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
I am currently learning about NFTs and I reached the point where I deployed the contract and I can mint and everything going well. The only missing part is roya
I'm trying to complete the Dex level of ethernaut challenge which is quite easy. In order to use swap I need firstly to approve token allowance, but I don't und