ETH Price: $3,472.79 (+1.59%)
Gas: 5.55 Gwei

Contract

0xBfd0fb15e6C04b396EA12f5BB9Ba803E29B282Be
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

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Transaction Hash
Method
Block
From
To
Multi Generate72947682019-03-03 5:51:062123 days ago1551592266IN
0xBfd0fb15...E29B282Be
0 ETH0.000109963.24
Multi Generate64410602018-10-02 18:18:232275 days ago1538504303IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410562018-10-02 18:17:112275 days ago1538504231IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410542018-10-02 18:16:512275 days ago1538504211IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410472018-10-02 18:15:412275 days ago1538504141IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410342018-10-02 18:13:552275 days ago1538504035IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410252018-10-02 18:12:142275 days ago1538503934IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410182018-10-02 18:11:102275 days ago1538503870IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410082018-10-02 18:08:582275 days ago1538503738IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410032018-10-02 18:07:532275 days ago1538503673IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64410002018-10-02 18:07:062275 days ago1538503626IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409922018-10-02 18:05:372275 days ago1538503537IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409902018-10-02 18:05:112275 days ago1538503511IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409872018-10-02 18:04:032275 days ago1538503443IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409852018-10-02 18:03:302275 days ago1538503410IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409832018-10-02 18:02:502275 days ago1538503370IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409762018-10-02 18:01:152275 days ago1538503275IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409612018-10-02 17:57:472275 days ago1538503067IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409432018-10-02 17:54:492275 days ago1538502889IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409382018-10-02 17:53:332275 days ago1538502813IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409252018-10-02 17:51:242275 days ago1538502684IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409202018-10-02 17:50:412275 days ago1538502641IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409182018-10-02 17:49:592275 days ago1538502599IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64409112018-10-02 17:48:552275 days ago1538502535IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
Multi Generate64408982018-10-02 17:46:382275 days ago1538502398IN
0xBfd0fb15...E29B282Be
0 ETH0.000444613.10000009
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x182EBF4C...0e31e8c7F
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
MultiMerkleMine

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2018-07-26
*/

pragma solidity 0.4.24;

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
    uint256 public totalSupply;
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public view returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws 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;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

/*
 * @title MerkleProof
 * @dev Merkle proof verification
 * @note Based on https://github.com/ameensol/merkle-tree-solidity/blob/master/src/MerkleProof.sol
 */
library MerkleProof {
  /*
   * @dev Verifies a Merkle proof proving the existence of a leaf in a Merkle tree. Assumes that each pair of leaves
   * and each pair of pre-images is sorted.
   * @param _proof Merkle proof containing sibling hashes on the branch from the leaf to the root of the Merkle tree
   * @param _root Merkle root
   * @param _leaf Leaf of Merkle tree
   */
  function verifyProof(bytes _proof, bytes32 _root, bytes32 _leaf) public pure returns (bool) {
    // Check if proof length is a multiple of 32
    if (_proof.length % 32 != 0) return false;

    bytes32 proofElement;
    bytes32 computedHash = _leaf;

    for (uint256 i = 32; i <= _proof.length; i += 32) {
      assembly {
        // Load the current element of the proof
        proofElement := mload(add(_proof, i))
      }

      if (computedHash < proofElement) {
        // Hash(current computed hash + current element of the proof)
        computedHash = keccak256(computedHash, proofElement);
      } else {
        // Hash(current element of the proof + current computed hash)
        computedHash = keccak256(proofElement, computedHash);
      }
    }

    // Check if the computed hash (root) is equal to the provided root
    return computedHash == _root;
  }
}

/**
 * @title MerkleMine
 * @dev Token distribution based on providing Merkle proofs of inclusion in genesis state to generate allocation
 */
contract MerkleMine {
    using SafeMath for uint256;

    // ERC20 token being distributed
    ERC20 public token;
    // Merkle root representing genesis state which encodes token recipients
    bytes32 public genesisRoot;
    // Total amount of tokens that can be generated
    uint256 public totalGenesisTokens;
    // Total number of recipients included in genesis state
    uint256 public totalGenesisRecipients;
    // Amount of tokens per recipient allocation. Equal to `totalGenesisTokens` / `totalGenesisRecipients`
    uint256 public tokensPerAllocation;
    // Minimum ETH balance threshold for recipients included in genesis state
    uint256 public balanceThreshold;
    // Block number of genesis - used to determine which ETH accounts are included in the genesis state
    uint256 public genesisBlock;
    // Start block where a third party caller (not the recipient) can generate and split the allocation with the recipient
    // As the current block gets closer to `callerAllocationEndBlock`, the caller receives a larger precentage of the allocation
    uint256 public callerAllocationStartBlock;
    // From this block onwards, a third party caller (not the recipient) can generate and claim the recipient's full allocation
    uint256 public callerAllocationEndBlock;
    // Number of blocks in the caller allocation period as defined by `callerAllocationEndBlock` - `callerAllocationStartBlock`
    uint256 public callerAllocationPeriod;

    // Track if the generation process is started
    bool public started;

    // Track the already generated allocations for recipients
    mapping (address => bool) public generated;

    // Check that a recipient's allocation has not been generated
    modifier notGenerated(address _recipient) {
        require(!generated[_recipient]);
        _;
    }

    // Check that the generation period is started
    modifier isStarted() {
        require(started);
        _;
    }

    // Check that the generation period is not started
    modifier isNotStarted() {
        require(!started);
        _;
    }

    event Generate(address indexed _recipient, address indexed _caller, uint256 _recipientTokenAmount, uint256 _callerTokenAmount, uint256 _block);

    /**
     * @dev MerkleMine constructor
     * @param _token ERC20 token being distributed
     * @param _genesisRoot Merkle root representing genesis state which encodes token recipients
     * @param _totalGenesisTokens Total amount of tokens that can be generated
     * @param _totalGenesisRecipients Total number of recipients included in genesis state
     * @param _balanceThreshold Minimum ETH balance threshold for recipients included in genesis state
     * @param _genesisBlock Block number of genesis - used to determine which ETH accounts are included in the genesis state
     * @param _callerAllocationStartBlock Start block where a third party caller (not the recipient) can generate and split the allocation with the recipient
     * @param _callerAllocationEndBlock From this block onwards, a third party caller (not the recipient) can generate and claim the recipient's full allocation
     */
    function MerkleMine(
        address _token,
        bytes32 _genesisRoot,
        uint256 _totalGenesisTokens,
        uint256 _totalGenesisRecipients,
        uint256 _balanceThreshold,
        uint256 _genesisBlock,
        uint256 _callerAllocationStartBlock,
        uint256 _callerAllocationEndBlock
    )
        public
    {
        // Address of token contract must not be null
        require(_token != address(0));
        // Number of recipients must be non-zero
        require(_totalGenesisRecipients > 0);
        // Genesis block must be at or before the current block
        require(_genesisBlock <= block.number);
        // Start block for caller allocation must be after current block
        require(_callerAllocationStartBlock > block.number);
        // End block for caller allocation must be after caller allocation start block
        require(_callerAllocationEndBlock > _callerAllocationStartBlock);

        token = ERC20(_token);
        genesisRoot = _genesisRoot;
        totalGenesisTokens = _totalGenesisTokens;
        totalGenesisRecipients = _totalGenesisRecipients;
        tokensPerAllocation = _totalGenesisTokens.div(_totalGenesisRecipients);
        balanceThreshold = _balanceThreshold;
        genesisBlock = _genesisBlock;
        callerAllocationStartBlock = _callerAllocationStartBlock;
        callerAllocationEndBlock = _callerAllocationEndBlock;
        callerAllocationPeriod = _callerAllocationEndBlock.sub(_callerAllocationStartBlock);
    }

    /**
     * @dev Start the generation period - first checks that this contract's balance is equal to `totalGenesisTokens`
     * The generation period must not already be started
     */
    function start() external isNotStarted {
        // Check that this contract has a sufficient balance for the generation period
        require(token.balanceOf(this) >= totalGenesisTokens);

        started = true;
    }

    /**
     * @dev Generate a recipient's token allocation. Generation period must be started. Starting from `callerAllocationStartBlock`
     * a third party caller (not the recipient) can invoke this function to generate the recipient's token
     * allocation and claim a percentage of it. The percentage of the allocation claimed by the
     * third party caller is determined by how many blocks have elapsed since `callerAllocationStartBlock`.
     * After `callerAllocationEndBlock`, a third party caller can claim the full allocation
     * @param _recipient Recipient of token allocation
     * @param _merkleProof Proof of recipient's inclusion in genesis state Merkle root
     */
    function generate(address _recipient, bytes _merkleProof) external isStarted notGenerated(_recipient) {
        // Check the Merkle proof
        bytes32 leaf = keccak256(_recipient);
        // _merkleProof must prove inclusion of _recipient in the genesis state root
        require(MerkleProof.verifyProof(_merkleProof, genesisRoot, leaf));

        generated[_recipient] = true;

        address caller = msg.sender;

        if (caller == _recipient) {
            // If the caller is the recipient, transfer the full allocation to the caller/recipient
            require(token.transfer(_recipient, tokensPerAllocation));

            Generate(_recipient, _recipient, tokensPerAllocation, 0, block.number);
        } else {
            // If the caller is not the recipient, the token allocation generation
            // can only take place if we are in the caller allocation period
            require(block.number >= callerAllocationStartBlock);

            uint256 callerTokenAmount = callerTokenAmountAtBlock(block.number);
            uint256 recipientTokenAmount = tokensPerAllocation.sub(callerTokenAmount);

            if (callerTokenAmount > 0) {
                require(token.transfer(caller, callerTokenAmount));
            }

            if (recipientTokenAmount > 0) {
                require(token.transfer(_recipient, recipientTokenAmount));
            }

            Generate(_recipient, caller, recipientTokenAmount, callerTokenAmount, block.number);
        }
    }

    /**
     * @dev Return the amount of tokens claimable by a third party caller when generating a recipient's token allocation at a given block
     * @param _blockNumber Block at which to compute the amount of tokens claimable by a third party caller
     */
    function callerTokenAmountAtBlock(uint256 _blockNumber) public view returns (uint256) {
        if (_blockNumber < callerAllocationStartBlock) {
            // If the block is before the start of the caller allocation period, the third party caller can claim nothing
            return 0;
        } else if (_blockNumber >= callerAllocationEndBlock) {
            // If the block is at or after the end block of the caller allocation period, the third party caller can claim everything
            return tokensPerAllocation;
        } else {
            // During the caller allocation period, the third party caller can claim an increasing percentage
            // of the recipient's allocation based on a linear curve - as more blocks pass in the caller allocation
            // period, the amount claimable by the third party caller increases linearly
            uint256 blocksSinceCallerAllocationStartBlock = _blockNumber.sub(callerAllocationStartBlock);
            return tokensPerAllocation.mul(blocksSinceCallerAllocationStartBlock).div(callerAllocationPeriod);
        }
    }
}

/**
 * @title BytesUtil
 * @dev Utilities for extracting bytes from byte arrays
 * Functions taken from:
 * - https://github.com/ethereum/solidity-examples/blob/master/src/unsafe/Memory.sol
 * - https://github.com/ethereum/solidity-examples/blob/master/src/bytes/Bytes.sol
 */
library BytesUtil{
    uint256 internal constant BYTES_HEADER_SIZE = 32;
    uint256 internal constant WORD_SIZE = 32;
    
    /**
     * @dev Returns a memory pointer to the data portion of the provided bytes array.
     * @param bts Memory byte array
     */
    function dataPtr(bytes memory bts) internal pure returns (uint256 addr) {
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
    }
    
    /**
     * @dev Copy 'len' bytes from memory address 'src', to address 'dest'.
     * This function does not check the or destination, it only copies
     * the bytes.
     * @param src Memory address of source byte array
     * @param dest Memory address of destination byte array
     * @param len Number of bytes to copy from `src` to `dest`
     */
    function copy(uint256 src, uint256 dest, uint256 len) internal pure {
        // Copy word-length chunks while possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += WORD_SIZE;
            src += WORD_SIZE;
        }

        // Copy remaining bytes
        uint256 mask = 256 ** (WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }

    /**
     * @dev Creates a 'bytes memory' variable from the memory address 'addr', with the
     * length 'len'. The function will allocate new memory for the bytes array, and
     * the 'len bytes starting at 'addr' will be copied into that new memory.
     * @param addr Memory address of input byte array
     * @param len Number of bytes to copy from input byte array
     */
    function toBytes(uint256 addr, uint256 len) internal pure returns (bytes memory bts) {
        bts = new bytes(len);
        uint256 btsptr = dataPtr(bts);
        copy(addr, btsptr, len);
    }
    
    /**
     * @dev Copies 'len' bytes from 'bts' into a new array, starting at the provided 'startIndex'.
     * Returns the new copy.
     * Requires that:
     *  - 'startIndex + len <= self.length'
     * The length of the substring is: 'len'
     * @param bts Memory byte array to copy from
     * @param startIndex Index of `bts` to start copying bytes from
     * @param len Number of bytes to copy from `bts`
     */
    function substr(bytes memory bts, uint256 startIndex, uint256 len) internal pure returns (bytes memory) {
        require(startIndex + len <= bts.length);
        if (len == 0) {
            return;
        }
        uint256 addr = dataPtr(bts);
        return toBytes(addr + startIndex, len);
    }

    /**
     * @dev Reads a bytes32 value from a byte array by copying 32 bytes from `bts` starting at the provided `startIndex`.
     * @param bts Memory byte array to copy from
     * @param startIndex Index of `bts` to start copying bytes from
     */
    function readBytes32(bytes memory bts, uint256 startIndex) internal pure returns (bytes32 result) {
        require(startIndex + 32 <= bts.length);

        uint256 addr = dataPtr(bts);

        assembly {
            result := mload(add(addr, startIndex))
        }

        return result;
    }
}

/**
 * @title MultiMerkleMine
 * @dev The MultiMerkleMine contract is purely a convenience wrapper around an existing MerkleMine contract deployed on the blockchain.
 */
contract MultiMerkleMine {
	using SafeMath for uint256;

	/**
     * @dev Generates token allocations for multiple recipients. Generation period must be started.
     * @param _merkleMineContract Address of the deployed MerkleMine contract
     * @param _recipients Array of recipients
     * @param _merkleProofs Proofs for respective recipients constructed in the format: 
     *       [proof_1_size, proof_1, proof_2_size, proof_2, ... , proof_n_size, proof_n]
     */
	function multiGenerate(address _merkleMineContract, address[] _recipients, bytes _merkleProofs) public {
		MerkleMine mine = MerkleMine(_merkleMineContract);
		ERC20 token = ERC20(mine.token());

		require(
			block.number >= mine.callerAllocationStartBlock(),
			"caller allocation period has not started"
		);
		
		uint256 initialBalance = token.balanceOf(this);
		bytes[] memory proofs = new bytes[](_recipients.length);

		// Counter to keep track of position in `_merkleProofs` byte array
		uint256 i = 0;
		// Counter to keep track of index of each extracted Merkle proof
		uint256 j = 0;

		// Extract proofs
		while(i < _merkleProofs.length){
			uint256 proofSize = uint256(BytesUtil.readBytes32(_merkleProofs, i));

			require(
				proofSize % 32 == 0,
				"proof size must be a multiple of 32"
			);

			proofs[j] = BytesUtil.substr(_merkleProofs, i + 32, proofSize);

			i = i + 32 + proofSize;
			j++;
		}

		require(
			_recipients.length == j,
			"number of recipients != number of proofs"
		);

		for (uint256 k = 0; k < _recipients.length; k++) {
			// If recipient's token allocation has not been generated, generate the token allocation
			// Else, continue to the next recipient
			if (!mine.generated(_recipients[k])) {
				mine.generate(_recipients[k], proofs[k]);
			}
		}

		uint256 newBalanceSinceAllocation = token.balanceOf(this);
		uint256 callerTokensGenerated = newBalanceSinceAllocation.sub(initialBalance);

		// Transfer caller's portion of tokens generated by this function call 
		if (callerTokensGenerated > 0) {
			require(token.transfer(msg.sender, callerTokensGenerated));
		}
	}
}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"name":"_merkleMineContract","type":"address"},{"name":"_recipients","type":"address[]"},{"name":"_merkleProofs","type":"bytes"}],"name":"multiGenerate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

Deployed Bytecode

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Swarm Source

bzzr://3d8784cc2ee440d8fd9a5735fce92aa140c837350e6c2b6d292a0bc860aa404a

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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.