diff --git a/truffle/contracts/Migrations.sol b/truffle/contracts/Migrations.sol
new file mode 100644
index 0000000..c378ffb
--- /dev/null
+++ b/truffle/contracts/Migrations.sol
@@ -0,0 +1,23 @@
+pragma solidity >=0.4.21 <0.6.0;
+
+contract Migrations {
+  address public owner;
+  uint public last_completed_migration;
+
+  constructor() public {
+    owner = msg.sender;
+  }
+
+  modifier restricted() {
+    if (msg.sender == owner) _;
+  }
+
+  function setCompleted(uint completed) public restricted {
+    last_completed_migration = completed;
+  }
+
+  function upgrade(address new_address) public restricted {
+    Migrations upgraded = Migrations(new_address);
+    upgraded.setCompleted(last_completed_migration);
+  }
+}
diff --git a/truffle/contracts/lazy.sol b/truffle/contracts/lazy.sol
new file mode 100644
index 0000000..3db9739
--- /dev/null
+++ b/truffle/contracts/lazy.sol
@@ -0,0 +1,80 @@
+pragma solidity ^0.5.4;
+pragma experimental ABIEncoderV2;
+
+interface Structs {
+    struct Data {
+        uint x;
+    }
+    
+    struct Proof {
+        uint x;
+    }
+
+}
+
+contract Verifier is Structs {
+    function isValid(Data calldata data, Proof calldata proof) external returns (bool);
+}
+
+contract Lazy is Structs {
+    event Submitted(address indexed sender, uint256 index, Task task);
+    event Challenged(address indexed challenger, uint256 index);
+
+
+    enum Status {UNCHECKED, VALID, INVALID, FINALIZED} 
+    struct Task {
+        Data data;
+        Proof proof;
+        address payable submitter;
+        uint96 timestamp;
+        Status status;
+    }
+    
+    Task[] public tasks;
+    
+    uint256 public stake;
+    Verifier public verifier;
+
+    /// @dev This function submits data.
+    /// @param data - public inptut for zkp
+    /// @param proof - proof that verifies input
+    function submit(Data calldata data, Proof calldata proof) external payable {
+        require(msg.value == stake);
+
+        Task memory task = Task(data, proof, msg.sender, uint96(now), Status.UNCHECKED);
+        uint index = tasks.push(task);
+
+        emit Submitted(msg.sender, index, task);
+    }
+
+    /// @dev This function challenges a submission by calling the validation function.
+    /// @param id The id of the submission to challenge.
+    function challenge(uint id) external {
+        Task storage task = tasks[id];
+        require(now < task.timestamp + 1 weeks);
+        require(task.status == Status.UNCHECKED);
+        
+        if (verifier.isValid(task.data, task.proof)) {
+            task.status = Status.VALID;
+            task.submitter.transfer(stake);
+        } else {
+            task.status = Status.INVALID;
+            msg.sender.transfer(stake);
+        }
+        
+    
+        // пруф не подходит, на это надо реагировать
+
+        emit Challenged(msg.sender, id);
+    }
+    
+    function finzalize(uint id) external {
+        Task storage task = tasks[id];
+        require(now > task.timestamp + 1 weeks);
+        require(task.status == Status.UNCHECKED);
+        
+        task.status = Status.FINALIZED;
+        msg.sender.transfer(stake);
+    }
+}
+    
diff --git a/truffle/migrations/1_initial_migration.js b/truffle/migrations/1_initial_migration.js
new file mode 100644
index 0000000..ee2135d
--- /dev/null
+++ b/truffle/migrations/1_initial_migration.js
@@ -0,0 +1,5 @@
+const Migrations = artifacts.require("Migrations");
+
+module.exports = function(deployer) {
+  deployer.deploy(Migrations);
+};
diff --git a/truffle/truffle-config.js b/truffle/truffle-config.js
new file mode 100644
index 0000000..3865690
--- /dev/null
+++ b/truffle/truffle-config.js
@@ -0,0 +1,99 @@
+/**
+ * Use this file to configure your truffle project. It's seeded with some
+ * common settings for different networks and features like migrations,
+ * compilation and testing. Uncomment the ones you need or modify
+ * them to suit your project as necessary.
+ *
+ * More information about configuration can be found at:
+ *
+ * truffleframework.com/docs/advanced/configuration
+ *
+ * To deploy via Infura you'll need a wallet provider (like truffle-hdwallet-provider)
+ * to sign your transactions before they're sent to a remote public node. Infura accounts
+ * are available for free at: infura.io/register.
+ *
+ * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
+ * public/private key pairs. If you're publishing your code to GitHub make sure you load this
+ * phrase from a file you've .gitignored so it doesn't accidentally become public.
+ *
+ */
+
+// const HDWalletProvider = require('truffle-hdwallet-provider');
+// const infuraKey = "fj4jll3k.....";
+//
+// const fs = require('fs');
+// const mnemonic = fs.readFileSync(".secret").toString().trim();
+
+module.exports = {
+  /**
+   * Networks define how you connect to your ethereum client and let you set the
+   * defaults web3 uses to send transactions. If you don't specify one truffle
+   * will spin up a development blockchain for you on port 9545 when you
+   * run `develop` or `test`. You can ask a truffle command to use a specific
+   * network from the command line, e.g
+   *
+   * $ truffle test --network <network-name>
+   */
+
+  networks: {
+    // Useful for testing. The `development` name is special - truffle uses it by default
+    // if it's defined here and no other network is specified at the command line.
+    // You should run a client (like ganache-cli, geth or parity) in a separate terminal
+    // tab if you use this network and you must also set the `host`, `port` and `network_id`
+    // options below to some value.
+    //
+    // development: {
+    //  host: "127.0.0.1",     // Localhost (default: none)
+    //  port: 8545,            // Standard Ethereum port (default: none)
+    //  network_id: "*",       // Any network (default: none)
+    // },
+
+    // Another network with more advanced options...
+    // advanced: {
+      // port: 8777,             // Custom port
+      // network_id: 1342,       // Custom network
+      // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
+      // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
+      // from: <address>,        // Account to send txs from (default: accounts[0])
+      // websockets: true        // Enable EventEmitter interface for web3 (default: false)
+    // },
+
+    // Useful for deploying to a public network.
+    // NB: It's important to wrap the provider as a function.
+    // ropsten: {
+      // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
+      // network_id: 3,       // Ropsten's id
+      // gas: 5500000,        // Ropsten has a lower block limit than mainnet
+      // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
+      // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+      // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+    // },
+
+    // Useful for private networks
+    // private: {
+      // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
+      // network_id: 2111,   // This network is yours, in the cloud.
+      // production: true    // Treats this network as if it was a public net. (default: false)
+    // }
+  },
+
+  // Set default mocha options here, use special reporters etc.
+  mocha: {
+    // timeout: 100000
+  },
+
+  // Configure your compilers
+  compilers: {
+    solc: {
+      // version: "0.5.1",    // Fetch exact version from solc-bin (default: truffle's version)
+      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
+      // settings: {          // See the solidity docs for advice about optimization and evmVersion
+      //  optimizer: {
+      //    enabled: false,
+      //    runs: 200
+      //  },
+      //  evmVersion: "byzantium"
+      // }
+    }
+  }
+}