The message "Cannot read properties of undefined" is javascript-ese for trying to use an object that doesn't exist, or is null in other lanugages. I don't see a "providers" property or method being called anywhere in the code you posted, so that...

Flutter

blockchain

Getting errror sending transaction : typeerror: cannot read properties of undefined (reading 'providers') in blockchain app in flutter

7 Feb 2024 by Karthik Shettigar

import 'package:flutter_web3/flutter_web3.dart'; import 'package:web3dart/web3dart.dart' as web; import 'package:web3dart/credentials.dart'; String currentAddress = ''; bool get isEnabled = ethereum != null; bool get isConnected =isEnabled &&...

Flutter

blockchain

How to Write Your ERC20 Tokens

2 Jan 2024 by Viktoria Dolzhenko

Creating an erc20 Token using the hardhat Package and Typescript

Typescript

blockchain

security

DAO. Short and Clear. Let's Create Our Own.

12 Oct 2023 by Viktoria Dolzhenko

An introduction to the concept of DAO and a workshop on how to create your own

Typescript

blockchain

security

Infura HTTP method GET not allowed

22 Nov 2022 by Member 15839774

https://i.stack.imgur.com/GXX9...

Javascript

nft

blockchain

How to correctly mint a NFT with any ERC20 token using react app & smart contract? Code w/ explanation provided below

15 Nov 2022 by tdev00

Problem/Clarification: I have a NFT minting DApp that mints with multiple ERC20 tokens. I'm having an issue with the react code which calls the smart contract minting function multiple times. When a user mints with their preferred ERC20...

HSMs For Cryptos: Bitcoin, ETH & Stuff

28 Oct 2022 by F. Aro

Using HSMs for Crypto Wallets Creation, Storage and Transactions Signing for Bitcoin, Ethereum

Why am I getting an identifier error at the line simplestorage[]

22 Sep 2022 by Eshu 2022

//SPDX-License-Identifier: MIT pragma solidity ^0.8.7; import "./simplestorage.sol"; contract storagefactory{ simplestorage[] public Simplestoragearray; function createstor() public{ simplestorage Simplestorage = new...

blockchain

Engineering school coding project ideas

2 Aug 2022 by taha Dec2021

I'm an engineering student and I need to make a programming project in a group of 4 in around 5months, what are some project ideas I can make? I was thinking about something related to AI or blockchain, or a game with AI but please not chess. ...

Python

Java

artificial-intelligence

engineering

blockchain

Engineering school coding project ideas

2 Aug 2022 by Tomaž Štih

Poor mans' Elon Musk rocket landing with machine learning. You need: 1) very simple and limited physics engine (a rocket behavior simulator, where you can do your flights and train your net) 2) deep neural net to learn how to fire motors based...

Python

Java

artificial-intelligence

engineering

blockchain

Python :need help in blockchain code and store or transfer hashes on a local database

11 Jun 2022 by Richard MacCutchan

You already posted this question at Python :need help in blockchain code and store or transfer hashes on a local database[^]. Please do not repost.

Python :need help in blockchain code and store or transfer hashes on a local database

11 Jun 2022 by Ayesha Tassaduq

Hi I am a beginner in python and I am working on the blockchain I want to store any hash that creates by any transaction. I want to transfer that hash to a local database. Can anyone tell me how can I do that? Here is my code. can anyone give me...

Python :need help in blockchain code and store or transfer hashes on a local database

11 Jun 2022 by Richard MacCutchan

In your client code you have the following at line 12: sock.sendall(bytes(data,"utf-8")) But you have not declared data, or created any information to send.

What are the functionalities that a dapp allows?

19 Mar 2022 by Depsu14

I would like to create a Dapp based on conflict resolution in neighbourhood communities. This would include functionalities such as a noticeboard or the creation of a group chat. Is it possible to build such an application on a Blockchain or...

blockchain

What are the functionalities that a dapp allows?

19 Mar 2022 by Richard MacCutchan

Quote: I have searched for information. Where did you search? Google has lots of information Dapp - Google Search[^].

blockchain

How can I run this project?

30 Dec 2021 by oisonan1999

Hello everyone! I downloaded this project from github for the purpose of learning about blockchain and DDos. But the project does not talk about detailed steps to run the code, so it is really difficult for me to successfully run this project....

Python

Javascript

blockchain

How can I run this project?

30 Dec 2021 by OriginalGriff

We can't provide tech support for every project on the internet: there are just too many. Instead, you really need to talk to the original author and see how he can help by raising an issue on Github. Either he will help you or he will not...

Python

Javascript

blockchain

Engineering school coding project ideas

7 Dec 2021 by OriginalGriff

We can't tell you "do this" - we have no idea of your interests (which are important as they encourage you to complete the task well), your abilities, your skills, ... and most important of all, what your teacher expects you to produce! A task I...

Python

Java

artificial-intelligence

engineering

blockchain

Node js + blockchain

19 Nov 2021 by Member 15436954

Good morning everyone, how are you? hope so. So I am seeking insight into an issue involving the logic behind programming a cryptocurrency exchange. I'm trying to understand how every internal issue of an exchange works. Come on. I want...

Node js + blockchain

19 Nov 2021 by Greg Utas

You are asking a BIG question, and it isn't clear what you need help with. The following is based on my understanding, but I am not an expert in this. An exchange has a wallet of its own. This wallet holds all of the tokens that users have not...

How do I develop e-voting dapp

26 Aug 2021 by OriginalGriff

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for...

I cant understand why I'm getting parse error in the for loop?

2 Feb 2021 by Member 15062236

pragma solidity 0.6.0; contract Countries{ struct Places { string country; string state; } Places [] public places; for(i=0; i

Node.js

Truffle

blockchain

I cant understand why I'm getting parse error in the for loop?

2 Feb 2021 by Richard Deeming

From a brief glance at the Truffle documentation[^], it looks like a contract cannot directly contain executable code. Instead, your code needs to be inside a function.

Node.js

Truffle

blockchain