diff --git a/cli.js b/cli.js
index a0db85c..e73029a 100755
--- a/cli.js
+++ b/cli.js
@@ -9,7 +9,7 @@ const snarkjs = require('snarkjs')
 const crypto = require('crypto')
 const circomlib = require('circomlib')
 const bigInt = snarkjs.bigInt
-const merkleTree = require('./lib/MerkleTree')
+const merkleTree = require('fixed-merkle-tree')
 const Web3 = require('web3')
 const Web3HttpProvider = require('web3-providers-http');
 const buildGroth16 = require('websnark/src/groth16')
@@ -232,7 +232,7 @@ async function generateMerkleProof(deposit, currency, amount) {
   const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)
 
   // Validate that our data is correct
-  const root = await tree.root()
+  const root = tree.root()
   const isValidRoot = await tornadoContract.methods.isKnownRoot(toHex(root)).call()
   const isSpent = await tornadoContract.methods.isSpent(toHex(deposit.nullifierHash)).call()
   assert(isValidRoot === true, 'Merkle tree is corrupted')
@@ -240,7 +240,8 @@ async function generateMerkleProof(deposit, currency, amount) {
   assert(leafIndex >= 0, 'The deposit is not found in the tree')
 
   // Compute merkle proof of our commitment
-  return tree.path(leafIndex)
+  const { pathElements, pathIndices } = tree.path(leafIndex)
+  return { root, pathElements, pathIndices }
 }
 
 /**
@@ -253,7 +254,7 @@ async function generateMerkleProof(deposit, currency, amount) {
  */
 async function generateProof({ deposit, currency, amount, recipient, relayerAddress = 0, fee = 0, refund = 0 }) {
   // Compute merkle proof of our commitment
-  const { root, path_elements, path_index } = await generateMerkleProof(deposit, currency, amount)
+  const { root, pathElements, pathIndices } = await generateMerkleProof(deposit, currency, amount)
 
   // Prepare circuit input
   const input = {
@@ -268,8 +269,8 @@ async function generateProof({ deposit, currency, amount, recipient, relayerAddr
     // Private snark inputs
     nullifier: deposit.nullifier,
     secret: deposit.secret,
-    pathElements: path_elements,
-    pathIndices: path_index
+    pathElements: pathElements,
+    pathIndices: pathIndices
   }
 
   console.log('Generating SNARK proof')
diff --git a/lib/MerkleTree.js b/lib/MerkleTree.js
deleted file mode 100644
index af26b6d..0000000
--- a/lib/MerkleTree.js
+++ /dev/null
@@ -1,195 +0,0 @@
-const jsStorage = require('./Storage')
-const hasherImpl = require('./MiMC')
-
-class MerkleTree {
-
-  constructor(n_levels, defaultElements, prefix, storage, hasher) {
-    this.prefix = prefix
-    this.storage = storage || new jsStorage()
-    this.hasher = hasher || new hasherImpl()
-    this.n_levels = n_levels
-    this.zero_values = []
-    this.totalElements = 0
-
-    let current_zero_value = '21663839004416932945382355908790599225266501822907911457504978515578255421292'
-    this.zero_values.push(current_zero_value)
-    for (let i = 0; i < n_levels; i++) {
-      current_zero_value = this.hasher.hash(i, current_zero_value, current_zero_value)
-      this.zero_values.push(
-        current_zero_value.toString(),
-      )
-    }
-    if (defaultElements) {
-      let level = 0
-      this.totalElements = defaultElements.length
-      defaultElements.forEach((element, i) => {
-        this.storage.put(MerkleTree.index_to_key(prefix, level, i), element)
-      })
-      level++
-      let numberOfElementsInLevel = Math.ceil(defaultElements.length / 2)
-      for (level; level <= this.n_levels; level++) {
-        for(let i = 0; i < numberOfElementsInLevel; i++) {
-          const leftKey = MerkleTree.index_to_key(prefix, level - 1, 2 * i)
-          const rightKey = MerkleTree.index_to_key(prefix, level - 1, 2 * i + 1)
-
-          const left = this.storage.get(leftKey)
-          const right = this.storage.get_or_element(rightKey, this.zero_values[level - 1])
-
-          const subRoot = this.hasher.hash(null, left, right)
-          this.storage.put(MerkleTree.index_to_key(prefix, level, i), subRoot)
-        }
-        numberOfElementsInLevel = Math.ceil(numberOfElementsInLevel / 2)
-      }
-    }
-  }
-
-  static index_to_key(prefix, level, index) {
-    const key = `${prefix}_tree_${level}_${index}`
-    return key
-  }
-
-  async root() {
-    let root = await this.storage.get_or_element(
-      MerkleTree.index_to_key(this.prefix, this.n_levels, 0),
-      this.zero_values[this.n_levels],
-    )
-
-    return root
-  }
-
-  async path(index) {
-    class PathTraverser {
-      constructor(prefix, storage, zero_values) {
-        this.prefix = prefix
-        this.storage = storage
-        this.zero_values = zero_values
-        this.path_elements = []
-        this.path_index = []
-      }
-
-      async handle_index(level, element_index, sibling_index) {
-        const sibling = await this.storage.get_or_element(
-          MerkleTree.index_to_key(this.prefix, level, sibling_index),
-          this.zero_values[level],
-        )
-        this.path_elements.push(sibling)
-        this.path_index.push(element_index % 2)
-      }
-    }
-    index = Number(index)
-    let traverser = new PathTraverser(this.prefix, this.storage, this.zero_values)
-    const root = await this.storage.get_or_element(
-      MerkleTree.index_to_key(this.prefix, this.n_levels, 0),
-      this.zero_values[this.n_levels],
-    )
-
-    const element = await this.storage.get_or_element(
-      MerkleTree.index_to_key(this.prefix, 0, index),
-      this.zero_values[0],
-    )
-
-    await this.traverse(index, traverser)
-    return {
-      root,
-      path_elements: traverser.path_elements,
-      path_index: traverser.path_index,
-      element
-    }
-  }
-
-  async update(index, element, insert = false) {
-    if (!insert && index >= this.totalElements) {
-      throw Error('Use insert method for new elements.')
-    } else if(insert && index < this.totalElements) {
-      throw Error('Use update method for existing elements.')
-    }
-    try {
-      class UpdateTraverser {
-        constructor(prefix, storage, hasher, element, zero_values) {
-          this.prefix = prefix
-          this.current_element = element
-          this.zero_values = zero_values
-          this.storage = storage
-          this.hasher = hasher
-          this.key_values_to_put = []
-        }
-
-        async handle_index(level, element_index, sibling_index) {
-          if (level == 0) {
-            this.original_element = await this.storage.get_or_element(
-              MerkleTree.index_to_key(this.prefix, level, element_index),
-              this.zero_values[level],
-            )
-          }
-          const sibling = await this.storage.get_or_element(
-            MerkleTree.index_to_key(this.prefix, level, sibling_index),
-            this.zero_values[level],
-          )
-          let left, right
-          if (element_index % 2 == 0) {
-            left = this.current_element
-            right = sibling
-          } else {
-            left = sibling
-            right = this.current_element
-          }
-
-          this.key_values_to_put.push({
-            key: MerkleTree.index_to_key(this.prefix, level, element_index),
-            value: this.current_element,
-          })
-          this.current_element = this.hasher.hash(level, left, right)
-        }
-      }
-      let traverser = new UpdateTraverser(
-        this.prefix,
-        this.storage,
-        this.hasher,
-        element,
-        this.zero_values
-      )
-
-      await this.traverse(index, traverser)
-      traverser.key_values_to_put.push({
-        key: MerkleTree.index_to_key(this.prefix, this.n_levels, 0),
-        value: traverser.current_element,
-      })
-
-      await this.storage.put_batch(traverser.key_values_to_put)
-    } catch(e) {
-      console.error(e)
-    }
-  }
-
-  async insert(element) {
-    const index = this.totalElements
-    await this.update(index, element, true)
-    this.totalElements++
-  }
-
-  async traverse(index, handler) {
-    let current_index = index
-    for (let i = 0; i < this.n_levels; i++) {
-      let sibling_index = current_index
-      if (current_index % 2 == 0) {
-        sibling_index += 1
-      } else {
-        sibling_index -= 1
-      }
-      await handler.handle_index(i, current_index, sibling_index)
-      current_index = Math.floor(current_index / 2)
-    }
-  }
-
-  getIndexByElement(element) {
-    for(let i = this.totalElements - 1; i >= 0; i--) {
-      const elementFromTree = this.storage.get(MerkleTree.index_to_key(this.prefix, 0, i))
-      if (elementFromTree === element) {
-        return i
-      }
-    }
-    return false
-  }
-}
-
-module.exports = MerkleTree
diff --git a/lib/MiMC.js b/lib/MiMC.js
deleted file mode 100644
index d070373..0000000
--- a/lib/MiMC.js
+++ /dev/null
@@ -1,13 +0,0 @@
-const circomlib = require('circomlib')
-const mimcsponge = circomlib.mimcsponge
-const snarkjs = require('snarkjs')
-
-const bigInt = snarkjs.bigInt
-
-class MimcSpongeHasher {
-  hash(level, left, right) {
-    return mimcsponge.multiHash([bigInt(left), bigInt(right)]).toString()
-  }
-}
-
-module.exports = MimcSpongeHasher
diff --git a/lib/Storage.js b/lib/Storage.js
deleted file mode 100644
index 52b97d6..0000000
--- a/lib/Storage.js
+++ /dev/null
@@ -1,39 +0,0 @@
-
-
-class JsStorage {
-  constructor() {
-    this.db = {}
-  }
-
-  get(key) {
-    return this.db[key]
-  }
-
-  get_or_element(key, defaultElement) {
-    const element = this.db[key]
-    if (element === undefined) {
-      return defaultElement
-    } else {
-      return element
-    }
-  }
-
-  put(key, value) {
-    if (key === undefined || value === undefined) {
-      throw Error('key or value is undefined')
-    }
-    this.db[key] = value
-  }
-
-  del(key) {
-    delete this.db[key]
-  }
-
-  put_batch(key_values) {
-    key_values.forEach(element => {
-      this.db[element.key] = element.value
-    })
-  }
-}
-
-module.exports = JsStorage
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/.gitignore b/local_modules/web3-providers-http/local_modules/xhr2-cookies/.gitignore
index ec471e4..022ec5d 100644
--- a/local_modules/web3-providers-http/local_modules/xhr2-cookies/.gitignore
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/.gitignore
@@ -1,6 +1,4 @@
 node_modules
 yarn-error.log
 .idea
-**/*.js
-**/*.js.map
 !wallaby.js
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/errors.js b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/errors.js
new file mode 100644
index 0000000..6a27a12
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/errors.js
@@ -0,0 +1,45 @@
+"use strict";
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+Object.defineProperty(exports, "__esModule", { value: true });
+var SecurityError = /** @class */ (function (_super) {
+    __extends(SecurityError, _super);
+    function SecurityError() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    return SecurityError;
+}(Error));
+exports.SecurityError = SecurityError;
+var InvalidStateError = /** @class */ (function (_super) {
+    __extends(InvalidStateError, _super);
+    function InvalidStateError() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    return InvalidStateError;
+}(Error));
+exports.InvalidStateError = InvalidStateError;
+var NetworkError = /** @class */ (function (_super) {
+    __extends(NetworkError, _super);
+    function NetworkError() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    return NetworkError;
+}(Error));
+exports.NetworkError = NetworkError;
+var SyntaxError = /** @class */ (function (_super) {
+    __extends(SyntaxError, _super);
+    function SyntaxError() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    return SyntaxError;
+}(Error));
+exports.SyntaxError = SyntaxError;
+//# sourceMappingURL=errors.js.map
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/errors.js.map b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/errors.js.map
new file mode 100644
index 0000000..b8867f8
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/errors.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"errors.js","sourceRoot":"","sources":["../errors.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA;IAAmC,iCAAK;IAAxC;;IAA0C,CAAC;IAAD,oBAAC;AAAD,CAAC,AAA3C,CAAmC,KAAK,GAAG;AAA9B,sCAAa;AAC1B;IAAuC,qCAAK;IAA5C;;IAA8C,CAAC;IAAD,wBAAC;AAAD,CAAC,AAA/C,CAAuC,KAAK,GAAG;AAAlC,8CAAiB;AAC9B;IAAkC,gCAAK;IAAvC;;IAAyC,CAAC;IAAD,mBAAC;AAAD,CAAC,AAA1C,CAAkC,KAAK,GAAG;AAA7B,oCAAY;AACzB;IAAiC,+BAAK;IAAtC;;IAAwC,CAAC;IAAD,kBAAC;AAAD,CAAC,AAAzC,CAAiC,KAAK,GAAG;AAA5B,kCAAW"}
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/index.js b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/index.js
new file mode 100644
index 0000000..dfadc7c
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/index.js
@@ -0,0 +1,9 @@
+"use strict";
+function __export(m) {
+    for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
+}
+Object.defineProperty(exports, "__esModule", { value: true });
+__export(require("./xml-http-request"));
+var xml_http_request_event_target_1 = require("./xml-http-request-event-target");
+exports.XMLHttpRequestEventTarget = xml_http_request_event_target_1.XMLHttpRequestEventTarget;
+//# sourceMappingURL=index.js.map
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/index.js.map b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/index.js.map
new file mode 100644
index 0000000..f7421cb
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/index.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"index.js","sourceRoot":"","sources":["../index.ts"],"names":[],"mappings":";;;;;AAAA,wCAAmC;AACnC,iFAA4E;AAAnE,oEAAA,yBAAyB,CAAA"}
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/progress-event.js b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/progress-event.js
new file mode 100644
index 0000000..9ed411a
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/progress-event.js
@@ -0,0 +1,15 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var ProgressEvent = /** @class */ (function () {
+    function ProgressEvent(type) {
+        this.type = type;
+        this.bubbles = false;
+        this.cancelable = false;
+        this.loaded = 0;
+        this.lengthComputable = false;
+        this.total = 0;
+    }
+    return ProgressEvent;
+}());
+exports.ProgressEvent = ProgressEvent;
+//# sourceMappingURL=progress-event.js.map
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/progress-event.js.map b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/progress-event.js.map
new file mode 100644
index 0000000..fb763b4
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/progress-event.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"progress-event.js","sourceRoot":"","sources":["../progress-event.ts"],"names":[],"mappings":";;AAEA;IAQC,uBAAoB,IAAY;QAAZ,SAAI,GAAJ,IAAI,CAAQ;QAPhC,YAAO,GAAG,KAAK,CAAC;QAChB,eAAU,GAAG,KAAK,CAAC;QAEnB,WAAM,GAAG,CAAC,CAAC;QACX,qBAAgB,GAAG,KAAK,CAAC;QACzB,UAAK,GAAG,CAAC,CAAC;IAEyB,CAAC;IACrC,oBAAC;AAAD,CAAC,AATD,IASC;AATY,sCAAa"}
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-event-target.js b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-event-target.js
new file mode 100644
index 0000000..d937043
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-event-target.js
@@ -0,0 +1,41 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var XMLHttpRequestEventTarget = /** @class */ (function () {
+    function XMLHttpRequestEventTarget() {
+        this.listeners = {};
+    }
+    XMLHttpRequestEventTarget.prototype.addEventListener = function (eventType, listener) {
+        eventType = eventType.toLowerCase();
+        this.listeners[eventType] = this.listeners[eventType] || [];
+        this.listeners[eventType].push(listener.handleEvent || listener);
+    };
+    XMLHttpRequestEventTarget.prototype.removeEventListener = function (eventType, listener) {
+        eventType = eventType.toLowerCase();
+        if (!this.listeners[eventType]) {
+            return;
+        }
+        var index = this.listeners[eventType].indexOf(listener.handleEvent || listener);
+        if (index < 0) {
+            return;
+        }
+        this.listeners[eventType].splice(index, 1);
+    };
+    XMLHttpRequestEventTarget.prototype.dispatchEvent = function (event) {
+        var eventType = event.type.toLowerCase();
+        event.target = this; // TODO: set event.currentTarget?
+        if (this.listeners[eventType]) {
+            for (var _i = 0, _a = this.listeners[eventType]; _i < _a.length; _i++) {
+                var listener_1 = _a[_i];
+                listener_1.call(this, event);
+            }
+        }
+        var listener = this["on" + eventType];
+        if (listener) {
+            listener.call(this, event);
+        }
+        return true;
+    };
+    return XMLHttpRequestEventTarget;
+}());
+exports.XMLHttpRequestEventTarget = XMLHttpRequestEventTarget;
+//# sourceMappingURL=xml-http-request-event-target.js.map
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-event-target.js.map b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-event-target.js.map
new file mode 100644
index 0000000..371d324
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-event-target.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"xml-http-request-event-target.js","sourceRoot":"","sources":["../xml-http-request-event-target.ts"],"names":[],"mappings":";;AAMA;IAAA;QASS,cAAS,GAAmD,EAAE,CAAC;IAiCxE,CAAC;IA/BA,oDAAgB,GAAhB,UAAiB,SAAiB,EAAE,QAAqD;QACxF,SAAS,GAAG,SAAS,CAAC,WAAW,EAAE,CAAC;QACpC,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,GAAG,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,IAAI,EAAE,CAAC;QAC5D,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,IAAI,CAAE,QAAwC,CAAC,WAAW,IAAK,QAAkC,CAAC,CAAC;IAC9H,CAAC;IACD,uDAAmB,GAAnB,UAAoB,SAAiB,EAAE,QAAqD;QAC3F,SAAS,GAAG,SAAS,CAAC,WAAW,EAAE,CAAC;QACpC,EAAE,CAAC,CAAC,CAAC,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;YAAC,MAAM,CAAC;QAAC,CAAC;QAE3C,IAAM,KAAK,GAAG,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,OAAO,CAAE,QAAwC,CAAC,WAAW,IAAK,QAAkC,CAAC,CAAC;QAC9I,EAAE,CAAC,CAAC,KAAK,GAAG,CAAC,CAAC,CAAC,CAAC;YAAC,MAAM,CAAC;QAAC,CAAC;QAE1B,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,MAAM,CAAC,KAAK,EAAE,CAAC,CAAC,CAAC;IAC5C,CAAC;IACD,iDAAa,GAAb,UAAc,KAAoB;QACjC,IAAM,SAAS,GAAG,KAAK,CAAC,IAAI,CAAC,WAAW,EAAE,CAAC;QAC3C,KAAK,CAAC,MAAM,GAAG,IAAI,CAAC,CAAC,iCAAiC;QAEtD,EAAE,CAAC,CAAC,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;YAC/B,GAAG,CAAC,CAAiB,UAAyB,EAAzB,KAAA,IAAI,CAAC,SAAS,CAAC,SAAS,CAAC,EAAzB,cAAyB,EAAzB,IAAyB;gBAAzC,IAAI,UAAQ,SAAA;gBAChB,UAAQ,CAAC,IAAI,CAAC,IAAI,EAAE,KAAK,CAAC,CAAC;aAC3B;QACF,CAAC;QAED,IAAM,QAAQ,GAAG,IAAI,CAAC,OAAK,SAAW,CAAC,CAAC;QACxC,EAAE,CAAC,CAAC,QAAQ,CAAC,CAAC,CAAC;YACd,QAAQ,CAAC,IAAI,CAAC,IAAI,EAAE,KAAK,CAAC,CAAC;QAC5B,CAAC;QAED,MAAM,CAAC,IAAI,CAAC;IACb,CAAC;IACF,gCAAC;AAAD,CAAC,AA1CD,IA0CC;AA1CY,8DAAyB"}
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-upload.js b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-upload.js
new file mode 100644
index 0000000..ce99c78
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-upload.js
@@ -0,0 +1,78 @@
+"use strict";
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+Object.defineProperty(exports, "__esModule", { value: true });
+var xml_http_request_event_target_1 = require("./xml-http-request-event-target");
+var XMLHttpRequestUpload = /** @class */ (function (_super) {
+    __extends(XMLHttpRequestUpload, _super);
+    function XMLHttpRequestUpload() {
+        var _this = _super.call(this) || this;
+        _this._contentType = null;
+        _this._body = null;
+        _this._reset();
+        return _this;
+    }
+    XMLHttpRequestUpload.prototype._reset = function () {
+        this._contentType = null;
+        this._body = null;
+    };
+    XMLHttpRequestUpload.prototype._setData = function (data) {
+        if (data == null) {
+            return;
+        }
+        if (typeof data === 'string') {
+            if (data.length !== 0) {
+                this._contentType = 'text/plain;charset=UTF-8';
+            }
+            this._body = Buffer.from(data, 'utf-8');
+        }
+        else if (Buffer.isBuffer(data)) {
+            this._body = data;
+        }
+        else if (data instanceof ArrayBuffer) {
+            var body = Buffer.alloc(data.byteLength);
+            var view = new Uint8Array(data);
+            for (var i = 0; i < data.byteLength; i++) {
+                body[i] = view[i];
+            }
+            this._body = body;
+        }
+        else if (data.buffer && data.buffer instanceof ArrayBuffer) {
+            var body = Buffer.alloc(data.byteLength);
+            var offset = data.byteOffset;
+            var view = new Uint8Array(data.buffer);
+            for (var i = 0; i < data.byteLength; i++) {
+                body[i] = view[i + offset];
+            }
+            this._body = body;
+        }
+        else {
+            throw new Error("Unsupported send() data " + data);
+        }
+    };
+    XMLHttpRequestUpload.prototype._finalizeHeaders = function (headers, loweredHeaders) {
+        if (this._contentType && !loweredHeaders['content-type']) {
+            headers['Content-Type'] = this._contentType;
+        }
+        if (this._body) {
+            headers['Content-Length'] = this._body.length.toString();
+        }
+    };
+    XMLHttpRequestUpload.prototype._startUpload = function (request) {
+        if (this._body) {
+            request.write(this._body);
+        }
+        request.end();
+    };
+    return XMLHttpRequestUpload;
+}(xml_http_request_event_target_1.XMLHttpRequestEventTarget));
+exports.XMLHttpRequestUpload = XMLHttpRequestUpload;
+//# sourceMappingURL=xml-http-request-upload.js.map
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-upload.js.map b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-upload.js.map
new file mode 100644
index 0000000..8f6f72d
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request-upload.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"xml-http-request-upload.js","sourceRoot":"","sources":["../xml-http-request-upload.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA,iFAA4E;AAG5E;IAA0C,wCAAyB;IAIlE;QAAA,YACC,iBAAO,SAEP;QANO,kBAAY,GAAkB,IAAI,CAAC;QACnC,WAAK,GAAG,IAAI,CAAC;QAIpB,KAAI,CAAC,MAAM,EAAE,CAAC;;IACf,CAAC;IAED,qCAAM,GAAN;QACC,IAAI,CAAC,YAAY,GAAG,IAAI,CAAC;QACzB,IAAI,CAAC,KAAK,GAAG,IAAI,CAAC;IACnB,CAAC;IAED,uCAAQ,GAAR,UAAS,IAAsD;QAC9D,EAAE,CAAC,CAAC,IAAI,IAAI,IAAI,CAAC,CAAC,CAAC;YAAC,MAAM,CAAC;QAAC,CAAC;QAE7B,EAAE,CAAC,CAAC,OAAO,IAAI,KAAK,QAAQ,CAAC,CAAC,CAAC;YAC9B,EAAE,CAAC,CAAC,IAAI,CAAC,MAAM,KAAK,CAAC,CAAC,CAAC,CAAC;gBACvB,IAAI,CAAC,YAAY,GAAG,0BAA0B,CAAC;YAChD,CAAC;YACD,IAAI,CAAC,KAAK,GAAG,MAAM,CAAC,IAAI,CAAC,IAAI,EAAE,OAAO,CAAC,CAAC;QACzC,CAAC;QAAC,IAAI,CAAC,EAAE,CAAC,CAAC,MAAM,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;YAClC,IAAI,CAAC,KAAK,GAAG,IAAI,CAAC;QACnB,CAAC;QAAC,IAAI,CAAC,EAAE,CAAC,CAAC,IAAI,YAAY,WAAW,CAAC,CAAC,CAAC;YACxC,IAAM,IAAI,GAAG,MAAM,CAAC,KAAK,CAAC,IAAI,CAAC,UAAU,CAAC,CAAC;YAC3C,IAAM,IAAI,GAAG,IAAI,UAAU,CAAC,IAAI,CAAC,CAAC;YAClC,GAAG,CAAC,CAAC,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,UAAU,EAAE,CAAC,EAAE,EAAE,CAAC;gBAAC,IAAI,CAAC,CAAC,CAAC,GAAG,IAAI,CAAC,CAAC,CAAC,CAAC;YAAC,CAAC;YAChE,IAAI,CAAC,KAAK,GAAG,IAAI,CAAC;QACnB,CAAC;QAAC,IAAI,CAAC,EAAE,CAAC,CAAC,IAAI,CAAC,MAAM,IAAI,IAAI,CAAC,MAAM,YAAY,WAAW,CAAC,CAAC,CAAC;YAC9D,IAAM,IAAI,GAAG,MAAM,CAAC,KAAK,CAAC,IAAI,CAAC,UAAU,CAAC,CAAC;YAC3C,IAAM,MAAM,GAAG,IAAI,CAAC,UAAU,CAAC;YAC/B,IAAM,IAAI,GAAG,IAAI,UAAU,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC;YACzC,GAAG,CAAC,CAAC,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,UAAU,EAAE,CAAC,EAAE,EAAE,CAAC;gBAAC,IAAI,CAAC,CAAC,CAAC,GAAG,IAAI,CAAC,CAAC,GAAG,MAAM,CAAC,CAAC;YAAC,CAAC;YACzE,IAAI,CAAC,KAAK,GAAG,IAAI,CAAC;QACnB,CAAC;QAAC,IAAI,CAAC,CAAC;YACP,MAAM,IAAI,KAAK,CAAC,6BAA2B,IAAM,CAAC,CAAC;QACpD,CAAC;IACF,CAAC;IAED,+CAAgB,GAAhB,UAAiB,OAAe,EAAE,cAAsB;QACvD,EAAE,CAAC,CAAC,IAAI,CAAC,YAAY,IAAI,CAAC,cAAc,CAAC,cAAc,CAAC,CAAC,CAAC,CAAC;YAC1D,OAAO,CAAC,cAAc,CAAC,GAAG,IAAI,CAAC,YAAY,CAAC;QAC7C,CAAC;QACD,EAAE,CAAC,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC,CAAC;YAChB,OAAO,CAAC,gBAAgB,CAAC,GAAG,IAAI,CAAC,KAAK,CAAC,MAAM,CAAC,QAAQ,EAAE,CAAC;QAC1D,CAAC;IACF,CAAC;IAED,2CAAY,GAAZ,UAAa,OAAsB;QAClC,EAAE,CAAC,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC,CAAC;YAAC,OAAO,CAAC,KAAK,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC;QAAC,CAAC;QAC9C,OAAO,CAAC,GAAG,EAAE,CAAC;IACf,CAAC;IACF,2BAAC;AAAD,CAAC,AArDD,CAA0C,yDAAyB,GAqDlE;AArDY,oDAAoB"}
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request.js b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request.js
new file mode 100644
index 0000000..8872863
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request.js
@@ -0,0 +1,448 @@
+"use strict";
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+var http = require("http");
+var https = require("https");
+var url = require("url");
+var progress_event_1 = require("./progress-event");
+var errors_1 = require("./errors");
+var xml_http_request_event_target_1 = require("./xml-http-request-event-target");
+var xml_http_request_upload_1 = require("./xml-http-request-upload");
+var Cookie = require("cookiejar");
+var XMLHttpRequest = /** @class */ (function (_super) {
+    __extends(XMLHttpRequest, _super);
+    function XMLHttpRequest(options) {
+        if (options === void 0) { options = {}; }
+        var _this = _super.call(this) || this;
+        _this.UNSENT = XMLHttpRequest.UNSENT;
+        _this.OPENED = XMLHttpRequest.OPENED;
+        _this.HEADERS_RECEIVED = XMLHttpRequest.HEADERS_RECEIVED;
+        _this.LOADING = XMLHttpRequest.LOADING;
+        _this.DONE = XMLHttpRequest.DONE;
+        _this.onreadystatechange = null;
+        _this.readyState = XMLHttpRequest.UNSENT;
+        _this.response = null;
+        _this.responseText = '';
+        _this.responseType = '';
+        _this.status = 0; // TODO: UNSENT?
+        _this.statusText = '';
+        _this.timeout = 0;
+        _this.upload = new xml_http_request_upload_1.XMLHttpRequestUpload();
+        _this.responseUrl = '';
+        _this.withCredentials = false;
+        _this._method = null;
+        _this._url = null;
+        _this._sync = false;
+        _this._headers = {};
+        _this._loweredHeaders = {};
+        _this._mimeOverride = null; // TODO: is type right?
+        _this._request = null;
+        _this._response = null;
+        _this._responseParts = null;
+        _this._responseHeaders = null;
+        _this._aborting = null; // TODO: type?
+        _this._error = null; // TODO: type?
+        _this._loadedBytes = 0;
+        _this._totalBytes = 0;
+        _this._lengthComputable = false;
+        _this._restrictedMethods = { CONNECT: true, TRACE: true, TRACK: true };
+        _this._restrictedHeaders = {
+            'accept-charset': true,
+            'accept-encoding': true,
+            'access-control-request-headers': true,
+            'access-control-request-method': true,
+            connection: true,
+            'content-length': true,
+            cookie: true,
+            cookie2: true,
+            date: true,
+            dnt: true,
+            expect: true,
+            host: true,
+            'keep-alive': true,
+            origin: true,
+            referer: true,
+            te: true,
+            trailer: true,
+            'transfer-encoding': true,
+            upgrade: true,
+            'user-agent': true,
+            via: true
+        };
+        _this._privateHeaders = { 'set-cookie': true, 'set-cookie2': true };
+        //Redacted private information (${os.type()} ${os.arch()}) node.js/${process.versions.node} v8/${process.versions.v8} from the original version @ github
+        //Pretend to be tor-browser https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-ahead/
+        _this._userAgent = "Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0";
+        _this._anonymous = options.anon || false;
+        return _this;
+    }
+    XMLHttpRequest.prototype.open = function (method, url, async, user, password) {
+        if (async === void 0) { async = true; }
+        method = method.toUpperCase();
+        if (this._restrictedMethods[method]) {
+            throw new XMLHttpRequest.SecurityError("HTTP method " + method + " is not allowed in XHR");
+        }
+        ;
+        var xhrUrl = this._parseUrl(url, user, password);
+        if (this.readyState === XMLHttpRequest.HEADERS_RECEIVED || this.readyState === XMLHttpRequest.LOADING) {
+            // TODO(pwnall): terminate abort(), terminate send()
+        }
+        this._method = method;
+        this._url = xhrUrl;
+        this._sync = !async;
+        this._headers = {};
+        this._loweredHeaders = {};
+        this._mimeOverride = null;
+        this._setReadyState(XMLHttpRequest.OPENED);
+        this._request = null;
+        this._response = null;
+        this.status = 0;
+        this.statusText = '';
+        this._responseParts = [];
+        this._responseHeaders = null;
+        this._loadedBytes = 0;
+        this._totalBytes = 0;
+        this._lengthComputable = false;
+    };
+    XMLHttpRequest.prototype.setRequestHeader = function (name, value) {
+        if (this.readyState !== XMLHttpRequest.OPENED) {
+            throw new XMLHttpRequest.InvalidStateError('XHR readyState must be OPENED');
+        }
+        var loweredName = name.toLowerCase();
+        if (this._restrictedHeaders[loweredName] || /^sec-/.test(loweredName) || /^proxy-/.test(loweredName)) {
+            console.warn("Refused to set unsafe header \"" + name + "\"");
+            return;
+        }
+        value = value.toString();
+        if (this._loweredHeaders[loweredName] != null) {
+            name = this._loweredHeaders[loweredName];
+            this._headers[name] = this._headers[name] + ", " + value;
+        }
+        else {
+            this._loweredHeaders[loweredName] = name;
+            this._headers[name] = value;
+        }
+    };
+    XMLHttpRequest.prototype.send = function (data) {
+        if (this.readyState !== XMLHttpRequest.OPENED) {
+            throw new XMLHttpRequest.InvalidStateError('XHR readyState must be OPENED');
+        }
+        if (this._request) {
+            throw new XMLHttpRequest.InvalidStateError('send() already called');
+        }
+        switch (this._url.protocol) {
+            case 'file:':
+                return this._sendFile(data);
+            case 'http:':
+            case 'https:':
+                return this._sendHttp(data);
+            default:
+                throw new XMLHttpRequest.NetworkError("Unsupported protocol " + this._url.protocol);
+        }
+    };
+    XMLHttpRequest.prototype.abort = function () {
+        if (this._request == null) {
+            return;
+        }
+        this._request.abort();
+        this._setError();
+        this._dispatchProgress('abort');
+        this._dispatchProgress('loadend');
+    };
+    XMLHttpRequest.prototype.getResponseHeader = function (name) {
+        if (this._responseHeaders == null || name == null) {
+            return null;
+        }
+        var loweredName = name.toLowerCase();
+        return this._responseHeaders.hasOwnProperty(loweredName)
+            ? this._responseHeaders[name.toLowerCase()]
+            : null;
+    };
+    XMLHttpRequest.prototype.getAllResponseHeaders = function () {
+        var _this = this;
+        if (this._responseHeaders == null) {
+            return '';
+        }
+        return Object.keys(this._responseHeaders).map(function (key) { return key + ": " + _this._responseHeaders[key]; }).join('\r\n');
+    };
+    XMLHttpRequest.prototype.overrideMimeType = function (mimeType) {
+        if (this.readyState === XMLHttpRequest.LOADING || this.readyState === XMLHttpRequest.DONE) {
+            throw new XMLHttpRequest.InvalidStateError('overrideMimeType() not allowed in LOADING or DONE');
+        }
+        this._mimeOverride = mimeType.toLowerCase();
+    };
+    XMLHttpRequest.prototype.nodejsSet = function (options) {
+        this.nodejsHttpAgent = options.httpAgent || this.nodejsHttpAgent;
+        this.nodejsHttpsAgent = options.httpsAgent || this.nodejsHttpsAgent;
+        if (options.hasOwnProperty('baseUrl')) {
+            if (options.baseUrl != null) {
+                var parsedUrl = url.parse(options.baseUrl, false, true);
+                if (!parsedUrl.protocol) {
+                    throw new XMLHttpRequest.SyntaxError("baseUrl must be an absolute URL");
+                }
+            }
+            this.nodejsBaseUrl = options.baseUrl;
+        }
+    };
+    XMLHttpRequest.nodejsSet = function (options) {
+        XMLHttpRequest.prototype.nodejsSet(options);
+    };
+    XMLHttpRequest.prototype._setReadyState = function (readyState) {
+        this.readyState = readyState;
+        this.dispatchEvent(new progress_event_1.ProgressEvent('readystatechange'));
+    };
+    XMLHttpRequest.prototype._sendFile = function (data) {
+        // TODO
+        throw new Error('Protocol file: not implemented');
+    };
+    XMLHttpRequest.prototype._sendHttp = function (data) {
+        if (this._sync) {
+            throw new Error('Synchronous XHR processing not implemented');
+        }
+        if (data && (this._method === 'GET' || this._method === 'HEAD')) {
+            console.warn("Discarding entity body for " + this._method + " requests");
+            data = null;
+        }
+        else {
+            data = data || '';
+        }
+        this.upload._setData(data);
+        this._finalizeHeaders();
+        this._sendHxxpRequest();
+    };
+    XMLHttpRequest.prototype._sendHxxpRequest = function () {
+        var _this = this;
+        if (this.withCredentials) {
+            var cookie = XMLHttpRequest.cookieJar
+                .getCookies(Cookie.CookieAccessInfo(this._url.hostname, this._url.pathname, this._url.protocol === 'https:')).toValueString();
+            this._headers.cookie = this._headers.cookie2 = cookie;
+        }
+        var _a = this._url.protocol === 'http:' ? [http, this.nodejsHttpAgent] : [https, this.nodejsHttpsAgent], hxxp = _a[0], agent = _a[1];
+        var requestMethod = hxxp.request.bind(hxxp);
+        var request = requestMethod({
+            hostname: this._url.hostname,
+            port: +this._url.port,
+            path: this._url.path,
+            auth: this._url.auth,
+            method: this._method,
+            headers: this._headers,
+            agent: agent
+        });
+        this._request = request;
+        if (this.timeout) {
+            request.setTimeout(this.timeout, function () { return _this._onHttpTimeout(request); });
+        }
+        request.on('response', function (response) { return _this._onHttpResponse(request, response); });
+        request.on('error', function (error) { return _this._onHttpRequestError(request, error); });
+        this.upload._startUpload(request);
+        if (this._request === request) {
+            this._dispatchProgress('loadstart');
+        }
+    };
+    XMLHttpRequest.prototype._finalizeHeaders = function () {
+        this._headers = __assign({}, this._headers, { Connection: 'keep-alive', Host: this._url.host, 'User-Agent': this._userAgent }, this._anonymous ? { Referer: 'about:blank' } : {});
+        this.upload._finalizeHeaders(this._headers, this._loweredHeaders);
+    };
+    XMLHttpRequest.prototype._onHttpResponse = function (request, response) {
+        var _this = this;
+        if (this._request !== request) {
+            return;
+        }
+        if (this.withCredentials && (response.headers['set-cookie'] || response.headers['set-cookie2'])) {
+            XMLHttpRequest.cookieJar
+                .setCookies(response.headers['set-cookie'] || response.headers['set-cookie2']);
+        }
+        if ([301, 302, 303, 307, 308].indexOf(response.statusCode) >= 0) {
+            this._url = this._parseUrl(response.headers.location);
+            this._method = 'GET';
+            if (this._loweredHeaders['content-type']) {
+                delete this._headers[this._loweredHeaders['content-type']];
+                delete this._loweredHeaders['content-type'];
+            }
+            if (this._headers['Content-Type'] != null) {
+                delete this._headers['Content-Type'];
+            }
+            delete this._headers['Content-Length'];
+            this.upload._reset();
+            this._finalizeHeaders();
+            this._sendHxxpRequest();
+            return;
+        }
+        this._response = response;
+        this._response.on('data', function (data) { return _this._onHttpResponseData(response, data); });
+        this._response.on('end', function () { return _this._onHttpResponseEnd(response); });
+        this._response.on('close', function () { return _this._onHttpResponseClose(response); });
+        this.responseUrl = this._url.href.split('#')[0];
+        this.status = response.statusCode;
+        this.statusText = http.STATUS_CODES[this.status];
+        this._parseResponseHeaders(response);
+        var lengthString = this._responseHeaders['content-length'] || '';
+        this._totalBytes = +lengthString;
+        this._lengthComputable = !!lengthString;
+        this._setReadyState(XMLHttpRequest.HEADERS_RECEIVED);
+    };
+    XMLHttpRequest.prototype._onHttpResponseData = function (response, data) {
+        if (this._response !== response) {
+            return;
+        }
+        this._responseParts.push(Buffer.from(data));
+        this._loadedBytes += data.length;
+        if (this.readyState !== XMLHttpRequest.LOADING) {
+            this._setReadyState(XMLHttpRequest.LOADING);
+        }
+        this._dispatchProgress('progress');
+    };
+    XMLHttpRequest.prototype._onHttpResponseEnd = function (response) {
+        if (this._response !== response) {
+            return;
+        }
+        this._parseResponse();
+        this._request = null;
+        this._response = null;
+        this._setReadyState(XMLHttpRequest.DONE);
+        this._dispatchProgress('load');
+        this._dispatchProgress('loadend');
+    };
+    XMLHttpRequest.prototype._onHttpResponseClose = function (response) {
+        if (this._response !== response) {
+            return;
+        }
+        var request = this._request;
+        this._setError();
+        request.abort();
+        this._setReadyState(XMLHttpRequest.DONE);
+        this._dispatchProgress('error');
+        this._dispatchProgress('loadend');
+    };
+    XMLHttpRequest.prototype._onHttpTimeout = function (request) {
+        if (this._request !== request) {
+            return;
+        }
+        this._setError();
+        request.abort();
+        this._setReadyState(XMLHttpRequest.DONE);
+        this._dispatchProgress('timeout');
+        this._dispatchProgress('loadend');
+    };
+    XMLHttpRequest.prototype._onHttpRequestError = function (request, error) {
+        if (this._request !== request) {
+            return;
+        }
+        this._setError();
+        request.abort();
+        this._setReadyState(XMLHttpRequest.DONE);
+        this._dispatchProgress('error');
+        this._dispatchProgress('loadend');
+    };
+    XMLHttpRequest.prototype._dispatchProgress = function (eventType) {
+        var event = new XMLHttpRequest.ProgressEvent(eventType);
+        event.lengthComputable = this._lengthComputable;
+        event.loaded = this._loadedBytes;
+        event.total = this._totalBytes;
+        this.dispatchEvent(event);
+    };
+    XMLHttpRequest.prototype._setError = function () {
+        this._request = null;
+        this._response = null;
+        this._responseHeaders = null;
+        this._responseParts = null;
+    };
+    XMLHttpRequest.prototype._parseUrl = function (urlString, user, password) {
+        var absoluteUrl = this.nodejsBaseUrl == null ? urlString : url.resolve(this.nodejsBaseUrl, urlString);
+        var xhrUrl = url.parse(absoluteUrl, false, true);
+        xhrUrl.hash = null;
+        var _a = (xhrUrl.auth || '').split(':'), xhrUser = _a[0], xhrPassword = _a[1];
+        if (xhrUser || xhrPassword || user || password) {
+            xhrUrl.auth = (user || xhrUser || '') + ":" + (password || xhrPassword || '');
+        }
+        return xhrUrl;
+    };
+    XMLHttpRequest.prototype._parseResponseHeaders = function (response) {
+        this._responseHeaders = {};
+        for (var name_1 in response.headers) {
+            var loweredName = name_1.toLowerCase();
+            if (this._privateHeaders[loweredName]) {
+                continue;
+            }
+            this._responseHeaders[loweredName] = response.headers[name_1];
+        }
+        if (this._mimeOverride != null) {
+            this._responseHeaders['content-type'] = this._mimeOverride;
+        }
+    };
+    XMLHttpRequest.prototype._parseResponse = function () {
+        var buffer = Buffer.concat(this._responseParts);
+        this._responseParts = null;
+        switch (this.responseType) {
+            case 'json':
+                this.responseText = null;
+                try {
+                    this.response = JSON.parse(buffer.toString('utf-8'));
+                }
+                catch (_a) {
+                    this.response = null;
+                }
+                return;
+            case 'buffer':
+                this.responseText = null;
+                this.response = buffer;
+                return;
+            case 'arraybuffer':
+                this.responseText = null;
+                var arrayBuffer = new ArrayBuffer(buffer.length);
+                var view = new Uint8Array(arrayBuffer);
+                for (var i = 0; i < buffer.length; i++) {
+                    view[i] = buffer[i];
+                }
+                this.response = arrayBuffer;
+                return;
+            case 'text':
+            default:
+                try {
+                    this.responseText = buffer.toString(this._parseResponseEncoding());
+                }
+                catch (_b) {
+                    this.responseText = buffer.toString('binary');
+                }
+                this.response = this.responseText;
+        }
+    };
+    XMLHttpRequest.prototype._parseResponseEncoding = function () {
+        return /;\s*charset=(.*)$/.exec(this._responseHeaders['content-type'] || '')[1] || 'utf-8';
+    };
+    XMLHttpRequest.ProgressEvent = progress_event_1.ProgressEvent;
+    XMLHttpRequest.InvalidStateError = errors_1.InvalidStateError;
+    XMLHttpRequest.NetworkError = errors_1.NetworkError;
+    XMLHttpRequest.SecurityError = errors_1.SecurityError;
+    XMLHttpRequest.SyntaxError = errors_1.SyntaxError;
+    XMLHttpRequest.XMLHttpRequestUpload = xml_http_request_upload_1.XMLHttpRequestUpload;
+    XMLHttpRequest.UNSENT = 0;
+    XMLHttpRequest.OPENED = 1;
+    XMLHttpRequest.HEADERS_RECEIVED = 2;
+    XMLHttpRequest.LOADING = 3;
+    XMLHttpRequest.DONE = 4;
+    XMLHttpRequest.cookieJar = Cookie.CookieJar();
+    return XMLHttpRequest;
+}(xml_http_request_event_target_1.XMLHttpRequestEventTarget));
+exports.XMLHttpRequest = XMLHttpRequest;
+XMLHttpRequest.prototype.nodejsHttpAgent = http.globalAgent;
+XMLHttpRequest.prototype.nodejsHttpsAgent = https.globalAgent;
+XMLHttpRequest.prototype.nodejsBaseUrl = null;
+//# sourceMappingURL=xml-http-request.js.map
\ No newline at end of file
diff --git a/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request.js.map b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request.js.map
new file mode 100644
index 0000000..3b63559
--- /dev/null
+++ b/local_modules/web3-providers-http/local_modules/xhr2-cookies/dist/xml-http-request.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/local_modules/web3-providers-http/package.json b/local_modules/web3-providers-http/package.json
index 5aa87ff..dac04ae 100644
--- a/local_modules/web3-providers-http/package.json
+++ b/local_modules/web3-providers-http/package.json
@@ -15,7 +15,7 @@
     "main": "lib/index.js",
     "dependencies": {
         "web3-core-helpers": "1.6.1",
-        "xhr2-cookies": "file:./local_modules/xhr2-cookies"
+        "xhr2-cookies": "file:local_modules/xhr2-cookies"
     },
     "devDependencies": {
         "dtslint": "^3.4.1",
diff --git a/local_modules/web3-providers-http/tsconfig.json b/local_modules/web3-providers-http/tsconfig.json
index 06cc6c1..4c3deb7 100644
--- a/local_modules/web3-providers-http/tsconfig.json
+++ b/local_modules/web3-providers-http/tsconfig.json
@@ -6,4 +6,4 @@
     "include": [
       "./src"
     ]
-   }
\ No newline at end of file
+   }
diff --git a/package-lock.json b/package-lock.json
index a342406..8788f83 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2580,6 +2580,28 @@
         "locate-path": "^3.0.0"
       }
     },
+    "fixed-merkle-tree": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/fixed-merkle-tree/-/fixed-merkle-tree-0.6.1.tgz",
+      "integrity": "sha512-cYwK8ZJRC/qlRwB6f1WDbqDi3SLSraFr9LQp948U3LmHZpF0VnuB0QOsLhMVwOpR1eJ178oiqz0JcwaupRU9kA==",
+      "requires": {
+        "circomlib": "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c",
+        "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5"
+      },
+      "dependencies": {
+        "circomlib": {
+          "version": "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c",
+          "from": "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c",
+          "requires": {
+            "blake-hash": "^1.1.0",
+            "blake2b": "^2.1.3",
+            "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
+            "typedarray-to-buffer": "^3.1.5",
+            "web3": "^1.2.11"
+          }
+        }
+      }
+    },
     "flat-cache": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz",
diff --git a/package.json b/package.json
index ae1b588..590051a 100644
--- a/package.json
+++ b/package.json
@@ -10,16 +10,17 @@
   "license": "ISC",
   "dependencies": {
     "axios": "^0.19.2",
-    "bignumber.js": "9.0.0",
+    "bignumber.js": "^9.0.0",
     "circom": "0.0.35",
     "circomlib": "git+https://github.com/tornadocash/circomlib.git#3b492f9801573eebcfe1b6c584afe8a3beecf2b4",
     "commander": "^5.1.0",
     "dotenv": "^8.2.0",
+    "fixed-merkle-tree": "^0.6.1",
     "gas-price-oracle": "^0.4.4",
     "socks-proxy-agent": "^6.1.1",
     "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
     "web3": "^1.6.1",
-    "web3-providers-http": "file:./local_modules/web3-providers-http",
+    "web3-providers-http": "file:local_modules/web3-providers-http",
     "websnark": "git+https://github.com/tornadocash/websnark.git#4c0af6a8b65aabea3c09f377f63c44e7a58afa6d"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index a8ead56..5f19cd1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -800,6 +800,16 @@ circom@0.0.35:
     typedarray-to-buffer "^3.1.5"
     web3 "^1.2.11"
 
+"circomlib@git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c":
+  version "0.0.20"
+  resolved "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c"
+  dependencies:
+    blake-hash "^1.1.0"
+    blake2b "^2.1.3"
+    snarkjs "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5"
+    typedarray-to-buffer "^3.1.5"
+    web3 "^1.2.11"
+
 class-is@^1.1.0:
   version "1.1.0"
   resolved "https://registry.npmjs.org/class-is/-/class-is-1.1.0.tgz#9d3c0fba0440d211d843cec3dedfa48055005825"
@@ -1711,6 +1721,14 @@ find-up@^3.0.0:
   dependencies:
     locate-path "^3.0.0"
 
+fixed-merkle-tree@^0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/fixed-merkle-tree/-/fixed-merkle-tree-0.6.1.tgz#ff64bf0beb5d862e73d6c643950926b05b440926"
+  integrity sha512-cYwK8ZJRC/qlRwB6f1WDbqDi3SLSraFr9LQp948U3LmHZpF0VnuB0QOsLhMVwOpR1eJ178oiqz0JcwaupRU9kA==
+  dependencies:
+    circomlib "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c"
+    snarkjs "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5"
+
 flat-cache@^2.0.1:
   version "2.0.1"
   resolved "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz#5d296d6f04bda44a4630a301413bdbc2ec085ec0"
@@ -4180,11 +4198,11 @@ web3-providers-http@1.6.1:
     web3-core-helpers "1.6.1"
     xhr2-cookies "1.1.0"
 
-"web3-providers-http@file:./local_modules/web3-providers-http":
+"web3-providers-http@file:local_modules/web3-providers-http":
   version "1.6.1"
   dependencies:
     web3-core-helpers "1.6.1"
-    xhr2-cookies "file:./../../AppData/Local/Yarn/Cache/v6/npm-web3-providers-http-1.6.1-6879cf8b-ee02-483d-9a46-76314494b334-1638895560210/node_modules/web3-providers-http/local_modules/xhr2-cookies"
+    xhr2-cookies "file:local_modules/web3-providers-http/local_modules/xhr2-cookies"
 
 web3-providers-ipc@1.3.1:
   version "1.3.1"
@@ -4411,7 +4429,7 @@ xhr2-cookies@1.1.0:
   dependencies:
     cookiejar "^2.1.1"
 
-"xhr2-cookies@file:./local_modules/web3-providers-http/local_modules/xhr2-cookies":
+"xhr2-cookies@file:local_modules/web3-providers-http/local_modules/xhr2-cookies":
   version "1.1.0"
   dependencies:
     cookiejar "^2.1.1"