Questions tagged [erc-721]

Relating to ERC-721, the standard for Non-Fungible Tokens (also known as Deeds)

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Is there a performance penalty towards creating the maximum number of tokens with ERC-20 etc?

I saw this link: Max possible ERC20 Tokens allowed with 18 decimals? Is there a performance penalty for creating so many tokens? Obviously the number of storage capacity needed for mining will be ...
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4answers
237 views

Is it possible to obscure the owner of a non-fungible token?

Basically, I'd like to have unique records which can be transferred between parties without anyone knowing who owns a particular record until a transfer occurs, at which time only the recipient can ...
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2answers
385 views

Conformance test suite for ERC-721 smart contracts

Entities like Open Zeppelin offer "well tested and audited" (I'm paraphrasing) open source Solidity code for common patterns such as ownership, ERC20 tokens, etc. Are there any such entities (or just ...
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1answer
255 views

How to detect Ethereum ERC721 token

I have read the EIP abount ERC165 that is enable us to detect which interface is implemented in a contract. However, I found that some ERC721 tokens are a little bit diffrent from others, like ...
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1answer
709 views

Why we can not add erc721 tokens in wallet?

I have created an erc721 token and when i try to transfer it from one address to another address that transaction is not visible on etherscan, moreover tokens are also not visible in mew or metamask? ...
4
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1answer
628 views

Why are the transfer and approve functions payable in the ERC-721 spec?

In the ERC-721 spec interface, the functions safeTransferFrom, transferFrom and approve all have the payable modifier. What is the reason for this? As far as I can tell, none of these functions ...
2
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2answers
381 views

ERC721 ownedTokens array length limitations on owners with thousands of tokens

In the ERC721Token contract, I am wondering the limits of: mapping (address => uint256[]) private ownedTokens; I am interested in providing functionality for users to potentially have thousands ...
2
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2answers
135 views

Bitwise XOR used as signature

In a sample ERC721 contract linked from a loom-network medium post, I saw this code: bytes4 constant InterfaceSignature_ERC721 = bytes4(keccak256('name()')) ^ bytes4(keccak256('symbol()')) ^ ...
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4answers
470 views

Non transferrable ERC721 token?

Is it possible to create a non transferrable ERC721 token? For whatever reason that some tokens I intend not to be transferrable, could I perhaps implement transfer in such a way that it could read a ...
3
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1answer
1k views

I need help writing a working ERC 721 contract [closed]

I have been unable to write a working ERC 721 contract.Can someone help me with a sample ERC 721 contract that works? I have been learning for about a week now and I haven't made much progress.
6
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1answer
368 views

creation ERC721 error: Transaction failed, invalid address,

I would like to learn how ERC721 token works. I found some sample contracts online and tried to use remix and Ethereum Wallet to deploy the contract. The compile was fine but failed in the creation. ...
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1answer
507 views

Trying to mint 721 tokens from external contract gives invalid opcode

I'm trying to build a second layer to erc721 nft. The problem is: I believe totalsupply is not in the proper format, but I'm not sure how to get totalSupply to be a uint passable into mint(). If I ...
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1answer
556 views

How to track ERC721 token transfers?

Wallets and etherscan can track ERC20 tokens an account owns, but are there plans for them to track ERC721 ownership?
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1answer
445 views

Creating a financially feasible Land Title blockchain [closed]

The Project: A block of land, subdivided into several hundred thousand parcels that needs publicly verifiable tracking of current ownership. While I do have a particular project I'm working with, I ...
4
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1answer
4k views

How to create your own ERC 721 NFT token [closed]

I am trying to create my own ERC-721 non fungible token and unable to find any docs, basic code and how to deploy it on a testnet. Could someone share the official specification and an example of how ...