帖子
分享您的知识。
How to generate random Number between 1&2 without VRF?
So I was making a coinflip game which assigns head- 1 and tails -2 and when user places bet on polygon chain.... smart contract generates a random number between 1 and 2 and if the outcome is same...user gets double - (5 % as fee to the owner of contract) ! from a pool and if outcome is different then user loses all and the lost amount is deposited in the pool - (3% as fee to the owner) (to fund winners)... but any way to make genrate a random number? I have no funds at all so I can't afford chainlink VRF to generate. So is there any other secure way for this? plus I am pritty new to solidity so I made this code with help of chat gpt but I don't it works....can anyone help to make the code better? code-
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract CoinFlip {
address public owner;
uint256 public contractBalance;
event BetPlaced(address indexed player, uint256 amount, bool choice);
event BetResult(address indexed player, uint256 amount, bool won);
constructor() {
owner = msg.sender;
}
function placeBet(bool choice) external payable {
require(msg.value > 0, "Bet amount must be greater than 0");
bool outcome = (block.timestamp % 2 == 0); // Simple pseudo-random outcome
if (outcome == choice) {
uint256 winAmount = (msg.value * 2 * 95) / 100;
require(address(this).balance >= winAmount, "Insufficient contract balance");
payable(msg.sender).transfer(winAmount);
emit BetResult(msg.sender, winAmount, true);
} else {
uint256 lostAmount = (msg.value * 97) / 100;
contractBalance += lostAmount;
emit BetResult(msg.sender, msg.value, false);
}
emit BetPlaced(msg.sender, msg.value, choice);
}
function depositFunds() external payable {
require(msg.sender == owner, "Only owner can deposit funds");
contractBalance += msg.value;
}
function withdrawFunds(uint256 amount) external {
require(msg.sender == owner, "Only owner can withdraw funds");
require(amount <= address(this).balance, "Insufficient contract balance");
payable(owner).transfer(amount);
contractBalance -= amount;
}
}
- Smart Contract
- Solidity
答案
1“但是有什么办法可以让生成一个随机数吗?”-不是真的,大多数区块链,尤其是EVM,在设计上都是确定性的. 你生成的代码使用区块的时间戳来实现随机性,但只要付出足够的努力就可以对其进行操作.
诸如chainlink之类的一些服务在区块链上随机发布内容供其他合约使用,基本上就像第三方一样,有一些数学保证. 有Chainlink的替代方案,但它们使用的方法非常相似,而且不那么受欢迎. 因此,如果你想要一个良好的链上随机性来源,那么chainlink可能是你目前最好的选择. 如果你只是在学习 solidity 而不担心安全性,你可以尝试使用时间戳的方法,就像生成的代码片段中一样.
你知道答案吗?
请登录并分享。
Solidity is an object-oriented, high-level language for implementing smart contracts. It is a curly-bracket language designed to target the Ethereum Virtual Machine (EVM).