Address Details
contract

0x029d8a20D86157F47CcbEE5209DEe0591dD2eB70

Contract Name
BlockchainParameters
Creator
0x456f41–3584da at 0x5f5a8c–2ab9e5
Balance
0 CELO ( )
Locked CELO Balance
0.00 CELO
Voting CELO Balance
0.00 CELO
Pending Unlocked Gold
0.00 CELO
Tokens
Fetching tokens...
Transactions
0 Transactions
Transfers
0 Transfers
Gas Used
Fetching gas used...
Last Balance Update
19874117
Contract is not verified. However, we found a verified contract with the same bytecode in Blockscout DB 0x43ae1b8704ebe546d6d243b4e6e4fbf3ad9fd76c.
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Contract name:
BlockchainParameters




Optimization enabled
false
Compiler version
v0.5.13+commit.5b0b510c




Verified at
2023-09-14T12:33:59.041790Z

project:/contracts/governance/BlockchainParameters.sol

pragma solidity ^0.5.13;

import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
import "../common/Initializable.sol";
import "../common/UsingPrecompiles.sol";

/**
 * @title Contract for storing blockchain parameters that can be set by governance.
 */
contract BlockchainParameters is Ownable, Initializable, UsingPrecompiles {
  using SafeMath for uint256;

  // obsolete
  struct ClientVersion {
    uint256 major;
    uint256 minor;
    uint256 patch;
  }

  struct LookbackWindow {
    // Value for lookbackWindow before `nextValueActivationBlock`
    uint256 oldValue;
    // Value for lookbackWindow after `nextValueActivationBlock`
    uint256 nextValue;
    // Epoch where next value is activated
    uint256 nextValueActivationEpoch;
  }

  ClientVersion private minimumClientVersion; // obsolete
  uint256 public blockGasLimit;
  uint256 public intrinsicGasForAlternativeFeeCurrency;
  LookbackWindow public uptimeLookbackWindow;

  event IntrinsicGasForAlternativeFeeCurrencySet(uint256 gas);
  event BlockGasLimitSet(uint256 limit);
  event UptimeLookbackWindowSet(uint256 window, uint256 activationEpoch);

  /**
   * @notice Sets initialized == true on implementation contracts
   * @param test Set to true to skip implementation initialization
   */
  constructor(bool test) public Initializable(test) {}

  /**
   * @notice Used in place of the constructor to allow the contract to be upgradable via proxy.
   * @param _gasForNonGoldCurrencies Intrinsic gas for non-gold gas currencies.
   * @param gasLimit Block gas limit.
   * @param lookbackWindow Lookback window for measuring validator uptime.
   */
  function initialize(uint256 _gasForNonGoldCurrencies, uint256 gasLimit, uint256 lookbackWindow)
    external
    initializer
  {
    _transferOwnership(msg.sender);
    setBlockGasLimit(gasLimit);
    setIntrinsicGasForAlternativeFeeCurrency(_gasForNonGoldCurrencies);
    setUptimeLookbackWindow(lookbackWindow);
  }

  /**
   * @notice Returns the storage, major, minor, and patch version of the contract.
   * @return Storage version of the contract.
   * @return Major version of the contract.
   * @return Minor version of the contract.
   * @return Patch version of the contract.
   */
  function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256) {
    return (1, 3, 0, 0);
  }

  /**
   * @notice Sets the block gas limit.
   * @param gasLimit New block gas limit.
   */
  function setBlockGasLimit(uint256 gasLimit) public onlyOwner {
    blockGasLimit = gasLimit;
    emit BlockGasLimitSet(gasLimit);
  }

  /**
   * @notice Sets the intrinsic gas for non-gold gas currencies.
   * @param gas Intrinsic gas for non-gold gas currencies.
   */
  function setIntrinsicGasForAlternativeFeeCurrency(uint256 gas) public onlyOwner {
    intrinsicGasForAlternativeFeeCurrency = gas;
    emit IntrinsicGasForAlternativeFeeCurrencySet(gas);
  }

  /**
   * @notice Sets the uptime lookback window.
   * @param window New window.
   */
  function setUptimeLookbackWindow(uint256 window) public onlyOwner {
    require(window >= 3 && window <= 720, "UptimeLookbackWindow must be within safe range");
    require(
      window <= getEpochSize().sub(2),
      "UptimeLookbackWindow must be smaller or equal to epochSize - 2"
    );

    uptimeLookbackWindow.oldValue = _getUptimeLookbackWindow();

    // changes only take place on the next epoch
    uptimeLookbackWindow.nextValueActivationEpoch = getEpochNumber().add(1);
    uptimeLookbackWindow.nextValue = window;

    emit UptimeLookbackWindowSet(window, uptimeLookbackWindow.nextValueActivationEpoch);
  }

  /**
   * @notice Gets the uptime lookback window.
   */
  function getUptimeLookbackWindow() public view returns (uint256 lookbackWindow) {
    lookbackWindow = _getUptimeLookbackWindow();
    require(lookbackWindow != 0, "UptimeLookbackWindow is not initialized");
  }

  /**
   * @notice Gets the uptime lookback window.
   */
  function _getUptimeLookbackWindow() internal view returns (uint256 lookbackWindow) {
    if (getEpochNumber() >= uptimeLookbackWindow.nextValueActivationEpoch) {
      return uptimeLookbackWindow.nextValue;
    } else {
      return uptimeLookbackWindow.oldValue;
    }
  }

}

/contracts/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot 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-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/contracts/common/Initializable.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.5.13 <0.9.0;

contract Initializable {
  bool public initialized;

  constructor(bool testingDeployment) public {
    if (!testingDeployment) {
      initialized = true;
    }
  }

  modifier initializer() {
    require(!initialized, "contract already initialized");
    initialized = true;
    _;
  }
}

/contracts/common/UsingPrecompiles.sol

pragma solidity ^0.5.13;

import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "../common/interfaces/ICeloVersionedContract.sol";

contract UsingPrecompiles {
  using SafeMath for uint256;

  address constant TRANSFER = address(0xff - 2);
  address constant FRACTION_MUL = address(0xff - 3);
  address constant PROOF_OF_POSSESSION = address(0xff - 4);
  address constant GET_VALIDATOR = address(0xff - 5);
  address constant NUMBER_VALIDATORS = address(0xff - 6);
  address constant EPOCH_SIZE = address(0xff - 7);
  address constant BLOCK_NUMBER_FROM_HEADER = address(0xff - 8);
  address constant HASH_HEADER = address(0xff - 9);
  address constant GET_PARENT_SEAL_BITMAP = address(0xff - 10);
  address constant GET_VERIFIED_SEAL_BITMAP = address(0xff - 11);

  /**
   * @notice calculate a * b^x for fractions a, b to `decimals` precision
   * @param aNumerator Numerator of first fraction
   * @param aDenominator Denominator of first fraction
   * @param bNumerator Numerator of exponentiated fraction
   * @param bDenominator Denominator of exponentiated fraction
   * @param exponent exponent to raise b to
   * @param _decimals precision
   * @return Numerator of the computed quantity (not reduced).
   * @return Denominator of the computed quantity (not reduced).
   */
  function fractionMulExp(
    uint256 aNumerator,
    uint256 aDenominator,
    uint256 bNumerator,
    uint256 bDenominator,
    uint256 exponent,
    uint256 _decimals
  ) public view returns (uint256, uint256) {
    require(aDenominator != 0 && bDenominator != 0, "a denominator is zero");
    uint256 returnNumerator;
    uint256 returnDenominator;
    bool success;
    bytes memory out;
    (success, out) = FRACTION_MUL.staticcall(
      abi.encodePacked(aNumerator, aDenominator, bNumerator, bDenominator, exponent, _decimals)
    );
    require(success, "error calling fractionMulExp precompile");
    returnNumerator = getUint256FromBytes(out, 0);
    returnDenominator = getUint256FromBytes(out, 32);
    return (returnNumerator, returnDenominator);
  }

  /**
   * @notice Returns the current epoch size in blocks.
   * @return The current epoch size in blocks.
   */
  function getEpochSize() public view returns (uint256) {
    bytes memory out;
    bool success;
    (success, out) = EPOCH_SIZE.staticcall(abi.encodePacked());
    require(success, "error calling getEpochSize precompile");
    return getUint256FromBytes(out, 0);
  }

  /**
   * @notice Returns the epoch number at a block.
   * @param blockNumber Block number where epoch number is calculated.
   * @return Epoch number.
   */
  function getEpochNumberOfBlock(uint256 blockNumber) public view returns (uint256) {
    return epochNumberOfBlock(blockNumber, getEpochSize());
  }

  /**
   * @notice Returns the epoch number at a block.
   * @return Current epoch number.
   */
  function getEpochNumber() public view returns (uint256) {
    return getEpochNumberOfBlock(block.number);
  }

  /**
   * @notice Returns the epoch number at a block.
   * @param blockNumber Block number where epoch number is calculated.
   * @param epochSize The epoch size in blocks.
   * @return Epoch number.
   */
  function epochNumberOfBlock(uint256 blockNumber, uint256 epochSize)
    internal
    pure
    returns (uint256)
  {
    // Follows GetEpochNumber from celo-blockchain/blob/master/consensus/istanbul/utils.go
    uint256 epochNumber = blockNumber / epochSize;
    if (blockNumber % epochSize == 0) {
      return epochNumber;
    } else {
      return epochNumber.add(1);
    }
  }

  /**
   * @notice Gets a validator address from the current validator set.
   * @param index Index of requested validator in the validator set.
   * @return Address of validator at the requested index.
   */
  // TODO: (soloseng) add to precompiles
  function validatorSignerAddressFromCurrentSet(uint256 index) public view returns (address) {
    bytes memory out;
    bool success;
    (success, out) = GET_VALIDATOR.staticcall(abi.encodePacked(index, uint256(block.number)));
    require(success, "error calling validatorSignerAddressFromCurrentSet precompile");
    return address(getUint256FromBytes(out, 0));
  }

  /**
   * @notice Gets a validator address from the validator set at the given block number.
   * @param index Index of requested validator in the validator set.
   * @param blockNumber Block number to retrieve the validator set from.
   * @return Address of validator at the requested index.
   */
  function validatorSignerAddressFromSet(uint256 index, uint256 blockNumber)
    public
    view
    returns (address)
  {
    bytes memory out;
    bool success;
    (success, out) = GET_VALIDATOR.staticcall(abi.encodePacked(index, blockNumber));
    require(success, "error calling validatorSignerAddressFromSet precompile");
    return address(getUint256FromBytes(out, 0));
  }

  /**
   * @notice Gets the size of the current elected validator set.
   * @return Size of the current elected validator set.
   */
  // TODO:(soloseng) add to precompiles.
  function numberValidatorsInCurrentSet() public view returns (uint256) {
    bytes memory out;
    bool success;
    (success, out) = NUMBER_VALIDATORS.staticcall(abi.encodePacked(uint256(block.number)));
    require(success, "error calling numberValidatorsInCurrentSet precompile");
    return getUint256FromBytes(out, 0);
  }

  /**
   * @notice Gets the size of the validator set that must sign the given block number.
   * @param blockNumber Block number to retrieve the validator set from.
   * @return Size of the validator set.
   */
  function numberValidatorsInSet(uint256 blockNumber) public view returns (uint256) {
    bytes memory out;
    bool success;
    (success, out) = NUMBER_VALIDATORS.staticcall(abi.encodePacked(blockNumber));
    require(success, "error calling numberValidatorsInSet precompile");
    return getUint256FromBytes(out, 0);
  }

  /**
   * @notice Checks a BLS proof of possession.
   * @param sender The address signed by the BLS key to generate the proof of possession.
   * @param blsKey The BLS public key that the validator is using for consensus, should pass proof
   *   of possession. 48 bytes.
   * @param blsPop The BLS public key proof-of-possession, which consists of a signature on the
   *   account address. 96 bytes.
   * @return True upon success.
   */
  function checkProofOfPossession(address sender, bytes memory blsKey, bytes memory blsPop)
    public
    view
    returns (bool)
  {
    bool success;
    (success, ) = PROOF_OF_POSSESSION.staticcall(abi.encodePacked(sender, blsKey, blsPop));
    return success;
  }

  /**
   * @notice Parses block number out of header.
   * @param header RLP encoded header
   * @return Block number.
   */
  function getBlockNumberFromHeader(bytes memory header) public view returns (uint256) {
    bytes memory out;
    bool success;
    (success, out) = BLOCK_NUMBER_FROM_HEADER.staticcall(abi.encodePacked(header));
    require(success, "error calling getBlockNumberFromHeader precompile");
    return getUint256FromBytes(out, 0);
  }

  /**
   * @notice Computes hash of header.
   * @param header RLP encoded header
   * @return Header hash.
   */
  function hashHeader(bytes memory header) public view returns (bytes32) {
    bytes memory out;
    bool success;
    (success, out) = HASH_HEADER.staticcall(abi.encodePacked(header));
    require(success, "error calling hashHeader precompile");
    return getBytes32FromBytes(out, 0);
  }

  /**
   * @notice Gets the parent seal bitmap from the header at the given block number.
   * @param blockNumber Block number to retrieve. Must be within 4 epochs of the current number.
   * @return Bitmap parent seal with set bits at indices corresponding to signing validators.
   */
  function getParentSealBitmap(uint256 blockNumber) public view returns (bytes32) {
    bytes memory out;
    bool success;
    (success, out) = GET_PARENT_SEAL_BITMAP.staticcall(abi.encodePacked(blockNumber));
    require(success, "error calling getParentSealBitmap precompile");
    return getBytes32FromBytes(out, 0);
  }

  /**
   * @notice Verifies the BLS signature on the header and returns the seal bitmap.
   * The validator set used for verification is retrieved based on the parent hash field of the
   * header.  If the parent hash is not in the blockchain, verification fails.
   * @param header RLP encoded header
   * @return Bitmap parent seal with set bits at indices correspoinding to signing validators.
   */
  function getVerifiedSealBitmapFromHeader(bytes memory header) public view returns (bytes32) {
    bytes memory out;
    bool success;
    (success, out) = GET_VERIFIED_SEAL_BITMAP.staticcall(abi.encodePacked(header));
    require(success, "error calling getVerifiedSealBitmapFromHeader precompile");
    return getBytes32FromBytes(out, 0);
  }

  /**
   * @notice Converts bytes to uint256.
   * @param bs byte[] data
   * @param start offset into byte data to convert
   * @return uint256 data
   */
  function getUint256FromBytes(bytes memory bs, uint256 start) internal pure returns (uint256) {
    return uint256(getBytes32FromBytes(bs, start));
  }

  /**
   * @notice Converts bytes to bytes32.
   * @param bs byte[] data
   * @param start offset into byte data to convert
   * @return bytes32 data
   */
  function getBytes32FromBytes(bytes memory bs, uint256 start) internal pure returns (bytes32) {
    require(bs.length >= start.add(32), "slicing out of range");
    bytes32 x;
    assembly {
      x := mload(add(bs, add(start, 32)))
    }
    return x;
  }

  /**
   * @notice Returns the minimum number of required signers for a given block number.
   * @dev Computed in celo-blockchain as int(math.Ceil(float64(2*valSet.Size()) / 3))
   */
  function minQuorumSize(uint256 blockNumber) public view returns (uint256) {
    return numberValidatorsInSet(blockNumber).mul(2).add(2).div(3);
  }

  /**
   * @notice Computes byzantine quorum from current validator set size
   * @return Byzantine quorum of validators.
   */
  function minQuorumSizeInCurrentSet() public view returns (uint256) {
    return minQuorumSize(block.number);
  }
}

/contracts/common/interfaces/ICeloVersionedContract.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.5.13 <0.9.0;

interface ICeloVersionedContract {
  /**
   * @notice Returns the storage, major, minor, and patch version of the contract.
    * @return Storage version of the contract.
    * @return Major version of the contract.
    * @return Minor version of the contract.
    * @return Patch version of the contract.
   */
  function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256);
}

Compiler Settings

{"remappings":[],"optimizer":{"runs":200,"enabled":false},"metadata":{"useLiteralContent":true},"libraries":{},"evmVersion":"istanbul","compilationTarget":{"project:/contracts/governance/BlockchainParameters.sol":"BlockchainParameters"}}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"bool","name":"test","internalType":"bool"}]},{"type":"event","name":"BlockGasLimitSet","inputs":[{"type":"uint256","name":"limit","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"IntrinsicGasForAlternativeFeeCurrencySet","inputs":[{"type":"uint256","name":"gas","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"UptimeLookbackWindowSet","inputs":[{"type":"uint256","name":"window","internalType":"uint256","indexed":false},{"type":"uint256","name":"activationEpoch","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"blockGasLimit","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"checkProofOfPossession","inputs":[{"type":"address","name":"sender","internalType":"address"},{"type":"bytes","name":"blsKey","internalType":"bytes"},{"type":"bytes","name":"blsPop","internalType":"bytes"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}],"name":"fractionMulExp","inputs":[{"type":"uint256","name":"aNumerator","internalType":"uint256"},{"type":"uint256","name":"aDenominator","internalType":"uint256"},{"type":"uint256","name":"bNumerator","internalType":"uint256"},{"type":"uint256","name":"bDenominator","internalType":"uint256"},{"type":"uint256","name":"exponent","internalType":"uint256"},{"type":"uint256","name":"_decimals","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getBlockNumberFromHeader","inputs":[{"type":"bytes","name":"header","internalType":"bytes"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getEpochNumber","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getEpochNumberOfBlock","inputs":[{"type":"uint256","name":"blockNumber","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getEpochSize","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"getParentSealBitmap","inputs":[{"type":"uint256","name":"blockNumber","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"lookbackWindow","internalType":"uint256"}],"name":"getUptimeLookbackWindow","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"getVerifiedSealBitmapFromHeader","inputs":[{"type":"bytes","name":"header","internalType":"bytes"}],"constant":true},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}],"name":"getVersionNumber","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"hashHeader","inputs":[{"type":"bytes","name":"header","internalType":"bytes"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"initialize","inputs":[{"type":"uint256","name":"_gasForNonGoldCurrencies","internalType":"uint256"},{"type":"uint256","name":"gasLimit","internalType":"uint256"},{"type":"uint256","name":"lookbackWindow","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"initialized","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"intrinsicGasForAlternativeFeeCurrency","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"minQuorumSize","inputs":[{"type":"uint256","name":"blockNumber","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"minQuorumSizeInCurrentSet","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"numberValidatorsInCurrentSet","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"numberValidatorsInSet","inputs":[{"type":"uint256","name":"blockNumber","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setBlockGasLimit","inputs":[{"type":"uint256","name":"gasLimit","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setIntrinsicGasForAlternativeFeeCurrency","inputs":[{"type":"uint256","name":"gas","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setUptimeLookbackWindow","inputs":[{"type":"uint256","name":"window","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"oldValue","internalType":"uint256"},{"type":"uint256","name":"nextValue","internalType":"uint256"},{"type":"uint256","name":"nextValueActivationEpoch","internalType":"uint256"}],"name":"uptimeLookbackWindow","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"validatorSignerAddressFromCurrentSet","inputs":[{"type":"uint256","name":"index","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"validatorSignerAddressFromSet","inputs":[{"type":"uint256","name":"index","internalType":"uint256"},{"type":"uint256","name":"blockNumber","internalType":"uint256"}],"constant":true}]

Contract Creation Code

Verify & Publish 
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