If I mint a collection of n items on my own address (via smart contract) , it'll be publicly visible on my account under the collected / created section like th
I want to create a contract that buys and sells to a fixed price which can be set with a contract interaction onlyOwner basically i need a token vendor with edi
I have a security problem in my Solidity contracts and I can't figure out how to fix it. The flow goes like this: First, we create an instance of contract A; Cr
I forked a contract, it is a Baked Beans fork on MATIC, I deployed the contract through Remix, now when I try to deposit through my website script, Metamask say
I am trying to switch my contract to use the 'import "@openzeppelin/contracts/access/Ownable.sol”’, but I am getting the following error contracts/I
I am trying to send ETH to a contract function from a web app via metamask and ethers.js. So far I have tried: const provider = new ethers.providers.Web3Provide
I want the best method to implement these two lines. Goal: Obtain the object of a smart contract named dev-token. async function ... { ... const web3 =
PancakeSwap is driving me crazy! I have this simple contract: when the token are transferred from someone different from the owner, instead of making the transe
I am pretty new to development and asking questions on stackoverflow, so if there is something else I could provide, please tell me in comments! I have installe
I have a function in my smart contract where I am trying to return some data that has been stored in the blockchain, function showOrg(address org) external
I'm new to solidity. I'm currently getting the following error TransferHelper: TRANSFER_FROM_FAILED from the safeTransferFrom function. Can someone tell me why?
I have a simple ERC721 smart contract used for testing purposes, I was wondering if it is possible to query the token IDs a specific wallet owns in that smart c
i have the abi json file for a contract and i want to use its functions in my smart contract. is there any way to do it? for example i have a contractA.sol and
just started a solidity coding course and ran into this issue with this code: //SPDX-License-Identifier: MIT pragma solidity >=0.6.0; import "./simplestora
The Solidity's mapping not returns an array inside a struct (when call mapping_data(), the data variable is undefined). Just be able to read it from read() func
The openzeppelin codes of ERC20 token give error in deploying directly. Even after flattern the codes, i am unable to select contract MyToken out of many contra
I keep getting this error, Does anyone know the solution? the code its inheriting, function _mint(address to, uint256 tokenId) internal virtual { // req
In the official waffle documentation you may find the next way to implement fixtures: import {expect} from 'chai'; import {loadFixture, deployContract} from 'et
I am new to truffle and I work on blockchain project so when I "migrate" in truffle develop, this error occurs. Why ? I change the version of my compiler by 4.2
I want to build an NFT that I can paid with an ERC-20 token to mint it. I'm using currently the Mumbai testnet on polygon, and I'm using the Dummy ERC20 token t