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목록Blockchain (89)
ReasonJun
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/presets/ERC20PresetMinterPauser.sol) pragma solidity ^0.8.0; import "../ERC20.sol"; import "../extensions/ERC20Burnable.sol"; import "../extensions/ERC20Pausable.sol"; import "../../../access/AccessControlEnumerable.sol"; import "../../../utils/Context.sol"; /** * @dev {ERC20} token, including: * * - abi..
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/presets/ERC721PresetMinterPauserAutoId.sol) pragma solidity ^0.8.0; import "../ERC721.sol"; import "../extensions/ERC721Enumerable.sol"; import "../extensions/ERC721Burnable.sol"; import "../extensions/ERC721Pausable.sol"; import "../../../access/AccessControlEnumerable.sol"; import "../../../utils/Cont..
![](http://i1.daumcdn.net/thumb/C150x150/?fname=https://blog.kakaocdn.net/dn/bgEVRA/btsyWfJiMeO/tQCXkKNabEtjgRs5ksdKpK/img.png)
ERC-721 is a standard for non-fungible tokens (NFTs) on the Ethereum blockchain. NFTs are unique digital assets that cannot be replicated or replaced. This is in contrast to fungible tokens, such as ERC-20 tokens, which are interchangeable and can be replaced with one another. ERC-721 tokens are often used to represent digital collectibles, such as artwork, music, or game items. They can also be..
In Etherscan, "Verify" is a process that allows developers to upload the source code of their smart contracts to the Etherscan website. Once the source code is uploaded, Etherscan will match it with the bytecode that is deployed on the Ethereum blockchain. If the source code and bytecode match, the contract will be verified. Verifying a contract has several benefits: It provides transparency for..
Ethereum-Waffle is a testing framework for Ethereum smart contracts. It is designed to be easy to use and to provide a comprehensive set of features for testing smart contracts. Waffle provides the following features: A simple and intuitive API for writing tests Support for all of the Solidity features A built-in mocking framework A built-in snapshotting framework A built-in coverage reporting f..
![](http://i1.daumcdn.net/thumb/C150x150/?fname=https://blog.kakaocdn.net/dn/bLb6wz/btsyQRb2Nqp/HnahSoyqno6uDOQr1P1Slk/img.png)
The ethers.constants.AddressZero constant is a special address that represents the null address. This address is used to represent the address of the contract that is creating tokens. The null address is a special address that is not associated with any account. It is used to represent the absence of an address. For example, if a token is transferred to the null address, the token is effectively..