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95 Publications found

How we used Ethereum and DAI to create, tokenise and settle a ‘self-executing’ smart invoice

Found: 7/2/2019
Finder: Blockchaindex robot
Note to the reader: The target audience for this blog post are mainly developers familiar with Blockchain and Smart Contracts. We have abstracted away business terms in order to focus on the technical process. Not all developers have strong backgrounds in business, economics and finance. Therefore, we recommend reading our blog post on these aspects. The open-sourced code that we share is intended to be inspirational and we do not hold ourselves responsible for any undesired or unexpected behaviour resulted from its usage.
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Deploying Ethereum Smartcontracts on HyperledgerFabric

Found: 7/2/2019
Finder: Blockchaindex robot
Who This Article is for? This article is for those Who are Currently On Blockchain. knowledge on Ethereum and Hyperledger Eco-Systems is necessary to understand These Concepts. What We Are going to do? The point is very clear that we are going to deploy Ethereum Smartcontracts on Hyperledger fabric Network using Fabric-Evm and doing Cross-Platform check for Ethereum Smartcontracts.
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Compiling and deploying Ethereum Smart Contracts with pure JavaScript.

Found: 6/29/2019
Finder: Blockchaindex robot
The development of Ethereum Smart Contracts has increased exponentially in 2018 and it seems that 2019 will follow the trend. There are some frameworks, like Truffle, that help us in the process of building and maintaining our Smart Contract but if you like to get your hands dirty, I will explain how to compile your Smart Contract and deploy it to an Ethereum network (Rinkeby, Ropsten or Mainnet) with your own scripts.
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Setup a Hyperledger Fabric Host and Create a Machine Image

Found: 6/27/2019
Finder: Blockchaindex robot
During the training and testing on Hyperledger Fabric networks and chaincodes, I always need a “standard” host running Hyperledger Fabric. By “standard” it is nothing more than a Ubuntu host with prerequisite components (link) and Hyperledger Fabric images, tools and samples (link). They are well documented in Hyperledger Fabric documentation. While various cloud providers have their own templates to build such a host, or a more friendly way to launch the whole fabric network, I always encourage those wishing to learn Hyperledger Fabric “do the hard way”, that is, they at least should go through all the step-by-step process once. It helps you understand more about Hyperledger Fabric.
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Solidity Storage Array Bugs

Found: 6/27/2019
Finder: Blockchaindex robot
This blog post is about two bugs connected to storage arrays which are otherwise unrelated. Both have been present in the compiler for a long time and have only been discovered now even though a contract containing them should very likely show malfunctions in tests. Daenam Kim discovered an issue where invalid data is stored in connection with arrays of signed integers. This bug has been present since Solidity 0.4.7 and we consider it the more serious of the two. If these arrays use negative integers in a certain situation, it will cause data corruption and thus the bug should be easy to detect. Through the Ethereum bug bounty program, we received a report about a flaw within the new experimental ABI encoder (referred to as ABIEncoderV2). The new ABI encoder is still marked as experimental, but we nevertheless think that this deserves a prominent announcement since it is already used on mainnet. Credits to Ming Chuan Lin (of https://www.secondstate.io) for both discovering and fixing the bug!
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Creating Shopping Smartcontract

Found: 6/25/2019
Finder: Blockchaindex robot
During the first half of 2019, So many things happened in favor crypto believers. While Bitcoin crossed $11000mark and entire crypto market crossed $300 billion and Facebook launched its own CryptoCurrency libra and ethereum Racing to $350 mark. Major financial firms,Banks are adopting Blockchain technology. Sticking to Ethereum, even though ethereum has excellent use cases, currently dapps are facing scalability issues. but founder Vitalik Buterin says he’s close to fixing the scalability issues.
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Solidity 102 #1: Keeping Gas Cost under Control

Found: 6/25/2019
Finder: Blockchaindex robot
Welcome to Band Protocol’s Solidity 102. In this introductory article, we discuss important points you should be aware when writing performant smart contracts in Solidity. While Solidity’s syntax looks somewhat similar to that of JavaScript or C , its EVM runtime is totally different. Knowing the limitation of EVM and the techniques to workaround those constraints will help you write better Solidity. The article will focus on high level ideas, and we will cover concrete implementations in the subsequent articles of the series.
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TRON Developer Guide—TronGridJS

Found: 6/24/2019
Finder: Blockchaindex robot
TronGridJS is a Javascript library for utilizing TronGrid APIs to retrieve blockchain data from the TRON network. Compatibility Version built for Node.js v6 and above. Version built for browsers with more than 0.25% market share.
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TRON Developer Guide—TRON-STATION—Getting Started

Found: 6/24/2019
Finder: Blockchaindex robot
Tron Station is a web application and Javascript API Library for estimating Tron energy and bandwidth consumption based on Tron network. Developers can quickly review energy and bandwidth points information before deploying/triggering a smart contract or make a transaction.
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A simple blockchain application for data verification

Found: 6/24/2019
Finder: Blockchaindex robot
In this article I’m going to describe the simplest blockchain application that I know, with code examples. This is useful for those starting in the blockchain space as well as a design pattern for more experienced architects. Imagine the following use case. You have received a document that has passed through several hands and you want to make sure that it is authentic. The document might be the service book for a car that you are buying, or it might be a document asserting that the house that you are buying really belongs to the seller. It could be anything.
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