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 tried installing web3, but I got the error in the picture below. I installed VS build tools using the link VS Code provided but I'm still getting the same err
I was creating the DApp and succeeded to mint NFT in Rinkeby using IPFS (pinata) & Nethereum (C#). Now, I can get TokenURI using tokenURI function in ERC721
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
My code for concatenating 2 strings is pretty simple: string baseUrl = "http://localhost:8080/"; string url = baseUrl.append(url_secret); But I have got an err
I am requireing chai like this const BigNumber = web3.BigNumber; require('chai').use(require('chai-bignumber')(BigNumber)).should(); and during test let balanc
I can't deploy compiled free ton solidity smartcontract through tonos-cli. > tonos-cli deploy Hello.tvc tonos-cli.conf.json Config: /ton/solidity_deploy/hel
Free TON Solidity. How to get hash from data encoded into cell? tvm.hash() analogue?
Free TON Solidity code or execution error. Can't understand my mistake, I already compact the code to the minimum: cat ./SimpleStorage.sol pragma solidity >=
I have few different options in the command line: fetch and start. What is the difference between them?
I would like to compute the sha256 of a string in a Free TON-Solidity contract, I do it by storing the string in a TvmBuilder and then passing it as a TvmSlice
I'm writing an NFT smart contract using the OpenZeppelin ERC721Full contract. I'm able to mint NFTs, but I want to have a button that enables them to be bought.
i have copied a contract from openzappline. but when i compile it on remix it gives me the error....that utils/context.sol is not found. here is the import prag
I try to run solidity coverage for testing test case and its coverage but when I run coverage command its give error like this : - command used (truffle run cov
I am using Hardhat hackathon boilerplate and calling my smart contract's (address 1c0, addresses shortened for clarity) function MyContract#addProduct from the
I have two contract, I write in in one file, named Sum.sol. The sum contract invoke Add contract. I just want to test cross-contract invoking. If I didn't put t
I have wrote the smart contract for creating ENS subdomain name. I need to pass the reference ETH address record for that created subdomain name. pragma sol
I am developing an NFT collection using ERC721 token. But I would like to know how a particular nft is held by a particular customer? I am sensing there are two
I want to know how OpenSea system read contract and call functions. So, I try to write a ERC721 contract without import any other code. // SPDX-License-Identifi