartcontractkit/chainlink-mix
Hardhat Boilerplate: https://github.com/smartcontractkit/chainlink-hardhat-box

Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments.

Learn more about Chainlink
Website https://chain.link​
Twitter https://twitter.com/chainlink​
Telegram https://t.me/chainlinkofficial​

If you’re a developer, visit the developer documentation https://docs.chain.link​ or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew

Chainlink is a decentralized oracle network that enables smart contracts to securely access off-chain data feeds, web APIs, and traditional bank payments.

Learn more about Chainlink
Website https://chain.link
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

If you’re a developer, visit the developer documentation https://docs.chain.link or join the technical discussion on Discord https://discordapp.com/invite/aSK4zew

Chainlink is an infrastructure designed to be unlimited in how customizable it can be. External adapters are open sourced packages that allows Chainlink nodes to transform and receive data however they like. With external adapters you can do:
1. API Authentication (keep private API password keys private)
2. Private, low latency, and/or high throughput off-chain computation to save gas.
3. Write data to other blockchains (interoperability).
4. Any desired functionality that isn’t covered with the core adapters
This allows your solidity smart contracts to have access to data that they never would have before.

This video goes over:
1. What an external adapter is
2. How to build one
3. Who should host it
4. How to use one

Blog post: https://blog.chain.link/build-and-use-external-adapters/

-----Updates-----
None, Happy Coding!

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.

Code setup:
Install Yarn: https://classic.yarnpkg.com/en/docs/install/
Install nodejs: https://nodejs.org/en/download/
Nodejs External Adapter Template: https://github.com/PatrickAlphaC/CL-EA-NodeJS-Template
Nodejs External Adapter Template with the completed weather API code: https://github.com/PatrickAlphaC/openweathermap_cl_ea
External adapter documentation: https://docs.chain.link/docs/external-adapters
Learn more about Environment Variables: https://www.twilio.com/blog/2017/01/how-to-set-environment-variables.html

Remix (kovan) from ending:
https://remix.ethereum.org/#version=soljson-v0.6.6+commit.6c089d02.js&optimize=false&gist=f856530b20943e92ed6cc69c1285cdfe&evmVersion=null

Important Commands/APIs:
curl -X POST -H "content-type:application/json" "http://localhost:8080/" --data '{ "id": 0, "data": { "from": "ETH", "to": "USD" } }'

API:
https://min-api.cryptocompare.com/data/price?fsym=ETH&tsyms=USD

Node Listing Service:
Market.link: https://market.link/

APIs used:
OpenWeatherMap: https://openweathermap.org/
Alpha Vantage: https://www.alphavantage.co/
CryptoCompare: https://www.cryptocompare.com/

Learn more about Chainlink :
Documentation: https://docs.chain.link/docs/getting-started
Discord: https://discordapp.com/invite/aSK4zew - Very active and developer focused!
Website https://chain.link
Building DeFi Applications: https://defi.chain.link/
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial

---Updates---
👋 The ropsten testnet is no longer supported. You can follow this video along, but just be sure to use kovan or rinkeby. Otherwise, you can use this video to show how to get up to speed with metamask: https://www.youtube.com/watch?v=P7FX_1PePX0

Get started with Metamask, an Ethereum wallet that you’ll need to start building your decentralized applications. We teach you how to install, configure, and fund your Metamask wallet with Ropsten LINK and ETH.

Documentation for setting up Metamask: https://docs.chain.link/docs/install-metamask

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.

Metamask download: https://metamask.io/download.html

NOTE: Ropsten is currently down, please use Kovan or another testnet instead:
Kovan LINK faucet: https://kovan.chain.link/
Kovan ETH faucet: https://faucet.kovan.network/
Kovan LINK address: 0xa36085F69e2889c224210F603D836748e7dC0088

Ropsten ETH faucet: https://faucet.ropsten.be/
Ropsten LINK faucet: https://ropsten.chain.link/
Ropsten LINK contract address: 0x20fE562d797A42Dcb3399062AE9546cd06f63280

Learn more about Chainlink
Documentation: https://docs.chain.link/docs/getting-started
Discord: https://discordapp.com/invite/aSK4zew Very active and developer focused!
Website https://chain.link
Building DeFi Applications: https://defi.chain.link/
Twitter https://twitter.com/chainlink
Telegram https://t.me/chainlinkofficial