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Questions tagged [erc721]

123 questions
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why and when is setApprovalForAll called?

I'm having a hard time understanding why and when SetApprovalForAll is called on NFT generating contracts. Take Cool Cats, for example. And for convenience there's a screen shot of relevant transactions, below. I've noticed that for this contract…
Doug P
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set token URI function

I understood that setTokenURI function isn't in use anymore. How can I change the token URI of the NFT token I want to create? for now my function createCollectible inside the smart contract looks like this: function createCollectible(string memory…
OmerS
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Internal JSON-RPC error with MetaMask on Polygon Blockchain. `ERC721: transfer caller is not owner nor approved.`

I am making an NFT marketplace. When I deployed my contract on the Mumbai-testnet. The createToken function might work cause it brings up the Metamask for the Gas Fee but after that, the Error occurs something regarding the ONWNERSHIP. (Error image…
Megabyte
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How to check if transaction is NFT using Web3j?

I'm using Web3j library to work with the blockchain. I want to resolve what tokens are transferred during specific transactions. What I have already tried: Call Function with the name supportsInterface to check whether it supports NFT standards…
wollenS
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Transferring ERC721 Tokens using Python/Web3.py

I can not for the life of me find any article on the entire interweb that talks about using web3.py to transfer ERC-721 tokens between wallets. Minting, yes all day long, airdrop yes all day long, but wallet to wallet transfer, nope. Am I missing…
donny90210
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Gas efficiency of totalSupply() vs. a tokenID counter | ERC-721

I'm creating a solidity contract for an NFT and in my mint function I'm not sure if a call to totalSupply() vs using a token counter and incrementing it is better practice. Does either variation cost more gas? Is one the more standard practice? I've…
degenTy
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Hardhat issue UNPREDICTABLE_GAS_LIMIT in a script within ethereum development of ERC-721

I have a problem that I really despair of and I think it has maybe to do with an "wait for confirmation?" issue, but I don't know how to activate this. Issue is, that I get as result of an request against a function of my ERC-721 contract following…
Airwave
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Goerli ValueError: Gas estimation failed: 'execution reverted'

I'm trying to deploy an NFT about Harry Potter following this tutorial: https://www.youtube.com/watch?v=p36tXHX1JD8&list=PLzmffB-8Vx5Twi0x5cRRdzyixrkJtaftJ&index=9&t=3s. But when I run create_collectible.py I have an error: ValueError: Gas…
PIER FRANCESCO
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How to check whether user has any ERC1155 of specific contract in solidity?

I'm writing a staking smart-contract for ERC1155 contract (https://etherscan.io/address/0x2013ff029f9d3d31169f4fdc673c8b9fa0ce1fbd#code). When user wants to claim his reward, I need to check whether he owns any token of another ERC721 contract…
GorgeousPuree
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What is the purpose of symbol and name in ERC721?

I'm new to ERC721 and have some question on it. I was following some tutorial and have question on constructor. The question parts are below. constructor(string memory baseURI) ERC721("NFT Collectible", "NFTC") { setBaseURI(baseURI); } I…
Alchemist
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Staking multiple ERC721 NFTs at once

I have an ERC721NFT contract/collection that is already deployed. I am asked to stake them which i did by creating a new contract and implementing the onErc721Receive function. So far so good. If you send a NFT from the right collection it…
Torof
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How to call _mint() on erc721 without emit Transfer

I've read here that it is possible to mint 2^256 nfts in a single transaction. I've tried to achieve this by directly assigning _owners and _balances mappings but ofc these are private variables so i can't change them. I tried making an _mint()…
Eduardo Robles
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What is type (like "object") in ERC721 Metadata JSON schema

According to the standard, there's a type such as "object" shown below. What is this type for and what other types can we use? Can I use like "art?" { "title": "Asset Metadata", "type": "object", "properties": { "name": { …
vagef53574
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How to mint / transfer ERC1155 token to ERC6551 token bound address of ERC721 directly after mint?

Say I have a smart contract for an ERC721 NFT collection (a), an ERC6551 smart contract that deploys a token bound account for these NFTS (b), and a contract for ERC1155 tokens (c). Here's what I want to accomplish: Upon mint the user receives 1…
Gandarufu
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Receiving a DeclarationError: Identifier not found or not unique while using counters using Remix

I am trying to run the code which is generating an error stating that DeclarationError: Identifier not found or not unique. The smart contract NFTCollection is a solidity code which enables me to mint a specific number of ERC721 Tokens and to count…
andhra bullodu
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