Questions tagged [meta-data]

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How to avoid user to get metadata from non-minted ERC721 token?

I'm building ERC721 and ERC1155 tokens but I have something I didn't understand.. My Tokens represent characters with attributes, where every attributes have a different rarity. So every character are ...
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1answer
266 views

Metadata not showing up for ERC-721 OpenSea NFT

I made NFT's, following this tutorial I deployed the smart contract via Remix to my Metamask on the Rinkeby Testnet. OpenSea detected the assets in my wallet after they were minted, but the pictures ...
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1answer
33 views

I minted an NFT using an interface I created but the media (image) is not showing up on opensea

I minted an NFT. This is the metadata - https://bafybeictwd4bz4aof7gfl7mkdmzdqfgdpwijuvvrun6ytr7sqvgrd6p4oi.ipfs.infura-ipfs.io/ But the image is not showing up on opensea - https://opensea.io/assets/...
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1answer
76 views

Updatable attributes for ERC721 Tokens without touching to immutable rarity attributes

I'm trying to implement an ERC721 smart contract with some NonFungible token. Some attribute will never change, about "layout/traits" composition, and others will evolve like XP. Immutable ...
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28 views

User side metadata reveals for ERC-721 tokens

I'm helping a friend create a project where the project slowly mints and reveals over time. What's the best way to ensure no metadata is leaked? Here's how it'll work user mints a NFT, user calls a ...
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1answer
952 views

Updated token metadata not refreshing on OpenSea

I've deployed a contract that lets users mint NFTs, which will have a "coming soon" artwork that will then be updated to reveal the real artwork at a later time. This was due to the fact ...
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1answer
9 views

Capture Token Metadata for Newly Created ERC-721 Contracts

I feel this shouldn't be a super difficult task, but I may be underestimating it. If anyone could put me on the right path to begin, I should be able to take it from there. The part that is confusing ...
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49 views

How to get NFT metadata from marketplace

I am looking for something that interacts with an NFT marketplace.(like https://marketplace.axieinfinity.com/axie/) I want something that will check this NFT marketplace and when it finds one within a ...
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1answer
59 views

How to prove the NFT metadata were written by the issuer?

I would like to ask a question a little bit similar to How exactly can someone prove they were the creator of an NFT? In this scenario, the NFT is already minted. According to the description of the ...
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1answer
562 views

Reveal NFT metadata after buy

We would like to publish our collection on OpenSea, the artwork is done, and would like to do so using Haslips' smart contract. This smart contract already has a similar thing that we are looking for, ...
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20 views

Two metadata hashes at the end of the bytecoe

doing my own research i saw that the metadata hash is added to the end of the bytecode and i can extract and decode it with cbor. I know that we can identify them by different ways, in this case with ...
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87 views

Token URI not found on Opensea

I ran brownie run scripts/rizer_incept/set_tokenuri.py --network rinkeby and I got this error TransactionError: Tx dropped without known replacement: ...
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1answer
151 views

Properly parse contract creation bytecode metadata hash using cbor module in npm

I 'd like to build a smart contract verification service like etherscan. While trying some verfication test on etherscan, I get to know that deployed contract blockchain bytecode differs from ...
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1answer
60 views

MIgrate a NFT to IPFS after minting?

Hi I would like to know if it is possible to migrate my NFT from a standard webserver to IPFS after minting it? I already generated and minted my NFTs and now I would like to call the basetokeURI and ...
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28 views

Doesn't token metadata used in NFT digital art negate the whole blockchain idea?

I'm new to blockchain/Etherium/NFTs, and I was shocked to learn how NFT tokens that represent digital art are actually implemented. Instead of the blockchain enforcing the integrity of the image data ...
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94 views

How does Opensea fetch Cryptokitties' metadata?

As far as know CryptoKitties doesn't have metadatas on blockchain, they generating images from kitty's genes. Am I right? But here is the real question: If they don't have metadata on blockchain how ...
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1answer
585 views

How to fix "Unidentified Contract" on metamask NFT viewer

I've deployed a few ERC721s to ethereum and polygon, but they all show as "Unidentified Contract" in the mobile metamask nft tab. I feel dumb for not being able to figure out why - any ...
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75 views

NFT collection smart contract - attributes on opensea

I have a question regarding attributes in tokenUri.. I know to display attributes on item page, we can add attributes array to the tokenUri.. but if I look at the contract of THE LOOT or THE N PROJECT,...
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1answer
972 views

ERC721 Metadata - TokenURI - Return the full JSON String Instead of URL Pointer?

Sorry if this is hella n00b, but I was wondering when overriding tokenURI you can just return a string containing all the metadata which is calculated dynamically on-chain, eliminating the need for ...
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30 views

ERC-721 metadata encrypted: how to deal with the transfer of ownership

I'm struggling with the following problem: I want a ERC-721 with some metadata encrypted so that only the owner can access it. The issue is: at the time of transfer, how can the metadata be encrypt ...
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1answer
2k views

How do I access/read the metadata from my Opensea NFT purchase?

I have recently purchased an NFT on Opensea: https://opensea.io/assets/0x495f947276749ce646f68ac8c248420045cb7b5e/35392070563509681805150427162397186746015806770332227833352734069616516530177 I am ...
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1answer
40 views

How are ERC 721 metadata secured?

If erc721 tokens store the metadata off chain, how is that information secured? If I mint a jpeg as an NFT, using erc721, and the uri just points Tia file, how is that file secured? What prevents ...
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102 views

Retrieving contracts metadata given swarm hash file

How can I retrieve the contract's metadata referred by Swarm Source at Etherscan page for this contract? https://etherscan.io/address/0x1f9840a85d5af5bf1d1762f925bdaddc4201f984#code It says the bzzr://...
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359 views

How to read in and use metadata via a smart contract?

Is there a tutorial for beginners on how to read metadata via a smart contract? I can't seem to find out how to do this. What I want to do is a simple proof of concept: Example mint NFT-A metadata ...