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1 address found via
Transaction Hash
Method
Block
From
To
Exit140689832022-01-24 14:58:501497 days ago1643036330IN
Sky: MCD Join LINK A
0 ETH0.0076909194.33810237
Exit132729752021-09-22 2:49:181621 days ago1632278958IN
Sky: MCD Join LINK A
0 ETH0.0056239268.99425361
Join128774292021-07-22 17:05:551683 days ago1626973555IN
Sky: MCD Join LINK A
0 ETH0.0032268136.3
Exit124636972021-05-19 8:19:301747 days ago1621412370IN
Sky: MCD Join LINK A
0 ETH0.00823281101
Exit123479072021-05-01 11:05:111765 days ago1619867111IN
Sky: MCD Join LINK A
0 ETH0.0016306233
Join123435412021-04-30 18:52:491766 days ago1619808769IN
Sky: MCD Join LINK A
0 ETH0.0064918173
Join123433612021-04-30 18:11:421766 days ago1619806302IN
Sky: MCD Join LINK A
0 ETH0.0072892282
Join123432712021-04-30 17:53:591766 days ago1619805239IN
Sky: MCD Join LINK A
0 ETH0.0606264582
Exit123248262021-04-27 21:15:571769 days ago1619558157IN
Sky: MCD Join LINK A
0 ETH0.0045353668.2
Exit123185882021-04-26 22:13:521770 days ago1619475232IN
Sky: MCD Join LINK A
0 ETH0.0051692377.71761962
Exit123176302021-04-26 18:35:481770 days ago1619462148IN
Sky: MCD Join LINK A
0 ETH0.0039907860
Exit123175632021-04-26 18:23:501770 days ago1619461430IN
Sky: MCD Join LINK A
0 ETH0.0043225665
Exit122960772021-04-23 11:05:261773 days ago1619175926IN
Sky: MCD Join LINK A
0 ETH0.0093448140.52133333
Exit122632402021-04-18 9:17:561778 days ago1618737476IN
Sky: MCD Join LINK A
0 ETH0.01303824160
Exit119486532021-02-28 22:54:581827 days ago1614552898IN
Sky: MCD Join LINK A
0 ETH0.0077701105
Exit116367932021-01-12 0:08:591875 days ago1610410139IN
Sky: MCD Join LINK A
0 ETH0.00589173133.9
Exit116367722021-01-12 0:04:091875 days ago1610409849IN
Sky: MCD Join LINK A
0 ETH0.00813033137.8
Exit109672192020-10-01 1:22:051977 days ago1601515325IN
Sky: MCD Join LINK A
0 ETH0.00598148101.4
Deny109507632020-09-28 11:40:071980 days ago1601293207IN
Sky: MCD Join LINK A
0 ETH0.00240123141
Rely109324082020-09-25 14:40:481983 days ago1601044848IN
Sky: MCD Join LINK A
0 ETH0.00508042108

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xA6EA3b9C...ca44C0ef9
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
GemJoin

Compiler Version
v0.5.12+commit.7709ece9

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, GNU AGPLv3 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-07-22
*/

/// join.sol -- Basic token adapters

// Copyright (C) 2018 Rain <[email protected]>
//
// 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;

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
                )
        }
    }
}

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

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

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;   // CDP Engine
    bytes32 public ilk;   // Collateral Type
    GemLike public gem;
    uint    public dec;
    uint    public live;  // Active 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 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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Swarm Source

bzzr://bf630fa66d49c7cfdc69393b31371fe797bbf91a672066168ebc8a0c1689cdf9

Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

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

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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.