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Results tagged with erc-721
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user 27263
Relating to ERC-721, the standard for Non-Fungible Tokens (also known as Deeds)
9
votes
1
answer
5k
views
What is the bytes data param in safeTransferFrom?
In ERC721 and ERC1155, 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?) …
- 1,164
3
votes
1
answer
1k
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 …
- 1,164
2
votes
1
answer
512
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 ERC721 / …
- 1,164
2
votes
2
answers
1k
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. …
- 1,164
1
vote
1
answer
760
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 …
- 1,164
1
vote
1
answer
175
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 fr …
- 1,164
1
vote
1
answer
9k
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 own …
- 1,164
1
vote
2
answers
7k
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) pub …
- 1,164
1
vote
1
answer
789
views
Timestamp is lower than or equal to previous block
I have a function where a specific time should be passed to run it.
function placeBid(...) {
require(auction.startedAt <= block.timestamp, "not started yet");
...
}
say startedAt is a unix value …
- 1,164
0
votes
1
answer
31
views
tokenId generated from left shift operator vs. increment
tokenId = (nonce << 128); // i.e. 340282366920938463463374607431768211457, 680564733841876926926749214863536422913
vs.
tokenId = counter.increment(); // i.e. 1, 2, 3 incrementally
i see some projec …
- 1,164