When I run npx hardhat console --network rinkeby accounts = await ethers.provider.listAccounts(); I get Uncaught ProviderError: Must be authenticated! with bel
I'm using nethereum & unity with infura. (I'm developing an DApp.) I wrote some code for minting new NFT, and tested, and it worked very well. However, afte
I am developing an application on Ethereum blockchain. I use Solidity for contract and Nethereum c# library to connect to the contract. I am somehow new in Ethe
I am writing a script for a smart contract that I'll deploy using hardhat. I'm confused on the difference between .deploy() and .deployed(), what does each one
I'm trying to complete the simple collectible NFT tutorial from this freeCodeCamp video. (I'm getting stuck on the script that starts exactly where the link is
I am working on a project where I need to send ether from an user to a smart contract and from the smart contract to the user. The smart contract is code in Sol
An address in Solidity can be an account or a contract (or other things, such as a transaction). When I have a variable x, holding an address, how can I test if
I'm building a minting site that requires me to check the number of NFTs minted and display that number in real time to the user. At first I was just making a r
I am familiarizing myself with smart contract development using the brownie framework and solidity. To start of I was using the brownie console to deploy some s
Basically, I'm trying to make the smart contract be able to take exactly 0.05 eth ONLY when the cooldown timer is set to 0. The Dapp I'm creating is a first com
I deployed the following smart contract on Ropsten ethereum test network and afterwards I tried making a transaction using @alch/alchemy-web3 npm package (Yes,
I am new to using hardhat and I was trying to figure out how it is working. The documentation seems a little bit fuzzy as there are multiple layers of abstracti
I've been trying to create simple mobile app prototype (in Flutter) which would allow you to connect to a Wallet and obtains your address(es). I cannot get the
How can I programmatically discover how much ETH is in a given account on the Ethereum blockchain?
How can I differentiate between ERC20 and ERC721? without checking Etherscan
How do I concatenate strings in solidity? var str = 'asdf' var b = str + 'sdf' seems not to work.. I looked up the documentation and there is not much mentione
I am interacting with my own smart contract. It's a very simple one. // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract ERC20 { string public n
I am getting invalid sender when trying to send a signed transaction. Here is the error: Uncaught (in promise) Error: Returned error: invalid sender and this i
Intro I'm creating a dapp that uses ens. The ens should be automatically displayed for every wallet that owns it. For this I'm using the provider.lookupAddress(
I am interested in building decentralized apps on ethereum and am wondering about the common libraries being used. For example, I've heard of