Developers

Learn how to use Chainlink VRF to generate a random number in a Solidity smart contract and build provably unpredictable outcomes into your Ethereum dApp.

Always test before you deploy. This tutorial covers how to test Chainlink smart contracts in Solidity and JavaScript using testnets, mocks, helper functions, and more.

This tutorial explains how a Chainlink node and External Adapter can be used to integrate a smart contract with an RFID scanner.

This tutorial explains how a Chainlink node and External Adapter can be used to integrate a smart contract to a Tesla vehicle.

This tutorial walks through the development of a simple exchange for call options using Chainlink Price Feeds and covers a multitude of Solidity topics in the process.

Chainlink external adapters make it easy to connect API authentication processes to smart contracts. Here’s an example with the Reddit API and Twitter API, which each require OAuth.

Many smart contracts on Ethereum require an external source of timing to trigger an on-chain action. We show you how your dApp can implement simple time-gated voting using the Chainlink Alarm Clock oracle, enabling blockchain voting in protocols such as DAOs.

Threshold signatures offer a concise, cheap way to verify consensus over very large groups, and we plan to use them to scale Chainlink's security independent of Ethereum's throughput. In this post, we review how they work, describe a new Schnorr-like signature, and introduce our implementation.