File 1 of 1: Sypher.sol
pragma solidity ^0.8.0;
contract Sypher {
string public name = "Sypher";
string public symbol = "SYPHER";
uint8 public decimals = 18;
uint256 public totalSupply = 1000000 * 10 ** uint256(decimals);
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
event OwnershipRenounced(address indexed previousOwner);
address public owner;
constructor() {
owner = msg.sender;
balanceOf[msg.sender] = totalSupply;
}
modifier onlyOwner() {
require(msg.sender == owner, "Caller is not the owner");
_;
}
function approve(address spender, uint256 value) public returns (bool success) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
allowance[msg.sender][spender] += addedValue;
emit Approval(msg.sender, spender, allowance[msg.sender][spender]);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
require(allowance[msg.sender][spender] >= subtractedValue, "Decreased allowance below zero");
allowance[msg.sender][spender] -= subtractedValue;
emit Approval(msg.sender, spender, allowance[msg.sender][spender]);
return true;
}
function transfer(address to, uint256 value) public returns (bool success) {
require(balanceOf[msg.sender] >= value, "Insufficient balance");
balanceOf[msg.sender] -= value;
balanceOf[to] += value;
emit Transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint256 value) public returns (bool success) {
require(value <= balanceOf[from], "Insufficient balance");
require(value <= allowance[from][msg.sender], "Insufficient allowance");
balanceOf[from] -= value;
balanceOf[to] += value;
allowance[from][msg.sender] -= value;
emit Transfer(from, to, value);
return true;
}
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0), "New owner is not a valid address");
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(owner);
owner = address(0);
}
}{
"compilationTarget": {
"Sypher.sol": "Sypher"
},
"evmVersion": "paris",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
