News Saturday, July 14

Keccak256 generates 2 hash of the same string

  • I have this struct that represents a piece of information: – – I also have a function that fill these maps: – – As you can se, when I add the new information to the positionToInfo map, I hash the password.
  • I have another function that delete data from this map (positionToInfo).
  • When i check if the data that i want to delete is in the map (thanks the findPosition method) i check if the hashed password (stored in the map) is equal to the hash of the password passed via parameter.
  • Here the code: – – The problem is that the two hashes not match.
  • and then I do: – – the two hash of the same string (password) is not the same.

Tags:

Keccak256 generates 2 hash of the same string

Access contract method via web3

  • This site uses cookies to deliver our services and to show you relevant ads and job listings.
  • By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service.
  • Your use of Stack Overflows Products and Services, including the Stack Overflow Network, is subject to these policies and terms.

Tags:

Access contract method via web3

Scatter – Infinite Possibilities

Tags:

Scatter – Infinite Possibilities

Proxy Contract/Library reverts, cant find out why. (BOUNTY!)

  • my contract reverts on calls to my proxy.
  • All functions on the contract coming from Enabled/Ownable that do not go to my proxy work.
  • I’m using the same pattern in other contracts where it works fine.

Tags:

Proxy Contract/Library reverts, cant find out why. (BOUNTY!)

Smart Contract for Etherium Blockchain On Azure – Automatic Execution on Coin Transfer Event

Tags:

Smart Contract for Etherium Blockchain On Azure – Automatic Execution on Coin Transfer Event

Error: VM Exception while processing transaction: revert due to require statement

Tags:

Error: VM Exception while processing transaction: revert due to require statement

In solidity smart contracts how do you access internal state variables declared in the constructor?

Tags:

In solidity smart contracts how do you access internal state variables declared in the constructor?

solidity – Analize gas usage and contract design – Ethereum Stack Exchange

Tags:

solidity – Analize gas usage and contract design – Ethereum Stack Exchange

Tags:

solidity – What does it mean when a function is called in the head of constructor() function? – Ethereum Stack Exchange

Tags:

solidity – What does it mean when a function is called in the head of constructor() function? – Ethereum Stack Exchange

Top Solidity Courses

Getting Started with Ethereum Solidity Development (6,530 students enrolled)

By Sebastien Arbogast

  • Understand the basic philosophy behind the blockchain and distributed/decentralized applications
  • The basics of how a blockchain generally works, just enough to be able to use it as a development platform
  • Develop a distributed application, from creating a blank project to deploying it in production all the way through writing smart contracts, unit testing them, and creating a user interface for them
  • How to combine the right tools to put together a consistent development environment
  • The fundamentals of the Solidity smart contract language
  • How to use the Truffle build and testing framework
  • How to deploy a decentralized app to various Ethereum instances (testrpc, private chain, test chain, main net)

Learn more.

Ethereum Blockchain Developer: Build Projects Using Solidity (10,937 students enrolled)

By Ravinder Deol

  • Be Proficient In Solidity Programming By Building Projects In This Course.
  • Understand Blockchain Technology At A Theoretical And Practical Level.
  • Be Aware On A Practical Level Of How Smart Contracts Operate.
  • Be Able To Work With The Ethereum’s Major Core Development Tools.
  • Understand The Core Development Functions Of Ethereum.
  • Understand What Decentralisation Is As We’re Working With This Technology.
  • Be Able To Explain The Structure Of A Solidity Clearly Through Practical Examples.
  • Understand How To Use Web3 In Conjunction With The Project We’re Creating.
  • Be Proficient In Advanced Development With Truffle And Ethereum Studio.
  • Complete A Final Assignment Which Consists Of An Ethereum Blockchain Based Curriculum Vitae.

Learn more.

Ethereum : Decentralized Application Design & Development (9,794 students enrolled)

By Rajeev Sakhuja

  • Leverage the Ethereum tools/software such as Wallet, Geth, MetaMask, Remix, TruffleV4, Ganache….
  • Create an ERC20 Compliant token to launch an Initial Coin Offering (ICO)
  • Setup Private Blockchain Network
  • Develop Smart contracts in Solidity using multiple tools such as Web3/Ganache/TruffleV4/Mocha framework
  • Comfortably describe how Ethereum Blockchain works | Ethers, Gas, POW, POS, Nodes …
  • Describe how the Blockchain technologies work | Distributed Ledgers, Consensus, Mining ….
  • Develop UI/front end for Decentralized Application in HTML/CSS/Javascript using web3 libraries
  • Develop end to end Decentralized Applications (DAPP) on Ethereum platform
  • Setup private Ethereum networks for development & experimentation
  • Identify and use the right design patterns for developing smart contracts
  • Architect, Design & Build real use cases on Ethereum platform

Learn more.

The Complete Ethereum Course: Get .001 Ether In Your Wallet (4,273 students enrolled)

By Ravinder Deol

  • Understand how Ethereum, the emerging cryptocurrency works, and get involved with it practically as well as learning the theoretical side of the cryptocurrency.
  • Realise how becoming an early adopter of Ethereum gives you the best chance to capitalize on its rise, as many would have missed the meteoric rise of Bitcoin.
  • Undertake your first ever Ethereum transaction by receiving .001 Ether from me for completing this course, I will of course walk you through how to setup your wallet.

Learn more.

Compile Your First Ethereum Smart Contract With Solidity (245 students enrolled)

By Will Bunker

  • Compile a basic smart contract
  • Set a private blockchain for testing
  • Deploy smart contract to blockchain
  • Call the functions on smart contract.

Learn more.

Learn Solidity: Programming Language for Smart Contracts (3,153 students enrolled)

By Toshendra Sharma

  • Develop Ethereum Smart Contracts using Solidity
  • Understand the basics & advance features of Solidity & Ethereum Virtual Machine
  • Develop their own decentralized blockchain applications

Learn more.





Source link https://jsnews.io/solidity/ethereum-solidity-contractdevelopment-web3js-much-more/

LEAVE A REPLY

Please enter your comment!
Please enter your name here