Questions tagged [erc-721]
Relating to ERC-721, the standard for Non-Fungible Tokens (also known as Deeds)
166
questions
0
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3answers
24 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 ...
0
votes
1answer
23 views
Smart Contract overview ERC-20 instead of ERC-721
I have created ERC-721 standard but on etherscan (Ropsten) it's still showing ERC-20 standard in overview
Below are my contract code, please share your thought if I'm doing something wrong.
contract ...
0
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1answer
22 views
all erc 721 tokens being collectibles
Considering all NFTs are unique, are all erc 721 tokens collectibles? I'm asking this because on the Etherscan website some NFTs have the collectibles tag and some do not.
0
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1answer
31 views
Unable to invoke smart contract function from Web3j contract wrapper
I've been learning about interacting with smart contracts through Android and the Web3j framework but have run into an issue.
I'm trying to mint an ERC721 token and send it to an address but it doesn'...
0
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0answers
34 views
Api to get total transfer count of an ERC-721 Token
I want to retrieve the total number of an erc 721 token's transfers/ transactions. I couldn't scrape the transfers value from etherscan as well e.g. given here https://etherscan.io/token/...
2
votes
1answer
24 views
Confusion regarding total number of ERC-721 Tokens
I have two questions:
1) I want to retrieve the list of all ERC-721 tokens. The main block explorer for Ethereum which is Etherscan shows 2,883 ERC-721 tokens on its website https://etherscan.io/...
0
votes
1answer
19 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 = "...
2
votes
2answers
32 views
ERC standard: possible to set upper price limit for NFT?
Let's say I want to create a non-fungible token which represents a ticket to a venue. And I don't want ticket scalpers to buy tickets and resell these tickets for a higher price. It should only be ...
0
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3answers
34 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 ...
-1
votes
1answer
67 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 ...
0
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0answers
60 views
Solidity bytecode not generated despite no errors
When does a compiler fail to generate bytecode for solidity? The code compiles entirely but both remix and solc js give proper abi but empty bytecode. The contract imports ERC721.
Solidity contract:
...
0
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0answers
26 views
Cann't send token with looping function
Sorry, I'm a newbie on ERC721 token. Please help.
I have deployed ERC721 contract in the localhost testnet. I use looping function for mint token and it works.
But when I use looping function for ...
-1
votes
1answer
31 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?
0
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3answers
63 views
Self-destructing NFT (ERC-721) token [closed]
What I want to achieve is self-destructing token.
For example I'd like to have some updatable TTL value assigned to my token. If TTL is reached the token should be auto-burned.
What are the best ...
0
votes
1answer
31 views
Are there any good ways to express conditional ownership on ERC20 or ERC721 tokens?
I'm currently looking for any good ways to express conditional ownership on tokens.
I look into approve function of both ERC20/ERC721 but, it seems that function may be disapproved by the owner and ...
-2
votes
2answers
57 views
ERC721 - How to create many ERC721 tokens at a time
Is it possible to create many ERC721 tokens at a time?
I saw this link.
ERC721 - Create 1000 tokens in one function call
But I don't get it.
Please help me.
0
votes
2answers
93 views
gas required exceeds allowance when deploying ERC721token
I am trying to deploy Smart-contract(ERC721) on my private ethereum network.
But I have this issue.
Here is my genesis.
{
"config": {
"chainId": 3333,
"homesteadBlock": 1,
...
0
votes
0answers
23 views
ERC1410 Security Token
I am searching for an ERC1410 security token contract source code (must be tested) to implement in another contract, there is a github repo available but it is written in the beginning that the code ...
3
votes
1answer
122 views
Issue in ERC721 token transfer to contract address
I am using ERC721 implementation for NFT tokens.
I am testing the transfer functionalities in ERC721.
`transferFrom(address _from, address _to, uint256 _tokenId)`
`safeTransferFrom(address ...
2
votes
2answers
28 views
Is there a way to be notified when ERC721 is deposited?
We are coding a contract that will work with ERC721 tokens, basically a Plasma Root Chain contract. We need this contract to do some work whenever it receives a new ERC721 token from a ...
2
votes
2answers
174 views
ERC721 Token - Burn and mint again
I didn't try yet, but let's suppose the following:
I have an ERC721 contract token with a total Supply of 101
My contract can mint and burn
The first token has id 0 and the last one has id 100
I ...
2
votes
2answers
134 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
vote
1answer
103 views
Implementing ERC721 Marketplace
I'm working on a project where I need to implement an ERC721 marketplace. It doesn't work for some reason and wanted to know if I'm doing everything correctly.
The way I approached this was:
The ...
1
vote
1answer
50 views
ERC721TokenReceiver, assuming that transfer function exists?
When trying to find out if a contract implemented onERC721Received from safeTransferFrom function, are we just safely assuming the contract has all the erc721 related functionalities? such as transfer,...
1
vote
1answer
35 views
bytes data param in safeTransferFrom
In ERC721, safeTransferFrom has bytes data parameter.
function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) public;
how do I send data (is it in hex format?) and what ...
1
vote
1answer
28 views
What does mutability guarantees mean in erc721
Some functions from ERC-721 interface contain payable modifiers.
function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
I was wondering why it is payable and found ...
2
votes
1answer
30 views
Is there a reason why minting is excluded in erc721 interface?
So the EIP-721 standard says,
Creating of NFTs ("minting") and destruction NFTs ("burning") is not included in the specification. Your contract may implement these by other means.
interface ...
0
votes
1answer
51 views
others accessing setApprovalForAll ERC721
While I was skimming through open zeppelin's ERC721BasicToken.sol I came across a problem.
When setting the approval of a given operator
function setApprovalForAll(address _to, bool _approved) ...
0
votes
1answer
66 views
ERC721Enumeration: DeclarationError for tokenOfOwnerByIndex(address owner, uint256 index)
I am new to the smart contract and please let me know why I have the error shown below.
I compiled with the command, "truffle compile".
I did not make any particular edits to the original contract ...
0
votes
2answers
43 views
ERC721 exchange logic
I'm trying to allow NFT holders to sell their tokens by listing prices (ETH) and allow others to buy those listed tokens.
I used openzeppelin and succesfully implemented and tested my token creation. ...
0
votes
1answer
44 views
Create multiple tokens for a unique property
here is the idea:
we assign a set of unique tokens to a company and then we allow people to buy some tokens and get partial ownership of that company. How can I achieve this? I was thinking of ...
1
vote
1answer
44 views
ERC721 Metadata and Items
i'm new to ERC721 tokens so this may be a stupid question.
Following the Opensea docs and other docs (for example openzeppelin ones), I just create a simple ERC721 token that i called "avatar" which ...
1
vote
1answer
73 views
How to show inventory tab on etherscan
Sorry, i'm newbie about ERC-721. I have deployed my contract and verified it. https://ropsten.etherscan.io/address/0x677f76d276355c382da948d2476da06cf5dc6219
But I don't see inventory tabs like other ...
2
votes
1answer
67 views
What is the current distribution of ERC Token Standards in the top 100-1000 most active token contracts?
From ERC 677
Motivation
ERC20 requires a multistep process for tokens to be transferred to a contract. First approvemust be called on the token contract, enabling the contract to withdraw the ...
1
vote
1answer
82 views
Transfer erc721 token to another address
I'm currently using transferFrom / safeTransferFrom to transfer the token to another address but I encounter this error.
Error:
Error: invalid address (arg="to", coderType="address", value="...
1
vote
2answers
132 views
ERC721, Token name and symbol not shown in etherscan
I have created a simple token with ERC721, but etherscan not show my token name and symbol, why? this is my contract
I deploy with this code
Result on etherscan
No token name and symbol showed, is ...
0
votes
2answers
118 views
Why should I use an ERC-721 token to store data instead of a Smart Contract
Taking CryptoKitties as example, I'm sure it's possible to achieve the same concept of Crypto Collectable creating new kitties as Smart Contracts instead of using Tokens. Which would be the ...
2
votes
2answers
65 views
Is there a maximum/optimum amount of ERC-721 that can be issued per contract?
Take a role playing game as example in which players are allowed to create any number of characters (each one defined by an ERC-721 token). What would be the consequences of having more than 10 ...
1
vote
1answer
92 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 ...
0
votes
1answer
33 views
Can you add a link to a ERC-721
I would like to get your though about what would be the best way to encapsulate a document in the blockchain.
What i would like to achieve is that 1 token = 1 document, this token isn't divisible, and ...
0
votes
2answers
198 views
How do I send NFT assets (ERC721 Tokens) from my Ethereum wallet to someone else?
I want to send my ERC-721 to my friend. Fast. Any suggestions?
1
vote
1answer
60 views
ERC721Token super._mint calls addTokenTo from the top level implementation
Based on Shawn's answer,
super._mint calls addTokenTo from the top level implementation (ERC721Token).
How does this work?
super._mint calls _mint from ERC721BasicToken
reads line addTokenTo
...
1
vote
1answer
104 views
ERC721 how does tokenOfOwnerByIndex() list tokens owned by a user?
Per eip-721, there's an optional "enumeration extension". So what I did was I called balanceOf to get the number of tokens owned by the account and called tokenOfOwnerByIndex in a loop to get each ...
1
vote
1answer
24 views
Where can I find public and known ERC20-Contracts from existing ICOs
In order to list real live example code for ERC20-Token and Crowdsales at a talk about Smart Contracts I'm looking for such projects?
Who can recommend me the real GOOD examples out there (and not ...
1
vote
1answer
269 views
Store ERC721 token metadata
I am new to ERC721 tokens so this may be a stupid question.
I want to create my own ERC721 which can be integrated with opensea using the metadata, as far as I understand you have to store the ...
0
votes
1answer
26 views
Using geth Light Node to detect ERC-721 transactions
Is it possible to use a geth light node to detect incoming transactions executed via ERC-721 contracts?
I have experienced being not able to get receipts using getTransactionReceipt in native and ...
2
votes
3answers
88 views
ERC721 Tokens - Hold ETH in the token?
Would it be possible to create a ERC721 Token for say a game item, but I want the Token to basically have ETH inside the token, so that a user could destroy the token to reclai
1
vote
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 ...
0
votes
1answer
122 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/...
1
vote
1answer
62 views
onERC721Recieved implementation
As per the ERC721 requirements, I have to implement onERC721Recieved. This is how I did it:
function onERC721Received(
address _operator,
address _from,
uint256 _tokenId,
...
