ETH Price: $3,547.71 (+0.97%)
Gas: 33 Gwei

Contract

0x3ff33d9162aD47660083D7DC4bC02Fb231c81677
 
Transaction Hash
Method
Block
From
To
Value
Exit163257012023-01-03 10:36:23450 days ago1672742183IN
Maker: MCD Join YFI A
0 ETH0.0004424813
Exit124912362021-05-23 14:59:421040 days ago1621781982IN
Maker: MCD Join YFI A
0 ETH0.01583556195
Exit124911042021-05-23 14:29:091040 days ago1621780149IN
Maker: MCD Join YFI A
0 ETH0.0203832251
Exit123379042021-04-29 21:47:491064 days ago1619732869IN
Maker: MCD Join YFI A
0 ETH0.0038356557.93333333
Exit119487032021-02-28 23:05:541123 days ago1614553554IN
Maker: MCD Join YFI A
0 ETH0.01572054267.82989163
Exit119151622021-02-23 19:06:131129 days ago1614107173IN
Maker: MCD Join YFI A
0 ETH0.0171744292.59923333
Exit119148862021-02-23 18:05:511129 days ago1614103551IN
Maker: MCD Join YFI A
0 ETH0.01635466278.63333333
Exit119147502021-02-23 17:36:171129 days ago1614101777IN
Maker: MCD Join YFI A
0 ETH0.02129814289
Exit117401972021-01-27 21:08:191156 days ago1611781699IN
Maker: MCD Join YFI A
0 ETH0.00656087111.8
Exit117035802021-01-22 6:03:131161 days ago1611295393IN
Maker: MCD Join YFI A
0 ETH0.00694231118.3
Exit115148722020-12-24 7:13:431190 days ago1608794023IN
Maker: MCD Join YFI A
0 ETH0.0038878789
Exit115148652020-12-24 7:12:221190 days ago1608793942IN
Maker: MCD Join YFI A
0 ETH0.0064831388
Exit115148462020-12-24 7:07:441190 days ago1608793664IN
Maker: MCD Join YFI A
0 ETH0.0052826490
Exit114988302020-12-21 20:11:421193 days ago1608581502IN
Maker: MCD Join YFI A
0 ETH0.0019369633
Exit114988292020-12-21 20:11:351193 days ago1608581495IN
Maker: MCD Join YFI A
0 ETH0.0019369633
Exit113355282020-11-26 17:59:211218 days ago1606413561IN
Maker: MCD Join YFI A
0 ETH0.00675004115
Deny111986262020-11-05 17:43:551239 days ago1604598235IN
Maker: MCD Join YFI A
0 ETH0.0009025953
Rely111982702020-11-05 16:22:361239 days ago1604593356IN
Maker: MCD Join YFI A
0 ETH0.0045629797
0x60806040111980612020-11-05 15:38:061239 days ago1604590686IN
 Create: GemJoin
0 ETH0.11072331119

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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 AGPLv3 license
/**
 *Submitted for verification at Etherscan.io on 2020-11-05
*/

// SPDX-License-Identifier: AGPL-3.0-or-later

/// 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;
}

/*
    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;   // 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

[{"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)

00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b5946492d410000000000000000000000000000000000000000000000000000000000000000000000000000000bc529c00c6401aef6d220be8c6ea1667f6ad93e

-----Decoded View---------------
Arg [0] : vat_ (address): 0x35D1b3F3D7966A1DFe207aa4514C12a259A0492B
Arg [1] : ilk_ (bytes32): 0x5946492d41000000000000000000000000000000000000000000000000000000
Arg [2] : gem_ (address): 0x0bc529c00C6401aEF6D220BE8C6Ea1667F6Ad93e

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b
Arg [1] : 5946492d41000000000000000000000000000000000000000000000000000000
Arg [2] : 0000000000000000000000000bc529c00c6401aef6d220be8c6ea1667f6ad93e


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://cc9c7173fc90ce48837710184407b020682668282bc099d2446f3c79858e1c68

Block Transaction Difficulty Gas Used Reward
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Txn 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.