diff --git a/contracts/lib/IsWorkerInterface.sol b/contracts/lib/IsWorkerInterface.sol
new file mode 100644
index 00000000..677586a5
--- /dev/null
+++ b/contracts/lib/IsWorkerInterface.sol
@@ -0,0 +1,34 @@
+pragma solidity ^0.5.0;
+
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ *  @title IsWorkerInterface provides a method to check if an address is
+ *         currently registered as an active worker.
+ */
+interface IsWorkerInterface {
+
+    /**
+     * @notice Checks if an address is currently registered as an active worker.
+     *
+     * @param _worker Address to check.
+     *
+     * @return isWorker_ True if the worker is already added and expiration
+     *                   height is more than or equal to current block number.
+     *                   Returns false otherwise.
+     */
+    function isWorker(address _worker) external view returns (bool isWorker_);
+
+}
diff --git a/contracts/lib/Organization.sol b/contracts/lib/Organization.sol
new file mode 100644
index 00000000..4a48211a
--- /dev/null
+++ b/contracts/lib/Organization.sol
@@ -0,0 +1,251 @@
+pragma solidity ^0.5.0;
+
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import "./SafeMath.sol";
+import "./OrganizationInterface.sol";
+import "./IsWorkerInterface.sol";
+
+
+/**
+ * @title Organization contract.
+ *
+ * @notice The organization represents an entity that manages the
+ *         mosaic ecosystem and therefore the Organization.sol contract holds
+ *         all the keys required to administer the mosaic contracts.
+ */
+contract Organization is OrganizationInterface, IsWorkerInterface {
+    using SafeMath for uint256;
+
+    /* Storage */
+
+    /** Address for which private key will be owned by organization. */
+    address public owner;
+
+    /**
+     * Proposed Owner is the newly proposed address that was proposed by the
+     * current owner for ownership transfer.
+     */
+    address public proposedOwner;
+
+    /** Admin address set by owner to facilitate operations of an economy. */
+    address public admin;
+
+    /**
+     *  Map of whitelisted worker addresses to their expiration block height.
+     */
+    mapping(address => uint256) public workers;
+
+
+    /* Modifiers */
+
+    /**
+     * onlyOwner functions can only be called from the address that is
+     * registered as the owner.
+     */
+    modifier onlyOwner()
+    {
+        require(
+            msg.sender == owner,
+            "Only owner is allowed to call this method."
+        );
+
+        _;
+    }
+
+    /**
+     * onlyOwnerOrAdmin functions can only be called from an address that is
+     * either registered as owner or as admin.
+     */
+    modifier onlyOwnerOrAdmin()
+    {
+        require(
+            msg.sender == owner || msg.sender == admin,
+            "Only owner and admin are allowed to call this method."
+        );
+
+        _;
+    }
+
+
+    /* Constructor */
+
+    /**
+     * @notice The address that creates the contract is set as the initial
+     *         owner.
+     */
+    constructor() public
+    {
+        owner = msg.sender;
+    }
+
+
+    /* External Functions */
+
+    /**
+     * @notice Proposes a new owner of this contract. Ownership will not be
+     *         transferred until the new, proposed owner accepts the proposal.
+     *         Allows resetting of proposed owner to address(0).
+     *
+     * @param _proposedOwner Proposed owner address.
+     *
+     * @return success_ True on successful execution.
+     */
+    function initiateOwnershipTransfer(
+        address _proposedOwner
+    )
+        external
+        onlyOwner
+        returns (bool success_)
+    {
+        require(
+            _proposedOwner != owner,
+            "Proposed owner address can't be current owner address."
+        );
+
+        proposedOwner = _proposedOwner;
+
+        emit OwnershipTransferInitiated(_proposedOwner);
+
+        success_ = true;
+    }
+
+    /**
+     * @notice Complete ownership transfer to proposed owner. Must be called by
+     *         the proposed owner.
+     *
+     * @return success_ True on successful execution.
+     */
+    function completeOwnershipTransfer() external returns (bool success_)
+    {
+        require(
+            msg.sender == proposedOwner,
+            "Caller is not proposed owner address."
+        );
+
+        owner = proposedOwner;
+        proposedOwner = address(0);
+
+        emit OwnershipTransferCompleted(owner);
+
+        success_ = true;
+    }
+
+    /**
+     * @notice Sets the admin address. Can only be called by owner or current
+     *         admin. If called by the current admin, adminship is transferred
+     *         to the given address.
+     *         Admin can be set to address(0).
+     *
+     * @param _admin Admin address to be set.
+     *
+     * @return success_ True on successful execution.
+     */
+    function setAdmin(
+        address _admin
+    )
+        external
+        onlyOwnerOrAdmin
+        returns (bool success_)
+    {
+        require(
+            _admin != owner,
+            "Admin address can't be the same as the owner address."
+        );
+
+        /*
+         * If the address does not change, the call is considered a success,
+         * but we don't need to emit an event as it did not actually change.
+         */
+        if (admin != _admin) {
+            admin = _admin;
+            emit AdminAddressChanged(admin);
+        }
+
+        success_ = true;
+    }
+
+    /**
+     * @notice Sets worker and its expiration block height.
+     *         Admin/Owner has the flexibility to extend/reduce worker
+     *         expiration height. This way, a worker activation/deactivation
+     *         can be controlled without adding/removing worker keys.
+     *
+     * @param _worker Worker address to be added.
+     * @param _expirationHeight Expiration block height of worker.
+     *
+     * @return remainingBlocks_ Remaining number of blocks for which worker is
+     *                          active.
+     */
+    function setWorker(
+        address _worker,
+        uint256 _expirationHeight
+    )
+        external
+        onlyOwnerOrAdmin
+        returns (uint256 remainingBlocks_)
+    {
+        require(
+            _worker != address(0),
+            "Worker address cannot be null."
+        );
+
+        require(
+            _expirationHeight > block.number,
+            "Expiration height must be in the future."
+        );
+
+        workers[_worker] = _expirationHeight;
+        remainingBlocks_ = _expirationHeight.sub(block.number);
+
+        emit WorkerSet(_worker, _expirationHeight, remainingBlocks_);
+    }
+
+    /**
+     * @notice Removes a worker.
+     *
+     * @param _worker Worker address to be removed.
+     *
+     * @return isUnset_ True if the worker existed else returns false.
+     */
+    function unsetWorker(
+        address _worker
+    )
+        external
+        onlyOwnerOrAdmin
+        returns (bool isUnset_)
+    {
+        isUnset_ = (workers[_worker] > 0);
+
+        delete workers[_worker];
+
+        emit WorkerUnset(_worker, isUnset_);
+    }
+
+    /**
+     * @notice Checks if an address is currently registered as an active worker.
+     *
+     * @param _worker Address to check.
+     *
+     * @return isWorker_ True if the worker is already added and expiration
+     *                   height is more than or equal to current block number.
+     *                   Returns false otherwise.
+     */
+    function isWorker(address _worker) external view returns (bool isWorker_)
+    {
+        isWorker_ = workers[_worker] > block.number;
+    }
+
+}
diff --git a/contracts/lib/OrganizationInterface.sol b/contracts/lib/OrganizationInterface.sol
new file mode 100644
index 00000000..c5ed324e
--- /dev/null
+++ b/contracts/lib/OrganizationInterface.sol
@@ -0,0 +1,97 @@
+pragma solidity ^0.5.0;
+
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+/**
+ *  @title OrganizationInterface provides methods to manage an organization.
+ */
+interface OrganizationInterface {
+
+    /* Events */
+
+    /** Emitted when a current owner initiates a change of ownership. */
+    event OwnershipTransferInitiated(address indexed proposedOwner);
+
+    /** Emitted when a new owner accepts the ownership transfer. */
+    event OwnershipTransferCompleted(address newOwner);
+
+    /** Emitted whenever an owner or admin changes the address of the admin. */
+    event AdminAddressChanged(address indexed newAdmin);
+
+    /** Emitted when a worker address was set. */
+    event WorkerSet(
+        address indexed worker,
+        uint256 expirationHeight,
+        uint256 remainingHeight
+    );
+
+    /** Emitted when a worker address is deleted from the contract. */
+    event WorkerUnset(address worker, bool wasSet);
+
+
+    /* External Functions */
+
+    /**
+     * @notice Proposes a new owner of this contract. Ownership will not be
+     *         transferred until the new, proposed owner accepts the proposal.
+     *         Allows resetting of proposed owner to address(0).
+     *
+     * @param _proposedOwner Proposed owner address.
+     *
+     * @return success_ True on successful execution.
+     */
+    function initiateOwnershipTransfer(address _proposedOwner)
+        external
+        returns (bool success_);
+
+    /**
+     * @notice Complete ownership transfer to proposed owner.
+     *
+     * @return success_ True on successful execution.
+     */
+    function completeOwnershipTransfer() external returns (bool success_);
+
+    /**
+     * @notice Sets admin address.
+     *
+     * @param _admin Admin address to be set.
+     *
+     * @return success_ True on successful execution.
+     */
+    function setAdmin(address _admin) external returns (bool success_);
+
+    /**
+     * @notice Sets worker and its expiration block height.
+     *
+     * @param _worker Worker address to be added.
+     * @param _expirationHeight Expiration block height of the given worker.
+     *
+     * @return remainingBlocks_ Remaining number of blocks for which worker is
+     *                          active.
+     */
+    function setWorker(address _worker, uint256 _expirationHeight)
+        external
+        returns (uint256 remainingBlocks_);
+
+    /**
+     * @notice Removes a worker.
+     *
+     * @param _worker Worker address to be removed.
+     *
+     * @return isUnset_ True if the worker existed else returns false.
+     */
+    function unsetWorker(address _worker) external returns (bool isUnset_);
+}
diff --git a/package-lock.json b/package-lock.json
index 97bc9a57..e94e176a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,7 +22,7 @@
       "integrity": "sha512-y2OKSEW4gf2838Eavc56vQY9V46zaXkf3Jl1WpTfUBbzAVrXSr4JRZAAWv55Tv9s5WNz1rVgBgz5d2aJIL1QCg==",
       "dev": true,
       "requires": {
-        "web3": "0.18.4"
+        "web3": "^0.18.4"
       },
       "dependencies": {
         "web3": {
@@ -32,10 +32,10 @@
           "dev": true,
           "requires": {
             "bignumber.js": "git+https://github.com/debris/bignumber.js.git#94d7146671b9719e00a09c29b01a691bc85048c2",
-            "crypto-js": "3.1.8",
-            "utf8": "2.1.2",
-            "xhr2": "0.1.4",
-            "xmlhttprequest": "1.8.0"
+            "crypto-js": "^3.1.4",
+            "utf8": "^2.1.1",
+            "xhr2": "*",
+            "xmlhttprequest": "*"
           }
         }
       }
@@ -46,7 +46,7 @@
       "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
       "dev": true,
       "requires": {
-        "mime-types": "2.1.20",
+        "mime-types": "~2.1.18",
         "negotiator": "0.6.1"
       }
     },
@@ -62,10 +62,10 @@
       "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "fast-deep-equal": "1.1.0",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.3.1"
+        "co": "^4.6.0",
+        "fast-deep-equal": "^1.0.0",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.3.0"
       }
     },
     "amdefine": {
@@ -93,7 +93,7 @@
       "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
       }
     },
     "array-flatten": {
@@ -108,7 +108,7 @@
       "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
       "dev": true,
       "requires": {
-        "safer-buffer": "2.1.2"
+        "safer-buffer": "~2.1.0"
       }
     },
     "asn1.js": {
@@ -117,9 +117,9 @@
       "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "inherits": "2.0.1",
-        "minimalistic-assert": "1.0.1"
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0"
       }
     },
     "assert": {
@@ -139,7 +139,7 @@
     },
     "async": {
       "version": "1.5.2",
-      "resolved": "http://registry.npmjs.org/async/-/async-1.5.2.tgz",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
@@ -186,11 +186,12 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "tweetnacl": "0.14.5"
+        "tweetnacl": "^0.14.3"
       }
     },
     "bignumber.js": {
       "version": "git+https://github.com/debris/bignumber.js.git#94d7146671b9719e00a09c29b01a691bc85048c2",
+      "from": "git+https://github.com/debris/bignumber.js.git#94d7146671b9719e00a09c29b01a691bc85048c2",
       "dev": true
     },
     "bindings": {
@@ -205,8 +206,8 @@
       "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
       "dev": true,
       "requires": {
-        "readable-stream": "2.3.6",
-        "safe-buffer": "5.1.2"
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
       }
     },
     "block-stream": {
@@ -215,7 +216,7 @@
       "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
       "dev": true,
       "requires": {
-        "inherits": "2.0.1"
+        "inherits": "~2.0.0"
       }
     },
     "bluebird": {
@@ -237,15 +238,15 @@
       "dev": true,
       "requires": {
         "bytes": "3.0.0",
-        "content-type": "1.0.4",
+        "content-type": "~1.0.4",
         "debug": "2.6.9",
-        "depd": "1.1.2",
-        "http-errors": "1.6.3",
+        "depd": "~1.1.2",
+        "http-errors": "~1.6.3",
         "iconv-lite": "0.4.23",
-        "on-finished": "2.3.0",
+        "on-finished": "~2.3.0",
         "qs": "6.5.2",
         "raw-body": "2.3.3",
-        "type-is": "1.6.16"
+        "type-is": "~1.6.16"
       },
       "dependencies": {
         "debug": {
@@ -265,7 +266,7 @@
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "dev": true,
       "requires": {
-        "balanced-match": "1.0.0",
+        "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
       }
     },
@@ -287,12 +288,12 @@
       "integrity": "sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==",
       "dev": true,
       "requires": {
-        "buffer-xor": "1.0.3",
-        "cipher-base": "1.0.4",
-        "create-hash": "1.2.0",
-        "evp_bytestokey": "1.0.3",
-        "inherits": "2.0.1",
-        "safe-buffer": "5.1.2"
+        "buffer-xor": "^1.0.3",
+        "cipher-base": "^1.0.0",
+        "create-hash": "^1.1.0",
+        "evp_bytestokey": "^1.0.3",
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
       }
     },
     "browserify-cipher": {
@@ -301,9 +302,9 @@
       "integrity": "sha512-sPhkz0ARKbf4rRQt2hTpAHqn47X3llLkUGn+xEJzLjwY8LRs2p0v7ljvI5EyoRO/mexrNunNECisZs+gw2zz1w==",
       "dev": true,
       "requires": {
-        "browserify-aes": "1.2.0",
-        "browserify-des": "1.0.2",
-        "evp_bytestokey": "1.0.3"
+        "browserify-aes": "^1.0.4",
+        "browserify-des": "^1.0.0",
+        "evp_bytestokey": "^1.0.0"
       }
     },
     "browserify-des": {
@@ -312,10 +313,10 @@
       "integrity": "sha512-BioO1xf3hFwz4kc6iBhI3ieDFompMhrMlnDFC4/0/vd5MokpuAc3R+LYbwTA9A5Yc9pq9UYPqffKpW2ObuwX5A==",
       "dev": true,
       "requires": {
-        "cipher-base": "1.0.4",
-        "des.js": "1.0.0",
-        "inherits": "2.0.1",
-        "safe-buffer": "5.1.2"
+        "cipher-base": "^1.0.1",
+        "des.js": "^1.0.0",
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.1.2"
       }
     },
     "browserify-rsa": {
@@ -324,8 +325,8 @@
       "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "randombytes": "2.0.6"
+        "bn.js": "^4.1.0",
+        "randombytes": "^2.0.1"
       }
     },
     "browserify-sha3": {
@@ -334,7 +335,7 @@
       "integrity": "sha1-P/NKMAbvFcD7NWflQbkaI0ASPRE=",
       "dev": true,
       "requires": {
-        "js-sha3": "0.3.1"
+        "js-sha3": "^0.3.1"
       }
     },
     "browserify-sign": {
@@ -343,13 +344,13 @@
       "integrity": "sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "browserify-rsa": "4.0.1",
-        "create-hash": "1.2.0",
-        "create-hmac": "1.1.7",
-        "elliptic": "6.4.1",
-        "inherits": "2.0.1",
-        "parse-asn1": "5.1.1"
+        "bn.js": "^4.1.1",
+        "browserify-rsa": "^4.0.0",
+        "create-hash": "^1.1.0",
+        "create-hmac": "^1.1.2",
+        "elliptic": "^6.0.0",
+        "inherits": "^2.0.1",
+        "parse-asn1": "^5.0.0"
       }
     },
     "buffer": {
@@ -358,8 +359,8 @@
       "integrity": "sha512-c+Ko0loDaFfuPWiL02ls9Xd3GO3cPVmUobQ6t3rXNUk304u6hGq+8N/kFi+QEIKhzK3uwolVhLzszmfLmMLnqg==",
       "dev": true,
       "requires": {
-        "base64-js": "1.3.0",
-        "ieee754": "1.1.12"
+        "base64-js": "^1.0.2",
+        "ieee754": "^1.1.4"
       }
     },
     "buffer-alloc": {
@@ -368,8 +369,8 @@
       "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
       "dev": true,
       "requires": {
-        "buffer-alloc-unsafe": "1.1.0",
-        "buffer-fill": "1.0.0"
+        "buffer-alloc-unsafe": "^1.1.0",
+        "buffer-fill": "^1.0.0"
       }
     },
     "buffer-alloc-unsafe": {
@@ -438,8 +439,8 @@
       "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
       "dev": true,
       "requires": {
-        "inherits": "2.0.1",
-        "safe-buffer": "5.1.2"
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
       }
     },
     "cliui": {
@@ -448,9 +449,9 @@
       "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1",
-        "wrap-ansi": "2.1.0"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1",
+        "wrap-ansi": "^2.0.0"
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@@ -471,7 +472,7 @@
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       "dev": true,
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-        "delayed-stream": "1.0.0"
+        "delayed-stream": "~1.0.0"
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@@ -528,8 +529,8 @@
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       "dev": true,
       "requires": {
-        "object-assign": "4.1.1",
-        "vary": "1.1.2"
+        "object-assign": "^4",
+        "vary": "^1"
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@@ -538,8 +539,8 @@
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-        "bn.js": "4.11.8",
-        "elliptic": "6.4.1"
+        "bn.js": "^4.1.0",
+        "elliptic": "^6.0.0"
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@@ -548,11 +549,11 @@
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-        "md5.js": "1.3.4",
-        "ripemd160": "2.0.2",
-        "sha.js": "2.4.11"
+        "cipher-base": "^1.0.1",
+        "inherits": "^2.0.1",
+        "md5.js": "^1.3.4",
+        "ripemd160": "^2.0.1",
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@@ -561,12 +562,12 @@
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-        "safe-buffer": "5.1.2",
-        "sha.js": "2.4.11"
+        "cipher-base": "^1.0.3",
+        "create-hash": "^1.1.0",
+        "inherits": "^2.0.1",
+        "ripemd160": "^2.0.0",
+        "safe-buffer": "^5.0.1",
+        "sha.js": "^2.4.8"
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@@ -575,9 +576,9 @@
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-        "shebang-command": "1.2.0",
-        "which": "1.3.1"
+        "lru-cache": "^4.0.1",
+        "shebang-command": "^1.2.0",
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@@ -586,17 +587,17 @@
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-        "public-encrypt": "4.0.2",
-        "randombytes": "2.0.6",
-        "randomfill": "1.0.4"
+        "browserify-cipher": "^1.0.0",
+        "browserify-sign": "^4.0.0",
+        "create-ecdh": "^4.0.0",
+        "create-hash": "^1.1.0",
+        "create-hmac": "^1.1.0",
+        "diffie-hellman": "^5.0.0",
+        "inherits": "^2.0.1",
+        "pbkdf2": "^3.0.3",
+        "public-encrypt": "^4.0.0",
+        "randombytes": "^2.0.0",
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@@ -611,7 +612,7 @@
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@@ -647,14 +648,14 @@
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-        "make-dir": "1.3.0",
-        "pify": "2.3.0",
-        "strip-dirs": "2.1.0"
+        "decompress-tar": "^4.0.0",
+        "decompress-tarbz2": "^4.0.0",
+        "decompress-targz": "^4.0.0",
+        "decompress-unzip": "^4.0.1",
+        "graceful-fs": "^4.1.10",
+        "make-dir": "^1.0.0",
+        "pify": "^2.3.0",
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@@ -663,7 +664,7 @@
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       "dev": true,
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+        "mimic-response": "^1.0.0"
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@@ -672,9 +673,9 @@
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-        "is-stream": "1.1.0",
-        "tar-stream": "1.6.2"
+        "file-type": "^5.2.0",
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@@ -683,11 +684,11 @@
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-        "is-stream": "1.1.0",
-        "seek-bzip": "1.0.5",
-        "unbzip2-stream": "1.3.0"
+        "decompress-tar": "^4.1.0",
+        "file-type": "^6.1.0",
+        "is-stream": "^1.1.0",
+        "seek-bzip": "^1.0.5",
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@@ -704,9 +705,9 @@
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-        "file-type": "5.2.0",
-        "is-stream": "1.1.0"
+        "decompress-tar": "^4.1.1",
+        "file-type": "^5.2.0",
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@@ -715,10 +716,10 @@
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-        "pify": "2.3.0",
-        "yauzl": "2.10.0"
+        "file-type": "^3.8.0",
+        "get-stream": "^2.2.0",
+        "pify": "^2.3.0",
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@@ -733,8 +734,8 @@
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-            "object-assign": "4.1.1",
-            "pinkie-promise": "2.0.1"
+            "object-assign": "^4.0.1",
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@@ -763,8 +764,8 @@
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-        "inherits": "2.0.1",
-        "minimalistic-assert": "1.0.1"
+        "inherits": "^2.0.1",
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@@ -785,9 +786,9 @@
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-        "bn.js": "4.11.8",
-        "miller-rabin": "4.0.1",
-        "randombytes": "2.0.6"
+        "bn.js": "^4.1.0",
+        "miller-rabin": "^4.0.0",
+        "randombytes": "^2.0.0"
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@@ -809,8 +810,8 @@
       "dev": true,
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-        "jsbn": "0.1.1",
-        "safer-buffer": "2.1.2"
+        "jsbn": "~0.1.0",
+        "safer-buffer": "^2.1.0"
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@@ -825,13 +826,13 @@
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-        "inherits": "2.0.1",
-        "minimalistic-assert": "1.0.1",
-        "minimalistic-crypto-utils": "1.0.1"
+        "bn.js": "^4.4.0",
+        "brorand": "^1.0.1",
+        "hash.js": "^1.0.0",
+        "hmac-drbg": "^1.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
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@@ -846,7 +847,7 @@
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       "dev": true,
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-        "once": "1.4.0"
+        "once": "^1.4.0"
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@@ -855,7 +856,7 @@
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       "dev": true,
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-        "is-arrayish": "0.2.1"
+        "is-arrayish": "^0.2.1"
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@@ -876,11 +877,11 @@
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       "dev": true,
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-        "estraverse": "1.9.3",
-        "esutils": "2.0.2",
-        "optionator": "0.8.2",
-        "source-map": "0.2.0"
+        "esprima": "^2.7.1",
+        "estraverse": "^1.9.1",
+        "esutils": "^2.0.2",
+        "optionator": "^0.8.1",
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@@ -890,7 +891,7 @@
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+            "amdefine": ">=0.0.4"
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@@ -925,8 +926,8 @@
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-        "idna-uts46-hx": "2.3.1",
-        "js-sha3": "0.5.7"
+        "idna-uts46-hx": "^2.3.1",
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@@ -943,13 +944,13 @@
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-        "elliptic": "6.4.1",
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-        "servify": "0.1.12",
-        "ws": "3.3.3",
-        "xhr-request-promise": "0.1.2"
+        "bn.js": "^4.11.6",
+        "elliptic": "^6.4.0",
+        "keccakjs": "^0.2.1",
+        "nano-json-stream-parser": "^0.1.2",
+        "servify": "^0.1.12",
+        "ws": "^3.0.0",
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@@ -958,7 +959,7 @@
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       "dev": true,
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-        "source-map-support": "0.5.9"
+        "source-map-support": "^0.5.3"
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@@ -967,9 +968,9 @@
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-        "@types/node": "10.10.3",
+        "@types/node": "^10.3.2",
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+        "bn.js": "^4.4.0",
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@@ -985,10 +986,10 @@
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-            "brorand": "1.1.0",
-            "hash.js": "1.1.3",
-            "inherits": "2.0.1"
+            "bn.js": "^4.4.0",
+            "brorand": "^1.0.1",
+            "hash.js": "^1.0.0",
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@@ -997,8 +998,8 @@
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-            "inherits": "2.0.3",
-            "minimalistic-assert": "1.0.1"
+            "inherits": "^2.0.3",
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@@ -1023,7 +1024,7 @@
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-          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.1.tgz",
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@@ -1059,8 +1060,8 @@
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-        "md5.js": "1.3.4",
-        "safe-buffer": "5.1.2"
+        "md5.js": "^1.3.4",
+        "safe-buffer": "^5.1.1"
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@@ -1069,13 +1070,13 @@
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-        "p-finally": "1.0.0",
-        "signal-exit": "3.0.2",
-        "strip-eof": "1.0.0"
+        "cross-spawn": "^5.0.1",
+        "get-stream": "^3.0.0",
+        "is-stream": "^1.1.0",
+        "npm-run-path": "^2.0.0",
+        "p-finally": "^1.0.0",
+        "signal-exit": "^3.0.0",
+        "strip-eof": "^1.0.0"
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@@ -1084,36 +1085,36 @@
       "integrity": "sha1-avilAjUNsyRuzEvs9rWjTSL37VM=",
       "dev": true,
       "requires": {
-        "accepts": "1.3.5",
+        "accepts": "~1.3.5",
         "array-flatten": "1.1.1",
         "body-parser": "1.18.2",
         "content-disposition": "0.5.2",
-        "content-type": "1.0.4",
+        "content-type": "~1.0.4",
         "cookie": "0.3.1",
         "cookie-signature": "1.0.6",
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-        "depd": "1.1.2",
-        "encodeurl": "1.0.2",
-        "escape-html": "1.0.3",
-        "etag": "1.8.1",
+        "depd": "~1.1.2",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
         "finalhandler": "1.1.1",
         "fresh": "0.5.2",
         "merge-descriptors": "1.0.1",
-        "methods": "1.1.2",
-        "on-finished": "2.3.0",
-        "parseurl": "1.3.2",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.2",
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-        "proxy-addr": "2.0.4",
+        "proxy-addr": "~2.0.3",
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-        "range-parser": "1.2.0",
+        "range-parser": "~1.2.0",
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         "serve-static": "1.13.2",
         "setprototypeof": "1.1.0",
-        "statuses": "1.4.0",
-        "type-is": "1.6.16",
+        "statuses": "~1.4.0",
+        "type-is": "~1.6.16",
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-        "vary": "1.1.2"
+        "vary": "~1.1.2"
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@@ -1123,15 +1124,15 @@
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-            "content-type": "1.0.4",
+            "content-type": "~1.0.4",
             "debug": "2.6.9",
-            "depd": "1.1.2",
-            "http-errors": "1.6.3",
+            "depd": "~1.1.1",
+            "http-errors": "~1.6.2",
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-            "on-finished": "2.3.0",
+            "on-finished": "~2.3.0",
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             "raw-body": "2.3.2",
-            "type-is": "1.6.16"
+            "type-is": "~1.6.15"
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@@ -1188,7 +1189,7 @@
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                 "setprototypeof": "1.0.3",
-                "statuses": "1.4.0"
+                "statuses": ">= 1.3.1 < 2"
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@@ -1249,7 +1250,7 @@
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       "dev": true,
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-        "pend": "1.2.0"
+        "pend": "~1.2.0"
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@@ -1260,17 +1261,17 @@
     },
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       "version": "1.1.1",
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+        "mime-db": "~1.36.0"
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@@ -2147,7 +2148,7 @@
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       "dev": true,
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-        "dom-walk": "0.1.1"
+        "dom-walk": "^0.1.0"
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@@ -2168,7 +2169,7 @@
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-        "brace-expansion": "1.1.11"
+        "brace-expansion": "^1.1.7"
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@@ -2200,7 +2201,7 @@
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       "dev": true,
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-        "mkdirp": "0.5.1"
+        "mkdirp": "*"
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@@ -2233,12 +2234,12 @@
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-            "inherits": "2.0.1",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
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@@ -2253,7 +2254,7 @@
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+            "has-flag": "^2.0.0"
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@@ -2282,9 +2283,9 @@
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-        "object-assign": "4.1.1",
-        "thenify-all": "1.6.0"
+        "any-promise": "^1.0.0",
+        "object-assign": "^4.0.1",
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@@ -2311,7 +2312,7 @@
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       "dev": true,
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-        "abbrev": "1.0.9"
+        "abbrev": "1"
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@@ -2320,10 +2321,10 @@
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-        "is-builtin-module": "1.0.0",
-        "semver": "5.5.1",
-        "validate-npm-package-license": "3.0.4"
+        "hosted-git-info": "^2.1.4",
+        "is-builtin-module": "^1.0.0",
+        "semver": "2 || 3 || 4 || 5",
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@@ -2332,7 +2333,7 @@
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       "dev": true,
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+        "path-key": "^2.0.0"
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@@ -2377,7 +2378,7 @@
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       "dev": true,
       "requires": {
-        "http-https": "1.0.0"
+        "http-https": "^1.0.0"
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@@ -2395,7 +2396,7 @@
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       "dev": true,
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-        "wrappy": "1.0.2"
+        "wrappy": "1"
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@@ -2404,8 +2405,8 @@
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       "dev": true,
       "requires": {
-        "minimist": "0.0.10",
-        "wordwrap": "0.0.3"
+        "minimist": "~0.0.1",
+        "wordwrap": "~0.0.2"
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@@ -2422,12 +2423,12 @@
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-        "prelude-ls": "1.1.2",
-        "type-check": "0.3.2",
-        "wordwrap": "1.0.0"
+        "deep-is": "~0.1.3",
+        "fast-levenshtein": "~2.0.4",
+        "levn": "~0.3.0",
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2",
+        "wordwrap": "~1.0.0"
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@@ -2442,7 +2443,7 @@
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       "dev": true,
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-        "lcid": "1.0.0"
+        "lcid": "^1.0.0"
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@@ -2463,7 +2464,7 @@
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       "dev": true,
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+        "p-try": "^1.0.0"
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@@ -2472,7 +2473,7 @@
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       "dev": true,
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-        "p-limit": "1.3.0"
+        "p-limit": "^1.1.0"
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@@ -2481,7 +2482,7 @@
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       "dev": true,
       "requires": {
-        "p-finally": "1.0.0"
+        "p-finally": "^1.0.0"
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@@ -2496,11 +2497,11 @@
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-        "browserify-aes": "1.2.0",
-        "create-hash": "1.2.0",
-        "evp_bytestokey": "1.0.3",
-        "pbkdf2": "3.0.16"
+        "asn1.js": "^4.0.0",
+        "browserify-aes": "^1.0.0",
+        "create-hash": "^1.1.0",
+        "evp_bytestokey": "^1.0.0",
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@@ -2509,7 +2510,7 @@
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       "dev": true,
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-        "for-each": "0.3.3",
+        "for-each": "^0.3.2",
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@@ -2519,7 +2520,7 @@
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       "dev": true,
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+        "error-ex": "^1.2.0"
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@@ -2534,7 +2535,7 @@
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       "dev": true,
       "requires": {
-        "pinkie-promise": "2.0.1"
+        "pinkie-promise": "^2.0.0"
       }
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@@ -2561,9 +2562,9 @@
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       "dev": true,
       "requires": {
-        "graceful-fs": "4.1.11",
-        "pify": "2.3.0",
-        "pinkie-promise": "2.0.1"
+        "graceful-fs": "^4.1.2",
+        "pify": "^2.0.0",
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@@ -2572,11 +2573,11 @@
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-        "create-hmac": "1.1.7",
-        "ripemd160": "2.0.2",
-        "safe-buffer": "5.1.2",
-        "sha.js": "2.4.11"
+        "create-hash": "^1.1.2",
+        "create-hmac": "^1.1.4",
+        "ripemd160": "^2.0.1",
+        "safe-buffer": "^5.0.1",
+        "sha.js": "^2.4.8"
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@@ -2615,7 +2616,7 @@
       "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
       "dev": true,
       "requires": {
-        "pinkie": "2.0.4"
+        "pinkie": "^2.0.0"
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@@ -2648,7 +2649,7 @@
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       "dev": true,
       "requires": {
-        "forwarded": "0.1.2",
+        "forwarded": "~0.1.2",
         "ipaddr.js": "1.8.0"
       }
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@@ -2670,11 +2671,11 @@
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-        "browserify-rsa": "4.0.1",
-        "create-hash": "1.2.0",
-        "parse-asn1": "5.1.1",
-        "randombytes": "2.0.6"
+        "bn.js": "^4.1.0",
+        "browserify-rsa": "^4.0.0",
+        "create-hash": "^1.1.0",
+        "parse-asn1": "^5.0.0",
+        "randombytes": "^2.0.1"
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@@ -2695,9 +2696,9 @@
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-        "decode-uri-component": "0.2.0",
-        "object-assign": "4.1.1",
-        "strict-uri-encode": "1.1.0"
+        "decode-uri-component": "^0.2.0",
+        "object-assign": "^4.1.0",
+        "strict-uri-encode": "^1.0.0"
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@@ -2706,7 +2707,7 @@
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       "dev": true,
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-        "safe-buffer": "5.1.2"
+        "safe-buffer": "^5.1.0"
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@@ -2715,8 +2716,8 @@
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       "dev": true,
       "requires": {
-        "randombytes": "2.0.6",
-        "safe-buffer": "5.1.2"
+        "randombytes": "^2.0.5",
+        "safe-buffer": "^5.1.0"
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@@ -2749,9 +2750,9 @@
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       "dev": true,
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-        "load-json-file": "1.1.0",
-        "normalize-package-data": "2.4.0",
-        "path-type": "1.1.0"
+        "load-json-file": "^1.0.0",
+        "normalize-package-data": "^2.3.2",
+        "path-type": "^1.0.0"
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@@ -2760,8 +2761,8 @@
       "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
       "dev": true,
       "requires": {
-        "find-up": "1.1.2",
-        "read-pkg": "1.1.0"
+        "find-up": "^1.0.0",
+        "read-pkg": "^1.0.0"
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@@ -2770,13 +2771,13 @@
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-        "safe-buffer": "5.1.2",
-        "string_decoder": "1.1.1",
-        "util-deprecate": "1.0.2"
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
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@@ -2793,7 +2794,7 @@
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       "dev": true,
       "requires": {
-        "resolve": "1.1.7"
+        "resolve": "^1.1.6"
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@@ -2802,7 +2803,7 @@
       "integrity": "sha1-DXOurpJm5penj3l2AZZ352rPD/8=",
       "dev": true,
       "requires": {
-        "req-from": "1.0.1"
+        "req-from": "^1.0.1"
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@@ -2811,7 +2812,7 @@
       "integrity": "sha1-v4HaUUeUfTLRO5R9wSpYrUWHNQ4=",
       "dev": true,
       "requires": {
-        "resolve-from": "2.0.0"
+        "resolve-from": "^2.0.0"
       }
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@@ -2820,26 +2821,26 @@
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-        "aws4": "1.8.0",
-        "caseless": "0.12.0",
-        "combined-stream": "1.0.7",
-        "extend": "3.0.2",
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-        "form-data": "2.3.2",
-        "har-validator": "5.1.0",
-        "http-signature": "1.2.0",
-        "is-typedarray": "1.0.0",
-        "isstream": "0.1.2",
-        "json-stringify-safe": "5.0.1",
-        "mime-types": "2.1.20",
-        "oauth-sign": "0.9.0",
-        "performance-now": "2.1.0",
-        "qs": "6.5.2",
-        "safe-buffer": "5.1.2",
-        "tough-cookie": "2.4.3",
-        "tunnel-agent": "0.6.0",
-        "uuid": "3.3.2"
+        "aws-sign2": "~0.7.0",
+        "aws4": "^1.8.0",
+        "caseless": "~0.12.0",
+        "combined-stream": "~1.0.6",
+        "extend": "~3.0.2",
+        "forever-agent": "~0.6.1",
+        "form-data": "~2.3.2",
+        "har-validator": "~5.1.0",
+        "http-signature": "~1.2.0",
+        "is-typedarray": "~1.0.0",
+        "isstream": "~0.1.2",
+        "json-stringify-safe": "~5.0.1",
+        "mime-types": "~2.1.19",
+        "oauth-sign": "~0.9.0",
+        "performance-now": "^2.1.0",
+        "qs": "~6.5.2",
+        "safe-buffer": "^5.1.2",
+        "tough-cookie": "~2.4.3",
+        "tunnel-agent": "^0.6.0",
+        "uuid": "^3.3.2"
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@@ -2878,7 +2879,7 @@
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       "dev": true,
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-        "glob": "7.1.3"
+        "glob": "^7.0.5"
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@@ -2887,12 +2888,12 @@
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-            "inflight": "1.0.6",
-            "inherits": "2.0.1",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
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@@ -2903,8 +2904,8 @@
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       "dev": true,
       "requires": {
-        "hash-base": "3.0.4",
-        "inherits": "2.0.1"
+        "hash-base": "^3.0.0",
+        "inherits": "^2.0.1"
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@@ -2913,7 +2914,7 @@
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       "dev": true,
       "requires": {
-        "safe-buffer": "5.1.2"
+        "safe-buffer": "^5.1.1"
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@@ -2934,7 +2935,7 @@
       "integrity": "sha1-BOAUpWgrU/pQwtXM4WfXGcBthw0=",
       "dev": true,
       "requires": {
-        "nan": "2.11.0"
+        "nan": "^2.0.8"
       }
     },
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@@ -2949,8 +2950,8 @@
       "integrity": "sha1-r40UZbcemZARC+38WTuUeeA6ito=",
       "dev": true,
       "requires": {
-        "scrypt": "6.0.3",
-        "scryptsy": "1.2.1"
+        "scrypt": "^6.0.2",
+        "scryptsy": "^1.2.1"
       }
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     "scryptsy": {
@@ -2959,7 +2960,7 @@
       "integrity": "sha1-oyJfpLJST4AnAHYeKFW987LZIWM=",
       "dev": true,
       "requires": {
-        "pbkdf2": "3.0.16"
+        "pbkdf2": "^3.0.3"
       }
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     "seek-bzip": {
@@ -2968,7 +2969,7 @@
       "integrity": "sha1-z+kXyz0nS8/6x5J1ivUxc+sfq9w=",
       "dev": true,
       "requires": {
-        "commander": "2.8.1"
+        "commander": "~2.8.1"
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@@ -2977,7 +2978,7 @@
           "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
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     "strip-dirs": {
@@ -3573,7 +3574,7 @@
       "integrity": "sha512-JOCxOeKLm2CAS73y/U4ZeZPTkE+gNVCzKt7Eox84Iej1LT/2pTWYpZKJuxwQpvX1LiZb1xokNR7RLfuBAa7T3g==",
       "dev": true,
       "requires": {
-        "is-natural-number": "4.0.1"
+        "is-natural-number": "^4.0.1"
       }
     },
     "strip-eof": {
@@ -3597,7 +3598,7 @@
       "integrity": "sha1-ZawFBLOVQXHYpklGsq48u4pfVPY=",
       "dev": true,
       "requires": {
-        "has-flag": "1.0.0"
+        "has-flag": "^1.0.0"
       }
     },
     "swarm-js": {
@@ -3606,19 +3607,19 @@
       "integrity": "sha512-G8gi5fcXP/2upwiuOShJ258sIufBVztekgobr3cVgYXObZwJ5AXLqZn52AI+/ffft29pJexF9WNdUxjlkVehoQ==",
       "dev": true,
       "requires": {
-        "bluebird": "3.5.2",
-        "buffer": "5.2.1",
-        "decompress": "4.2.0",
-        "eth-lib": "0.1.27",
-        "fs-extra": "2.1.2",
-        "fs-promise": "2.0.3",
-        "got": "7.1.0",
-        "mime-types": "2.1.20",
-        "mkdirp-promise": "5.0.1",
-        "mock-fs": "4.7.0",
-        "setimmediate": "1.0.5",
-        "tar.gz": "1.0.7",
-        "xhr-request-promise": "0.1.2"
+        "bluebird": "^3.5.0",
+        "buffer": "^5.0.5",
+        "decompress": "^4.0.0",
+        "eth-lib": "^0.1.26",
+        "fs-extra": "^2.1.2",
+        "fs-promise": "^2.0.0",
+        "got": "^7.1.0",
+        "mime-types": "^2.1.16",
+        "mkdirp-promise": "^5.0.1",
+        "mock-fs": "^4.1.0",
+        "setimmediate": "^1.0.5",
+        "tar.gz": "^1.0.5",
+        "xhr-request-promise": "^0.1.2"
       },
       "dependencies": {
         "fs-extra": {
@@ -3627,8 +3628,8 @@
           "integrity": "sha1-BGxwFjzvmq1GsOSn+kZ/si1x3jU=",
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "jsonfile": "2.4.0"
+            "graceful-fs": "^4.1.2",
+            "jsonfile": "^2.1.0"
           }
         }
       }
@@ -3639,9 +3640,9 @@
       "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=",
       "dev": true,
       "requires": {
-        "block-stream": "0.0.9",
-        "fstream": "1.0.11",
-        "inherits": "2.0.1"
+        "block-stream": "*",
+        "fstream": "^1.0.2",
+        "inherits": "2"
       }
     },
     "tar-stream": {
@@ -3650,13 +3651,13 @@
       "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
       "dev": true,
       "requires": {
-        "bl": "1.2.2",
-        "buffer-alloc": "1.2.0",
-        "end-of-stream": "1.4.1",
-        "fs-constants": "1.0.0",
-        "readable-stream": "2.3.6",
-        "to-buffer": "1.1.1",
-        "xtend": "4.0.1"
+        "bl": "^1.0.0",
+        "buffer-alloc": "^1.2.0",
+        "end-of-stream": "^1.0.0",
+        "fs-constants": "^1.0.0",
+        "readable-stream": "^2.3.0",
+        "to-buffer": "^1.1.1",
+        "xtend": "^4.0.0"
       }
     },
     "tar.gz": {
@@ -3665,11 +3666,11 @@
       "integrity": "sha512-uhGatJvds/3diZrETqMj4RxBR779LKlIE74SsMcn5JProZsfs9j0QBwWO1RW+IWNJxS2x8Zzra1+AW6OQHWphg==",
       "dev": true,
       "requires": {
-        "bluebird": "2.11.0",
-        "commander": "2.17.1",
-        "fstream": "1.0.11",
-        "mout": "0.11.1",
-        "tar": "2.2.1"
+        "bluebird": "^2.9.34",
+        "commander": "^2.8.1",
+        "fstream": "^1.0.8",
+        "mout": "^0.11.0",
+        "tar": "^2.1.1"
       },
       "dependencies": {
         "bluebird": {
@@ -3686,7 +3687,7 @@
       "integrity": "sha1-5p44obq+lpsBCCB5eLn2K4hgSDk=",
       "dev": true,
       "requires": {
-        "any-promise": "1.3.0"
+        "any-promise": "^1.0.0"
       }
     },
     "thenify-all": {
@@ -3695,7 +3696,7 @@
       "integrity": "sha1-GhkY1ALY/D+Y+/I02wvMjMEOlyY=",
       "dev": true,
       "requires": {
-        "thenify": "3.3.0"
+        "thenify": ">= 3.1.0 < 4"
       }
     },
     "through": {
@@ -3722,8 +3723,8 @@
       "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
       "dev": true,
       "requires": {
-        "psl": "1.1.29",
-        "punycode": "1.4.1"
+        "psl": "^1.1.24",
+        "punycode": "^1.4.1"
       }
     },
     "tree-kill": {
@@ -3744,9 +3745,9 @@
       "integrity": "sha512-D15MsJeKWRNxbx2Vmy50gH8z4gjBYecJIUADBBBL593hkVnhZ1ADgkIujCvvrbD6Pj69Vg5Ky/nJXl7M9TCjsg==",
       "dev": true,
       "requires": {
-        "mocha": "4.1.0",
+        "mocha": "^4.1.0",
         "original-require": "1.0.1",
-        "solc": "0.5.0"
+        "solc": "^0.5.0"
       }
     },
     "tunnel-agent": {
@@ -3755,7 +3756,7 @@
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
       "dev": true,
       "requires": {
-        "safe-buffer": "5.1.2"
+        "safe-buffer": "^5.0.1"
       }
     },
     "tweetnacl": {
@@ -3771,7 +3772,7 @@
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
       "dev": true,
       "requires": {
-        "prelude-ls": "1.1.2"
+        "prelude-ls": "~1.1.2"
       }
     },
     "type-is": {
@@ -3781,7 +3782,7 @@
       "dev": true,
       "requires": {
         "media-typer": "0.3.0",
-        "mime-types": "2.1.20"
+        "mime-types": "~2.1.18"
       }
     },
     "typedarray-to-buffer": {
@@ -3790,7 +3791,7 @@
       "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
       "dev": true,
       "requires": {
-        "is-typedarray": "1.0.0"
+        "is-typedarray": "^1.0.0"
       }
     },
     "uglify-js": {
@@ -3800,8 +3801,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "commander": "2.17.1",
-        "source-map": "0.6.1"
+        "commander": "~2.17.1",
+        "source-map": "~0.6.1"
       }
     },
     "ultron": {
@@ -3816,8 +3817,8 @@
       "integrity": "sha512-kE2WkurNnPUMcryNioS68DDbhoPB8Qxsd8btHSj+sd5Pjh2GsjmeHLzMSqV9HHziAo8FzVxVCJl9ZYhk7yY1pA==",
       "dev": true,
       "requires": {
-        "buffer": "3.6.0",
-        "through": "2.3.8"
+        "buffer": "^3.0.1",
+        "through": "^2.3.6"
       },
       "dependencies": {
         "base64-js": {
@@ -3833,8 +3834,8 @@
           "dev": true,
           "requires": {
             "base64-js": "0.0.8",
-            "ieee754": "1.1.12",
-            "isarray": "1.0.0"
+            "ieee754": "^1.1.4",
+            "isarray": "^1.0.0"
           }
         }
       }
@@ -3857,7 +3858,7 @@
       "integrity": "sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=",
       "dev": true,
       "requires": {
-        "prepend-http": "1.0.4"
+        "prepend-http": "^1.0.1"
       }
     },
     "url-set-query": {
@@ -3911,8 +3912,8 @@
       "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
       "dev": true,
       "requires": {
-        "spdx-correct": "3.0.0",
-        "spdx-expression-parse": "3.0.0"
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
       }
     },
     "vary": {
@@ -3927,9 +3928,9 @@
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
       "requires": {
-        "assert-plus": "1.0.0",
+        "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
-        "extsprintf": "1.3.0"
+        "extsprintf": "^1.2.0"
       }
     },
     "web3": {
@@ -4084,14 +4085,14 @@
           "integrity": "sha1-L5Pxex4jrsN1nNSj/iDBKGo/wco=",
           "dev": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "elliptic": "6.4.1",
-            "xhr-request-promise": "0.1.2"
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "xhr-request-promise": "^0.1.2"
           }
         },
         "uuid": {
           "version": "2.0.1",
-          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.1.tgz",
           "integrity": "sha1-wqMN7bPlNdcsz4LjQ5QaULqFM6w=",
           "dev": true
         }
@@ -4246,12 +4247,13 @@
     },
     "websocket": {
       "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
+      "from": "websocket@git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
       "dev": true,
       "requires": {
-        "debug": "2.6.9",
-        "nan": "2.11.0",
-        "typedarray-to-buffer": "3.1.5",
-        "yaeti": "0.0.6"
+        "debug": "^2.2.0",
+        "nan": "^2.3.3",
+        "typedarray-to-buffer": "^3.1.2",
+        "yaeti": "^0.0.6"
       },
       "dependencies": {
         "debug": {
@@ -4271,7 +4273,7 @@
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
@@ -4298,8 +4300,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       }
     },
     "wrappy": {
@@ -4314,9 +4316,9 @@
       "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
       "dev": true,
       "requires": {
-        "async-limiter": "1.0.0",
-        "safe-buffer": "5.1.2",
-        "ultron": "1.1.1"
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
       }
     },
     "xhr": {
@@ -4325,10 +4327,10 @@
       "integrity": "sha512-4nlO/14t3BNUZRXIXfXe+3N6w3s1KoxcJUUURctd64BLRe67E4gRwp4PjywtDY72fXpZ1y6Ch0VZQRY/gMPzzQ==",
       "dev": true,
       "requires": {
-        "global": "4.3.2",
-        "is-function": "1.0.1",
-        "parse-headers": "2.0.1",
-        "xtend": "4.0.1"
+        "global": "~4.3.0",
+        "is-function": "^1.0.1",
+        "parse-headers": "^2.0.0",
+        "xtend": "^4.0.0"
       }
     },
     "xhr-request": {
@@ -4337,13 +4339,13 @@
       "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
       "dev": true,
       "requires": {
-        "buffer-to-arraybuffer": "0.0.5",
-        "object-assign": "4.1.1",
-        "query-string": "5.1.1",
-        "simple-get": "2.8.1",
-        "timed-out": "4.0.1",
-        "url-set-query": "1.0.0",
-        "xhr": "2.5.0"
+        "buffer-to-arraybuffer": "^0.0.5",
+        "object-assign": "^4.1.1",
+        "query-string": "^5.0.1",
+        "simple-get": "^2.7.0",
+        "timed-out": "^4.0.1",
+        "url-set-query": "^1.0.0",
+        "xhr": "^2.0.4"
       }
     },
     "xhr-request-promise": {
@@ -4352,7 +4354,7 @@
       "integrity": "sha1-NDxE0e53JrhkgGloLQ+EDIO0Jh0=",
       "dev": true,
       "requires": {
-        "xhr-request": "1.1.0"
+        "xhr-request": "^1.0.1"
       }
     },
     "xhr2": {
@@ -4367,7 +4369,7 @@
       "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
       "dev": true,
       "requires": {
-        "cookiejar": "2.1.2"
+        "cookiejar": "^2.1.1"
       }
     },
     "xmlhttprequest": {
@@ -4406,20 +4408,20 @@
       "integrity": "sha1-wMQpJMpKqmsObaFznfshZDn53cA=",
       "dev": true,
       "requires": {
-        "cliui": "3.2.0",
-        "decamelize": "1.2.0",
-        "get-caller-file": "1.0.3",
-        "lodash.assign": "4.2.0",
-        "os-locale": "1.4.0",
-        "read-pkg-up": "1.0.1",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "1.0.2",
-        "which-module": "1.0.0",
-        "window-size": "0.2.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "2.4.1"
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "lodash.assign": "^4.0.3",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.1",
+        "which-module": "^1.0.0",
+        "window-size": "^0.2.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^2.4.1"
       }
     },
     "yargs-parser": {
@@ -4428,8 +4430,8 @@
       "integrity": "sha1-hVaN488VD/SfpRgl8DqMiA3cxcQ=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0",
-        "lodash.assign": "4.2.0"
+        "camelcase": "^3.0.0",
+        "lodash.assign": "^4.0.6"
       }
     },
     "yauzl": {
@@ -4438,8 +4440,8 @@
       "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
       "dev": true,
       "requires": {
-        "buffer-crc32": "0.2.13",
-        "fd-slicer": "1.1.0"
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
       }
     }
   }
diff --git a/test/lib/organization/complete_ownership_transfer.js b/test/lib/organization/complete_ownership_transfer.js
new file mode 100644
index 00000000..372fed66
--- /dev/null
+++ b/test/lib/organization/complete_ownership_transfer.js
@@ -0,0 +1,83 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the 'License');
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an 'AS IS' BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const Utils = require('../../test_lib/utils.js');
+const EventsDecoder = require('../../test_lib/event_decoder.js');
+
+const Organization = artifacts.require('Organization');
+
+contract('Organization.completeOwnershipTransfer()', async (accounts) => {
+
+  let owner = accounts[0];
+  let proposedOwner = accounts[1];
+  let organization = null;
+
+  beforeEach(async function () {
+    organization = await Organization.new({ from: owner });
+    await organization.initiateOwnershipTransfer(
+      proposedOwner,
+      { from: owner },
+    )
+  });
+
+  it('reverts when caller is not proposed owner', async () => {
+    await Utils.expectRevert(
+      organization.completeOwnershipTransfer({ from: owner }),
+      'Caller is not proposed owner address.',
+    );
+  });
+
+  it('should pass when caller is proposed owner', async () => {
+    let response = await organization.completeOwnershipTransfer.call(
+      { from: proposedOwner }
+    );
+    assert.strictEqual(
+      response,
+      true,
+      'The ownership completion should return true.',
+    );
+
+    await organization.completeOwnershipTransfer({ from: proposedOwner });
+
+    assert.strictEqual(
+      await organization.owner.call(),
+      proposedOwner,
+      'The owner must now be the proposed owner.',
+    );
+    assert.strictEqual(
+      await organization.proposedOwner.call(),
+      '0x0000000000000000000000000000000000000000',
+      'The proposed owner must be 0 after it became the owner.',
+    );
+  });
+
+  it('verifies emitting of OwnershipTransferCompleted event', async () => {
+    const transaction = await organization.completeOwnershipTransfer(
+      { from: proposedOwner },
+    );
+
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    assert.strictEqual(
+      events.OwnershipTransferCompleted.newOwner,
+      proposedOwner,
+      'The emitted event does not record the new owner.',
+    );
+
+  });
+
+});
diff --git a/test/lib/organization/constructor.js b/test/lib/organization/constructor.js
new file mode 100644
index 00000000..be42616e
--- /dev/null
+++ b/test/lib/organization/constructor.js
@@ -0,0 +1,30 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const Organization = artifacts.require('Organization');
+
+contract('Organization.constructor()', async (accounts) => {
+
+  let owner = accounts[0];
+
+  it('checks that organization owner is set to creator', async () => {
+    organization = await Organization.new({ from: owner });
+    let setOwner = await organization.owner.call();
+    assert.strictEqual(
+      setOwner,
+      owner,
+      'The initial owner of an organization must be its creator.'
+    );
+  });
+});
diff --git a/test/lib/organization/initiate_ownership_transfer.js b/test/lib/organization/initiate_ownership_transfer.js
new file mode 100644
index 00000000..817cd9d8
--- /dev/null
+++ b/test/lib/organization/initiate_ownership_transfer.js
@@ -0,0 +1,103 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const Utils = require('../../test_lib/utils.js');
+const EventsDecoder = require('../../test_lib/event_decoder.js');
+
+const Organization = artifacts.require('Organization');
+
+contract('Organization.initiateOwnershipTransfer()', async (accounts) => {
+
+  let owner = accounts[0];
+  let proposedOwner = accounts[1];
+  let organization = null;
+
+  beforeEach(async function () {
+    organization = await Organization.new({ from: owner });
+  });
+
+  it('reverts when caller is not owner', async () => {
+    await Utils.expectRevert(
+      organization.initiateOwnershipTransfer(
+        proposedOwner,
+        { from: proposedOwner },
+      ),
+      'Only owner is allowed to call.',
+    );
+  });
+
+  it('reverts when proposed owner is same as owner', async () => {
+    await Utils.expectRevert(
+      organization.initiateOwnershipTransfer(
+        owner,
+        { from: owner },
+      ),
+      'Proposed owner address can\'t be current owner address.',
+    );
+  });
+
+  it('should pass when valid proposed owner is passed', async () => {
+    let response = await organization.initiateOwnershipTransfer.call(
+      proposedOwner,
+      { from: owner },
+    );
+    assert.strictEqual(
+      response,
+      true,
+      'The ownership initiation should return true.',
+    );
+
+    await organization.initiateOwnershipTransfer(
+      proposedOwner,
+      { from: owner },
+    );
+
+    assert.strictEqual(
+      await organization.proposedOwner.call(),
+      proposedOwner,
+      'Must accept a valid owner proposal.',
+    );
+  });
+
+  it('should pass when proposed address is 0', async () => {
+    await organization.initiateOwnershipTransfer(
+      '0x0000000000000000000000000000000000000000',
+      { from: owner },
+    );
+    assert.strictEqual(
+      await organization.proposedOwner.call(),
+      '0x0000000000000000000000000000000000000000',
+      'Proposed 0-address must be accepted.'
+    );
+  });
+
+  it('verifies emitting of OwnershipTransferInitiated event', async () => {
+    const transaction = await organization.initiateOwnershipTransfer(
+      proposedOwner,
+      { from: owner },
+    );
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    assert.strictEqual(
+      events.OwnershipTransferInitiated.proposedOwner,
+      proposedOwner,
+      'The event does not emit the correct proposed owner.',
+    );
+
+  });
+
+});
diff --git a/test/lib/organization/is_worker.js b/test/lib/organization/is_worker.js
new file mode 100644
index 00000000..1d0bc9dd
--- /dev/null
+++ b/test/lib/organization/is_worker.js
@@ -0,0 +1,80 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const Utils = require('../../test_lib/utils.js');
+const Organization = artifacts.require('Organization');
+
+contract('Organization.isWorker()', async (accounts) => {
+
+  let owner = accounts[0];
+  let worker = accounts[0];
+  let organization = null;
+
+  beforeEach(async function () {
+    organization = await Organization.new({ from: owner });
+  });
+
+  it('should return false if the worker wasn\'t set', async () => {
+    assert.strictEqual(
+      await organization.isWorker.call(worker),
+      false,
+      'An address that was never registered should not return as valid',
+    );
+  });
+
+  it('should return false if the worker has expired', async () => {
+    let deltaExpirationHeight = 2;
+    let blockNumber = await web3.eth.getBlockNumber();
+    let expirationHeight = blockNumber + deltaExpirationHeight;
+    await organization.setWorker(worker, expirationHeight, { from: owner });
+
+    // Dummy Transaction to increase block number.
+    for (let i = 0; i < deltaExpirationHeight; i++) {
+      await Utils.advanceBlock();
+    }
+    assert.strictEqual(
+      await organization.isWorker.call(worker),
+      false,
+      'The worker should not be active anymore after it expired.',
+    );
+  });
+
+  it('Checks for added worker, isWorker returns true.', async () => {
+    let deltaExpirationHeight = 15;
+    let blockNumber = await web3.eth.getBlockNumber();
+    // `+ 1` as we are now one block further then what getBlockNumber returned.
+    let expirationHeight = blockNumber + deltaExpirationHeight + 1;
+    await organization.setWorker(worker, expirationHeight, { from: owner });
+
+    /*
+     * Check for all relevant blocks. Minus one, because expiration must be
+     * less than current block height.
+     */
+    for (let i = 0; i < (deltaExpirationHeight - 1); i++) {
+      assert.strictEqual(
+        await organization.isWorker.call(worker),
+        true,
+        'The worker should be active at this height.',
+      );
+      Utils.advanceBlock();
+    }
+
+    assert.strictEqual(
+      await organization.isWorker.call(worker),
+      false,
+      'The worker should now be expired.',
+    );
+  });
+
+});
diff --git a/test/lib/organization/set_admin.js b/test/lib/organization/set_admin.js
new file mode 100644
index 00000000..1c60d712
--- /dev/null
+++ b/test/lib/organization/set_admin.js
@@ -0,0 +1,142 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const Utils = require('../../test_lib/utils.js');
+const EventsDecoder = require('../../test_lib/event_decoder');
+
+const Organization = artifacts.require('Organization');
+
+contract('Organization.setAdmin()', async (accounts) => {
+
+  let owner = accounts[0];
+  let admin = accounts[1];
+  let organization = null;
+
+  beforeEach(async function () {
+    organization = await Organization.new({ from: owner });
+  });
+
+  it('reverts when caller is not owner/admin', async () => {
+
+    await Utils.expectRevert(
+      organization.setAdmin(
+        admin,
+        { from: accounts[2] },
+      ),
+      'Only owner and admin are allowed to call this method.',
+    );
+  });
+
+  it('reverts when admin is same as owner', async () => {
+
+    await Utils.expectRevert(
+      organization.setAdmin(
+        owner,
+        { from: owner },
+      ),
+      'Admin address can\'t be the same as the owner address.',
+    );
+
+  });
+
+  it('should pass when valid admin is passed by owner', async () => {
+    const admin = accounts[2];
+    await organization.setAdmin(
+      admin,
+      { from: owner },
+    );
+
+    assert.strictEqual(
+      await organization.admin.call(),
+      admin,
+      'The organization should now have the right admin set.',
+    );
+  });
+
+  it('should pass when valid admin is passed by admin', async () => {
+    await organization.setAdmin(
+      admin,
+      { from: owner },
+    );
+    let newAdmin = accounts[3];
+    await organization.setAdmin(
+      newAdmin,
+      { from: admin },
+    );
+
+    assert.strictEqual(
+      await organization.admin.call(),
+      newAdmin,
+      'The admin should now be the newly set admin.',
+    );
+  });
+
+  it('should pass when admin address is 0x', async () => {
+    await organization.setAdmin(
+      '0x0000000000000000000000000000000000000000',
+      { from: owner },
+    );
+
+    assert.strictEqual(
+      await organization.admin.call(),
+      '0x0000000000000000000000000000000000000000',
+      'The admin address must be set to 0x correctly.'
+    );
+  });
+
+  it('verifies emitting of AdminAddressChanged event', async () => {
+    const transaction = await organization.setAdmin(
+      admin,
+      { from: owner },
+    );
+
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    assert.strictEqual(
+      events.AdminAddressChanged.newAdmin,
+      admin,
+      'The event should emit the correct admin address.'
+    );
+
+  });
+
+  it('Should not emit an event when the address did not change', async () => {
+    await organization.setAdmin(admin, { from: owner });
+
+    /*
+     * The address was already set before. This should pass, but not emit an
+     * event.
+     */
+    const transaction = await organization.setAdmin(
+      admin,
+      { from: owner },
+    );
+
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    assert.strictEqual(
+      events.AdminAddressChanged,
+      undefined,
+      'The event should not be emitted when the address does not change.'
+    );
+
+  });
+
+});
diff --git a/test/lib/organization/set_worker.js b/test/lib/organization/set_worker.js
new file mode 100644
index 00000000..c1e9e885
--- /dev/null
+++ b/test/lib/organization/set_worker.js
@@ -0,0 +1,147 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const web3 = require('../../test_lib/web3.js');
+
+const Utils = require('../../test_lib/utils.js');
+const EventsDecoder = require('../../test_lib/event_decoder.js');
+
+const Organization = artifacts.require('Organization');
+
+contract('Organization.setWorker()', async (accounts) => {
+
+  let owner = accounts[0];
+  let admin = accounts[1];
+  let worker = accounts[2];
+  let expirationHeightDelta = 10;
+
+  let organization = null;
+  let expirationHeight = 0;
+
+  beforeEach(async function () {
+    organization = await Organization.new({ from: owner });
+    await organization.setAdmin(admin, { from: owner });
+    expirationHeight = (await web3.eth.getBlockNumber()) + 10;
+  });
+
+  it('reverts when caller is not owner/admin', async () => {
+
+    await Utils.expectRevert(
+      organization.setWorker(
+        worker,
+        expirationHeight,
+        { from: accounts[3] },
+      ),
+      'Only owner and admin are allowed to call this method.',
+    );
+  });
+
+  it('reverts when worker address is null', async () => {
+
+    await Utils.expectRevert(
+      organization.setWorker(
+        '0x0000000000000000000000000000000000000000',
+        expirationHeight,
+        { from: owner },
+      ),
+      'Worker address cannot be null.',
+    );
+
+  });
+
+  it('reverts when expiration height is expired', async () => {
+
+    const blockNumber = await web3.eth.getBlockNumber();
+    const expirationHeight = blockNumber + expirationHeightDelta;
+    for (let i = 0; i < expirationHeightDelta; i++) {
+      await Utils.advanceBlock();
+    }
+
+    // Checking that worker key has expired.
+    assert.strictEqual(
+      (await organization.isWorker.call(worker)),
+      false,
+      'The worker was expected to be expired.',
+    );
+    await Utils.expectRevert(
+      organization.setWorker(
+        worker,
+        expirationHeight,
+        { from: owner },
+      ),
+      'Expiration height must be in the future.',
+    );
+
+  });
+
+  it('should pass when owner adds a worker with valid expiration height', async () => {
+
+    await organization.setWorker(
+      worker,
+      expirationHeight,
+      { from: owner },
+    );
+    assert(
+      (await organization.workers.call(worker)).eqn(expirationHeight),
+      'The recorded expiration height should equal the given one.',
+    );
+
+  });
+
+  it('should pass when admin adds a worker with valid expiration height', async () => {
+    await organization.setWorker(
+      worker,
+      expirationHeight,
+      { from: admin },
+    );
+    assert(
+      (await organization.workers.call(worker)).eqn(expirationHeight),
+      'The recorded expiration height should equal the given one.',
+    );
+
+  });
+
+  it('verifies emitting of WorkerSet event', async () => {
+
+    const transaction = await organization.setWorker(
+      worker,
+      expirationHeight,
+      { from: owner },
+    );
+
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    let currentBlockNumber = await web3.eth.getBlockNumber();
+    let remainingHeight = expirationHeight - currentBlockNumber;
+
+    assert.strictEqual(
+      events.WorkerSet.worker,
+      worker,
+      'Event must emit correct worker.',
+    );
+    assert(
+      events.WorkerSet.expirationHeight.eqn(expirationHeight),
+      'Event must emit correct expiration height.',
+    );
+    assert(
+      events.WorkerSet.remainingHeight.eqn(remainingHeight),
+      'Event must emit correct remaining height.',
+    );
+
+  });
+
+});
diff --git a/test/lib/organization/unset_worker.js b/test/lib/organization/unset_worker.js
new file mode 100644
index 00000000..9b82a7b5
--- /dev/null
+++ b/test/lib/organization/unset_worker.js
@@ -0,0 +1,125 @@
+// Copyright 2018 OpenST Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+const web3 = require('../../test_lib/web3.js');
+
+const Utils = require('../../test_lib/utils.js');
+const EventsDecoder = require('../../test_lib/event_decoder.js');
+
+const Organization = artifacts.require('Organization');
+
+contract('Organization.unsetWorker()', async (accounts) => {
+
+  let owner = accounts[0];
+  let worker = accounts[1];
+  let admin = accounts[2];
+
+  let organization = null;
+
+  beforeEach(async function () {
+    organization = await Organization.new({ from: owner });
+    expirationHeight = (await web3.eth.getBlockNumber()) + 10;
+    await organization.setWorker(worker, expirationHeight, { from: owner });
+  });
+
+  it('reverts when caller is not owner/admin', async () => {
+
+    await Utils.expectRevert(
+      organization.unsetWorker(
+        worker,
+        { from: accounts[4] },
+      ),
+      'Only owner and admin are allowed to call this method.',
+    );
+
+  });
+
+  it('should pass when owner unsets/deactivates a worker', async () => {
+    await organization.unsetWorker(
+      worker,
+      { from: owner },
+    );
+
+    let returnedWorker = await organization.workers.call(worker);
+    assert(
+      returnedWorker.eqn(0),
+      'Worker should be reset to zero.',
+    );
+
+  });
+
+  it('should pass when admin unsets/deactivates a worker', async () => {
+    await organization.setAdmin(admin, { from: owner });
+    await organization.unsetWorker(
+      worker,
+      { from: admin },
+    );
+
+    let returnedWorker = await organization.workers.call(worker);
+    assert(
+      returnedWorker.eqn(0),
+      'Worker should be reset to zero.',
+    );
+
+  });
+
+  it('emits an unsetWorker event when worker is present', async () => {
+    await organization.setWorker(worker, expirationHeight, { from: owner });
+    const transaction = await organization.unsetWorker(
+      worker,
+      { from: owner },
+    );
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    assert.strictEqual(
+      events.WorkerUnset.worker,
+      worker,
+      'The event should list the worker that was unset.',
+    );
+    assert.strictEqual(
+      events.WorkerUnset.wasSet,
+      true,
+      'The event should list the worker as previously set.',
+    );
+
+  });
+
+  it('emits an unsetWorker event when worker is not present', async () => {
+    let nonSetWorker = accounts[4];
+    const transaction = await organization.unsetWorker(
+      nonSetWorker,
+      { from: owner },
+    );
+    const events = EventsDecoder.getEvents(
+      transaction,
+      organization,
+    );
+
+    assert.strictEqual(
+      events.WorkerUnset.worker,
+      nonSetWorker,
+      'The event should list the worker that was unset.',
+    );
+    assert.strictEqual(
+      events.WorkerUnset.wasSet,
+      false,
+      'The event should not list the worker as previously set.',
+    );
+
+  });
+
+});
diff --git a/test/test_lib/utils.js b/test/test_lib/utils.js
index c7d83816..7d444c4a 100644
--- a/test/test_lib/utils.js
+++ b/test/test_lib/utils.js
@@ -242,6 +242,16 @@ Utils.prototype = {
     });
   },
 
+  advanceBlock: async () => {
+    await web3.currentProvider.send({
+      jsonrpc: '2.0',
+      method: 'evm_mine',
+      id: new Date().getTime(),
+    }, (err) => {
+      assert.strictEqual(err, null);
+    });
+  },
+
   //Get latest hash
   generateHashLock: () => {
     return hashLock.getHashLock();