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Outline

•  contract Multicall *
•    - function aggregate(Call[] memory call ...
•    - function getEthBalance(address addr)
•    - function getBlockHash(uint256 blockNu ...
•    - function getLastBlockHash()
•    - function getCurrentBlockTimestamp()
•    - function getCurrentBlockDifficulty()
•    - function getCurrentBlockGasLimit()
•    - function getCurrentBlockCoinbase()

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/**
 *Submitted for verification at Etherscan.io on 2019-06-10
*/

pragma solidity >=0.5.0;
pragma experimental ABIEncoderV2;

/// @title Multicall - Aggregate results from multiple read-only function calls
/// @author Michael Elliot <[email protected]>
/// @author Joshua Levine <[email protected]>
/// @author Nick Johnson <[email protected]>

contract Multicall {
    struct Call {
        address target;
        bytes callData;
    }
    function aggregate(Call[] memory calls) public returns (uint256 blockNumber, bytes[] memory returnData) {
        blockNumber = block.number;
        returnData = new bytes[](calls.length);
        for(uint256 i = 0; i < calls.length; i++) {
            (bool success, bytes memory ret) = calls[i].target.call(calls[i].callData);
            require(success);
            returnData[i] = ret;
        }
    }
    // Helper functions
    function getEthBalance(address addr) public view returns (uint256 balance) {
        balance = addr.balance;
    }
    function getBlockHash(uint256 blockNumber) public view returns (bytes32 blockHash) {
        blockHash = blockhash(blockNumber);
    }
    function getLastBlockHash() public view returns (bytes32 blockHash) {
        blockHash = blockhash(block.number - 1);
    }
    function getCurrentBlockTimestamp() public view returns (uint256 timestamp) {
        timestamp = block.timestamp;
    }
    function getCurrentBlockDifficulty() public view returns (uint256 difficulty) {
        difficulty = block.difficulty;
    }
    function getCurrentBlockGasLimit() public view returns (uint256 gaslimit) {
        gaslimit = block.gaslimit;
    }
    function getCurrentBlockCoinbase() public view returns (address coinbase) {
        coinbase = block.coinbase;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":true,"inputs":[],"name":"getCurrentBlockTimestamp","outputs":[{"name":"timestamp","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"components":[{"name":"target","type":"address"},{"name":"callData","type":"bytes"}],"name":"calls","type":"tuple[]"}],"name":"aggregate","outputs":[{"name":"blockNumber","type":"uint256"},{"name":"returnData","type":"bytes[]"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getLastBlockHash","outputs":[{"name":"blockHash","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"addr","type":"address"}],"name":"getEthBalance","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getCurrentBlockDifficulty","outputs":[{"name":"difficulty","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getCurrentBlockGasLimit","outputs":[{"name":"gaslimit","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getCurrentBlockCoinbase","outputs":[{"name":"coinbase","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"blockNumber","type":"uint256"}],"name":"getBlockHash","outputs":[{"name":"blockHash","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"}]

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