#smart-contracts

A Deep Dive into the MythX Smart Contract #security Analysis #api
▻https://hackernoon.com/a-deep-dive-into-the-mythx-smart-contract-security-analysis-api-3c2cd8e6

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This week, we launched five challenges as part of the Ethereal Virtual Hackathon with a prize pool of $6k (paid in crypto, obviously). This quick guide explains how to perform an analysis with MythX API.What is MythX?MythX is a security analysis platform for #ethereum smart contracts. It performs a comprehensive range of industry-leading analyses on smart contracts, including input fuzzing, static and symbolic analysis.The goal of MythX is to make security analysis available to all Ethereum developers — even those who are not security-savvy. In the ongoing Hackathon we award prizes in five categories. For more details on the requirements and prizes check out the Gitcoin issues:Foundational ToolsContinuous Integration ToolsIDEs and Code EditorsWeb appsFreestyleHow MythX API worksMythX clients (...)

#hackernoon-top-story #smart-contracts

“Bankers Rounding” for Smart Contracts
▻https://hackernoon.com/bankers-rounding-for-smart-contracts-2bccd0b664?source=rss----3a8144eabf

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Hello everyone! My name is Anton, and I’m the CTO at crypto.tickets. Crypto Tickets has developed the new decentralized ticketing protocol that protects tickets from being counterfeited or double sold. The appeals of Crypto Tickets for event organizers are the abilities to control the secondary market, retain extra commissions on every ticket resale, prohibit resales entirely, or allow resales only for authorized fans. This technology is designed to be an add-on for any ticket selling technology on the market.Integers?As you know, #ethereum smart contracts can’t handle real (floating point) numbers easily. So, we all work with integers.Still, if you work with percentages, you will have to divide one number by another. That’s where rounding comes in. For example, imagine you need to send (...)

#blockchain #smart-contracts #solidity #bankers-rounding

Smart Contracts — A Simple yet Comprehensive Explanation in Pictures
▻https://hackernoon.com/smart-contracts-a-simple-yet-comprehensive-explanation-in-pictures-bc21c

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Smart Contracts — A Simple Yet Comprehensive Explanation in PicturesWhat exactly are Smart Contracts? The technology community seems to be fascinated by them.This article will focus on bringing some reality to this fascination, by providing you the truest explanation of what they are and what they can do.Before we delve any deeper into the subject, I have to dedicate a section below to describe What Smart Contracts are NOT. This is purely to address some of the misconceptions of this technology that have become popular in the community.If you are new to #blockchain and Cryptocurrencies, feel free to skip this section below, and head straight to the next section.What Smart Contracts are NotA simple Google search on the internet would yield the following definitions for Smart ContractsThe (...)

#smart-contracts #ethereum #software #hackernoon-top-story

From #ethereum to Infinity. Functional Smart Contracts Compliance with Community Requirements
▻https://hackernoon.com/from-ethereum-to-infinity-functional-smart-contracts-compliance-with-com

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What could be better than an automated process that eliminates mediation, bureaucracy and saves the whole enterprise budget? Only a well-tuned algorithm that works properly and guarantees execution.Ethereum Platform has opened up smart contracts to the world and presented the new generation #blockchain to humanity.It should be realized that the smart contracts created on the Ethereum Virtual Machine are far from ideal, so today we will understand the following:what are smart contracts;what vulnerabilities are known;are there any alternatives to the Ethereum Platform.Common smart contracts understandingIn short, smart contracts are invariable contractual obligations with automated (or automatic) execution, presented in the electronic protocol form, written using computer code.The smart (...)

#smart-contracts #software-vulnerabilities #blockchain-technology

Understanding How Artificial Intelligence Can Make #blockchain Safer and Smarter
▻https://hackernoon.com/understanding-how-artificial-intelligence-can-make-blockchain-safer-and-

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In the AI field, you can build smart Machine Learning algorithms or impressive Neural Networks, but this powerful technology could be trustable or could generate intelligent responses based on the data you use when you train it.As I wrote in my article: Understanding The Gold Rush of Scalable and Validated Data powered by Blockchain and Decentralized AI for Hackernoon:The best results in the AI field are in closed and well-defined ecosystems, such as video games, where AI algorithms have beaten every world champions, even in DOTA 2, considered one of the most complex video game in the industry… …In open environments like social media or big data, AI’s algorithms have performed less, or sometimes AI’s results are dangerously wrong.Wait but why?In scripted environments like video games, you (...)

#smart-contracts #artificial-intelligence #blockchain-ai

#tezos smart contracts with #reasonml, Docker and a sandboxed node
▻https://hackernoon.com/tezos-smart-contracts-with-reasonml-docker-and-a-sandboxed-node-89df929c

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This article will walk you trough using tezos-environment-manager to implement smart contracts in ReasonML.▻https://tezos.comWhat will you learn?You’ll deploy a simple Tezos smart contract written in ReasonML, using tezos-environment-manager. You’ll call the smart contract using sotez to verify the deployment. All of this will happen in a local, private and sandboxed Tezos blockchain.What is Tezos?Tezos is a blockchain technology, or in other words — a platform that allows you to build decentralised applications by implementing a blockchain ledger and smart contract support. You can learn more here.Setting up Tezos Environment ManagerTezos Environment Manager (TEM), is a toolkit for building decentralised applications and smart contracts on top of Tezos blockchain. To start a project based off (...)

#smart-contracts #tezos-smart-contracts

3 Real-World Use Cases of #blockchain Smart Companies
▻https://hackernoon.com/3-real-world-use-cases-of-blockchain-smart-companies-b8462fa009fb?source

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2019 — It’s time to Walk the Blockchain TalkIn the awakening of 2019, after some ups and downs in the crypto market (okay, mostly downs), it’s time to take a good look at the Blockchain community and explore its real-world applications.We’d like to take a step further in the game, and start the conversation about use cases of a Smart Company (SC).A quick pause — what is a Smart Company?Simply put, a Smart Company is a hybrid of real-world International Business Company (IBC) and Decentralized Autonomous Organization (DAO). Whereas a DAO is not legally recognized, a Smart Company is. Needless to say, this is an important distinction.As legally compliant entities, Smart Companies can provide significant advantages in the ownership structures of a company. Having all your shares as tokens offers a (...)

#compliance #entrepreneurship #tokenization #smart-contracts

Architecting a #hyperledger Solution — Things to keep in mind
▻https://hackernoon.com/architecting-a-hyperledger-solution-things-to-keep-in-mind-78033e6fee75?

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Architecting a Hyperledger SolutionAt the time of writing this article, there are not many resources available to derive the nodes and architect a Hypderledger Fabric solution. I hope this post will bring some amount of clarity in designing an enterprise level hyperledger fabric solutionYou will have to keep following things in mind while architecting a hyperledger solution –1. Fabric has a highly modular and configurable #architecture suitable for a broad range of industry use cases including banking, finance, insurance, healthcare, human resources, supply chain.The Fabric platform is also permissioned. Unlike a public permissionless network where the participants are known to each other, instead fabric is anonymous and therefore fully untrusted. This means that while the participants may (...)

#blockchain #smart-contracts #blockchain-technology

The Strangest Smart Contract Bug You Haven’t Heard About
▻https://hackernoon.com/the-strangest-smart-contract-bug-you-havent-heard-about-a6ebc8dbc0a5?sou

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A bug.Note: I have no intention of discrediting the project or anyone involved with it. The beautiful part about crypto and smart contract development is all of the code is on display. I’m just commentating on a monumental screwup and a very interesting situation.Legolas Exchange (LGO) raised ~$30M USD early in 2018 and deployed an ERC-20 token on #ethereum. The token has a peculiar feature built into the code that is supposed to reward hodlers (sic). For every 6 month period in the first 2 years, all of the accounts that haven’t moved their funds yet should receive an additional 5% in tokens as a reward for their loyalty. The reward has the potential to be higher than 5% — increasing as others abandon their rewards.Sounds great right?Unfortunately the immutable contract was coded such that (...)

#smart-contract-bug #security #smart-contracts

The #evm Is Fundamentally Unsafe
▻https://hackernoon.com/the-evm-is-fundamentally-unsafe-d69f2e3b908b?source=rss----3a8144eabfe3-

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An in-depth examination of the #ethereum Virtual Machine vs. Kadena’s Pact smart contract languageOver the past three years of smart contract development, the cryptocurrency community has seen smart contracts written in Solidity subverted by a variety of bugs and exploits (the DAO exploit, the Parity multi-sig wallet bug, etc.), and it is common to pin the blame for the preponderance of unsafe smart contracts on the Solidity smart contract language and its many quirks. However, we maintain that some of the worst flaws in Solidity — a lack of inspection and traceability, the opacity and illegibility of code on-chain, and expensive, slow, and dangerous calls to external smart contracts — stem directly from foundational design decisions in the architecture of the Ethereum Virtual Machine (...)

#ethereum-virtual-machine #smart-contracts #kadena-pact

DApp and Things You Need to Know
▻https://hackernoon.com/dapp-and-things-you-need-to-know-4f50853a4cb7?source=rss----3a8144eabfe3

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The application built on the #blockchain, known as “DApp”, has many different characteristics than the traditional application. With the rise of the #cryptocurrency market, more and more developers started to have their eyes on applications on the blockchain. After more than a year of exploration and development, many #dapps have emerged. This article is a comprehensive introduction to the current types of DApp.Gamers out there, have you ever been bugged by :Game developers suspending game operations with short notice;Hundreds of hours of time wasting on leveling your characters that get deleted;Another hundred of hours of time forging the best weapon that get nerfed in new updates;Game developers releasing OP (overpower) weapons or armors for profit that make the game imbalance;Game developers (...)

#ai #smart-contracts

#bitcoin Cash Smart contract
▻https://hackernoon.com/bitcoin-cash-smart-contract-a2c92e8f07a1?source=rss----3a8144eabfe3---4

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Bitcoin Cash Smart contractsToday I want to speak something interesting. It’s about Smart contracts on top of the Bitcoin cash #blockchain. For those of you who don’t know what is Bitcoin cash. Bitcoin cash is a hard fork of the Bitcoin Blockchain in which people spoke about scalability and transaction fee, the volume of transactions. i.e in simple words Bitcoin, the community decided to create a new blockchain which can accommodate a larger size of blocks and less transaction fee on the transactions. Apart from all that instant transaction is there to blow up your mind, I mean practically no that instant but its really better than bitcoin transaction speed. If you don’t know what is a fork, let me help you to understand it, A hard fork is a permanent divergence from the (...)

#bitcoincash #ethereum #smart-contracts

Columbia University to Support Smart Contract R&D
▻https://hackernoon.com/columbia-university-to-support-smart-contract-r-d-c595ec815255?source=rs

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Despite its incredible proliferation in the past two years, the #blockchain is still a relatively novel technology, requiring continual development and maturation before it can attain the prominent role that many expect it to play in the digital age.QTUM, an open sourced public blockchain initiative, is donating $400,000 to academics at the University of Columbia who are advancing blockchain #research in several ways. The grant is being extended to Ronghui Gu, Columbia University’s assistant CS professor who will oversee blockchain research being conducted by post-doctorate and Ph.D. students.As it relates to its original purpose, facilitating cryptocurrency transactions, the blockchain has made incredible cultural inroads, inspiring hundreds of token projects and facilitating the global (...)

#smart-contracts #columbia-university #qtum

Top 7 #blockchain Technology Trends to Watch in 2019
▻https://hackernoon.com/top-7-blockchain-technology-trends-to-watch-in-2019-32166c3d6e56?source=

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The evolution of blockchain for the past few years have been breathtaking. From a technological perspective, it has pushed new boundaries, but that doesn’t mean it is still out of its infant stage. When compared to other technologies out there, it still has a lot to offer.Today, I will be exploring 7 blockchain technology trends you should watch out in 2019. These trends will help you gauge what to expect from blockchain in the upcoming year.Blockchain Trends to Watch in 20191. Blockchain As A Service(BaaS)The blockchain is undoubtedly one of the revolutionary technologies of the 20th century. It is so game-changing that plenty of startups and enterprises are working on their own blockchain solution. However, it is not always feasible to create, maintain and manage your blockchain (...)

#sto #blockchain-technology #security-token #smart-contracts

How to build a simple Front End for your #eos smart contract
▻https://hackernoon.com/how-to-build-a-simple-front-end-for-your-eos-smart-contract-3f9289e8146c

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We are going to build a simple Front End that interacts with an EOS smart contractOur simple front end: Login PageI have always been a big fan of React from the very beginning, but lately I have been playing around with Vue and have to admit that I really fell in love with it for it’s simplicity. To keep things simple as possible for you, I have decided to use Vue to build our front end this time.NOTE: If you have not tried out Vue, their official documentation is the best place to start.Create a Vue ProjectStart by installing Vue, open up terminal and type this:npm i -g @vue/cliNow that Vue is installed we are going to use it’s CLI to create our projectvue create eos-loginWhen prompted choose “Manually select features” then, use the space bar to select Babel, Router and Vuex feature. For the (...)

#smart-contracts #vuejs #blockchain #javascript

Upgradeable #ethereum Contracts V2
▻https://hackernoon.com/upgradeable-ethereum-contracts-v2-786d9c18cd9d?source=rss----3a8144eabfe

Getting the most out of delegatecallLooking for the code?I’m a blockchain architect and developer at Design is Dead, check us out!A couple of months ago I wrote my first blog post about upgradeable smart contracts on the Ethereum blockchain. We explained that once a smart contract has been deployed onto the blockchain it cannot be changed (Ethereum currently does not have block finality, so this is probabilistic).Wait? Not being able to upgrade code after launching it? That seems like a bad idea, especially if you’re used to an agile development cycle. And while guaranteed code execution can be a benefit, when there is a bug it is the total opposite. Bugs in smart contracts have caused millions of dollars in losses and even gave birth to Ethereum as we know today, after one of the most (...)

#ethereum-contracts-v2 #upgradeable-contracts #smart-contracts #solidity

Potential Attack On #ethereum Network to Mint GasTokens
▻https://hackernoon.com/potential-attack-on-ethereum-network-to-mint-gastokens-5cf05a7e0303?sour

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▻https://btcmanager.com/overview-of-recent-ethereum-attacks-impact-on-the-network/By Abhishek sharma Security Auditor at QuillAudits.Ethereum Network VulnerabilityThe latest vulnerability, in ethereum framework uncovered by levelk, Potentially allows bad actors to mint large amounts of Gastokens or drain funds.Discovered by whom ?In levelk’s hypothetical study or in a case study it is possible to mint large amount of GasTokens while receiving ETH or any ERC20, or other standard token.The vulnerability that comes in light when fallback function of a receiver contract is able to carry out capricious computations that the transaction producer pays for, which comes with a risk of ‘griefing’.What is a griefer ?A griefer or bad faith player is a player in a multiplayer video game who deliberately (...)

#blockchain #mint-gastokens #ethereum-attack #smart-contracts

Incentive Tracking System
▻https://hackernoon.com/incentive-tracking-system-85935089d356?source=rss----3a8144eabfe3---4

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SourceProblemFor every sale, salesmen are rewarded with an incentive. Tracking these sales is very important. It will help the organization give accurate incentives to the sales executives.When the organization is small with less number of employees, this system can be easily implemented on a traditional relational database.However, the problem arises when the organization is a spread across multiple cities across the globe. That is when we need to have a system which can operate at a global scale and the data in the system can be tracked easily.We cannot remove the incentive system because incentives helps the sales executives to work efficiently and perform even better.Thankfully, enterprise blockchains can help us solve this problem.SolutionAs stated in the previously, I intend to (...)

#incentive-tracking-system #blockchain #game-theory #smart-contracts #incentive-tracking

Transforming #healthcare: #blockchain based Medical prescription tracking
▻https://hackernoon.com/transforming-healthcare-blockchain-based-medical-prescription-tracking-5

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credtis — google.comThe directions in which blockchain technology is evolving, health care holds a prominent position. And there are a number of good reasons for its prominence. Companies in healthcare and other industries are already testing waters and developing solutions on Blockchain.The MediLedger Project, backed by a group of companies that includes pharma giants Genentech and Pfizer, has successfully piloted a program that uses blockchain to track medicines. They aim to track the entire supply chain of medicine from the manufacturer uptill the patient.Blockchain technology is seeing great success in real-world applications that utilize supply chains. Given the very nature of the immutable and distributed ledger enabled by blockchain, the potential for using the revolutionary new (...)

#hyperledger #healthcare-technology #smart-contracts

#security Audits, Essential yet Neglected!
▻https://hackernoon.com/security-audits-essential-yet-neglected-130e9af974fe?source=rss----3a814

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Image Ref. — Quill Audits“Blockchain technology is no more Nascent”, rather, its immense potential is being realised by governments and enterprises all around the globe. Traditional businesses from fields like healthcare, agriculture, finance and transportation have already integrated #blockchain in their supply chains, and made business records secure and immutable. The adoption of cryptocurrencies by governments of Ohio and Florida further strengthens my point.As we adopt something new in our lives, critics too, find their way to creep in. Rather than giving facts on the how blockchain use cases have transformed a business process, media reports have highlighted the cases where millions of dollars were stolen from a blockchain ecosystem-DAO Hack — $150 Million StolenParity — $300 Million (...)

#cybersecurity #audit #smart-contracts

A simple framework for understanding smart contract applications
▻https://hackernoon.com/a-simple-framework-for-understanding-smart-contract-applications-18fd780

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Why blockchains and smart contracts will be useful for both digital and physical assets.via @unsplash by Vincent van ZalingeIn this short piece I will propose a simple and intuitive approach to smart contracts that presents two categories of use cases: 1) internal enforcement and 2) external enforcement. For both of them I will present some examples as well as a brief discussion of their limitations. The goal here is to cut away all the buzz and fog around their potential applications and provide a simple and intuitive starting point for future discussions. Having read many articles and posts regarding smart contracts, I feel the lack of the segmentation I will present below leads to a lot of confusion surrounding their applications, often resulting in a) an over estimation, or b) a (...)

#cryptocurrency #blockchain #smart-contracts #ethereum #bitcoin

#hyperledger Fabric + Convector + Convector CLI (JavaScript only)
▻https://hackernoon.com/hyperledger-fabric-convector-convector-cli-javascript-only-f4a0919b11c1?

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Are you new to #blockchain? You may have probably already heard about the amazing work that the Linux Foundation has done with Hyperledger Fabric. It’s a modular framework for building permissioned blockchain networks.Here I want to showcase how to create your own smart contract system in an easier way that you would expect. And with the only #javascript!I will use as a baseline the design from the Fabric-Sample repo FabCar, I won’t change its design, only migrate the code to Convector Framework.As the title mentions, I’ll be using the new Convector CLI with Hyperledger Fabric as the underlying blockchain technology.npm i -g @worldsibu/convector-cliconv new fabcar -c carcd fabcarnpm iWhat you get by running that command is a whole JavaScript structure for a Fabric smart contract (...)

#development #smart-contracts

Smart Contracts, Part 2: The Legality
▻https://hackernoon.com/smart-contracts-part-2-the-legality-761cc4be100d?source=rss----3a8144eab

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The legality of smart contracts is often ambiguous — regulations need to be clarified, and a smart dispute-resolution system must be created. The past few years have seen a global spike in the excitement over smart contracts and the #blockchain technology that supports them. But not everyone has gotten carried away, Wharton Legal Studies Professor Kevin Werbach is one such person.In a recent podcast, Werbach said, “Even though we think machines can render contracts effectively, there are lots of situations where they cannot.” This is a good rejoinder to those who proclaim that smart contracts have ‘solved’ contract law or that we can build a future without traditional government or legal systems.“Even though we think machines can render contracts effectively, there are lots of situations where (...)

#cryptography #smart-contracts #smart-contract-legality #ethereum

A 101 Noob Intro to Understanding Smart Contracts on #hyperledger Fabric
▻https://hackernoon.com/a-101-noob-intro-to-understanding-smart-contracts-on-hyperledger-fabric-

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How do I get started with dapp (decentralized app) development on Hyperledger Fabric Platform?This is the question I get every time I do a talk about Hyperledger Fabric. So this post will serve as my official answer to those that have asked in the past, and those that will ask in the future ⏳. I will outline my favorite material that has helped me get a good grasp on Hyperledger Fabric, and #blockchain in general. I will first start with general blockchain concepts as implemented by Bitcoin and then move towards more specific Hyperledger reading materials. Having a solid understanding of how Bitcoin works, and the public key cryptography that Bitcoin uses to transact securely without double-spending is essential to understanding how Hypereledger works.Blockchain 101☕️+ ?= understanding (...)

#ethereum #smart-contracts #dapps

AI Smart Contracts — The Past, Present, and Future
▻https://hackernoon.com/ai-smart-contracts-the-past-present-and-future-625d3416807b?source=rss--

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AI Smart Contracts — The Past, Present, and FutureSmart contracts, known to be used with the #blockchain technology, is a computer program that directly controls the transfer of digital currencies or assets between parties under certain conditions.Smart contracts, contrary to traditional contracts, covert the agreement statements into a computer program with code. A smart contract not only defines the rules and penalties related to an agreement in the same way that a traditional contract does, but it can also automatically enforce those obligations.It has the potential to disintermediate industries such as the legal and financial fields by simplifying and automating routine and repetitive processes for which people currently pay lawyers and banks hefty fees to do.How Do Traditional (...)

#smart-contracts-history #smart-contracts #future-of-smart-contracts #ethereum