I got an error while deploying contract in Binance Smart Chain plz help me if anybody knows it error message looks like this Deploying 'WhitePaperInterestRat
I am trying to make a basic React component to retrieve a value from a deployed contract. In this example, I am using an input box to receive a contract address
I have some simple ico contracts for airdrop and presale with lock token future to lock token until ico end and I want to know how to connect it to token contra
Whenever I try to compile my solidity contract, the error ParserError: Source \"@OpenZeppelin/contracts/math/SafeMath.sol\" not found: File import callback not
My contract for ERC1155 marketplace to mint buy and sell the NFT. The nft is getting minted , However the NFT is not showing in market place and not able to pur
I have tried changing different versions of solc, solidity, and chainlink contracts but it doesn't work. Error: contracts/Lottery.sol:4:1: ParserError: Sourc
I have a Python script using Brownie that occasionally triggers a swap on Uniswap by sending a transaction to Optimism Network. It worked well for a few days (d
I am new to block chain. Suddenly I got a question did we can able to access the previous block data from the Ethereum block chain by block number. For example
I have tried to make a ERC20 token that takes a transaction fee on every transaction (buy/sell/transfer) and this transaction fee gets distributed amongst the h
I need to send ether from externally owned account to contract. All code I found so far looks like this contract Contract { mapping (address => uint) ba
I want to get the value that is inside of struct in Solidity, but I have no idea how to get it. pragma solidity >=0.4.21 <0.6.0; contract PlaceList {
I'm learning blockchain development recently and I'm implementing ERC721 contract to mint NFT and store the mapping of ownership. What if I deploy a second cont
I am learning solidity and got to know that interface and abstract are both classes that may contain unused functions. My doubt is: What is the difference betwe
I'm trying to get the price of some BSC token directly from the contract. Doing some searches, I found a mix of ideas with the snippet below. I'm sure the code
I created an array of structures and then tried to get the values of each account of an array. But I failed with an array while passing the address variable whi
I have locally created a DApp in Solidity for Ethereum framework. I have a smart contract, a js file (using web3 API) and html file. What I want to achieve is t
I want to compile my ethereum HelloWorld.sol smart contract. In all the tutorials is that you do it like this: var solc = require('solc'); var compiledContract
I write the code below. It seems it has a problem with the "signed_txn = w3.eth.account.sign_transaction(transaction, private_key=private_key" part. I face to t
Is it possible to return an array in solidity? // SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; pragma experimental ABIEncoderV2; contract
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