I am discovering the blockchain world step by step, but I am facing a problem that I can't solve. I am using this simple smart contract from the Solidity docume
Smart contract execution needs gas fee. So all data can't be stored in blockchain. Images could be stored on ipfs like Pinata. Do I have to develop extra backen
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
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'm using node version 12.20.2 and npm version 6.14.11 and installed truffle with cmd as administrator, the truffle framework version 5.5.12 has been installed
I am looking to grab historical data from our Solana Devnet feeds. Can you let me know if get_submissions is the function that should be called for historical d
I get this error where I run anchor deploy: Deploying workspace: http://127.0.0.1:8899 Upgrade authority: /home/<user>/.config/solana/id.json Deploying pr
2_deploy_contracts.js ===================== Replacing 'SimpleStorage' ------------------------- Error [ERR_UNHANDLED_ERROR]: Unhandled error. ({ code:
I playing Ethernaut Level 8. The goal is to get access to the private password state variable and unlock the contract. I know one could use await contract.unloc
I am a newbie in smart contract development. I just create a smart contract for some analyze how it works, so I used the truffle suite with vs code to create a
I am a newbie in the blockchain technology and I have question. I just deployed an Ethereum smart contract to the Rinkeby testnet network and minted a few NFTs.
I need to deploy my smart contract to BSC Testnet I always got this : Error: PollingBlockTracker - encountered an error while attempting to update latest block:
I want to make a game in a Scrypto blueprint where users can play with their Gumball NFTs. My blueprint has a pub fn attack(&self, my_gumball: Proof, other_
How can we generate random numbers in Scrypto if floating point libraries are not allowed be used? I want to be able to generate unique IDs for NFTs.
I am trying to do the following calculation with solidity: 3,000 / 45,000,000 = 0.000067 with the following method: // SPDX-License-Identifier: MIT pragma solid
This is my first experience writing a smart contract, so I am still trying to navigate how this all works. I have a smart contract on the Rinkeby test network t
I'm writig a dApp using web3Modal and web3js libraries. I have an issue regarding the WalletConnect provider. Upon choosing to connect using WalletConnect, the
I am trying to call Uniswap's Router's function swapExactTokensForETHSupportingFeeOnTransferTokens(). When I enter the values manually on etherscan, it goes thr
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