I wrote a solidity that pays ERC-20 tokens for ERC-721 NFT transactions, but it doesn't work. On purchase, you trigger the purchaseToken method. But I get an un
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 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'm writing an ERC721A smart contract and getting a warning in the Remix IDE. There is the code: function tokenOfOwnerByIndex(address owner, uint256 index) pub
I'm trying to build out this tutorial, but I keep getting the same error when I try to import from a solidity file to a python script and run it, all in the sam