Questions tagged [erc721]
123 questions
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Block OpenSea trading
Is there a way to avoid trading NFTs on standard marketplaces like OpenSea without breaking the erc721 standard?
If so, how would you go about it?
It is about an NFT that is something like a voucher that can be used 5 times. Over 5 years, once per…
SLTN98
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I want to mint and transfer 1 erc20(custom) to the minter itself, just to track erc20 transaction
This is the code used, I am using polygon testnet for testing, the approve function is working fine but transferFrom is not working(error: -32000)
// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;
import…
Aditya Raj
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Compiling an ERC721URIStorage contract
This question is essentially a follow-up to this question. I have been trying to follow Alchemy documentation to create an NFT contract but encountered the need (as described in the linked question) to import ERC721URIStorage. However, I now get a…
N. Mao
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SetApprovalForAll: not owner nor approved
Hello to everyone i have a problem in my contracts and i don't understand how to solve it...Is a Nft Marketplace, and the problem happen on the second sale, i mean if i mint a token, then import the token in the markeplace and sell it from A to B is…
Matteo Gigli
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1 answer
Can I connect solidity contract with backend Node.js
I am a beginner, Can anyone please guide me that how can I connect my smart contract (erc721) with node.js. Please guide through steps or links. Thanks a lot.
Zoha Akram
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1 answer
Privilege for a list of addresses
I want to give free mints to people who owns an NFT from another collection. I can do it through importing interface of another contract and calling the balanceOf function with the related address, but when I do that, people can transfer their NFTs…
Molly Hatchet
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Migrate my users ERC1155 tokens to ERC721
I have my ERC1155 token contract deployed on Ethereum network
i want my token holders to make the token to 721 standard and burn the old tokens
how can i achieve that using a proxy contract
need some proper direction on this , thanks
So looking to…
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2 answers
How are ERC 721 based DAO created?
I am trying to create a NFT DAO, ERC 721 based after ERC 721 vote feature came in recently. Tally is the only tool allowing for that. But I wanted to try and experience traditional DAO creation first.
So I have been trying my hands on to create a…
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1 answer
Unable to do transaction -ERC 721
I'm unable to complete transaction for ERC 721 using Metamask with polygon.this error message is shown when i tryto transact.i'm using this contract.https://github.com/HashLips/solidity_smart_contracts/blob/main/contracts/NFT/NFT.sol
Gas estimation…
user18023742
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1 answer
Smart Contract NFT how to add price by code to whole items in collection?
Greeting,
Could you tell me how to add price for every item in collection hosted by OpenSea ?
So, I have working code, It created:
1.Collection name (from construct before deploy)
2.NFT symbol (from construct before deploy)
3.URI to ipfs (from…
indover
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ERC721 Minted NFT not showing on Opensea.io testnet
I run my code on rinkeby etherscan network and it works perfectly. But the image and descriptions are not showing on opensea testnet. I run the /validate/ url it shows Valid: "false".
Here is what I found when I force update on opensea,…
Abimbola Salawu
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1 answer
can't import module from solidity file to python file in brownie; ImportError: cannot import name 'AdvancedCollectible' from 'brownie'
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 same environment via brownie.
I'm using this command in my local terminal:
'brownie run…
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Is it possible to tell if a transaction involves an ERC721 token if the only information you have is the transaction address from Ethereum blockchain?
Right now I have a web socket that's subscribed to all pending transactions. I was wondering if I'm able to figure out if I'm able to decide if a particular transaction involves an ERC721 token with the object that gets returned.
I was looking into…
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2 answers
Create two different instances of ERC-721 in the same smart contract
So I want to create two different kind of NFTs, each one with its own name, but I don't want to create two different smart contracts and duplicate my code.
I don't know if its possible, but it is worth asking.
Sorry if it's an stupid…
brt88
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ERC721 with payable function
I writed a code enter link description here with payable function transfer.
but, after Deploy in the "etherscan" showed me that is is not erc721, it is ERC20. can help me? where is wrong?
