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Beiträge

38
  • MetaInvestor.
    MetaInvestor8
    Mar 29, 2025
    Experten Q&A

    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
    0
    1
  • 0xflavoredBy_God.
    0xflavoredBy_God10
    Feb 27, 2025
    Diskussion

    Reise zur intelligenten Vertragsprüfung

    Welchen Rat geben Sie jemandem, der gerade erst mit der Prüfung intelligenter Verträge beginnt

    • Smart Contract
    • Solidity
    • Yul
    0
    1
  • Eyitayo Da Dev.
    Eyitayo Da Dev10
    Feb 24, 2025
    Diskussion

    Hallo Leute, ich bin neu hier. Ich hatte gehofft, jemand könnte mir Links geben, um Solidität effektiv zu lernen.

    //SDPX-Lizenz-ID: MIT Pragma Solidität 0.8.24; Vertrag Hallo Welt { string public Hallo Welt; } //Musste hier einfach etwas hinzufügen

    • Smart Contract
    • Solidity
    0
    2
  • thegreatfeez.
    thegreatfeez14
    Dec 09, 2024
    Diskussion

    Einsteiger in Solidity

    Nachdem ich den Anfängerkurs über Cyfrin Updraft besucht habe, versuche ich etwas aufzubauen, um das Wissen zu festigen, aber es ist, als ob ich nichts wüsste. Das macht mich wirklich traurig. Welchen Rat werdet ihr geben

    • Smart Contract
    • Solidity
    2
    3
    Beste Antwort
  • 0x1e3f...4698.
    0x1e3f...469810
    Sep 13, 2024
    Diskussion

    Seeking Freelance Opportunities for Beginner Solidity Developer"

    I have been studying Solidity for a couple of weeks and do not have any previous IT background. Are there any opportunities for me to get freelance work or earn money with my current skills?

    • Solidity
    • Use cases
    0
    0
  • 0xb5d6...1329.
    0xb5d6...132910
    Jul 24, 2024
    Diskussion

    Formatting/Hello

    I am new to Solidity! I wanted to say hello to this awesome community in hopes that it will get me out of my shell, and hopefully meet new people. I have zero programming experience, but love crypto. When posting questions in these forums is there a certain format I should post my question in, and/or any not so obvious rules I should follow in these forums? Thank you for taking the time to read, and leaving a reply!

    • Smart Contract
    • Solidity
    • Use cases
    0
    1
  • 0xe731...d226.
    0xe731...d22610
    Jul 13, 2024
    Diskussion

    Career Path in WEB3 Auditing: Project Building or Learning Auditing First?

    Hi everyone, I've recently completed the Solidity and Foundry basic and advanced courses with Cyfrin Updraft. I'm contemplating my next steps and considering a career in Solidity. Should I start learning smart contract auditing at this stage, or would it be more beneficial to first create some projects to solidify my current knowledge? Looking forward to your advice!

    • Smart Contract
    • Solidity
    0
    1
  • 0xa0c8...4ff4.
    0xa0c8...4ff415
    Jun 04, 2024
    Experten Q&A

    How often does the solidity syntax change

    I'd like to know how often the solidity syntax rules are changed and the best newsletter to follow up on the most recent updates

    • Smart Contract
    • Solidity
    • Language Grammar
    • Solidity Compiler
    1
    1
  • Serpent0x.
    Serpent0x10
    May 31, 2024
    Diskussion

    Reentrancy Vulnerability

    Hello everyone , I've noticed that the offer function uses the .call{value: amount}("") method to send Ether to the recipient's address. Could anyone provide insight into whether this function is indeed vulnerable to reentrancy and suggest any best practices or modifications to mitigate such risks? function _offer(address to, uint256 amount) internal { balance -= amount; (bool success, ) = to.call{value: amount}(""); if (!success) { revert TransferFailed(address(0), address(this), to, amount); } } `

    • Smart Contract
    • Solidity
    • Solidity Compiler
    0
    1
  • 0x30b1...765c.
    0x30b1...765c11
    Apr 04, 2024
    Diskussion

    About the flash loan

    Hello guys, I have a question what if a user borrows $1000 from the lending pool and user does some stuff? Now what if a user transfers that money to another address and destroys his wallet? Because the user already transferred to another contract how would he get reverted with $1000 into the lending pool now?

    • Solidity
    0
    1
Solidity.
Soliditysoliditylang.org

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).

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