Questions tagged [openzeppelin-contracts]
OpenZeppelin Contracts is a library for secure smart contract development. It provides implementations of standards like ERC20 and ERC721 which you can deploy as-is or extend to suit your needs, as well as Solidity components to build custom contracts and more complex decentralized systems.
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Is it possible for two users to receive the same nonce-generated ID in a Solidity smart contract?
I have a smart contract deployed on the Ethereum blockchain where each user who interacts with a specific function is assigned an ID based on a nonce value stored in the contract. The nonce is ...
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ERC721Enumerable - Getting all tokens owned by an address using balanceOf(owner) and tokenOfOwnerByIndex(owner, index)
I've been looking for a solution to retrieve all tokens from an address using ERC721Enumerable Openzeppelin extension. Please note that my purpose is not to get ALL tokens owned by an address, but all ...
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How to execute a transaction on a Gnosis Safe using Governor.sol? (getting GS020 error)
I'm trying to use a Governor.sol DAO to execute a passed proposal to transfer tokens from a Gnosis Safe. The Safe is a 1-of-2 with one of the signers being the DAO.
The last argument to safe....
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Can I use the OZ Ownable contract with a multisig wallet if I want some functions to require varying voting thresholds?
Some functions like the mint() will require unanimous approval from contract owners, while others will only require simple majority of contract owners. I want to use Safe Wallet or some other ...
- 382
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10
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Issues due to openzeppelin updated versions
Im building defi token Im developing it with reference cource in which the educator is using openzeppelin version 4.8.3 in which ERC20Mock contract takes 4 parameters , but right now there is only ...
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2
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27
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Trying to override non-virtual function. Did you forget to add "virtual"?
pragma solidity ^0.8.20;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract OC is ERC20, Ownable {
uint256 ...
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21
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Truffle test error "VM exception" ERC721
I have just created a .sol contract inheriting from openzeppelin ERC721. I have also written some tests, but I get the following errors:
Here is the code for .sol file:
// SPDX-License-Identifier: ...
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17
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Runtime error webpack-dev-server, solidity, openzeppelin
I'm working on a project using Truffle, solidity and openzeppelin. For web, I'm using the webpack-dev-server.
With Truffle, everything works, it compiles and migrates. Then I start the frontend with ...
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11
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Governance execute proposal of the governance contract itself or any other contract or restrict functions to come from a proposal only in the erc20
Is it possible to have a proposal that executes a function from the governance contract itself?
namely i would like to have every expense of the dao to come from a proposal.
does the target have to be ...
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69
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Help Needed: Resolving "EIP2612: Invalid Signature"
I am encountering an error message "EIP2612: invalid signature" when testing the permit function in my contract.
This is my contract:
// @inheritdoc IPayments
contract Payments is IPayments {...
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48
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How to use Access Control in different facets if a Diamond Contract
I am looking to change the design of my contract into diamond proxy. For that i have split up my contract into 3 parts. the issue i am facing is while setting up access control. When i am using OZ ...
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26
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MAX TOTAL SUPPLY ON ETHERSCAN IS 0
I deployed my token to MetaMask and it did not reflect the token name or the decimal. I manually had to input it. After I deployed to etherscan it is showing MAX TOTAL SUPPLY: 0 HOLDERS 0 TOTAL ...
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82
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TESTS FOR MY ERC20 TOKEN IS NOT WORKING
// SPDX-License-Identifier: SEE LICENSE IN LICENSE
pragma solidity ^0.8.24;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/...
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50
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Two or more base classes define function with same name and parameter types
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Capped.sol&...
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What can be the workaround to work with the new `Initializable` contract?
If we are using the initializable contract before OZ 0.5.0 for our transparent Upgradeable proxy.
It had two variables in slot 0.
uint8 private _initialized;
bool private _initializing;
Now in OZ 0.5....
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72
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An ERC1155 token metadata is not visible in polygonscan and etherscan
I have deployed a basic ERC1155 importing the Openzeppelin libraries.
Here is my smart contract.
// SPDX-License-Identifier: MIT
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8....
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62
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"ContractExecutionError: Error happened while trying to execute a function inside a smart contract" after calling it via mint button
Contract Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/...
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47
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Openzeppelin ERC721Enumerable getTokenIdsOfOwner reverts and I don't know why
I am trying to implement a staking contract, I wanted to map all the owned NFTs by a certain address, so came across ERC721Enumerable and getTokenIdsOfOwnerfunction, however whenever I call my ...
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Upgrading Smart Contracts with New Fields: How to Safely Modify Storage Layout
I'm working on upgrading my Ethereum smart contract, which utilizes upgradable smart contract patterns. Currently, I have a struct named GovernorCountingSimpleStorage with existing fields, and I want ...
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2
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81
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Smart contract creation
I just joined because I am trying to learn how to create Solidity contracts using OpenZepplin.
I am using also claude AI to guide me but it has a limit and it's going in circles now.
Until now I ...
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43
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ERC721 Transfer Event in Constructor
I thought that when you mint an ERC721 Token in the Constructor of your smart-contract it will not emit the Transfer event.
I'm thinking this cause of what's written in the official ERC721 EIP ...
- 1,021
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2
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351
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UUPS vs Beacon proxy pattern
I am delving into UUPS(Universal Upgradeable Proxy Standard) and Beacon proxy patterns.
I believe they serve distinct purposes, but I am unsure about the right use cases for each.
It seems that UUPS ...
- 377
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82
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How to get admin address while deploying transparent upgradeable proxy from OZ
After OZ version 5, the admin contract is deployed from within the constructor of the proxy.
And the admin address is emitted in the events of the deployment transaction. To get the admin address we ...
- 5,000
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1
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43
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Can I use safeTransfer from OpenZeppelin to send ETH along with ERC20 token?
My contract holds tokenA + ETH. Right now I pay users this way:
tokenAcontract.safeTransfer(wallet, amountTokenA); // tokenA
Address.sendValue(wallet, amountETH); // ETH
Can I do it in one single ...
- 101
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83
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Proxy Contracts Initializing problems
Good afternoon. I’ll be brief - there is a Module in my ecosystem, the module is initialized by the proxy factory DeployProxy.sol and then the proxy contract address is entered into the Core contract ...
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1
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34
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Getting "insufficient allowance" error
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./TokenA.sol";
import "./TokenB.sol";
contract ...
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0
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435
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Anti Sniper / anti Snipe Bot for newly listed token on pancakeswap
Can Somebody explain how to have Bot Protection enabled against sniper bot for a token contract which is going to launch on pancakeswap or on any other decentralised exchange.
do we have to create ...
2
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1
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295
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OZ transparent upgradeable proxy admin reverts when trying upgrade an implementation
I have this transparent upgradeable proxy deployed on sepolia - 0x2dFC2A866eac363cAFF516b5ce7aCd6bae1F21C1
This is the admin contract - 0x6d429719f78b146892403d06df677afa6f968d91
When I try to call ...
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0
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116
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Handling Conflicting @openzeppelin/contracts Versions in Hardhat Project
I am currently working on a Hardhat project that requires the integration of two custom dependencies, namely custom-dep-a and custom-dep-b. Unfortunately, these two dependencies rely on different ...
- 1,825
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15
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Issues in the ERC20 token Contract burn
I was just going through this contract and that the _balances[account] is being deducted before the require statement. Is this still correct?
also there was no else and seemed like it will be ...
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104
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Problem with "Openzeppelin ERC20Votes delegate function"
I hope you're doing great. I have been tinkering with ERC20Votes and creating a DAO for my Vendor contract. The issue I'm facing is that whenever I try to delegate my GovernanceToken contract to the ...
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1
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9
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new release of ERC1155SupplyUpgradeale has compilation issues
The new contracts lib from OZ, specifically ERC1155UspplyUpgradeable
has compilation issues before even inheriting it in any child contract (check screenshot below) any idea why? or how to fix it?
...
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Construction of OpenZeppelin voting contract with ٍERC777 token
I managed to easily create governor and implement voting with erc20 token, but now I have erc777 token that I need to do this with, please guide me how I can I have to do this because when I introduce ...
- 588
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188
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OpenZeppelin: Update UUPS proxy contract
I have such proxy:
import { upgrades } from "hardhat";
proxy = await upgrades.deployProxy(
Contract,
[
address,
flags,
],
{
initializer: "...
- 183
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63
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Does the OpenZeppelin nonReentrant modifier block calling all functions that have the modifier on them, or it keeps a separate state for each function
Would the nonReentrant modifier from the OpenZeppelin ReentrancyGuard library prevent the user from calling stake() when the unstake() function hasn't yet been fully processed (in the example below)?
...
- 1,484
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0
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205
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Create3 deployment with proxy contract ownership?
I have deployed an upgradable proxy contract with create3factory from solmate.
In my contract i transfer ownership to an address. But still the owner ship is not on that address. Its a differant ...
- 81
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1
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150
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Property 'PROPOSER_ROLE' does not exist on type 'BaseContract'
TimeLock contract extends from TimelockController from OpenZeppelin Contracts.
contract TimeLock is TimelockController {
constructor(
uint256 minDelay,
address[] memory proposers,
...
- 250
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1
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1k
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Property 'address' does not exist on type 'BaseContract'
I have TimeLock contract that extends TimelockController from OpenZeppelin contracts:
contract TimeLock is TimelockController {
constructor(
uint256 minDelay,
address[] memory proposers,
...
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27
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Issue with DynamicSvgNft Contract: getHighSVG() and getLowSVG() Functions Returning Incorrect Values
Hello Stack Exchange community!
I am currently working on a project that involves an NFT contract called DynamicSvgNft. The contract is designed to change the SVG image URI of the NFT based on a ...
- 71
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33
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1155URIStorage not available in npm package but is available on OpenZeppelin Github
I can import
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155URIStorage.sol"; on Remix.
But it throws an error in Hardhat.
I have attached a picture of node_modules and it ...
- 170
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2
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101
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UUPS proxy and file level constants, enums and structs compatibility
If i use UUPS upgradeable pattern and i define a couple of constants, enums and structs at the contract level, will those values still be available after an upgrade?
I have 3 contracts and all 3 are ...
- 113
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25
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How to limit canceller role in OpenZeppelin governance?
In openzeppelin governance contracts, a proposal can be cancelled by a wallet that has the canceller role. As the deployer of the DAO, I want to ensure the security of my DAO, hence I want to be able ...
- 240
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1k
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Do we need OpenZeppelin's Counter with Solidiity 8 any more?
According to Solidity documentation:
Prior to Solidity 0.8.0, arithmetic operations would always wrap in
case of under- or overflow leading to widespread use of libraries that
introduce additional ...
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237
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Is there still any reason to use SafeERC20Upgradeable with the ERC20Upgradeable?
From the ERC20Upgradeable docs:
"We have followed general OpenZeppelin Contracts guidelines:
functions revert instead returning false on failure. This behavior is nonetheless
conventional and ...
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What are the pros and cons of using OpenZeppelin ERC20Votes?
I want to use this extension for an ERC20 token.
What are the pros and cons (if any) of adding this to it?
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693
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How can i pass constructor args to test solidity contracts in Hardhat?
I am using openzepplin with role based access control to create erc-20 token
constructor(address minter, address burner) ERC20("ArtPlace Token", "ARTP") {
_mint(msg.sender, ...
- 11
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121
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Help me to make my idea clean on initializer, reinitializer and disableinitializer
Openzeppelin has a solidity script initializable.sol which has some modifiers and internal functions. I wanna clear my idea on these. I am describing what i know about it, correct me if i am wrong.
...
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471
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Derived contract must override function "supportsInterface". Two or more base classes define function with same name and parameter types
TypeError: Derived contract must override function "supportsInterface". Two or more base classes define function with same name and parameter types.
--> royalty.sol:9:1:
|
9 | contract ...
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1
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44
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how to receive values from openzeppelin royaltyInfo function
trying to implement like this
uint[2] memory royalty = royaltyInfo(_tokenId, price);
payable(royalty[0]).transfer(royalty[1]);
but getting error
TypeError: Different number of components on the left ...
2
votes
1
answer
576
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onlyInitializing vs initializer in OpenZeppelin Upgradeable Contracts
I'm reading the OpenZeppelin documentation about upgradeable contracts, and I'm getting a bit confused with these modifiers:
initializer
onlyInitializing
I think I understand how initializer works. ...
- 1,948