ETH Price: $2,527.33 (-0.07%)
Gas: 0.7 Gwei

Contract

0xc16aEb0DB5a912be921b2506be6Dc18dD3ac8424
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Claim189224972024-01-02 21:53:47240 days ago1704232427IN
0xc16aEb0D...dD3ac8424
0 ETH0.0052298720.82975623
Claim189224842024-01-02 21:51:11240 days ago1704232271IN
0xc16aEb0D...dD3ac8424
0 ETH0.0061541722.41664672
Set Minter189224822024-01-02 21:50:47240 days ago1704232247IN
0xc16aEb0D...dD3ac8424
0 ETH0.0009175423.26022937
Claim189224292024-01-02 21:39:47240 days ago1704231587IN
0xc16aEb0D...dD3ac8424
0 ETH0.0042368922.01099952
Set Minter189224092024-01-02 21:35:47240 days ago1704231347IN
0xc16aEb0D...dD3ac8424
0 ETH0.0008484223.15141255
Set Minter189224052024-01-02 21:34:59240 days ago1704231299IN
0xc16aEb0D...dD3ac8424
0 ETH0.0012890222.79567107
0x60a06040188965002023-12-30 6:16:35243 days ago1703916995IN
 Create: Free25
0 ETH0.0127048612.27996493

Latest 18 internal transactions

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Parent Transaction Hash Block From To
189224972024-01-02 21:53:47240 days ago1704232427
0xc16aEb0D...dD3ac8424
0 ETH
189224972024-01-02 21:53:47240 days ago1704232427
0xc16aEb0D...dD3ac8424
0 ETH
189224972024-01-02 21:53:47240 days ago1704232427
0xc16aEb0D...dD3ac8424
0 ETH
189224972024-01-02 21:53:47240 days ago1704232427
0xc16aEb0D...dD3ac8424
0 ETH
189224842024-01-02 21:51:11240 days ago1704232271
0xc16aEb0D...dD3ac8424
0 ETH
189224842024-01-02 21:51:11240 days ago1704232271
0xc16aEb0D...dD3ac8424
0 ETH
189224842024-01-02 21:51:11240 days ago1704232271
0xc16aEb0D...dD3ac8424
0 ETH
189224842024-01-02 21:51:11240 days ago1704232271
0xc16aEb0D...dD3ac8424
0 ETH
189224822024-01-02 21:50:47240 days ago1704232247
0xc16aEb0D...dD3ac8424
0 ETH
189224822024-01-02 21:50:47240 days ago1704232247
0xc16aEb0D...dD3ac8424
0 ETH
189224292024-01-02 21:39:47240 days ago1704231587
0xc16aEb0D...dD3ac8424
0 ETH
189224292024-01-02 21:39:47240 days ago1704231587
0xc16aEb0D...dD3ac8424
0 ETH
189224292024-01-02 21:39:47240 days ago1704231587
0xc16aEb0D...dD3ac8424
0 ETH
189224292024-01-02 21:39:47240 days ago1704231587
0xc16aEb0D...dD3ac8424
0 ETH
189224092024-01-02 21:35:47240 days ago1704231347
0xc16aEb0D...dD3ac8424
0 ETH
189224092024-01-02 21:35:47240 days ago1704231347
0xc16aEb0D...dD3ac8424
0 ETH
189224052024-01-02 21:34:59240 days ago1704231299
0xc16aEb0D...dD3ac8424
0 ETH
189224052024-01-02 21:34:59240 days ago1704231299
0xc16aEb0D...dD3ac8424
0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Free25

Compiler Version
v0.8.23+commit.f704f362

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

File 1 of 2: Free25.sol
// SPDX-License-Identifier: CC0


/*
 /$$$$$$$$ /$$$$$$$  /$$$$$$$$ /$$$$$$$$        /$$$$$$  /$$$$$$$
| $$_____/| $$__  $$| $$_____/| $$_____/       /$$__  $$| $$____/
| $$      | $$  \ $$| $$      | $$            |__/  \ $$| $$
| $$$$$   | $$$$$$$/| $$$$$   | $$$$$           /$$$$$$/| $$$$$$$
| $$__/   | $$__  $$| $$__/   | $$__/          /$$____/ |_____  $$
| $$      | $$  \ $$| $$      | $$            | $$       /$$  \ $$
| $$      | $$  | $$| $$$$$$$$| $$$$$$$$      | $$$$$$$$|  $$$$$$/
|__/      |__/  |__/|________/|________/      |________/ \______/



 /$$
| $$
| $$$$$$$  /$$   /$$
| $$__  $$| $$  | $$
| $$  \ $$| $$  | $$
| $$  | $$| $$  | $$
| $$$$$$$/|  $$$$$$$
|_______/  \____  $$
           /$$  | $$
          |  $$$$$$/
           \______/
  /$$$$$$  /$$$$$$$$ /$$$$$$$$ /$$    /$$ /$$$$$$ /$$$$$$$$ /$$$$$$$
 /$$__  $$|__  $$__/| $$_____/| $$   | $$|_  $$_/| $$_____/| $$__  $$
| $$  \__/   | $$   | $$      | $$   | $$  | $$  | $$      | $$  \ $$
|  $$$$$$    | $$   | $$$$$   |  $$ / $$/  | $$  | $$$$$   | $$$$$$$/
 \____  $$   | $$   | $$__/    \  $$ $$/   | $$  | $$__/   | $$____/
 /$$  \ $$   | $$   | $$        \  $$$/    | $$  | $$      | $$
|  $$$$$$/   | $$   | $$$$$$$$   \  $/    /$$$$$$| $$$$$$$$| $$
 \______/    |__/   |________/    \_/    |______/|________/|__/


CC0 2023
*/


pragma solidity ^0.8.23;


import "./FreeChecker.sol";


interface ColdHardCash {
  function ownerOf(uint256) external view returns (address);
  function isRedeemed(uint256) external view returns (bool);
}

contract Free25 is FreeChecker {

  mapping(uint256 => address) public cashToMinter;

  ColdHardCash public cash = ColdHardCash(0x6DEa3f6f1bf5ce6606054BaabF5452726Fe4dEA1);

  function setMinter(uint256 cashTokenId, address minter) external {
    require(cash.ownerOf(cashTokenId) == msg.sender, 'Not owner of CASH token');
    require(cash.isRedeemed(cashTokenId), 'CASH token not redeemed');

    cashToMinter[cashTokenId] = minter;
  }

  function claim(uint256 free0TokenId, uint256 cashTokenId) external {
    preCheck(free0TokenId, '25');
    require(cashToMinter[cashTokenId] == msg.sender, 'Address cannot mint');
    postCheck(free0TokenId, 25, '25');
  }
}

File 2 of 2: FreeChecker.sol
// SPDX-License-Identifier: CC0


/*
CC0 2023
*/


pragma solidity ^0.8.23;

interface IFree {
  function totalSupply() external  view returns (uint256);
  function balanceOf(address) external  view returns (uint256);
  function ownerOf(uint256 tokenId) external view returns (address owner);
  function tokenIdToCollectionId(uint256 tokenId) external view returns (uint256 collectionId);
  function collectionSupply(uint256 collectionId) external view returns (uint256);
  function collectionIdToMinter(uint256 collectionId) external view returns (address);
  function mint(uint256 collectionId, address to) external;
  function appendAttributeToToken(uint256 tokenId, string memory attrKey, string memory attrValue) external;
  function safeTransferFrom(address from, address to, uint256 tokenId) external;
}

abstract contract FreeChecker {
  mapping(uint256 => bool) public free0TokenIdUsed;
  IFree public immutable free = IFree(0x30b541f1182ef19c56a39634B2fdACa5a0F2A741);

  function preCheck(uint256 free0TokenId, string memory freeStr) internal view {
    require(free.tokenIdToCollectionId(free0TokenId) == 0, 'Invalid Free0');
    require(!free0TokenIdUsed[free0TokenId],
      string(abi.encodePacked('This Free0 has already been used to mint a Free', freeStr))
    );
    require(free.ownerOf(free0TokenId) == msg.sender, 'You must be the owner of this Free0');

  }

  function postCheck(uint256 free0TokenId, uint256 freeNumber, string memory freeStr) internal {
    free0TokenIdUsed[free0TokenId] = true;
    free.appendAttributeToToken(free0TokenId,
      string(abi.encodePacked('Used For Free', freeStr, ' Mint')),
      'true'
    );
    free.mint(freeNumber, msg.sender);
  }

  function checkFreeToken(uint256 freeTokenId, uint256 collectionId) internal view {
    require(free.ownerOf(freeTokenId) == msg.sender, 'Not owner of token');
    require(free.tokenIdToCollectionId(freeTokenId) == collectionId, 'Token collection mismatch');
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"name":"cash","outputs":[{"internalType":"contract ColdHardCash","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"cashToMinter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"free0TokenId","type":"uint256"},{"internalType":"uint256","name":"cashTokenId","type":"uint256"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"free","outputs":[{"internalType":"contract IFree","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"free0TokenIdUsed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"cashTokenId","type":"uint256"},{"internalType":"address","name":"minter","type":"address"}],"name":"setMinter","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://8e560e191f5f7c37d2bba2917e8df303940e61208e09698d0b2be3127e65371f

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.