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1 address found via
Transaction Hash
Method
Block
From
To
Join236919502025-10-30 18:20:35114 days ago1761848435IN
Sky: MCD Join ETH A
0 ETH0.000043820.59397236
Join236919472025-10-30 18:19:59114 days ago1761848399IN
Sky: MCD Join ETH A
0 ETH0.000050080.55107569
0x68747470225485142025-05-23 22:22:59274 days ago1748038979IN
Sky: MCD Join ETH A
0 ETH0.000052962
0x68747470225481422025-05-23 21:07:47274 days ago1748034467IN
Sky: MCD Join ETH A
0 ETH0.000052962
0x68747470225477722025-05-23 19:52:59274 days ago1748029979IN
Sky: MCD Join ETH A
0 ETH0.000052962
0x68747470225474032025-05-23 18:38:11274 days ago1748025491IN
Sky: MCD Join ETH A
0 ETH0.000052962
0x68747470224133582025-05-04 22:25:59293 days ago1746397559IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224129822025-05-04 21:10:23293 days ago1746393023IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224125872025-05-04 19:50:11293 days ago1746388211IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224118032025-05-04 17:12:47293 days ago1746378767IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224114372025-05-04 15:58:47293 days ago1746374327IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224110612025-05-04 14:42:59293 days ago1746369779IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224106882025-05-04 13:27:23293 days ago1746365243IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224103192025-05-04 12:12:47293 days ago1746360767IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224099512025-05-04 10:57:59293 days ago1746356279IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224095792025-05-04 9:43:11294 days ago1746351791IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224092092025-05-04 8:28:11294 days ago1746347291IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224088422025-05-04 7:13:47294 days ago1746342827IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224084672025-05-04 5:57:47294 days ago1746338267IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224080932025-05-04 4:42:47294 days ago1746333767IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224077232025-05-04 3:28:11294 days ago1746329291IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224073542025-05-04 2:13:35294 days ago1746324815IN
Sky: MCD Join ETH A
0 ETH0.000022921
0x68747470224070092025-05-04 1:03:59294 days ago1746320639IN
Sky: MCD Join ETH A
0 ETH0.000022751
Exit222157632025-04-07 8:14:23321 days ago1744013663IN
Sky: MCD Join ETH A
0 ETH0.0010452413.71172734
Exit222157622025-04-07 8:14:11321 days ago1744013651IN
Sky: MCD Join ETH A
0 ETH0.0012044315.8
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Latest 2 internal transactions

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Transfer222311382025-04-09 11:46:23318 days ago1744199183
Sky: MCD Join ETH A
0.00136344 ETH
-97552152020-03-27 19:00:382157 days ago1585335638
Sky: MCD Join ETH A
0.01 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
GemJoin

Compiler Version
v0.5.12+commit.7709ece9

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, GNU GPLv3 license
/**
 *Submitted for verification at Etherscan.io on 2019-11-14
*/

// hevm: flattened sources of /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/join.sol
pragma solidity =0.5.12;

////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/lib.sol
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* pragma solidity 0.5.12; */

contract LibNote {
    event LogNote(
        bytes4   indexed  sig,
        address  indexed  usr,
        bytes32  indexed  arg1,
        bytes32  indexed  arg2,
        bytes             data
    ) anonymous;

    modifier note {
        _;
        assembly {
            // log an 'anonymous' event with a constant 6 words of calldata
            // and four indexed topics: selector, caller, arg1 and arg2
            let mark := msize                         // end of memory ensures zero
            mstore(0x40, add(mark, 288))              // update free memory pointer
            mstore(mark, 0x20)                        // bytes type data offset
            mstore(add(mark, 0x20), 224)              // bytes size (padded)
            calldatacopy(add(mark, 0x40), 0, 224)     // bytes payload
            log4(mark, 288,                           // calldata
                 shl(224, shr(224, calldataload(0))), // msg.sig
                 caller,                              // msg.sender
                 calldataload(4),                     // arg1
                 calldataload(36)                     // arg2
                )
        }
    }
}

////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/join.sol
/// join.sol -- Basic token adapters

// Copyright (C) 2018 Rain <rainbreak@riseup.net>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity 0.5.12; */

/* import "./lib.sol"; */

contract GemLike {
    function decimals() public view returns (uint);
    function transfer(address,uint) external returns (bool);
    function transferFrom(address,address,uint) external returns (bool);
}

contract DSTokenLike {
    function mint(address,uint) external;
    function burn(address,uint) external;
}

contract VatLike {
    function slip(bytes32,address,int) external;
    function move(address,address,uint) external;
}

/*
    Here we provide *adapters* to connect the Vat to arbitrary external
    token implementations, creating a bounded context for the Vat. The
    adapters here are provided as working examples:

      - `GemJoin`: For well behaved ERC20 tokens, with simple transfer
                   semantics.

      - `ETHJoin`: For native Ether.

      - `DaiJoin`: For connecting internal Dai balances to an external
                   `DSToken` implementation.

    In practice, adapter implementations will be varied and specific to
    individual collateral types, accounting for different transfer
    semantics and token standards.

    Adapters need to implement two basic methods:

      - `join`: enter collateral into the system
      - `exit`: remove collateral from the system

*/

contract GemJoin is LibNote {
    // --- Auth ---
    mapping (address => uint) public wards;
    function rely(address usr) external note auth { wards[usr] = 1; }
    function deny(address usr) external note auth { wards[usr] = 0; }
    modifier auth {
        require(wards[msg.sender] == 1, "GemJoin/not-authorized");
        _;
    }

    VatLike public vat;
    bytes32 public ilk;
    GemLike public gem;
    uint    public dec;
    uint    public live;  // Access Flag

    constructor(address vat_, bytes32 ilk_, address gem_) public {
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike(vat_);
        ilk = ilk_;
        gem = GemLike(gem_);
        dec = gem.decimals();
    }
    function cage() external note auth {
        live = 0;
    }
    function join(address usr, uint wad) external note {
        require(live == 1, "GemJoin/not-live");
        require(int(wad) >= 0, "GemJoin/overflow");
        vat.slip(ilk, usr, int(wad));
        require(gem.transferFrom(msg.sender, address(this), wad), "GemJoin/failed-transfer");
    }
    function exit(address usr, uint wad) external note {
        require(wad <= 2 ** 255, "GemJoin/overflow");
        vat.slip(ilk, msg.sender, -int(wad));
        require(gem.transfer(usr, wad), "GemJoin/failed-transfer");
    }
}

contract ETHJoin is LibNote {
    // --- Auth ---
    mapping (address => uint) public wards;
    function rely(address usr) external note auth { wards[usr] = 1; }
    function deny(address usr) external note auth { wards[usr] = 0; }
    modifier auth {
        require(wards[msg.sender] == 1, "ETHJoin/not-authorized");
        _;
    }

    VatLike public vat;
    bytes32 public ilk;
    uint    public live;  // Access Flag

    constructor(address vat_, bytes32 ilk_) public {
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike(vat_);
        ilk = ilk_;
    }
    function cage() external note auth {
        live = 0;
    }
    function join(address usr) external payable note {
        require(live == 1, "ETHJoin/not-live");
        require(int(msg.value) >= 0, "ETHJoin/overflow");
        vat.slip(ilk, usr, int(msg.value));
    }
    function exit(address payable usr, uint wad) external note {
        require(int(wad) >= 0, "ETHJoin/overflow");
        vat.slip(ilk, msg.sender, -int(wad));
        usr.transfer(wad);
    }
}

contract DaiJoin is LibNote {
    // --- Auth ---
    mapping (address => uint) public wards;
    function rely(address usr) external note auth { wards[usr] = 1; }
    function deny(address usr) external note auth { wards[usr] = 0; }
    modifier auth {
        require(wards[msg.sender] == 1, "DaiJoin/not-authorized");
        _;
    }

    VatLike public vat;
    DSTokenLike public dai;
    uint    public live;  // Access Flag

    constructor(address vat_, address dai_) public {
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike(vat_);
        dai = DSTokenLike(dai_);
    }
    function cage() external note auth {
        live = 0;
    }
    uint constant ONE = 10 ** 27;
    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x);
    }
    function join(address usr, uint wad) external note {
        vat.move(address(this), usr, mul(ONE, wad));
        dai.burn(msg.sender, wad);
    }
    function exit(address usr, uint wad) external note {
        require(live == 1, "DaiJoin/not-live");
        vat.move(msg.sender, address(this), mul(ONE, wad));
        dai.mint(usr, wad);
    }
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"address","name":"vat_","type":"address"},{"internalType":"bytes32","name":"ilk_","type":"bytes32"},{"internalType":"address","name":"gem_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":true,"internalType":"bytes32","name":"arg1","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"arg2","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"LogNote","type":"event"},{"constant":false,"inputs":[],"name":"cage","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"dec","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"exit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"gem","outputs":[{"internalType":"contract GemLike","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"ilk","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"join","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"live","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"vat","outputs":[{"internalType":"contract VatLike","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b4554482d41000000000000000000000000000000000000000000000000000000000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : vat_ (address): 0x35D1b3F3D7966A1DFe207aa4514C12a259A0492B
Arg [1] : ilk_ (bytes32): 0x4554482d41000000000000000000000000000000000000000000000000000000
Arg [2] : gem_ (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b
Arg [1] : 4554482d41000000000000000000000000000000000000000000000000000000
Arg [2] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://bfdfa122fe3ad43a5d779b939c506cae7507e0f5e807767f61193161f1c1e286

Block Uncle Number Difficulty Gas Used Reward
View All Uncles
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OVERVIEW

Sky (formerly Maker) enables users to get rewarded for non-custodial savings.

0x2F0b23f53734252Bda2277357e97e1517d6B042A
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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.