I understand why it's important that all nodes on the Ethereum mainnet must execute any smart contract function call which changes the internal state of the con
I'm trying to learn how to create NFTs on the Ethereum block chain. In terminal (Ubuntu 20.04.3 LTS) Aki-Zeta:~/my-nft$ node scripts/mint-nft.js I keep getting
I am trying to deploy my SimpleStorage.sol contract to a ganache local chain by making a transaction using python. It seems to have trouble connecting to the ch
Problem I am trying so use a method of a contract in the testnetwork (ropsten), but it fails due to this error: reason: 'cannot estimate gas; transaction may f
I am trying to perform a certain action say like selling a token only when the message sent to a contract is signed by the contract owner. I knew how I would do
I would like to verify an ethereum (ETH) signature made in MetaMask using python. I'm developing a website using flask as backend. Javascript code send a POST r
If a smart contract has the compiled bytecode for a contract can the first deploy a subsequent contract? According to Ethereum.org: "To deploy a smart contract,
Solifity 0.8.0 with struct struct Placeholder{ string a; uint256 b; } mapping(uint256 => Placeholder[]) public placeholder; why this error Member "b" no
Basically I am running these commands: var blocknumber = await web3.eth.getBlockNumber(); var transaction = await web3.eth.getTransactionFromBlock(blocknumber,
I installed py-solc-x via pip3 install py-solc-x in the terminal but when I run the program, I still get an importerror. What's going on here? My code: from sol
I'm trying to create my own NFT contract factory, but it fails in mainnet. I have ETH on my wallet. In test it works fine. Here's my contract: //Contract based
I am getting this error message when trying to interact with my smart contract on my react front end. I am running localhost3000 and which requires metamask to
I am not really sure how to restart the state of the node to the initial state. Each time I try to redeploy a contract - I'm getting the same contract, the cons
While trying to troubleshoot another issue with my project, I must've broken something along the way, but I have no idea how to fix this. These are my import st
I have a new Erc20 token built on Polygon network and available on Polyscan, how can I make it available on Binance smart chain as well, the same way like other
When creating a ERC721 contract that manages thousands of image NFTs, saving these image byte pixels in arrays on the contract doesn't seem ve
When creating a ERC721 contract that manages thousands of image NFTs, saving these image byte pixels in arrays on the contract doesn't seem ve
I have BSC node synced and running on VPC ( the VM specs are 120G RAM and 24vCPU with nvme of 4 tera) it synced pretty fast and using geth version 1.1.2 I teste
I use Quasar CLI version 1.2.1 and library web3 version ^1.5.2 it's an error when i use: import Web3 from 'web3' Log Error: App • Chaining "UI" Webpack c
I'm trying to import some contract files from open zeppelin so my solidity smart contracts can inherit their functionality, when trying to write chai tests that