Questions tagged [nft]

Questions about NFTs, non-fungible tokens.

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Best Way To Create An NFT Marketplace Payment Gateway

I am looking to create an NFT martketplace. I do not need any direction regarding a smart contract and minting ERC-721's. I've already created and am able to deploy that on a local blockchain. What I'...
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15 views

How is the ERC721TokenReceiver.onERC721Received data parameter used in practice?

The ERC-721 and ERC-1155 NFT standards’ safeTransferFrom functions both accept a bytes data parameter which is then passed on unaltered to the transfer recipient address if this is a smart contract. ...
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16 views

Why does this stuck transaction not appear on etherscan?

Can anyone help? I have a stuck transaction in my Coinbase Wallet. Its status is marked as "Pending", and this has been the case for about 10 days now. After doing some research, I've ...
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NFT wallet transfer pending on ETH but succeeded on Matic?

Wondering if anyone can advise me on the below... I transferred inventory from my Matic wallet to my Ethereum wallet on Arkane Network. There were two separate NFT's and the Matic transaction history ...
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14 views

approve + safeTransferFrom ERC721 from existing smart contract

I am trying to call ERC721 from another smart contract, while calling function approveAndTransfer ,I am getting "ERC721: transfer caller is not owner nor approved", not sure reason behind it,...
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Why does listing NFTs cost more than bidding on NFTs?

In the link below are current gas fees for doing contract interactions on two popular NFT platforms https://gas.metasync.app/ Why does it cost so much more to list an NFT for sale ($150) than it ...
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1answer
17 views

Get token standard type knowing the contract address and tokenId

How can I implement code that returns whether a token is in the ERC721 or ERC1155 standard, knowing both the contract address and the tokenId? What I tried is that I call a function that exists only ...
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1answer
14 views

Can ERC721Enumerable.sol provide an address's total set of NFT assets?

Intro: I am trying to use ERC721Enumerable in my NFT contract so I can get the set of all NFTs owned by a particular address. Research: The ERC721Enumerable contract was implemented to enumerate ...
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137 views

Enable a download only for an NFT holder?

Could someone enable a download only for an NFT holder? What would be the mechanism for this?
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13 views

Get quick access to assets, events

How do sites like Opensea get all their data so fast? Because getting the data from the blockchain and fetching the tokenURi's takes a lot of time. So I thought they might store all the assets, events,...
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1answer
16 views

ParserError: while parsing a block mapping

This is the code in my brownie.config.yaml file: # exclude SafeMath when calculating test coverage # https://eth-brownie.readthedocs.io/en/v1.10.3/config.html#exclude_paths reports: ...
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1answer
14 views

How Can I Add Functionality to my ERC 1155 Token? (If needed) [closed]

I'd like to create my ERC1155 token to start my crowdsale, but I also want the token to be utilized on my music web app. Allowing for artists to craft their own nfts or buy/sell from each other with ...
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69 views

What is the best way to handle multiple NFTs of the same collection in ERC1155?

I'm learning ERC1155, and I'm a bit confused. This is OpenZeppelin's example of an ERC1155 Contract: They state that Thor's Hammer is an NFT (because only 1 was minted), while Gold is Fungible. ...
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9 views

What are holdings of a Contract?

When I check an NFT on eterscan.io I'm seeing that that contract has many holdings. I think that these are total ERC20 transfers that put in the contract. Probably from NFT consumers like Opensea or ...
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20 views

Is ERC1155 an overkill if all NFTs are going to be unique?

Within the use-case I'm trying to define an ERC1155 for, I do not foresee to use duplicates for the same token. However, I would like to be able to have this option if such a necessity arises. Is ...
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1answer
33 views

Why are all NFTs created from Null Address on Opensea?

When someone mints on NFT on OpenSea using their own wallet as the identity of the creator, why does Null Address always appear in the NFT's transaction history as the creator instead? and then the ...
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2answers
32 views

How would i create a NFT smart contract that pays the artist & the consultant 10% of the sale price? [closed]

I am new to programming; learning & doing at the same time, so please bear with me.
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1answer
30 views

KeyError: 'wallets'

Screenshot of directory: This is the code in my brownie.config.yaml file: reports: exclude_contracts: - SafeMath dependencies: - smartcontractkit/chainlink-brownie-contracts@1.0.2 - ...
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17 views

NFTs with fractionalized ownership and royalties in perpetuity

Is it possible to code an NFT-compliant smart contract which has the following properties? There are multiple owners instead of just one Royalties are paid out to all owners in perpetuity, across all ...
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1answer
30 views

How to find all ERC721 compliant NFTs owned by an address? (Web3 JS)

It is possible to check which address owns a particular NFT by using the ERC721 standard function: function ownerOf(uint256 tokenId) public view virtual override returns (address) in ERC721.sol But I ...
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1answer
24 views

Fetching token metadata from token URI

Is there an efficient way to get the metadatas of a list of token uri's? Like, what if I have a list of 50 token Uris, would the only way be to send a different get request to each url?
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38 views

Is Unlockable Content in a gifted Opensea NFT safe to open?

If a 10 of 10 edition NFT is sent as a gift to your, and several other peoples', wallets on OpenSea (a custom token engineered by the issuer, and not a well-known NFT platform's token class), is it ...
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1answer
27 views

NFT's environmental/computational cost breakdown?

I've read the NFT and mining documentation on the Ethereum website, and I can't wrap my head around two things. If NFT's are not equivalent to Ethereum coins and therefore do not require solving hash ...
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1answer
17 views

How NFT image assets are combined?

How do NFT projects combine their assets with all possible combinations? e.g. Cryptokitties: you have like 10 skin colors, 10 eyes shape ...etc. to combine these assets, you get let's say 10000 ...
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126 views

What is Lazy Minting in Ethereum?

I am trying to create NFTs in various digital/crypto marketplaces like OpenSea, Rarible, etc for the past few weeks. In most of the sites, we need to pay some gas fees for adding an asset and creating ...
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1answer
27 views

How to find the IPFS address of an NFT on SuperRare?

The link to an NFT on SuperRare, an Ethereum-based NFT platform, is shown below. How can I find the IPFS address of the .mp4 file and view the video stand-alone? https://superrare.co/artwork-v2/the-...
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11 views

Is IPFS mandatory for NFT

Is it mandatory to use IPFS for file storage and use its hash in metadata for NFT, What if file is stored on s3 and we save its sha256 or md5 in metadata? Hash will be same until file content is ditto,...
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tokenByIndex method don't work for contract, how could I get Token Id

I use opensea.io for create nft tokens. I want create 100 tokens and then create redeem mechanism on my site (allow download music). I created contract using: "?enable_supply=true" https://...
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47 views

Get NFT owner by contract & token Id

I am trying to get the owner of a NFT in solidity & web3 by calling the Contract and the token id In Web3.js-v1.3.5 I've tried this so far, but the result isn't ever calledBack! How can I handle ...
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13 views

Selling NFT's, buyer calls minting function, how to call transfer function?

I'm implementing a dApp to sell NFT's. I want the buyer to call the function on my smart contract to mint the NFT so that they pay for the gas fees. However it seems like they can't then transfer that ...
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8 views

Event for nft sold on other platforms

It would be great if anyone could help me out. I am creating an auction website for bidding NFTs. I am stuck at a point where I need to know whether the nft on auction is sold on some other platforms ...
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30 views

Listing NFT on OpenSea via JS API: Failed to extract transfer calldata Error 400

I am trying to use the OpenSea JavaScript API in order to list NFTs for sale automatically. I can't seem to figure out why I keep getting the error Error: API Error 400: ['Failed to extract transfer ...
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9 views

How can we track creator of nft

Hi I'm sorry is there a way to easily track the creator of the nft? Because if it is not possible, then how could I know the nft is genuine and not a copy thank you
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30 views

NFT Id using erc-1155

I am bit confused regarding NFT implementation usng ERC-1155 because of newbie in NFT, by defination, there can be one instance of one NFT, there is one uuid per artwork. But in ERC-1155, I can set X ...
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27 views

Does unlocking content alter an NFT?

I bought an NFT on Rarible that includes unlockable content. If I unlock the content, will it alter the NFT? If I sell the NFT will the next owner be able to unlock the content? In summary, will ...
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10 views

Minting tokens that cover client's Tx fees and can only be used to interact with 1 smart contract [duplicate]

I'm working on a voting application. Is there a way to centrally mint tokens, hand them out to eligible voters/addresses, and only let users with this token vote? If so, can this token cover the ...
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14 views

Buyer sends ether to seller address in exchange for NFT (ERC-721) minted by seller

The scenario is that the contract has been deployed to the blockchain and the NFT is minted. Two questions: how do you implement in solidity the ability to give ownership of the NFT to the buyer in ...
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41 views

How to make buyer of my NFT pay the gas fee for minting?

I want to set up a dApp where i sell create and sell my own NFT's. Is it possible to put the gas fee's onto the buyer so they pay for all the gas? And how would i do that if so?
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Re-entrancy attack explanation and possible fix for specific NFT token - hashmasks

One popular recent NFT project - Hashmasks - Tweeted that some coder called 'samczsun' uncovered a possible re-entrancy attack in their mint function which would have allowed to mint more than the ...
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26 views

contract to mint tokens on Rarible

Is it possible that we have a contract that allows the user to mint contracts directly on rarible. If so, please guide how will this be accomplished. I want to mint erc-721 and erc-1155 tokens.
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34 views

Truffle migrations error: Transaction was not mined within 750 seconds, please make sure your transaction was properly sent

My env Truffle v5.3.1 (core: 5.3.1) Solidity - ^0.8.0 (solc-js) Node v15.11.0 Web3.js v1.3.5 my truffle-config file const HDWalletProvider = require('@truffle/hdwallet-provider'); require('dotenv')....
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1answer
37 views

How to fractionalize ownership of a collection of NFTs across multiple investors?

An Ether wallet contains a large collection of ERC-721 NFTs. Normally only one owner knows the seed phrase for a wallet and therefore is the owner of all the NFTs inside the wallet. How can such a ...
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19 views

What happens when you 'create' an item on the OpenSea app?

Very noobie here. I'm sorry, Does anybody know what happens on OpenSea when you actually CREATE an item? I know it doesn't mint one but what it does? (As it signs a transaction tho). I've been trying ...
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39 views

Import NFTs data from Metamask

Goal: Sign in to the server with Metamask (done), import information to the server about NFTs from a wallet (not done) to our platform (trading platform similar to Opensea). Problem: Metamask uses ...
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29 views

What are the factors involved in NFT gas consumption?

After reading this article ("The Unreasonable Ecological Cost of #CryptoArt" Part 1, Part 2), I'm keen to better understand what are the factors involved in energy consumption by NFTs. The ...
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27 views

How come I could spend 1.5 WETH, even though I only wrapped 1 ETH?

On opensea, I converted (wrapped) 1 ETH to 1 WETH, which is equal to 2 x 0.5 WETH = 1 WETH. I then spent 0.5 WETH on 3 items = 1.5 WETH, which is greater than the amount I had. how is this even ...
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29 views

How does one prove NFT ownership? [duplicate]

I've been hearing a lot about nft and I understand some fundamentals, though I am not 100% clear how would one prove ownership of an NFT token. Does proving NFT ownership requires to pay gas fees?
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1answer
42 views

How to effectively use the metadata of ERC721

When you store a URL as the metadata of ERC721, does that defeat the purpose of the immutability aspect of a blockchain, since the content that URL is pointing to can be modified? How do I effectively ...
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1answer
14 views

What is the significance of the function keccak256(abi.encode(to, ids))

I have seen a Solidity smart contract made by Polkamon, which is used to store NFT hashes, so that users can create an NFT without minting it, so that they can save Gas fees if they don't like their ...
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45 views

Why BSC is used more in DeFi apps? [closed]

I decided to deploy my NFT collectibles in BSC (Binance Smart Chain) because of Gas Prices in Ethereum blockchain. So, I researched some Dapps deployed in BSC. I've found that most of the applications ...