淺談量化合約(合約量化)對沖搬磚系統(tǒng)開發(fā)策略及詳情丨源碼運營版
Web3.0通過將信息交互從屏幕轉(zhuǎn)移到物理空間,改變了終端用戶體驗,因而也有稱Web3.0為“空間網(wǎng)絡(Spatial Web)”。
該“空間網(wǎng)絡”包括空間交互層(利用智能眼鏡或語音等實現(xiàn)實時信息交互)、數(shù)字信息層(借助傳感和數(shù)字映射為每一個對象創(chuàng)建數(shù)字孿生)和物理層(通過感觀了解和體驗的世界)。
區(qū)塊鏈作為一種新型的技術組合,源碼案例:I35詳細7O98系統(tǒng)O7I8 綜合了P2P網(wǎng)絡、共識算法、非對稱加密、智能合約等新型技術,是一種在對等網(wǎng)絡(也稱分布式網(wǎng)絡、點對點網(wǎng)絡)環(huán)境下,通過透明和可信的規(guī)則,構建可追溯的塊鏈式數(shù)據(jù)結構,具有分布式對等、鏈式數(shù)據(jù)塊、防偽造和防篡改、可追溯、透明可信和高可靠性的典型特征
DAPP是去中心化應用程序/分布式的應用程序,是底層區(qū)塊鏈平臺生態(tài)上衍生的各種分布式應用,也是區(qū)塊鏈世界中的基礎服務提供方。
將應用程序分布在不同節(jié)點上,通過共識機制和區(qū)塊鏈平臺來完成任務的應用程序,它本身就是去中心化,不依賴于任何中心化服務器,促使用戶交易更加安全。
truffle init rentable-nft
cd rentable-nft
truffle create contract RentablePets
truffle create contract IERC4907
truffle create contract ERC4907
truffle create test TestRentablePets
rentable-nft
├──contracts
│├──ERC4907.sol
│├──IERC4907.sol
│└──RentablePets.sol
├──migrations
│└──1_deploy_contracts.js
├──test
│└──test_rentable_pets.js
└──truffle-config.js
//SPDX-License-Identifier:MIT
pragma solidity>=0.4.22<0.9.0;
interface IERC4907{
//Logged when the user of a NFT is changed or expires is changed
///notice Emitted when the`user`of an NFT or the`expires`of the`user`is changed
///The zero address for user indicates that there is no user address
event UpdateUser(uint256 indexed tokenId,address indexed user,uint64 expires);
///notice set the user and expires of a NFT
///dev The zero address indicates there is no user
///Throws if`tokenId`is not valid NFT
///param user The new user of the NFT
///param expires UNIX timestamp,The new user could use the NFT before expires
function setUser(uint256 tokenId,address user,uint64 expires)external;
///notice Get the user address of an NFT
///dev The zero address indicates that there is no user or the user is expired
///param tokenId The NFT to get the user address for
///return The user address for this NFT
function userOf(uint256 tokenId)external view returns(address);
///notice Get the user expires of an NFT
///dev The zero value indicates that there is no user
///param tokenId The NFT to get the user expires for
///return The user expires for this NFT
function userExpires(uint256 tokenId)external view returns(uint256);
}