DApp質押借貸挖礦系統開發|流動性質押分紅模式定製(原始碼搭建)
區塊鏈賬戶不需要使用者到銀行機構或者其他部門申請,因為整個系統中沒有這樣的中心化部門來管理賬戶資訊,使用者只需要根據一種非對稱加密演算法來生成一個金鑰對,其公鑰作為賬戶地址,也就是常說的區塊鏈錢包地址,這個地址可以在網路中廣播,允許網路中所有的賬戶獲取和使用。
該賬戶是公開的。系統I34-開發I633-原始碼53I9,私鑰作為轉賬交易的簽名和密碼,由使用者私人保管,每次轉賬時,需要透過私鑰簽名來證明交易的合法性。在現實使用中,區塊鏈錢包會將私鑰進行對稱加密,透過使用者輸入人類能夠理解的密碼作為私鑰加密的金鑰,將區塊鏈金鑰以密文的形式儲存到磁碟空間中。需要注意的是,如果忘記解密金鑰的密碼,就失去了對賬戶的操作許可權。
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "./IERC20Metadata.sol"; contract ERC20 is IERC20, IERC20Metadata { // 地址餘額 mapping(address => uint256) private _balances; // 授權地址餘額 mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; // 設定代幣名稱符號,並初始化鑄造了10000000000代幣在釋出者帳號下。 constructor() { _name = "HarryToken"; _symbol = "HYT"; _mint(msg.sender, 10000000000); } function name() public view virtual override returns (string memory) { return _name; } function symbol() public view virtual override returns (string memory) { return _symbol; } /// 小數點位數一般為 18 function decimals() public view virtual override returns (uint8) { return 18; } // 返回當前流通代幣的總量 function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } // 查詢指定帳號地址餘額 function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } // 轉帳功能 function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = msg.sender; _transfer(owner, to, amount); return true; } // 獲取被授權者可使用授權帳號的可使用餘額 function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } // 授權指定帳事情可使用自己一定額度的帳戶餘額。 // 授權spender, 可將自己餘額。使用可使用的餘額的總量為amount function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = msg.sender; _approve(owner, spender, amount); return true; } //approve函式中的spender呼叫,將授權人 from 帳戶中的代幣轉入to 帳戶中 function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = msg.sender; _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = msg.sender; _approve(owner, spender, _allowances[owner][spender] + addedValue); return true; } function decreaseAllowance(address spender, uint256 substractedValue) public virtual returns (bool) { address owner = msg.sender; uint256 currentAllowance = _allowances[owner][spender]; require(currentAllowance >= substractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - substractedValue); } return true; } function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; } _balances[to] += amount; emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/70011332/viewspace-2938834/,如需轉載,請註明出處,否則將追究法律責任。
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