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63 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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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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Ethereum 2.0: A Complete Guide

Found: 6/27/2019
Finder: Blockchaindex robot
The Ethereum network is one of the largest and most widely used blockchain networks in the world. It is also one of the world’s largest open source projects with go-ethereum being one of the largest projects on Github. Since its first release in 2015, Ethereum has been making strides towards its ultimate goal of becoming a decentralized global computer that could one day replace many of the centralized applications that we use in everyday life. However, the Ethereum community and network still has much work to do before this goal is realized. This article will briefly explain Ethereum’s progress up until the present and then discuss the network’s upcoming and much anticipated release. This release is known as Ethereum 2.0 or Serenity (used interchangeably from now on). It will be the largest and most comprehensive update ever implemented by the Ethereum community.
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The myth of the ERC-20 token “standard”

Found: 6/27/2019
Finder: Blockchaindex robot
To be fair, we held a similar view, until we audited the top 100 ERC-20 Ethereum tokens from a business logic perspective. We felt this was necessary even though most tokens have undergone security audits, since security audits may not uncover business outcomes which affect token holders. We had to do this audit for because we’re launching the Basket Protocol, an open-source protocol that allows for the creation of non-custodial asset management products. Since our protocol relies on the fact that smart contracts are first-class citizens in Ethereum that can own and transfer ERC-20 tokens, it’s critical to understand token interactions in happy paths and edge cases alike.
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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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Start and Deploy your Own Fully Synced Ethereum Node in Under 10 Minutes

Found: 6/25/2019
Finder: Blockchaindex robot
Deploying a smart contract these days is easier than you think. By combining a popular framework called Embark with Chainstack’s capability to quickly deploy Ethereum nodes on the Mainnet, smart contract deployment is as easy as sending an email.
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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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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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