python (12.9k questions)

javascript (9.2k questions)

reactjs (4.7k questions)

java (4.2k questions)

java (4.2k questions)

c# (3.5k questions)

c# (3.5k questions)

html (3.3k questions)

Questions - erc721

Guarantee a contract can only receive one type of ERC721 nft

Creating a contract for a privateSale fo ERC721 NFTs, first I mint some inventory to the privateSale contract address implementing onErc721Received(...) what I want to guarantee is that this privateSa...
test-img

Carlos Sanchez

solidity

erc721

Votes: 0

Answers: 1

Latest Answer

The ERC721 standard defines two types of transfer functions: safeTransferFrom() that checks if the receiver is a contract - and if it is, tries to execute the onERC721Received() function on the recei...
test-img

Petr Hejda

Internal JSON-RPC error with MetaMask on Polygon Blockchain. `ERC721: transfer caller is not owner nor approved.`

I am making an NFT marketplace. When I deployed my contract on the Mumbai-testnet. The createToken function might work cause it brings up the Metamask for the Gas Fee but after that, the Error occurs ...
test-img

Megabyte

blockchain

polygon

solidity

metamask

erc721

Votes: 0

Answers: 3

Latest Answer

Thank You for your efforts. I got the solution to it(After Searching for 3 days). SOLUTION=> There's currently a bug on Mumbai causing deployed addresses to be incorrect. This is causing the constr...
test-img

Megabyte

Use external packages in eth-brownie?

I am trying open a ERC721 smart contract in Brownie on VSCode and loop through the token ids and set the URI of each in each iteration. I execute the script with brownie run scripts/parcel_asset/testp...
test-img

werkhardor

python

odbc

brownie

erc721

Votes: 0

Answers: 2

Latest Answer

If you installed brownie with pipx, you'll need to inject outside packages into your project. So instead of pip install matplotlib It would be pipx inject eth-brownie matplotlib pipx installs packag...
test-img

Patrick Collins

Burning Deployed ERC Tokens In an NFT Mint Function - Compiles, but Transaction Fails

I am very new to Solidity, and have recently been working on trying to learn the ropes. For reference, I have been using code from this video (https://www.youtube.com/watch?v=tBMk1iZa85Y) as a primer ...
test-img

brandonman

solidity

erc20

erc721

Votes: 0

Answers: 1

Latest Answer

I'm not sure why are you trying to burn link in order to mint and nft but first check if the link code does not have a require that check if the destination address is the burn address if it has then ...
test-img

jhonny

Posts

Questions

Blogs

Jobs