Smart Contracts Design Patterns Series! Introduction Oracles are used to connect decentralized systems to the off-chain world. In other words, oracles are bridges between the off-chain and the on-chain systems. Based on the data flow and request directions, oracles can be categorized in four ways: — Pull based inbound oracle: Blockchains…

Learn how blockchain oracles bring web 2.0 data to web 3.0 by building a simple weather oracle with solidity and node.js — Oracles on the blockchain are frameworks that allow for the blockchain world to interface with data from the rest of the web, we’ll call this the web 2.0 world. As applications of smart contracts continue to expand, so will the variety of data needed to tackle unique use cases.

On April 7th, after Aave V3 had launched for 3 weeks, we discovered an issue on Aave V3’s price oracle. To be more specifically, the fallback oracle. After initially failing to reach out to Aave, we contacted @samczsun who helped notify the Aave team and the issue was resolved promptly…

Random Number Generation (RNG) is an important part of applications that require non-deterministic results. This includes encryption systems and gambling software. In this systems, a random number is needed to provide a result that cannot be based on finality, but probability. Encryption algorithms use salt, as a way to add…

Verifiable Random Functions and how to use them. Chainlink (ChainLink on Medium) is slowly getting integrated into more and more blockchains, dApps, decentralized games, and even within de-fi applications. But what it is, and more importantly, how do I use it? …

We’re excited to announce that Aworld — a collection of 10,000 original hand-painted NFTs — has integrated Chainlink Verifiable Random Function (VRF) on the Ethereum mainnet. By integrating the industry-leading decentralized oracle network, we now have access to a tamper-proof and auditable source of randomness needed to assign random species…

Introduction Price feeds addresses can be found here : https://docs.chain.link/docs/ethereum-addresses/ Price feeds provide conversion rate between two assets.

Know the types of oracles and their practical use cases — Oracles, ideally, provide a simple way of getting extrinsic (i.e., “real-world” or off-chain) information, like the price of currency pairs, the price of gold, or truly random numbers, onto the Ethereum platform for smart contracts to use. Blockchains and smart contracts cannot access off-chain data (data that’s outside of the…

In this piece, my first ever crypto thought piece, I’ll be taking a deep dive into Chainlink; what Chainlink is, how it fits into the crypto ecosystem, and where it’s headed in the future. …