August 2018
Intermediate to advanced
404 pages
11h 19m
English
Content preview from Ethereum Cookbook
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Fetching data from APIs using solidity
Ethereum virtual machine (EVM), by design, cannot read data from the outside world. This restricts achieving certain functionalities in Ethereum blockchain. Since every node runs every calculation, it’s not efficient to make arbitrary network requests from an Ethereum contract.
We can overcome this limitation with the help of oracles. These allow a smart contract to read data from an external source in an intelligent way. In this recipe, you will learn to create an Oracle service and read data from an external API.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.