diff --git a/package-lock.json b/package-lock.json
index 6a07b55..53890f0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
-  "name": "merkle-tree",
-  "version": "1.0.0",
+  "name": "fixed-merkle-tree",
+  "version": "0.3.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -68,9 +68,9 @@
       }
     },
     "@babel/parser": {
-      "version": "7.11.0",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.11.0.tgz",
-      "integrity": "sha512-qvRvi4oI8xii8NllyEc4MDJjuZiNaRzyb7Y7lup1NqJV8TZHF4O27CcP+72WPn/k1zkgJ6WJfnIbk4jTsVAZHw==",
+      "version": "7.11.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.11.3.tgz",
+      "integrity": "sha512-REo8xv7+sDxkKvoxEywIdsNFiZLybwdI7hcT5uEPyQrSMB4YQ973BfC9OOrD/81MaIjh6UxdulIQXkjmiH3PcA==",
       "dev": true
     },
     "@babel/template": {
@@ -99,14 +99,6 @@
         "debug": "^4.1.0",
         "globals": "^11.1.0",
         "lodash": "^4.17.19"
-      },
-      "dependencies": {
-        "globals": {
-          "version": "11.12.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
-          "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==",
-          "dev": true
-        }
       }
     },
     "@babel/types": {
@@ -289,9 +281,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "12.12.53",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.53.tgz",
-      "integrity": "sha512-51MYTDTyCziHb70wtGNFRwB4l+5JNvdqzFSkbDvpbftEgVUBEE+T5f7pROhWMp/fxp07oNIEQZd5bbfAH22ohQ=="
+      "version": "12.12.54",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.54.tgz",
+      "integrity": "sha512-ge4xZ3vSBornVYlDnk7yZ0gK6ChHf/CHB7Gl1I0Jhah8DDnEQqBzgohYG4FX4p81TNirSETOiSyn+y1r9/IR6w=="
     },
     "@types/pbkdf2": {
       "version": "3.1.0",
@@ -319,10 +311,9 @@
       }
     },
     "acorn": {
-      "version": "7.3.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
-      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
-      "dev": true
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA=="
     },
     "acorn-jsx": {
       "version": "5.2.0",
@@ -330,9 +321,9 @@
       "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ=="
     },
     "ajv": {
-      "version": "6.12.3",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
-      "integrity": "sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==",
+      "version": "6.12.4",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.4.tgz",
+      "integrity": "sha512-eienB2c9qVQs2KWexhkrdMLVDoIQCz5KSeLxwg9Lzk4DOfBtIK9PQwwufcsn1jjGuf9WZmqPMbGxOzfcuphJCQ==",
       "requires": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -448,9 +439,9 @@
       "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
     },
     "aws4": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.10.0.tgz",
-      "integrity": "sha512-3YDiu347mtVtjpyV3u5kVqQLP242c06zwDOgpeRnybmXlYYsLbtTrUBUm8i8srONt+FWobl5aibnU1030PeeuA=="
+      "version": "1.10.1",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.10.1.tgz",
+      "integrity": "sha512-zg7Hz2k5lI8kb7U32998pRRFin7zJlkfezGJjUc2heaD4Pw2wObakCDVzkKztTm/Ln7eiVvYsjqak0Ed4LkMDA=="
     },
     "babel-eslint": {
       "version": "10.1.0",
@@ -663,15 +654,15 @@
       }
     },
     "browserify-sign": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.0.tgz",
-      "integrity": "sha512-hEZC1KEeYuoHRqhGhTy6gWrpJA3ZDjFWv0DE61643ZnOXAKJb3u7yWcrU0mMc9SwAqK1n7myPGndkp0dFG7NFA==",
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.1.tgz",
+      "integrity": "sha512-/vrA5fguVAKKAVTNJjgSm1tRQDHUU6DbwO9IROu/0WAzC8PKhucDSh18J0RMvVeHAn5puMd+QHC2erPRNf8lmg==",
       "requires": {
         "bn.js": "^5.1.1",
         "browserify-rsa": "^4.0.1",
         "create-hash": "^1.2.0",
         "create-hmac": "^1.1.7",
-        "elliptic": "^6.5.2",
+        "elliptic": "^6.5.3",
         "inherits": "^2.0.4",
         "parse-asn1": "^5.1.5",
         "readable-stream": "^3.6.0",
@@ -679,9 +670,9 @@
       },
       "dependencies": {
         "bn.js": {
-          "version": "5.1.2",
-          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.2.tgz",
-          "integrity": "sha512-40rZaf3bUNKTVYu9sIeeEGOg7g14Yvnj9kH7b50EiwX0Q7A6umbvfI5tvHaOERH0XigqKkfLkFQxzb4e6CIXnA=="
+          "version": "5.1.3",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.3.tgz",
+          "integrity": "sha512-GkTiFpjFtUzU9CbMeJ5iazkCzGL3jrhzerzZIuqLABjbwRaFt33I9tUdSNryIptM+RxDet6OKm2WnLXzW51KsQ=="
         }
       }
     },
@@ -858,85 +849,59 @@
       }
     },
     "circomlib": {
-      "version": "git+https://github.com/tornadocash/circomlib.git#c372f14d324d57339c88451834bf2824e73bbdbc",
-      "from": "git+https://github.com/tornadocash/circomlib.git#c372f14d324d57339c88451834bf2824e73bbdbc",
+      "version": "git+https://github.com/tornadocash/circomlib.git#6282474dc03e47a7cba1486e6ac8df08842314c3",
+      "from": "git+https://github.com/tornadocash/circomlib.git#6282474dc03e47a7cba1486e6ac8df08842314c3",
       "requires": {
         "blake-hash": "^1.1.0",
         "blake2b": "^2.1.3",
         "snarkjs": "git+https://github.com/peppersec/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
         "typedarray-to-buffer": "^3.1.5",
-        "web3": "^1.0.0-beta.55"
+        "web3": "^1.2.11"
       },
       "dependencies": {
-        "acorn": {
-          "version": "6.4.1",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
-          "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA=="
-        },
-        "eslint-scope": {
-          "version": "4.0.3",
-          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
-          "integrity": "sha512-p7VutNr1O/QrxysMo3E45FjYDTeXBy0iTltPFNSqKAIfjDSXC+4dj+qfyuD8bfAXrW/y6lW3O76VaYNPKfpKrg==",
+        "eslint": {
+          "version": "5.16.0",
+          "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
+          "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
           "requires": {
-            "esrecurse": "^4.1.0",
-            "estraverse": "^4.1.1"
+            "@babel/code-frame": "^7.0.0",
+            "ajv": "^6.9.1",
+            "chalk": "^2.1.0",
+            "cross-spawn": "^6.0.5",
+            "debug": "^4.0.1",
+            "doctrine": "^3.0.0",
+            "eslint-scope": "^4.0.3",
+            "eslint-utils": "^1.3.1",
+            "eslint-visitor-keys": "^1.0.0",
+            "espree": "^5.0.1",
+            "esquery": "^1.0.1",
+            "esutils": "^2.0.2",
+            "file-entry-cache": "^5.0.1",
+            "functional-red-black-tree": "^1.0.1",
+            "glob": "^7.1.2",
+            "globals": "^11.7.0",
+            "ignore": "^4.0.6",
+            "import-fresh": "^3.0.0",
+            "imurmurhash": "^0.1.4",
+            "inquirer": "^6.2.2",
+            "js-yaml": "^3.13.0",
+            "json-stable-stringify-without-jsonify": "^1.0.1",
+            "levn": "^0.3.0",
+            "lodash": "^4.17.11",
+            "minimatch": "^3.0.4",
+            "mkdirp": "^0.5.1",
+            "natural-compare": "^1.4.0",
+            "optionator": "^0.8.2",
+            "path-is-inside": "^1.0.2",
+            "progress": "^2.0.0",
+            "regexpp": "^2.0.1",
+            "semver": "^5.5.1",
+            "strip-ansi": "^4.0.0",
+            "strip-json-comments": "^2.0.1",
+            "table": "^5.2.3",
+            "text-table": "^0.2.0"
           }
         },
-        "eslint-utils": {
-          "version": "1.4.3",
-          "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.3.tgz",
-          "integrity": "sha512-fbBN5W2xdY45KulGXmLHZ3c3FHfVYmKg0IrAKGOkT/464PQsx2UeIzfz1RmEci+KLm1bBaAzZAh8+/E+XAeZ8Q==",
-          "requires": {
-            "eslint-visitor-keys": "^1.1.0"
-          }
-        },
-        "espree": {
-          "version": "5.0.1",
-          "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
-          "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
-          "requires": {
-            "acorn": "^6.0.7",
-            "acorn-jsx": "^5.0.0",
-            "eslint-visitor-keys": "^1.0.0"
-          }
-        },
-        "globals": {
-          "version": "11.12.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
-          "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA=="
-        },
-        "levn": {
-          "version": "0.3.0",
-          "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
-          "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
-          "requires": {
-            "prelude-ls": "~1.1.2",
-            "type-check": "~0.3.2"
-          }
-        },
-        "optionator": {
-          "version": "0.8.3",
-          "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
-          "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
-          "requires": {
-            "deep-is": "~0.1.3",
-            "fast-levenshtein": "~2.0.6",
-            "levn": "~0.3.0",
-            "prelude-ls": "~1.1.2",
-            "type-check": "~0.3.2",
-            "word-wrap": "~1.2.3"
-          }
-        },
-        "prelude-ls": {
-          "version": "1.1.2",
-          "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-          "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
-        },
-        "regexpp": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-2.0.1.tgz",
-          "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw=="
-        },
         "snarkjs": {
           "version": "git+https://github.com/peppersec/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
           "from": "git+https://github.com/peppersec/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
@@ -947,64 +912,6 @@
             "eslint": "^5.16.0",
             "keccak": "^2.0.0",
             "yargs": "^12.0.5"
-          },
-          "dependencies": {
-            "eslint": {
-              "version": "5.16.0",
-              "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
-              "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
-              "requires": {
-                "@babel/code-frame": "^7.0.0",
-                "ajv": "^6.9.1",
-                "chalk": "^2.1.0",
-                "cross-spawn": "^6.0.5",
-                "debug": "^4.0.1",
-                "doctrine": "^3.0.0",
-                "eslint-scope": "^4.0.3",
-                "eslint-utils": "^1.3.1",
-                "eslint-visitor-keys": "^1.0.0",
-                "espree": "^5.0.1",
-                "esquery": "^1.0.1",
-                "esutils": "^2.0.2",
-                "file-entry-cache": "^5.0.1",
-                "functional-red-black-tree": "^1.0.1",
-                "glob": "^7.1.2",
-                "globals": "^11.7.0",
-                "ignore": "^4.0.6",
-                "import-fresh": "^3.0.0",
-                "imurmurhash": "^0.1.4",
-                "inquirer": "^6.2.2",
-                "js-yaml": "^3.13.0",
-                "json-stable-stringify-without-jsonify": "^1.0.1",
-                "levn": "^0.3.0",
-                "lodash": "^4.17.11",
-                "minimatch": "^3.0.4",
-                "mkdirp": "^0.5.1",
-                "natural-compare": "^1.4.0",
-                "optionator": "^0.8.2",
-                "path-is-inside": "^1.0.2",
-                "progress": "^2.0.0",
-                "regexpp": "^2.0.1",
-                "semver": "^5.5.1",
-                "strip-ansi": "^4.0.0",
-                "strip-json-comments": "^2.0.1",
-                "table": "^5.2.3",
-                "text-table": "^0.2.0"
-              }
-            }
-          }
-        },
-        "strip-json-comments": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
-        },
-        "type-check": {
-          "version": "0.3.2",
-          "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
-          "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-          "requires": {
-            "prelude-ls": "~1.1.2"
           }
         }
       }
@@ -1473,9 +1380,9 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
     "eslint": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.5.0.tgz",
-      "integrity": "sha512-vlUP10xse9sWt9SGRtcr1LAC67BENcQMFeV+w5EvLEoFe3xJ8cF1Skd0msziRx/VMC+72B4DxreCE+OR12OA6Q==",
+      "version": "7.7.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.7.0.tgz",
+      "integrity": "sha512-1KUxLzos0ZVsyL81PnRN335nDtQ8/vZUD6uMtWbF+5zDtjKcsklIi78XoE0MVL93QvWTu+E5y44VyyCsOMBrIg==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
@@ -1516,6 +1423,12 @@
         "v8-compile-cache": "^2.0.3"
       },
       "dependencies": {
+        "acorn": {
+          "version": "7.4.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.0.tgz",
+          "integrity": "sha512-+G7P8jJmCHr+S+cLfQxygbWhXy+8YTVGzAkpEbcLo2mLoL7tij/VG41QSHACSf5QgYRhMZYHuNc6drJaO0Da+w==",
+          "dev": true
+        },
         "ansi-regex": {
           "version": "5.0.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
@@ -1568,18 +1481,93 @@
             "which": "^2.0.1"
           }
         },
+        "eslint-scope": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.0.tgz",
+          "integrity": "sha512-iiGRvtxWqgtx5m8EyQUJihBloE4EnYeGE/bz1wSPwJE6tZuJUtHlhqDM4Xj2ukE8Dyy1+HCZ4hE0fzIVMzb58w==",
+          "dev": true,
+          "requires": {
+            "esrecurse": "^4.1.0",
+            "estraverse": "^4.1.1"
+          }
+        },
+        "eslint-utils": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-2.1.0.tgz",
+          "integrity": "sha512-w94dQYoauyvlDc43XnGB8lU3Zt713vNChgt4EWwhXAP2XkBvndfxF0AgIqKOOasjPIPzj9JqgwkwbCYD0/V3Zg==",
+          "dev": true,
+          "requires": {
+            "eslint-visitor-keys": "^1.1.0"
+          }
+        },
+        "espree": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/espree/-/espree-7.2.0.tgz",
+          "integrity": "sha512-H+cQ3+3JYRMEIOl87e7QdHX70ocly5iW4+dttuR8iYSPr/hXKFb+7dBsZ7+u1adC4VrnPlTkv0+OwuPnDop19g==",
+          "dev": true,
+          "requires": {
+            "acorn": "^7.3.1",
+            "acorn-jsx": "^5.2.0",
+            "eslint-visitor-keys": "^1.3.0"
+          }
+        },
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
         "has-flag": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
           "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
           "dev": true
         },
+        "levn": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+          "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
+          "dev": true,
+          "requires": {
+            "prelude-ls": "^1.2.1",
+            "type-check": "~0.4.0"
+          }
+        },
+        "optionator": {
+          "version": "0.9.1",
+          "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
+          "integrity": "sha512-74RlY5FCnhq4jRxVUPKDaRwrVNXMqsGsiW6AJw4XK8hmtm10wC0ypZBLw5IIp85NZMr91+qd1RvvENwg7jjRFw==",
+          "dev": true,
+          "requires": {
+            "deep-is": "^0.1.3",
+            "fast-levenshtein": "^2.0.6",
+            "levn": "^0.4.1",
+            "prelude-ls": "^1.2.1",
+            "type-check": "^0.4.0",
+            "word-wrap": "^1.2.3"
+          }
+        },
         "path-key": {
           "version": "3.1.1",
           "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
           "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
           "dev": true
         },
+        "prelude-ls": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+          "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+          "dev": true
+        },
+        "regexpp": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
+          "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
+          "dev": true
+        },
         "semver": {
           "version": "7.3.2",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
@@ -1610,6 +1598,12 @@
             "ansi-regex": "^5.0.0"
           }
         },
+        "strip-json-comments": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
+          "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
+          "dev": true
+        },
         "supports-color": {
           "version": "7.1.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.1.0.tgz",
@@ -1619,6 +1613,15 @@
             "has-flag": "^4.0.0"
           }
         },
+        "type-check": {
+          "version": "0.4.0",
+          "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+          "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+          "dev": true,
+          "requires": {
+            "prelude-ls": "^1.2.1"
+          }
+        },
         "which": {
           "version": "2.0.2",
           "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -1631,20 +1634,18 @@
       }
     },
     "eslint-scope": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.0.tgz",
-      "integrity": "sha512-iiGRvtxWqgtx5m8EyQUJihBloE4EnYeGE/bz1wSPwJE6tZuJUtHlhqDM4Xj2ukE8Dyy1+HCZ4hE0fzIVMzb58w==",
-      "dev": true,
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
+      "integrity": "sha512-p7VutNr1O/QrxysMo3E45FjYDTeXBy0iTltPFNSqKAIfjDSXC+4dj+qfyuD8bfAXrW/y6lW3O76VaYNPKfpKrg==",
       "requires": {
         "esrecurse": "^4.1.0",
         "estraverse": "^4.1.1"
       }
     },
     "eslint-utils": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-2.1.0.tgz",
-      "integrity": "sha512-w94dQYoauyvlDc43XnGB8lU3Zt713vNChgt4EWwhXAP2XkBvndfxF0AgIqKOOasjPIPzj9JqgwkwbCYD0/V3Zg==",
-      "dev": true,
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.3.tgz",
+      "integrity": "sha512-fbBN5W2xdY45KulGXmLHZ3c3FHfVYmKg0IrAKGOkT/464PQsx2UeIzfz1RmEci+KLm1bBaAzZAh8+/E+XAeZ8Q==",
       "requires": {
         "eslint-visitor-keys": "^1.1.0"
       }
@@ -1655,14 +1656,13 @@
       "integrity": "sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ=="
     },
     "espree": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-7.2.0.tgz",
-      "integrity": "sha512-H+cQ3+3JYRMEIOl87e7QdHX70ocly5iW4+dttuR8iYSPr/hXKFb+7dBsZ7+u1adC4VrnPlTkv0+OwuPnDop19g==",
-      "dev": true,
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
+      "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
       "requires": {
-        "acorn": "^7.3.1",
-        "acorn-jsx": "^5.2.0",
-        "eslint-visitor-keys": "^1.3.0"
+        "acorn": "^6.0.7",
+        "acorn-jsx": "^5.0.0",
+        "eslint-visitor-keys": "^1.0.0"
       }
     },
     "esprima": {
@@ -1679,9 +1679,9 @@
       },
       "dependencies": {
         "estraverse": {
-          "version": "5.1.0",
-          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.1.0.tgz",
-          "integrity": "sha512-FyohXK+R0vE+y1nHLoBM7ZTyqRpqAlhdZHCWIWEviFLiGB8b04H6bQs8G+XTthacvT8VuwvteiP7RJSxMs8UEw=="
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.2.0.tgz",
+          "integrity": "sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ=="
         }
       }
     },
@@ -2181,13 +2181,9 @@
       }
     },
     "globals": {
-      "version": "12.4.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
-      "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
-      "dev": true,
-      "requires": {
-        "type-fest": "^0.8.1"
-      }
+      "version": "11.12.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
+      "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA=="
     },
     "got": {
       "version": "9.6.0",
@@ -2531,9 +2527,9 @@
       "integrity": "sha1-caUMhCnfync8kqOQpKA7OfzVHT4="
     },
     "is-regex": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.1.0.tgz",
-      "integrity": "sha512-iI97M8KTWID2la5uYXlkbSDQIg4F6o1sYboZKKTDpnDQMLtUL86zxhgDet3Q2SriaYsyGqZ6Mn2SjbRKeLHdqw==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.1.1.tgz",
+      "integrity": "sha512-1+QkEcxiLlB7VEyFtyBg94e08OAsvq7FUBgApTq/w2ymCLyKJgDPsybBENVtA7XCQEgEXxKPonG+mvYRxh/LIg==",
       "dev": true,
       "requires": {
         "has-symbols": "^1.0.1"
@@ -2718,13 +2714,12 @@
       }
     },
     "levn": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
-      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
-      "dev": true,
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
+      "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
       "requires": {
-        "prelude-ls": "^1.2.1",
-        "type-check": "~0.4.0"
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2"
       }
     },
     "locate-path": {
@@ -2737,9 +2732,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.19",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.19.tgz",
-      "integrity": "sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ=="
+      "version": "4.17.20",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
+      "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA=="
     },
     "log-symbols": {
       "version": "3.0.0",
@@ -2907,9 +2902,9 @@
       }
     },
     "mocha": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-8.1.0.tgz",
-      "integrity": "sha512-sI0gaI1I/jPVu3KFpnveWGadfe3JNBAENqgTUPgLZAUppu725zS2mrVztzAgIR8DUscuS4doEBTx9LATC+HSeA==",
+      "version": "8.1.1",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-8.1.1.tgz",
+      "integrity": "sha512-p7FuGlYH8t7gaiodlFreseLxEmxTgvyG9RgPHODFPySNhwUehu8NIb0vdSt3WFckSneswZ0Un5typYcWElk7HQ==",
       "dev": true,
       "requires": {
         "ansi-colors": "4.1.1",
@@ -3353,17 +3348,16 @@
       }
     },
     "optionator": {
-      "version": "0.9.1",
-      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
-      "integrity": "sha512-74RlY5FCnhq4jRxVUPKDaRwrVNXMqsGsiW6AJw4XK8hmtm10wC0ypZBLw5IIp85NZMr91+qd1RvvENwg7jjRFw==",
-      "dev": true,
+      "version": "0.8.3",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
+      "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
       "requires": {
-        "deep-is": "^0.1.3",
-        "fast-levenshtein": "^2.0.6",
-        "levn": "^0.4.1",
-        "prelude-ls": "^1.2.1",
-        "type-check": "^0.4.0",
-        "word-wrap": "^1.2.3"
+        "deep-is": "~0.1.3",
+        "fast-levenshtein": "~2.0.6",
+        "levn": "~0.3.0",
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2",
+        "word-wrap": "~1.2.3"
       }
     },
     "os-locale": {
@@ -3521,10 +3515,9 @@
       "dev": true
     },
     "prelude-ls": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
-      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
-      "dev": true
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
+      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
     },
     "prepend-http": {
       "version": "2.0.0",
@@ -3663,10 +3656,9 @@
       }
     },
     "regexpp": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
-      "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
-      "dev": true
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-2.0.1.tgz",
+      "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw=="
     },
     "request": {
       "version": "2.88.2",
@@ -3774,9 +3766,9 @@
       "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ=="
     },
     "rxjs": {
-      "version": "6.6.0",
-      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.0.tgz",
-      "integrity": "sha512-3HMA8z/Oz61DUHe+SdOiQyzIf4tOx5oQHmMir7IZEu6TMqCLHT4LRcmNaUS0NwOz8VLvmmBduMsoaUvMaIiqzg==",
+      "version": "6.6.2",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.2.tgz",
+      "integrity": "sha512-BHdBMVoWC2sL26w//BCu3YzKT4s2jip/WhwsGEDmeKYBhKDZeYezVUnHatYB7L85v5xs0BAQmg6BEYJEKxBabg==",
       "requires": {
         "tslib": "^1.9.0"
       }
@@ -3964,11 +3956,6 @@
         "yargs": "^12.0.5"
       },
       "dependencies": {
-        "acorn": {
-          "version": "6.4.1",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
-          "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA=="
-        },
         "eslint": {
           "version": "5.16.0",
           "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
@@ -4011,83 +3998,6 @@
             "table": "^5.2.3",
             "text-table": "^0.2.0"
           }
-        },
-        "eslint-scope": {
-          "version": "4.0.3",
-          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
-          "integrity": "sha512-p7VutNr1O/QrxysMo3E45FjYDTeXBy0iTltPFNSqKAIfjDSXC+4dj+qfyuD8bfAXrW/y6lW3O76VaYNPKfpKrg==",
-          "requires": {
-            "esrecurse": "^4.1.0",
-            "estraverse": "^4.1.1"
-          }
-        },
-        "eslint-utils": {
-          "version": "1.4.3",
-          "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.3.tgz",
-          "integrity": "sha512-fbBN5W2xdY45KulGXmLHZ3c3FHfVYmKg0IrAKGOkT/464PQsx2UeIzfz1RmEci+KLm1bBaAzZAh8+/E+XAeZ8Q==",
-          "requires": {
-            "eslint-visitor-keys": "^1.1.0"
-          }
-        },
-        "espree": {
-          "version": "5.0.1",
-          "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
-          "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
-          "requires": {
-            "acorn": "^6.0.7",
-            "acorn-jsx": "^5.0.0",
-            "eslint-visitor-keys": "^1.0.0"
-          }
-        },
-        "globals": {
-          "version": "11.12.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
-          "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA=="
-        },
-        "levn": {
-          "version": "0.3.0",
-          "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
-          "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
-          "requires": {
-            "prelude-ls": "~1.1.2",
-            "type-check": "~0.3.2"
-          }
-        },
-        "optionator": {
-          "version": "0.8.3",
-          "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
-          "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
-          "requires": {
-            "deep-is": "~0.1.3",
-            "fast-levenshtein": "~2.0.6",
-            "levn": "~0.3.0",
-            "prelude-ls": "~1.1.2",
-            "type-check": "~0.3.2",
-            "word-wrap": "~1.2.3"
-          }
-        },
-        "prelude-ls": {
-          "version": "1.1.2",
-          "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-          "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
-        },
-        "regexpp": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-2.0.1.tgz",
-          "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw=="
-        },
-        "strip-json-comments": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
-        },
-        "type-check": {
-          "version": "0.3.2",
-          "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
-          "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-          "requires": {
-            "prelude-ls": "~1.1.2"
-          }
         }
       }
     },
@@ -4187,10 +4097,9 @@
       }
     },
     "strip-json-comments": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
-      "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
-      "dev": true
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
     },
     "supports-color": {
       "version": "5.5.0",
@@ -4395,12 +4304,11 @@
       "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg=="
     },
     "type-check": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
-      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
-      "dev": true,
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
       "requires": {
-        "prelude-ls": "^1.2.1"
+        "prelude-ls": "~1.1.2"
       }
     },
     "type-detect": {
diff --git a/package.json b/package.json
index cdd8ee0..1112dcb 100644
--- a/package.json
+++ b/package.json
@@ -1,19 +1,25 @@
 {
   "name": "fixed-merkle-tree",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "description": "Fixed depth merkle tree implementation with sequential inserts",
   "main": "src/merkleTree.js",
   "scripts": {
     "test": "mocha",
     "lint": "eslint ."
   },
-  "keywords": ["merkle", "tree", "merkleTree"],
+  "keywords": [
+    "merkle",
+    "tree",
+    "merkleTree"
+  ],
   "author": "Roman Semenov <semenov.roma@gmail.com>",
   "license": "ISC",
-  "files": ["src/*"],
+  "files": [
+    "src/*"
+  ],
   "dependencies": {
     "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
-    "circomlib": "git+https://github.com/tornadocash/circomlib.git#c372f14d324d57339c88451834bf2824e73bbdbc"
+    "circomlib": "git+https://github.com/tornadocash/circomlib.git#6282474dc03e47a7cba1486e6ac8df08842314c3"
   },
   "devDependencies": {
     "babel-eslint": "^10.1.0",