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Im writing a function in solidity where the user enters a CID from an IPFS link, which looks like: QmcQvCyLAncpEzvmYtKfvVPVayGqFvTQrYpUpPAJeoXGke So far im using string type, and it works. … Which is the correct and most efficient type for a CID? (int / uint?, bytes? ) function storeCID(string memory cid) public returns (uint256){ // some login here... } …

i < hashLength; ++i) { hashString[i + 2] = sha256Hash_[i]; } return Base58.encodeToString(hashString); } More examples in the repo: https://github.com/0x00000002/ipfs-cid-solidity …

I'm storing IPFS hash in solidity using this guide https://www.reddit.com/r/ethdev/comments/6lbmhy/a_practical_guide_to_cheap_ipfs_hash_storage_in/ const cid = "QmNXnCWPS2szLaQGVA6TFtiUAJB2YnFTJJFTXPGuc4wocQ … pragma solidity ^0.4.4; contract Hello { bytes32 x; function getBytes() returns(bytes32){ return x; } function setBytes(bytes32 b) { x = b; } } …

Here is my smart contract: // SPDX-License-Identifier: MIT pragma solidity ^ 0.8.10; //import Open Zepplin contracts import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts … I am sure I did not use the jpeg CID. …

I created 13 images and corresponding JSON files uploaded the images to pinata then changed the file_url in the JSON file to cid of the image "ipfs://cid/image.png" uploaded the json file as well. changed … owner.address); console.log("Owner has tokens: ", tokens); } main() .then(() => process.exit(0)) .catch((error) => { console.error(error); process.exit(1); }); and here is my contract pragma solidity …

_id)); // Its logs 'M' }); Here is the solidity code: pragma solidity ^0.4.21; contract test2 { bytes32 public _id; event LogTestCase( bytes32 _id ); function setID(bytes32 … cId) returns (bool){ _id = cId; emit LogTestCase(_id); return true; } } Now when I put '1234' as a parameter, fetching it from the contract event results in 'M'. …

@openzeppelin/contracts/token/ERC721/ERC721Burnable.sol:12:46: abstract contract ERC721Burnable is Context, ERC721 ^----^ ERC-721 Contract pragma solidity … (uint256 tokenId) public view returns (string memory) { require(_exists(tokenId), "ERC721Metadata: CID query for nonexistent token"); string memory _CID = _CIDS[tokenId]; return _CID …

I just have to upload metadata files into an IPFS bucket and put CID into my contract as constant variable (so even me, the owner of the contract, will not be able to update them). … I never ear about a Solidity file fetcher or even JSON parser. Generate 2 tokens linked each other When a user will mint a token, I'll in fact mint 2. …

man you are missing a slash / pragma solidity ^ 0.8.10; //import Open Zepplin contracts import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import … create an NFT function mint() public returns (uint256) { _tokenIds += 1; _safeMint(msg.sender, _tokenIds); return _tokenIds; } //in the function below include the CID …