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0x020eb84309243Ed4B8E6C197AF145125dDE4AFDa
 

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0x60806040148823572022-06-01 2:33:39906 days ago1654050819IN
 Create: UFragments
0 ETH0.0893089260

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Contract Source Code Verified (Exact Match)

Contract Name:
UFragments

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-06-01
*/

// SPDX-License-Identifier: NONE

pragma solidity 0.4.24;



// Part: IERC20

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
    external returns (bool);

  function transferFrom(address from, address to, uint256 value)
    external returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

// Part: Initializable

/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
contract Initializable {

  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool wasInitializing = initializing;
    initializing = true;
    initialized = true;

    _;

    initializing = wasInitializing;
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    uint256 cs;
    assembly { cs := extcodesize(address) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// Part: SafeMath

/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

// Part: SafeMathInt

/**
 * @title SafeMathInt
 * @dev Math operations for int256 with overflow safety checks.
 */
library SafeMathInt {
    int256 private constant MIN_INT256 = int256(1) << 255;
    int256 private constant MAX_INT256 = ~(int256(1) << 255);

    /**
     * @dev Multiplies two int256 variables and fails on overflow.
     */
    function mul(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        int256 c = a * b;

        // Detect overflow when multiplying MIN_INT256 with -1
        require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));
        require((b == 0) || (c / b == a));
        return c;
    }

    /**
     * @dev Division of two int256 variables and fails on overflow.
     */
    function div(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        // Prevent overflow when dividing MIN_INT256 by -1
        require(b != -1 || a != MIN_INT256);

        // Solidity already throws when dividing by 0.
        return a / b;
    }

    /**
     * @dev Subtracts two int256 variables and fails on overflow.
     */
    function sub(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a));
        return c;
    }

    /**
     * @dev Adds two int256 variables and fails on overflow.
     */
    function add(int256 a, int256 b)
        internal
        pure
        returns (int256)
    {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a));
        return c;
    }

    /**
     * @dev Converts to absolute value, and fails on overflow.
     */
    function abs(int256 a)
        internal
        pure
        returns (int256)
    {
        require(a != MIN_INT256);
        return a < 0 ? -a : a;
    }
}

// Part: ERC20Detailed

/**
 * @title ERC20Detailed token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract ERC20Detailed is Initializable, IERC20 {
  string private _name;
  string private _symbol;
  uint8 private _decimals;

  function initialize(string name, string symbol, uint8 decimals) public initializer {
    _name = name;
    _symbol = symbol;
    _decimals = decimals;
  }

  /**
   * @return the name of the token.
   */
  function name() public view returns(string) {
    return _name;
  }

  /**
   * @return the symbol of the token.
   */
  function symbol() public view returns(string) {
    return _symbol;
  }

  /**
   * @return the number of decimals of the token.
   */
  function decimals() public view returns(uint8) {
    return _decimals;
  }

  uint256[50] private ______gap;
}

// Part: Ownable

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable is Initializable {
  address private _owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function initialize(address sender) public initializer {
    _owner = sender;
  }

  /**
   * @return the address of the owner.
   */
  function owner() public view returns(address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(isOwner());
    _;
  }

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(_owner);
    _owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0));
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }

  uint256[50] private ______gap;
}

// Part: SafeERC20

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
  function safeTransfer(
    IERC20 token,
    address to,
    uint256 value
  )
    internal
  {
    require(token.transfer(to, value));
  }

  function safeTransferFrom(
    IERC20 token,
    address from,
    address to,
    uint256 value
  )
    internal
  {
    require(token.transferFrom(from, to, value));
  }

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  )
    internal
  {
    require(token.approve(spender, value));
  }
}

// File: UFragments.sol

/**
 * @title uFragments ERC20 token
 * @dev This is part of an implementation of the uFragments Ideal Money protocol.
 *      uFragments is a normal ERC20 token, but its supply can be adjusted by splitting and
 *      combining tokens proportionally across all wallets.
 *
 *      uFragment balances are internally represented with a hidden denomination, 'shares'.
 *      We support splitting the currency in expansion and combining the currency on contraction by
 *      changing the exchange rate between the hidden 'shares' and the public 'fragments'.
 */

contract UFragments is ERC20Detailed, Ownable {
    // PLEASE READ BEFORE CHANGING ANY ACCOUNTING OR MATH
    // Anytime there is division, there is a risk of numerical instability from rounding errors. In
    // order to minimize this risk, we adhere to the following guidelines:
    // 1) The conversion rate adopted is the number of shares that equals 1 fragment.
    //    The inverse rate must not be used--TOTAL_SHARES is always the numerator and _totalSupply is
    //    always the denominator. (i.e. If you want to convert shares to fragments instead of
    //    multiplying by the inverse rate, you should divide by the normal rate)
    // 2) Share balances converted into Fragments are always rounded down (truncated).
    //
    // We make the following guarantees:
    // - If address 'A' transfers x Fragments to address 'B'. A's resulting external balance will
    //   be decreased by precisely x Fragments, and B's external balance will be precisely
    //   increased by x Fragments.
    //
    // We do not guarantee that the sum of all balances equals the result of calling totalSupply().
    // This is because, for any conversion function 'f()' that has non-zero rounding error,
    // f(x0) + f(x1) + ... + f(xn) is not always equal to f(x0 + x1 + ... xn).
    using SafeMath for uint256;
    using SafeMathInt for int256;
    using SafeERC20 for IERC20;

    event LogRebase(uint256 indexed epoch, uint256 totalSupply);
    event LogMonetaryPolicyUpdated(address monetaryPolicy);
    event RebaseToggled(bool rebasePaused);

    // Used for authentication
    address public monetaryPolicy;
    uint256 public rebaseStartTime;

    modifier onlyMonetaryPolicy() {
        require(msg.sender == monetaryPolicy);
        _;
    }

    // Reactivated rebasePaused flag per BIP92 (https://forum.badger.finance/t/bip-92-digg-restructuring-v3-revised/5653)
    bool private rebasePaused;
    bool private tokenPausedDeprecated;

    modifier validRecipient(address to) {
        require(to != address(0x0));
        require(to != address(this));
        _;
    }

    modifier onlyAfterRebaseStart() {
        require(now >= rebaseStartTime);
        _;
    }

    uint256 private constant DECIMALS = 9;
    uint256 private constant SCALED_SHARES_EXTRA_DECIMALS = 9;
    uint256 private constant MAX_UINT256 = ~uint256(0);
    uint256 private constant MAX_UINT128 = ~uint128(0);
    uint256 private constant MAX_FRAGMENTS_SUPPLY = 4000 * 10**DECIMALS;

    // TOTAL_SHARES is a multiple of MAX_FRAGMENTS_SUPPLY so that _sharesPerFragment is an integer.
    // Use the highest value that fits in a uint128 for sufficient granularity.
    uint256 private constant TOTAL_SHARES = MAX_UINT256 - (MAX_UINT256 % MAX_FRAGMENTS_SUPPLY);

    // MAX_SUPPLY = maximum integer < (sqrt(4*TOTAL_SHARES + 1) - 1) / 2
    uint256 private constant MAX_SUPPLY = MAX_UINT128;

    uint256 private _totalSupply;
    uint256 public _sharesPerFragment;
    uint256 public _initialSharesPerFragment;
    mapping(address => uint256) private _shareBalances;

    // This is denominated in Fragments, because the shares-fragments conversion might change before
    // it's fully paid.
    mapping(address => mapping(address => uint256)) private _allowedFragments;

    // Data for minting remDIGG
    address private constant TREASURY_OPS_MSIG = 0x042B32Ac6b453485e357938bdC38e0340d4b9276;
    uint256 private constant MINT_AMOUNT = 52942035500;
    bool private remDiggMint;

    /**
     * @param monetaryPolicy_ The address of the monetary policy contract to use for authentication.
     */
    function setMonetaryPolicy(address monetaryPolicy_) external onlyOwner {
        monetaryPolicy = monetaryPolicy_;
        emit LogMonetaryPolicyUpdated(monetaryPolicy_);
    }

    /**
     * @dev Notifies Fragments contract about a new rebase cycle.
     * @param supplyDelta The number of new fragment tokens to add into circulation via expansion.
     * @return The total number of fragments after the supply adjustment.
     */
    function rebase(uint256 epoch, int256 supplyDelta) external onlyMonetaryPolicy onlyAfterRebaseStart returns (uint256) {
        require(!rebasePaused, "Rebase paused");

        if (supplyDelta == 0) {
            emit LogRebase(epoch, _totalSupply);
            return _totalSupply;
        }

        if (supplyDelta < 0) {
            _totalSupply = _totalSupply.sub(uint256(supplyDelta.abs()));
        } else {
            _totalSupply = _totalSupply.add(uint256(supplyDelta));
        }

        if (_totalSupply > MAX_SUPPLY) {
            _totalSupply = MAX_SUPPLY;
        }

        _sharesPerFragment = TOTAL_SHARES.div(_totalSupply);

        // From this point forward, _sharesPerFragment is taken as the source of truth.
        // We recalculate a new _totalSupply to be in agreement with the _sharesPerFragment
        // conversion rate.
        // This means our applied supplyDelta can deviate from the requested supplyDelta,
        // but this deviation is guaranteed to be < (_totalSupply^2)/(TOTAL_SHARES - _totalSupply).
        //
        // In the case of _totalSupply <= MAX_UINT128 (our current supply cap), this
        // deviation is guaranteed to be < 1, so we can omit this step. If the supply cap is
        // ever increased, it must be re-included.
        // NB: Digg will likely never reach the total supply cap as the total supply of BTC is
        // currently 21 million and MAX_UINT128 is many orders of magnitude greater.
        // _totalSupply = TOTAL_SHARES.div(_sharesPerFragment)

        emit LogRebase(epoch, _totalSupply);
        return _totalSupply;
    }

    function initialize(address owner_) public initializer {
        ERC20Detailed.initialize("Digg", "DIGG", uint8(DECIMALS));
        Ownable.initialize(owner_);

        rebaseStartTime = 0;
        rebasePaused = true;
        tokenPausedDeprecated = false;

        _totalSupply = MAX_FRAGMENTS_SUPPLY;
        _shareBalances[owner_] = TOTAL_SHARES;
        _sharesPerFragment = TOTAL_SHARES.div(_totalSupply);
        _initialSharesPerFragment = TOTAL_SHARES.div(_totalSupply);

        emit Transfer(address(0x0), owner_, _totalSupply);
    }

    /**
     * @return The total number of fragments.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @return The total number of underlying shares.
     */
    function totalShares() public view returns (uint256) {
        return TOTAL_SHARES;
    }

    /**
     * @param who The address to query.
     * @return The balance of the specified address.
     */
    function balanceOf(address who) public view returns (uint256) {
        return _shareBalances[who].div(_sharesPerFragment);
    }

    /**
     * @param who The address to query.
     * @return The underlying shares of the specified address.
     */
    function sharesOf(address who) public view returns (uint256) {
        return _shareBalances[who];
    }

    /**
     * @param fragments Fragment value to convert.
     * @return The underlying share value of the specified fragment amount.
     */
    function fragmentsToShares(uint256 fragments) public view returns (uint256) {
        return fragments.mul(_sharesPerFragment);
    }

    /**
     * @param shares Share value to convert.
     * @return The current fragment value of the specified underlying share amount.
     */
    function sharesToFragments(uint256 shares) public view returns (uint256) {
        if (shares == 0) {
            return 0;
        }
        return shares.div(_sharesPerFragment);
    }

    /// @dev Scaled Shares are a user-friendly representation of shares
    function scaledSharesToShares(uint256 fragments) public view returns (uint256) {
        return fragments.mul(_initialSharesPerFragment).mul(10**SCALED_SHARES_EXTRA_DECIMALS);
    }

    function sharesToScaledShares(uint256 shares) public view returns (uint256) {
        if (shares == 0) {
            return 0;
        }
        return shares.div(_initialSharesPerFragment).mul(10**SCALED_SHARES_EXTRA_DECIMALS);
    }

    /**
     * @dev Transfer tokens to a specified address.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     * @return True on success, false otherwise.
     */
    function transfer(address to, uint256 value) public validRecipient(to) returns (bool) {
        uint256 shareValue = value.mul(_sharesPerFragment);
        _shareBalances[msg.sender] = _shareBalances[msg.sender].sub(shareValue);
        _shareBalances[to] = _shareBalances[to].add(shareValue);
        emit Transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Function to check the amount of tokens that an owner has allowed to a spender.
     * @param owner_ The address which owns the funds.
     * @param spender The address which will spend the funds.
     * @return The number of tokens still available for the spender.
     */
    function allowance(address owner_, address spender) public view returns (uint256) {
        return _allowedFragments[owner_][spender];
    }

    /**
     * @dev Transfer tokens from one address to another.
     * @param from The address you want to send tokens from.
     * @param to The address you want to transfer to.
     * @param value The amount of tokens to be transferred.
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) public validRecipient(to) returns (bool) {
        _allowedFragments[from][msg.sender] = _allowedFragments[from][msg.sender].sub(value);

        uint256 shareValue = value.mul(_sharesPerFragment);
        _shareBalances[from] = _shareBalances[from].sub(shareValue);
        _shareBalances[to] = _shareBalances[to].add(shareValue);
        emit Transfer(from, to, value);

        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of
     * msg.sender. This method is included for ERC20 compatibility.
     * increaseAllowance and decreaseAllowance should be used instead.
     * Changing an allowance with this method brings the risk that someone may transfer both
     * the old and the new allowance - if they are both greater than zero - if a transfer
     * transaction is mined before the later approve() call is mined.
     *
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _allowedFragments[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner has allowed to a spender.
     * This method should be used instead of approve() to avoid the double approval vulnerability
     * described above.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _allowedFragments[msg.sender][spender] = _allowedFragments[msg.sender][spender].add(addedValue);
        emit Approval(msg.sender, spender, _allowedFragments[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner has allowed to a spender.
     *
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        uint256 oldValue = _allowedFragments[msg.sender][spender];
        if (subtractedValue >= oldValue) {
            _allowedFragments[msg.sender][spender] = 0;
        } else {
            _allowedFragments[msg.sender][spender] = oldValue.sub(subtractedValue);
        }
        emit Approval(msg.sender, spender, _allowedFragments[msg.sender][spender]);
        return true;
    }

    /**
     * @notice Mints the reimbursement for remDIGG one time, directly to dev multisig
     * @dev This is implemented to address BIP92 (https://forum.badger.finance/t/bip-92-digg-restructuring-v3-revised/5653)
     * @dev by allowing the development multisig a one time mint of the totalSupply of remDIGG for distribution
     */
    function oneTimeMint() external onlyOwner {
        require(!remDiggMint, "Mint already complete");
        uint256 shareValue = MINT_AMOUNT.mul(_sharesPerFragment);
        _shareBalances[TREASURY_OPS_MSIG] = _shareBalances[TREASURY_OPS_MSIG].add(shareValue);
        _totalSupply = _totalSupply.add(MINT_AMOUNT);
        remDiggMint = true;
        emit Transfer(address(0x0), TREASURY_OPS_MSIG, MINT_AMOUNT);
    }

    /**
     * @notice Sweep unprotected tokens to the owner contract to recover them from the contract
     * @param _token token to sweep from the contract
     * @dev this contract should never hold any tokens so there are no protected tokens
     */
    function sweep(IERC20 _token) external onlyOwner {
        require(_token.balanceOf(address(this)) > 0, "No balance to sweep");
        _token.safeTransfer(owner(), _token.balanceOf(address(this)));
    }

    /// @notice Toggle rebase functionality
    function toggleRebase() external onlyOwner {
        rebasePaused = !rebasePaused;
        emit RebaseToggled(rebasePaused);
    }
}

Contract Security Audit

Contract ABI

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","type":"function"},{"constant":false,"inputs":[],"name":"oneTimeMint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"who","type":"address"}],"name":"sharesOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"fragments","type":"uint256"}],"name":"scaledSharesToShares","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"epoch","type":"uint256"},{"indexed":false,"name":"totalSupply","type":"uint256"}],"name":"LogRebase","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"monetaryPolicy","type":"address"}],"name":"LogMonetaryPolicyUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"rebasePaused","type":"bool"}],"name":"RebaseToggled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"}],"name":"OwnershipRenounced","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]

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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.