Questions tagged [nft]

Questions about NFTs, non-fungible tokens.

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What determines how much gas is required when transferring an ECR-721 non-fungible token? [duplicate]

When transferring an ECR-721 token, what determines how much gas is required? Is it written into the contract of the ECR-721 token? Does it depend upon how it was transferred (e.g. cryptokitties.com ...
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1answer
962 views

How to show erc721 NFT card images in compatible wallets?

I have created an NFT and now I want to add some metadata e.g card images, that shows in a compatible wallet like trust wallet. What step is needed next?
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2answers
3k views

Can't see my NFT image in Wallet

I just crated a NFT and deployed it on Rinkeby to test it. I'm able to add my NFTs to wallets but I don't see the image I provided when minted it. What could be the reason? The image was a small .png ...
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1answer
2k views

Updating ERC-721 Token's Metadata after it was Minted

Is it possible to somehow update an existing ERC-721 Token's MetaData after it was already minted? Let's say we've created a Knight character for a game - by minting an NFT for it, and 3 months later ...
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15 views

Can one ERC721 have two type NFT?

I am new to smart contract, I have to make NFTs so I am following ERC721 standard, but I have to make two types of NFT NFT1 = {prop1, prop2} NFT2 = {prop3, prop4} so can I have two type of createNFT ...
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109 views

Storing access to encrypted data in non-fungible tokens

I am fairly new to ethereum, I want to develop a non-fungible token that can grant access to its owner access to encrypted data on IPFS. The way I am thinking this can be done is, first the owner of ...
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2answers
28 views

Token Access Issue

Hi Sir we Create Token but we cloud'n have full access on Tokens. Like we create 2000M Token but when I add it in my Metamask I got only 200M Tokens. Cloud you please me out for this?
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1answer
643 views

Signing a message to sell NFT/token - what happens if you transfer the NFT later?

If you sign a message with intent to list an NFT/token for sale - how does that work if you transfer the item later? For example on an NFT marketplace - you list your NFT for sale by signing a message....
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2answers
44 views

Why do people even play CryptoKitties? [closed]

I've been lately trying to understand tokens in Ethereum, which basically makes me ponder ERC20 token standard... I still am very much confused in all of its concepts, but the main thing that I haven'...
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1answer
159 views

Which token standard should be use to create different tokens for different users?

I have read several differences between fungible and non fungible tokens. It cleared my few doubts though, I have few more remaining. I have requirement to create a platform on which users can ...
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0answers
32 views

Given just an Etheruem address, is there any way to tell if it's an ERC20 and/or an ERC721

If I have only an Ethereum address and only a locally running node (using a third party such as EtherScan or Alethio is cheating), is there any way to tell if that address is an ERC20 or an ERC721 ...
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1answer
177 views

When to use nonfungible tokens and possibility to interchange tokens with different standards

I'm little bit familiar with Blockchain and ERC-20 standard. Now I started learning about ERC-721 and having a lot of confusion. Let's take an example of music artist token platform. Any music ...
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2answers
366 views

ERC20 and/or ERC721

Consider the following scenario. A person owns a asset called "A". Now the asset is very high valued and unique but you can allow other persons to own a certain part of that asset. EDIT: Ownership ...
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3answers
965 views

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
621 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
112 views

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
1k views

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
332 views

How many projects are there which implement ERC1155 standard?

New ERC1155 standard which is thought to be an improved version of ERC721 and ERC20. But I see many projects still prefer ERC20 or ERC721 standards. If so, do you know any projects implementing ...
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1answer
109 views

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
906 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 ...
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1answer
500 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
224 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, ...
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1answer
96 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
254 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
29 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
99 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
1k 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
562 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
511 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 ...
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1answer
570 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 ...
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1answer
1k 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
81 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
1k views

ERC725 with ERC735 - Identity and Claims

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

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