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Questions tagged [non-fungible-tokens]

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Can an NFT (e.g. ERC721) simultaneously belong to two different entities, say an user Owner, as well as a user Custodian?

For example, on the blockchain say you own a ERC721 Car token at your wallet address, but you want to park it in the ERC998ERC721 top down composable Garage owned by your friend, while still retaining ...
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1answer
25 views

Using NFT paired to credentials for identity verification

I have a question on the feasibility of pairing a non fungible token (NFT) with credentials for identity verification on the Ethereum blockchain. Can we imagine a scenario where a user would have a ...
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1answer
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ERC-721 - How to avoid that an updatable tokenURI becomes a vulnerability for token trust?

I understand that one can use the tokenURI field to add the address for an endpoint that returns meta data for the given token. Let's imagine we create a unique asset with tokenId = "1" tokenURI = "...
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3answers
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Using a Non-Fungible token to gain access to a file

Please excuse me, I'm a layperson, not a programmer. At this time is there a way to issue NFT's to be used as a 'key' to gain access to a file on the internet? For example you create and sell an NFT ...
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1answer
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Can we send tokens with data input? [duplicate]

Can we send tokens with data input? I did a bit of research on erc20 but maybe this is quite complicated. Will erc 721 do this?
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2answers
133 views

How to guarantee IPFS file access based on Non Fungible Token ownership (or security)?

The file is too big to be stored on the blockchain, so it is stored on IPFS. Only the person who owns a unique Non Fungible Token (or a Security Token) can access it. Of course I can encrypt the file ...
1
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1answer
90 views

ERC721: Interface ID Registration

Why we need to register Interface ID in ERC721 token. I was just going through the openzeppelin-solidity erc721 code and curious to know that why we need to use this. That interface id register code ...
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2answers
76 views

Splitting and Merging tokens

i'm here to ask if my project is doable or not. I'm actually reading "Mastering Ethereum" by Andreas M. Antonopoulos, so i have some basic solidity knowledge. I have a project: I have a building, ...
1
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1answer
34 views

add fields to ERC721 tokens, still belongs to the standard?

if starting from the code of an erc721 token, I add fields beside the name, symbol and URI, is it still a token that respects the standard? Add in the contract, not in the JSON file. The most ...
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1answer
119 views

ERC721-OpenZeppelin: This contract does not implement all functions and thus cannot be created

I know there are already a lot of topics that deal with the problem but their solutions didn't work for me. this is the code: pragma solidity ^0.5.2; import "https://github.com/OpenZeppelin/...
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2answers
21 views

Create token with address and fields

I would like to know if it is possible to create tokens that have a different address or id for each one. I need to create a series of "objects" with the same structure but with the values of ...
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1answer
83 views

STO using Ethereum

Is anyone here worked on STO using various ERC protocols. Need to get some information about it. Regards, Divansh
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3answers
335 views

ERC721 - Create 1000 tokens in one function call

I have implemented a contract where a set of ERC721 tokens should be generated with a function call in private net. Code as follows : function mint( address _owner, uint256[] _id ) ...
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1answer
265 views

How to ERC721 token using external contract to msg.sender?

I have Caller and ERC721 contract just like this : contract SampleToken is ERC721MetadataMintable { string private name; string private symbol; constructor (address _creator, string _name,...
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2answers
183 views

Ethereum implementation of a non-fungible but divisible token? (ERC721 seems not to work for that)

I am struggling currently with finding the right implementation possibility for a token with the following properties: Asset-backed token based on a non-fungible asset (like a piece of art) More than ...
1
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1answer
299 views

Two ERC721 tokens that refer to the same metadata

This is a question about the ERC721 interface. I understand that the tokens are non-fungible and guaranteed to be unique to a specific account (owner). One possible way to use ERC721 tokens would be ...
4
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1answer
783 views

mint method usage in ERC721 token implementation

What does the internal method call _mint(msg.sender, tokenId) really do in the background when used with ERC721 token implementation?
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1answer
66 views

Meaning of “fungibility” in “Zerocash (Zcash)”? [closed]

According to the following article, Zcash provide a high level of "fungibility". compared to other crypto-currencies. Article link: https://www.investopedia.com/terms/z/zcash.asp fungibility ...
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2answers
763 views

ERC725 with ERC735 - Identity and Claims

How does ERC725 (Identity) and ERC735 (Claims) work together to enable a decentralized identity?