Contract

0x2bD53Bd2341329e0cf36c55380A77a3E457028Ca

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0x790c2c86...8338C59a6 at txn 0x948ee514f267abcdd75dfae7442263739e5d6abb0a87d432025831aea2a1bd6f

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Parent Transaction Hash	Block		From		To
0x948ee514f267abcdd75dfae7442263739e5d6abb0a87d432025831aea2a1bd6f	13512656	2021-10-29 14:43:10	1179 days ago	1635518590	0x6BDeD76c...c2C187946		Contract Creation	0 ETH$0.00

Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x696866ea...559182D38
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:

Pile

Compiler Version

v0.7.6+commit.7338295f

Optimization Enabled:

No with 200 runs

Other Settings:

default evmVersion

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2021-10-12
*/

// Verified using https://dapp.tools

// hevm: flattened sources of src/borrower/pile.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.5.15 >=0.7.6;

////// lib/tinlake-auth/src/auth.sol
// Copyright (C) Centrifuge 2020, based on MakerDAO dss https://github.com/makerdao/dss
/* pragma solidity >=0.5.15; */

contract Auth {
    mapping (address => uint256) public wards;
    
    event Rely(address indexed usr);
    event Deny(address indexed usr);

    function rely(address usr) external auth {
        wards[usr] = 1;
        emit Rely(usr);
    }
    function deny(address usr) external auth {
        wards[usr] = 0;
        emit Deny(usr);
    }

    modifier auth {
        require(wards[msg.sender] == 1, "not-authorized");
        _;
    }

}

////// lib/tinlake-math/src/math.sol
// Copyright (C) 2018 Rain <[email protected]>
/* pragma solidity >=0.5.15; */

contract Math {
    uint256 constant ONE = 10 ** 27;

    function safeAdd(uint x, uint y) public pure returns (uint z) {
        require((z = x + y) >= x, "safe-add-failed");
    }

    function safeSub(uint x, uint y) public pure returns (uint z) {
        require((z = x - y) <= x, "safe-sub-failed");
    }

    function safeMul(uint x, uint y) public pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, "safe-mul-failed");
    }

    function safeDiv(uint x, uint y) public pure returns (uint z) {
        z = x / y;
    }

    function rmul(uint x, uint y) public pure returns (uint z) {
        z = safeMul(x, y) / ONE;
    }

    function rdiv(uint x, uint y) public pure returns (uint z) {
        require(y > 0, "division by zero");
        z = safeAdd(safeMul(x, ONE), y / 2) / y;
    }

    function rdivup(uint x, uint y) internal pure returns (uint z) {
        require(y > 0, "division by zero");
        // always rounds up
        z = safeAdd(safeMul(x, ONE), safeSub(y, 1)) / y;
    }


}

////// lib/tinlake-math/src/interest.sol
// Copyright (C) 2018 Rain <[email protected]> and Centrifuge, referencing MakerDAO dss => https://github.com/makerdao/dss/blob/master/src/pot.sol
/* pragma solidity >=0.5.15; */

/* import "./math.sol"; */

contract Interest is Math {
    // @notice This function provides compounding in seconds
    // @param chi Accumulated interest rate over time
    // @param ratePerSecond Interest rate accumulation per second in RAD(10ˆ27)
    // @param lastUpdated When the interest rate was last updated
    // @param pie Total sum of all amounts accumulating under one interest rate, divided by that rate
    // @return The new accumulated rate, as well as the difference between the debt calculated with the old and new accumulated rates.
    function compounding(uint chi, uint ratePerSecond, uint lastUpdated, uint pie) public view returns (uint, uint) {
        require(block.timestamp >= lastUpdated, "tinlake-math/invalid-timestamp");
        require(chi != 0);
        // instead of a interestBearingAmount we use a accumulated interest rate index (chi)
        uint updatedChi = _chargeInterest(chi ,ratePerSecond, lastUpdated, block.timestamp);
        return (updatedChi, safeSub(rmul(updatedChi, pie), rmul(chi, pie)));
    }

    // @notice This function charge interest on a interestBearingAmount
    // @param interestBearingAmount is the interest bearing amount
    // @param ratePerSecond Interest rate accumulation per second in RAD(10ˆ27)
    // @param lastUpdated last time the interest has been charged
    // @return interestBearingAmount + interest
    function chargeInterest(uint interestBearingAmount, uint ratePerSecond, uint lastUpdated) public view returns (uint) {
        if (block.timestamp >= lastUpdated) {
            interestBearingAmount = _chargeInterest(interestBearingAmount, ratePerSecond, lastUpdated, block.timestamp);
        }
        return interestBearingAmount;
    }

    function _chargeInterest(uint interestBearingAmount, uint ratePerSecond, uint lastUpdated, uint current) internal pure returns (uint) {
        return rmul(rpow(ratePerSecond, current - lastUpdated, ONE), interestBearingAmount);
    }


    // convert pie to debt/savings amount
    function toAmount(uint chi, uint pie) public pure returns (uint) {
        return rmul(pie, chi);
    }

    // convert debt/savings amount to pie
    function toPie(uint chi, uint amount) public pure returns (uint) {
        return rdivup(amount, chi);
    }

    function rpow(uint x, uint n, uint base) public pure returns (uint z) {
        assembly {
            switch x case 0 {switch n case 0 {z := base} default {z := 0}}
            default {
                switch mod(n, 2) case 0 { z := base } default { z := x }
                let half := div(base, 2)  // for rounding.
                for { n := div(n, 2) } n { n := div(n,2) } {
                let xx := mul(x, x)
                if iszero(eq(div(xx, x), x)) { revert(0,0) }
                let xxRound := add(xx, half)
                if lt(xxRound, xx) { revert(0,0) }
                x := div(xxRound, base)
                if mod(n,2) {
                    let zx := mul(z, x)
                    if and(iszero(iszero(x)), iszero(eq(div(zx, x), z))) { revert(0,0) }
                    let zxRound := add(zx, half)
                    if lt(zxRound, zx) { revert(0,0) }
                    z := div(zxRound, base)
                }
            }
            }
        }
    }
}

////// src/borrower/pile.sol
// Copyright (C) 2018  Rain <[email protected]>, Centrifuge
/* pragma solidity >=0.7.6; */

/* import "tinlake-math/interest.sol"; */
/* import "tinlake-auth/auth.sol"; */

// ## Interest Group based Pile
// The following is one implementation of a debt module. It keeps track of different buckets of interest rates and is optimized for many loans per interest bucket. It keeps track of interest
// rate accumulators (chi values) for all interest rate categories. It calculates debt each
// loan according to its interest rate category and pie value.
contract Pile is Auth, Interest {
    
    // --- Data ---

    // stores all needed information of an interest rate group
    struct Rate {
        uint   pie;                 // Total debt of all loans with this rate
        uint   chi;                 // Accumulated rates
        uint   ratePerSecond;       // Accumulation per second
        uint48 lastUpdated;         // Last time the rate was accumulated
        uint   fixedRate;           // fixed rate applied to each loan of the group
    }

    // Interest Rate Groups are identified by a `uint` and stored in a mapping
    mapping (uint => Rate) public rates;

    // mapping of all loan debts
    // the debt is stored as pie
    // pie is defined as pie = debt/chi therefore debt = pie * chi
    // where chi is the accumulated interest rate index over time
    mapping (uint => uint) public pie;
    // loan => rate
    mapping (uint => uint) public loanRates;


    // Events
    event IncreaseDebt(uint indexed loan, uint currencyAmount);
    event DecreaseDebt(uint indexed loan, uint currencyAmount);
    event SetRate(uint indexed loan, uint rate);
    event ChangeRate(uint indexed loan, uint newRate);
    event File(bytes32 indexed what, uint rate, uint value);

    constructor() {
        // pre-definition for loans without interest rates
        rates[0].chi = ONE;
        rates[0].ratePerSecond = ONE;
        
        wards[msg.sender] = 1;
        emit Rely(msg.sender);
    }

     // --- Public Debt Methods  ---
    // increases the debt of a loan by a currencyAmount
    // a change of the loan debt updates the rate debt and total debt
    function incDebt(uint loan, uint currencyAmount) external auth { 
        uint rate = loanRates[loan];
        require(block.timestamp == rates[rate].lastUpdated, "rate-group-not-updated");
        currencyAmount = safeAdd(currencyAmount, rmul(currencyAmount, rates[rate].fixedRate));
        uint pieAmount = toPie(rates[rate].chi, currencyAmount);

        pie[loan] = safeAdd(pie[loan], pieAmount);
        rates[rate].pie = safeAdd(rates[rate].pie, pieAmount);

        emit IncreaseDebt(loan, currencyAmount);
    }

    // decrease the loan's debt by a currencyAmount
    // a change of the loan debt updates the rate debt and total debt
    function decDebt(uint loan, uint currencyAmount) external auth {
        uint rate = loanRates[loan];
        require(block.timestamp == rates[rate].lastUpdated, "rate-group-not-updated");
        uint pieAmount = toPie(rates[rate].chi, currencyAmount);

        pie[loan] = safeSub(pie[loan], pieAmount);
        rates[rate].pie = safeSub(rates[rate].pie, pieAmount);

        emit DecreaseDebt(loan, currencyAmount);
    }

    // returns the current debt based on actual block.timestamp (now)
    function debt(uint loan) external view returns (uint) {
        uint rate_ = loanRates[loan];
        uint chi_ = rates[rate_].chi;
        if (block.timestamp >= rates[rate_].lastUpdated) {
            chi_ = chargeInterest(rates[rate_].chi, rates[rate_].ratePerSecond, rates[rate_].lastUpdated);
        }
        return toAmount(chi_, pie[loan]);
    }

    // returns the total debt of a interest rate group
    function rateDebt(uint rate) external view returns (uint) {
        uint chi_ = rates[rate].chi;
        uint pie_ = rates[rate].pie;

        if (block.timestamp >= rates[rate].lastUpdated) {
            chi_ = chargeInterest(rates[rate].chi, rates[rate].ratePerSecond, rates[rate].lastUpdated);
        }
        return toAmount(chi_, pie_);
    }

    // --- Interest Rate Group Implementation ---

    // set rate loanRates for a loan
    function setRate(uint loan, uint rate) external auth {
        require(pie[loan] == 0, "non-zero-debt");
        // rate category has to be initiated
        require(rates[rate].chi != 0, "rate-group-not-set");
        loanRates[loan] = rate;
        emit SetRate(loan, rate);
    }

    // change rate loanRates for a loan
    function changeRate(uint loan, uint newRate) external auth {
        require(rates[newRate].chi != 0, "rate-group-not-set");
        uint currentRate = loanRates[loan];
        drip(currentRate);
        drip(newRate);
        uint pie_ = pie[loan];
        uint debt_ = toAmount(rates[currentRate].chi, pie_);
        rates[currentRate].pie = safeSub(rates[currentRate].pie, pie_);
        pie[loan] = toPie(rates[newRate].chi, debt_);
        rates[newRate].pie = safeAdd(rates[newRate].pie, pie[loan]);
        loanRates[loan] = newRate;
        emit ChangeRate(loan, newRate);
    }

    // set/change the interest rate of a rate category
    function file(bytes32 what, uint rate, uint value) external auth {
        if (what == "rate") {
            require(value != 0, "rate-per-second-can-not-be-0");
            if (rates[rate].chi == 0) {
                rates[rate].chi = ONE;
                rates[rate].lastUpdated = uint48(block.timestamp);
            } else {
                drip(rate);
            } 
            rates[rate].ratePerSecond = value;
        } else if (what == "fixedRate") {
            rates[rate].fixedRate = value;
        } else revert("unknown parameter");

        emit File(what, rate, value);
    }

    // accrue needs to be called before any debt amounts are modified by an external component
    function accrue(uint loan) external {
        drip(loanRates[loan]);
    }

    // drip updates the chi of the rate category by compounding the interest and
    // updates the total debt
    function drip(uint rate) public {        
        if (block.timestamp >= rates[rate].lastUpdated) {
            (uint chi,) = compounding(rates[rate].chi, rates[rate].ratePerSecond, rates[rate].lastUpdated, rates[rate].pie);
            rates[rate].chi = chi;
            rates[rate].lastUpdated = uint48(block.timestamp);
        }
    }
}

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Contract ABI

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Deployed Bytecode

Decompile Bytecode

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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.

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