diff --git a/example/package.json b/example/package.json
index cb16b69..40aa7c6 100644
--- a/example/package.json
+++ b/example/package.json
@@ -12,7 +12,8 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",
+    "up": "rm -rf ./node-modules && cd .. && yarn build && cd example && yarn && yarn start"
   },
   "eslintConfig": {
     "extends": "react-app"
@@ -34,4 +35,4 @@
     "semi": false,
     "singleQuote": true
   }
-}
+}
\ No newline at end of file
diff --git a/example/src/App.js b/example/src/App.js
index b34af25..a06c083 100644
--- a/example/src/App.js
+++ b/example/src/App.js
@@ -6,11 +6,10 @@ import { LibraClient, LibraNetwork, LibraWallet } from 'libra-web'
 
 class App extends React.Component {
   onTransfer = async () => {
-    const client = new LibraClient({ network: LibraNetwork.Testnet })
-    const wallet = new LibraWallet({
-      mnemonic:
-        'silk rural awake receive timber bronze mutual message squeeze rug result shoot settle guide wheat believe dune fall share syrup picture true offer slow',
-    })
+    const client = new LibraClient()
+    const wallet = new LibraWallet(
+      'silk rural awake receive timber bronze mutual message squeeze rug result shoot settle guide wheat believe dune fall share syrup picture true offer slow',
+    )
 
     // TEST ACCOUNT CREATION
     const account1 = wallet.getAccount()
diff --git a/example/yarn.lock b/example/yarn.lock
index 0a97cf8..c8a8865 100644
--- a/example/yarn.lock
+++ b/example/yarn.lock
@@ -2078,14 +2078,6 @@ asap@~2.0.6:
   resolved "https://registry.yarnpkg.com/asap/-/asap-2.0.6.tgz#e50347611d7e690943208bbdafebcbc2fb866d46"
   integrity sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY=
 
-ascli@~1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/ascli/-/ascli-1.0.1.tgz#bcfa5974a62f18e81cabaeb49732ab4a88f906bc"
-  integrity sha1-vPpZdKYvGOgcq660lzKrSoj5Brw=
-  dependencies:
-    colour "~0.7.1"
-    optjs "~3.2.2"
-
 asn1.js@^4.0.0:
   version "4.10.1"
   resolved "https://registry.yarnpkg.com/asn1.js/-/asn1.js-4.10.1.tgz#b9c2bf5805f1e64aadeed6df3a2bfafb5a73f5a0"
@@ -2388,6 +2380,13 @@ big.js@^5.2.2:
   resolved "https://registry.yarnpkg.com/big.js/-/big.js-5.2.2.tgz#65f0af382f578bcdc742bd9c281e9cb2d7768328"
   integrity sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==
 
+bigint-buffer@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/bigint-buffer/-/bigint-buffer-1.1.2.tgz#b7edfaf3a88d0767aed7edc671d6bae4b1021575"
+  integrity sha512-gof9NgbodUgCXD2aUHfUKk5KUDk6/zPlwE+YYpRM2t7zS0K/6WipJFWfziIY+EavxFDuGUnuuQQzzvNcckPKNA==
+  dependencies:
+    bindings "^1.3.0"
+
 bignumber.js@^9.0.0:
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-9.0.0.tgz#805880f84a329b5eac6e7cb6f8274b6d82bdf075"
@@ -2398,6 +2397,13 @@ binary-extensions@^1.0.0:
   resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.13.0.tgz#9523e001306a32444b907423f1de2164222f6ab1"
   integrity sha512-EgmjVLMn22z7eGGv3kcnHwSnJXmFHjISTY9E/S5lIcTD3Oxw05QTcBLNkJFzcb3cNueUdF/IN4U+d78V0zO8Hw==
 
+bindings@^1.3.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.5.0.tgz#10353c9e945334bc0511a6d90b38fbc7c9c504df"
+  integrity sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==
+  dependencies:
+    file-uri-to-path "1.0.0"
+
 bip39@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/bip39/-/bip39-3.0.2.tgz#2baf42ff3071fc9ddd5103de92e8f80d9257ee32"
@@ -2622,13 +2628,6 @@ builtin-status-codes@^3.0.0:
   resolved "https://registry.yarnpkg.com/builtin-status-codes/-/builtin-status-codes-3.0.0.tgz#85982878e21b98e1c66425e03d0174788f569ee8"
   integrity sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug=
 
-bytebuffer@~5:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/bytebuffer/-/bytebuffer-5.0.1.tgz#582eea4b1a873b6d020a48d58df85f0bba6cfddd"
-  integrity sha1-WC7qSxqHO20CCkjVjfhfC7ps/d0=
-  dependencies:
-    long "~3"
-
 bytes@3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.0.0.tgz#d32815404d689699f85a4ea4fa8755dd13a96048"
@@ -2706,11 +2705,6 @@ camel-case@3.0.x:
     no-case "^2.2.0"
     upper-case "^1.1.1"
 
-camelcase@^2.0.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-2.1.1.tgz#7c1d16d679a1bbe59ca02cacecfb011e201f5a1f"
-  integrity sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=
-
 camelcase@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
@@ -2885,15 +2879,6 @@ cli-width@^2.0.0:
   resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-2.2.0.tgz#ff19ede8a9a5e579324147b0c11f0fbcbabed639"
   integrity sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=
 
-cliui@^3.0.3:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/cliui/-/cliui-3.2.0.tgz#120601537a916d29940f934da3b48d585a39213d"
-  integrity sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=
-  dependencies:
-    string-width "^1.0.1"
-    strip-ansi "^3.0.1"
-    wrap-ansi "^2.0.0"
-
 cliui@^4.0.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/cliui/-/cliui-4.1.0.tgz#348422dbe82d800b3022eef4f6ac10bf2e4d1b49"
@@ -2984,11 +2969,6 @@ color@^3.0.0:
     color-convert "^1.9.1"
     color-string "^1.5.2"
 
-colour@~0.7.1:
-  version "0.7.1"
-  resolved "https://registry.yarnpkg.com/colour/-/colour-0.7.1.tgz#9cb169917ec5d12c0736d3e8685746df1cadf778"
-  integrity sha1-nLFpkX7F0SwHNtPoaFdG3xyt93g=
-
 combined-stream@^1.0.6, combined-stream@~1.0.6:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.7.tgz#2d1d24317afb8abe95d6d2c0b07b57813539d828"
@@ -3534,7 +3514,7 @@ debug@^4.0.1, debug@^4.1.0, debug@^4.1.1:
   dependencies:
     ms "^2.1.1"
 
-decamelize@^1.1.1, decamelize@^1.2.0:
+decamelize@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
   integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
@@ -4409,6 +4389,11 @@ file-loader@3.0.1:
     loader-utils "^1.0.2"
     schema-utils "^1.0.0"
 
+file-uri-to-path@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz#553a7b8446ff6f684359c445f1e37a05dacc33dd"
+  integrity sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==
+
 filesize@3.6.1:
   version "3.6.1"
   resolved "https://registry.yarnpkg.com/filesize/-/filesize-3.6.1.tgz#090bb3ee01b6f801a8a8be99d31710b3422bb317"
@@ -4731,18 +4716,6 @@ glob@^7.0.3, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3:
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
-glob@^7.0.5:
-  version "7.1.4"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.4.tgz#aa608a2f6c577ad357e1ae5a5c26d9a8d1969255"
-  integrity sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==
-  dependencies:
-    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"
-
 global-modules@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/global-modules/-/global-modules-2.0.0.tgz#997605ad2345f27f51539bea26574421215c7780"
@@ -4808,17 +4781,6 @@ grpc-web@^1.0.4:
   resolved "https://registry.yarnpkg.com/grpc-web/-/grpc-web-1.0.4.tgz#dac13f3a1b42092595a8807f724aeaa5f5d6487a"
   integrity sha512-CjIA05C1G9n0/aT5YrQ8SAYNh5foHZRVK+1yN81Ez9vpNQCmrvXCWQBOHlQK7tJg3EqC5m8F99XQRfAi+K8CyA==
 
-grpc@^1.21.1:
-  version "1.21.1"
-  resolved "https://registry.yarnpkg.com/grpc/-/grpc-1.21.1.tgz#541c0f4bccffcf6aef200536179594633d4579cf"
-  integrity sha512-PFsZQazf62nP05a0xm23mlImMuw5oVlqF/0zakmsdqJgvbABe+d6VThY2PfhqJmWEL/FhQ6QNYsxS5EAM6++7g==
-  dependencies:
-    lodash.camelcase "^4.3.0"
-    lodash.clone "^4.5.0"
-    nan "^2.13.2"
-    node-pre-gyp "^0.13.0"
-    protobufjs "^5.0.3"
-
 gzip-size@5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/gzip-size/-/gzip-size-5.0.0.tgz#a55ecd99222f4c48fd8c01c625ce3b349d0a0e80"
@@ -5313,11 +5275,6 @@ invariant@^2.2.2, invariant@^2.2.4:
   dependencies:
     loose-envify "^1.0.0"
 
-invert-kv@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/invert-kv/-/invert-kv-1.0.0.tgz#104a8e4aaca6d3d8cd157a8ef8bfab2d7a3ffdb6"
-  integrity sha1-EEqOSqym09jNFXqO+L+rLXo//bY=
-
 invert-kv@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/invert-kv/-/invert-kv-2.0.0.tgz#7393f5afa59ec9ff5f67a27620d11c226e3eec02"
@@ -6068,6 +6025,11 @@ js-levenshtein@^1.1.3:
   resolved "https://registry.yarnpkg.com/js-levenshtein/-/js-levenshtein-1.1.6.tgz#c6cee58eb3550372df8deb85fad5ce66ce01d59d"
   integrity sha512-X2BB11YZtrRqY4EnQcLX5Rh373zbK4alC1FW7D7MBhL2gtcC17cTnr6DmfHZeS0s2rTHjUTMMHfG7gO8SSdw+g==
 
+js-sha3@^0.8.0:
+  version "0.8.0"
+  resolved "https://registry.yarnpkg.com/js-sha3/-/js-sha3-0.8.0.tgz#b9b7a5da73afad7dedd0f8c463954cbde6818840"
+  integrity sha512-gF1cRrHhIzNfToc802P800N8PpXS+evLLXfsVpowqmAFR9uwbi89WvXg2QspOmXL8QL86J4T1EpFu+yUkwJY3Q==
+
 "js-tokens@^3.0.0 || ^4.0.0", js-tokens@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
@@ -6312,13 +6274,6 @@ lazy-cache@^1.0.3:
   resolved "https://registry.yarnpkg.com/lazy-cache/-/lazy-cache-1.0.4.tgz#a1d78fc3a50474cb80845d3b3b6e1da49a446e8e"
   integrity sha1-odePw6UEdMuAhF07O24dpJpEbo4=
 
-lcid@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/lcid/-/lcid-1.0.0.tgz#308accafa0bc483a3867b4b6f2b9506251d1b835"
-  integrity sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=
-  dependencies:
-    invert-kv "^1.0.0"
-
 lcid@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/lcid/-/lcid-2.0.0.tgz#6ef5d2df60e52f82eb228a4c373e8d1f397253cf"
@@ -6348,14 +6303,15 @@ levn@^0.3.0, levn@~0.3.0:
   version "0.1.0"
   dependencies:
     axios "^0.19.0"
+    bigint-buffer "^1.1.2"
     bignumber.js "^9.0.0"
     bip39 "^3.0.2"
     elliptic "^6.4.1"
     futoin-hkdf "^1.0.3"
     google-protobuf "^3.8.0"
-    grpc "^1.21.1"
     grpc-web "^1.0.4"
     int64-buffer "^0.99.1007"
+    js-sha3 "^0.8.0"
     protobufjs "^6.8.8"
     sha3 "^2.0.4"
 
@@ -6422,16 +6378,6 @@ lodash._reinterpolate@~3.0.0:
   resolved "https://registry.yarnpkg.com/lodash._reinterpolate/-/lodash._reinterpolate-3.0.0.tgz#0ccf2d89166af03b3663c796538b75ac6e114d9d"
   integrity sha1-DM8tiRZq8Ds2Y8eWU4t1rG4RTZ0=
 
-lodash.camelcase@^4.3.0:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/lodash.camelcase/-/lodash.camelcase-4.3.0.tgz#b28aa6288a2b9fc651035c7711f65ab6190331a6"
-  integrity sha1-soqmKIorn8ZRA1x3EfZathkDMaY=
-
-lodash.clone@^4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/lodash.clone/-/lodash.clone-4.5.0.tgz#195870450f5a13192478df4bc3d23d2dea1907b6"
-  integrity sha1-GVhwRQ9aExkkeN9Lw9I9LeoZB7Y=
-
 lodash.get@^4.4.2:
   version "4.4.2"
   resolved "https://registry.yarnpkg.com/lodash.get/-/lodash.get-4.4.2.tgz#2d177f652fa31e939b4438d5341499dfa3825e99"
@@ -6492,11 +6438,6 @@ long@^4.0.0:
   resolved "https://registry.yarnpkg.com/long/-/long-4.0.0.tgz#9a7b71cfb7d361a194ea555241c92f7468d5bf28"
   integrity sha512-XsP+KhQif4bjX1kbuSiySJFNAehNxgLb6hPRGJ9QsUr8ajHkuXGdrHmFUTUUXhDwVX2R5bY4JNZEwbUiMhV+MA==
 
-long@~3:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/long/-/long-3.2.0.tgz#d821b7138ca1cb581c172990ef14db200b5c474b"
-  integrity sha1-2CG3E4yhy1gcFymQ7xTbIAtcR0s=
-
 loose-envify@^1.0.0, loose-envify@^1.1.0, loose-envify@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/loose-envify/-/loose-envify-1.4.0.tgz#71ee51fa7be4caec1a63839f7e682d8132d30caf"
@@ -6828,11 +6769,6 @@ mute-stream@0.0.7:
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
   integrity sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s=
 
-nan@^2.13.2:
-  version "2.14.0"
-  resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
-  integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==
-
 nan@^2.9.2:
   version "2.12.1"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.12.1.tgz#7b1aa193e9aa86057e3c7bbd0ac448e770925552"
@@ -6967,22 +6903,6 @@ node-pre-gyp@^0.10.0:
     semver "^5.3.0"
     tar "^4"
 
-node-pre-gyp@^0.13.0:
-  version "0.13.0"
-  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.13.0.tgz#df9ab7b68dd6498137717838e4f92a33fc9daa42"
-  integrity sha512-Md1D3xnEne8b/HGVQkZZwV27WUi1ZRuZBij24TNaZwUPU3ZAFtvT6xxJGaUVillfmMKnn5oD1HoGsp2Ftik7SQ==
-  dependencies:
-    detect-libc "^1.0.2"
-    mkdirp "^0.5.1"
-    needle "^2.2.1"
-    nopt "^4.0.1"
-    npm-packlist "^1.1.6"
-    npmlog "^4.0.2"
-    rc "^1.2.7"
-    rimraf "^2.6.1"
-    semver "^5.3.0"
-    tar "^4"
-
 node-releases@^1.1.13, node-releases@^1.1.23:
   version "1.1.25"
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.25.tgz#0c2d7dbc7fed30fbe02a9ee3007b8c90bf0133d3"
@@ -7241,11 +7161,6 @@ optionator@^0.8.1, optionator@^0.8.2:
     type-check "~0.3.2"
     wordwrap "~1.0.0"
 
-optjs@~3.2.2:
-  version "3.2.2"
-  resolved "https://registry.yarnpkg.com/optjs/-/optjs-3.2.2.tgz#69a6ce89c442a44403141ad2f9b370bd5bb6f4ee"
-  integrity sha1-aabOicRCpEQDFBrS+bNwvVu29O4=
-
 original@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/original/-/original-1.0.2.tgz#e442a61cffe1c5fd20a65f3261c26663b303f25f"
@@ -7263,13 +7178,6 @@ os-homedir@^1.0.0:
   resolved "https://registry.yarnpkg.com/os-homedir/-/os-homedir-1.0.2.tgz#ffbc4988336e0e833de0c168c7ef152121aa7fb3"
   integrity sha1-/7xJiDNuDoM94MFox+8VISGqf7M=
 
-os-locale@^1.4.0:
-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-1.4.0.tgz#20f9f17ae29ed345e8bde583b13d2009803c14d9"
-  integrity sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=
-  dependencies:
-    lcid "^1.0.0"
-
 os-locale@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-3.1.0.tgz#a802a6ee17f24c10483ab9935719cef4ed16bf1a"
@@ -8341,16 +8249,6 @@ property-information@^5.0.0, property-information@^5.0.1:
   dependencies:
     xtend "^4.0.1"
 
-protobufjs@^5.0.3:
-  version "5.0.3"
-  resolved "https://registry.yarnpkg.com/protobufjs/-/protobufjs-5.0.3.tgz#e4dfe9fb67c90b2630d15868249bcc4961467a17"
-  integrity sha512-55Kcx1MhPZX0zTbVosMQEO5R6/rikNXd9b6RQK4KSPcrSIIwoXTtebIczUrXlwaSrbz4x8XUVThGPob1n8I4QA==
-  dependencies:
-    ascli "~1"
-    bytebuffer "~5"
-    glob "^7.0.5"
-    yargs "^3.10.0"
-
 protobufjs@^6.8.8:
   version "6.8.8"
   resolved "https://registry.yarnpkg.com/protobufjs/-/protobufjs-6.8.8.tgz#c8b4f1282fd7a90e6f5b109ed11c84af82908e7c"
@@ -10472,11 +10370,6 @@ wide-align@^1.1.0:
   dependencies:
     string-width "^1.0.2 || 2"
 
-window-size@^0.1.4:
-  version "0.1.4"
-  resolved "https://registry.yarnpkg.com/window-size/-/window-size-0.1.4.tgz#f8e1aa1ee5a53ec5bf151ffa09742a6ad7697876"
-  integrity sha1-+OGqHuWlPsW/FR/6CXQqatdpeHY=
-
 wordwrap@~0.0.2:
   version "0.0.3"
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.3.tgz#a3d5da6cd5c0bc0008d37234bbaf1bed63059107"
@@ -10704,11 +10597,6 @@ xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.1:
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
   integrity sha1-pcbVMr5lbiPbgg77lDofBJmNY68=
 
-y18n@^3.2.0:
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/y18n/-/y18n-3.2.1.tgz#6d15fba884c08679c0d77e88e7759e811e07fa41"
-  integrity sha1-bRX7qITAhnnA136I53WegR4H+kE=
-
 "y18n@^3.2.1 || ^4.0.0", y18n@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
@@ -10769,16 +10657,3 @@ yargs@^12.0.2:
     which-module "^2.0.0"
     y18n "^3.2.1 || ^4.0.0"
     yargs-parser "^11.1.1"
-
-yargs@^3.10.0:
-  version "3.32.0"
-  resolved "https://registry.yarnpkg.com/yargs/-/yargs-3.32.0.tgz#03088e9ebf9e756b69751611d2a5ef591482c995"
-  integrity sha1-AwiOnr+edWtpdRYR0qXvWRSCyZU=
-  dependencies:
-    camelcase "^2.0.1"
-    cliui "^3.0.3"
-    decamelize "^1.1.1"
-    os-locale "^1.4.0"
-    string-width "^1.0.1"
-    window-size "^0.1.4"
-    y18n "^3.2.0"
diff --git a/package.json b/package.json
index f671fcb..1d976d8 100644
--- a/package.json
+++ b/package.json
@@ -2,8 +2,8 @@
   "name": "libra-web",
   "version": "0.1.0",
   "description": "A library for connecting with libra from browser and Node.js",
-  "main": "build/index.js",
-  "types": "build/index.d.ts",
+  "main": "build/libra-web/index.js",
+  "types": "build/libra-web/index.d.ts",
   "files": [
     "build/**/*",
     "packages/**/*"
@@ -13,14 +13,14 @@
     "url": "https://github.com/bandprotocol/libra-web.git"
   },
   "scripts": {
-    "build": "NODE_ENV=production tsc",
+    "build": "NODE_ENV=production tsc --build",
     "format": "prettier --write \"packages/**/*.ts\" \"test/**/*.ts\"",
     "lint": "tslint -p tsconfig.json",
     "lint:fix": "tslint -p tsconfig.json --fix",
     "prepare": "npm run build",
     "prepublishOnly": "npm test && npm run lint",
-    "test": "NODE_ENV=test jest --verbose",
-    "test-prod": "NODE_ENV=production jest --verbose",
+    "test": "NODE_ENV=test jest --verbose false",
+    "test-prod": "NODE_ENV=production jest --verbose false",
     "proxy": "cd ./scripts/proxy && ./run_proxy.sh"
   },
   "keywords": [
@@ -33,6 +33,7 @@
   "license": "MIT",
   "dependencies": {
     "axios": "^0.19.0",
+    "bigint-buffer": "^1.1.2",
     "bignumber.js": "^9.0.0",
     "bip39": "^3.0.2",
     "elliptic": "^6.4.1",
@@ -64,4 +65,4 @@
     "semi": false,
     "singleQuote": true
   }
-}
+}
\ No newline at end of file
diff --git a/packages/libra-web-account/Accounts.ts b/packages/libra-web-account/Accounts.ts
index 9076097..4a0fa14 100644
--- a/packages/libra-web-account/Accounts.ts
+++ b/packages/libra-web-account/Accounts.ts
@@ -1,8 +1,8 @@
 import BigNumber from 'bignumber.js'
 import { SHA3 } from 'sha3'
-import { CursorBuffer } from 'libra-web-core-utils/common/CursorBuffer'
-import Addresses from 'libra-web-core-utils/constants/Addresses'
-import { KeyPair } from 'libra-web-core-utils/crypto/Eddsa'
+import { CursorBuffer } from '../libra-web-core-utils/common/CursorBuffer'
+import Addresses from '../libra-web-core-utils/constants/Addresses'
+import { KeyPair } from '../libra-web-core-utils/crypto/Eddsa'
 
 export type AccountStates = AccountState[]
 
diff --git a/packages/libra-web-account/KeyFactory.ts b/packages/libra-web-account/KeyFactory.ts
index aaac215..c5bdecb 100644
--- a/packages/libra-web-account/KeyFactory.ts
+++ b/packages/libra-web-account/KeyFactory.ts
@@ -1,7 +1,8 @@
-import KeyPrefixes from 'libra-web-core-utils/constants/KeyPrefixes'
-import { KeyPair } from 'libra-web-core-utils/crypto/Eddsa'
-import { Hkdf } from 'libra-web-core-utils/crypto/Hkdf'
-import { Pbkdf } from 'libra-web-core-utils/crypto/Pbkdf'
+import { toBufferLE } from 'bigint-buffer'
+import KeyPrefixes from '../libra-web-core-utils/constants/KeyPrefixes'
+import { KeyPair } from '../libra-web-core-utils/crypto/Eddsa'
+import { Hkdf } from '../libra-web-core-utils/crypto/Hkdf'
+import { Pbkdf } from '../libra-web-core-utils/crypto/Pbkdf'
 import { Mnemonic } from './Mnemonic'
 
 /**
@@ -13,10 +14,10 @@ export class Seed {
   public static fromMnemonic(words: string[] | Mnemonic, salt: string = 'LIBRA'): Seed {
     const mnemonic: Mnemonic = Array.isArray(words) ? new Mnemonic(words) : words
     const bytes = new Pbkdf('sha3-256').sha3256Pbkdf2(
-        Buffer.from(mnemonic.toBytes()),
-        Buffer.from(`${KeyPrefixes.MnemonicSalt}${salt}`),
-        2048,
-        32,
+      Buffer.from(mnemonic.toBytes()),
+      Buffer.from(`${KeyPrefixes.MnemonicSalt}${salt}`),
+      2048,
+      32,
     )
     return new Seed(bytes)
   }
@@ -49,12 +50,19 @@ export class KeyFactory {
    *
    */
   public generateKey(childDepth: number): KeyPair {
-    const childDepthBuffer = Buffer.alloc(8)
-    childDepthBuffer.writeBigUInt64LE(BigInt(childDepth))
-    const info = Buffer.concat([
-      Uint8Array.from(Buffer.from(KeyPrefixes.DerivedKey)),
-      Uint8Array.from(childDepthBuffer),
-    ]);
+    // const childDepthBuffer = toBufferLE(BigInt(childDepth), 8)
+    const childDepthBuffer = Buffer.from(
+      BigInt(childDepth)
+        .toString(16)
+        .padStart(16, '0')
+        .slice(0, 16),
+      'hex',
+    )
+    childDepthBuffer.reverse()
+    const info = Buffer.from([
+      ...Uint8Array.from(Buffer.from(KeyPrefixes.DerivedKey)),
+      ...Uint8Array.from(childDepthBuffer),
+    ])
     const secretKey = this.hkdf.expand(this.masterPrk, info, 32)
 
     return KeyPair.fromSecretKey(secretKey)
diff --git a/packages/libra-web-account/Mnemonic.ts b/packages/libra-web-account/Mnemonic.ts
index 8d27f26..0f29192 100644
--- a/packages/libra-web-account/Mnemonic.ts
+++ b/packages/libra-web-account/Mnemonic.ts
@@ -1,6 +1,6 @@
 import { generateMnemonic } from 'bip39'
-import CollectionUtil from 'libra-web-core-utils/common/CollectionUtil'
-import MnemonicWords from 'libra-web-core-utils/constants/MnemonicWords'
+import CollectionUtil from '../libra-web-core-utils/common/CollectionUtil'
+import MnemonicWords from '../libra-web-core-utils/constants/MnemonicWords'
 
 /**
  * Handles logic for loading, writing and encoding mnemonic strings
diff --git a/packages/libra-web-core/index.ts b/packages/libra-web-core/index.ts
index adce872..0ed93cc 100644
--- a/packages/libra-web-core/index.ts
+++ b/packages/libra-web-core/index.ts
@@ -15,11 +15,11 @@ import {
   UpdateToLatestLedgerRequest,
   RawTransaction,
   SignedTransaction,
-} from 'libra-web-net'
-import { CursorBuffer } from 'libra-web-core-utils/common/CursorBuffer'
-import PathValues from 'libra-web-core-utils/constants/PathValues'
-import { LibraTransaction, LibraTransactionFactory } from 'libra-web-transaction'
-import { Account, AccountAddress, AccountState, AccountStates } from 'libra-web-account'
+} from '../libra-web-net'
+import { CursorBuffer } from '../libra-web-core-utils/common/CursorBuffer'
+import PathValues from '../libra-web-core-utils/constants/PathValues'
+import { LibraTransaction, LibraTransactionFactory } from '../libra-web-transaction'
+import { Account, AccountAddress, AccountState, AccountStates } from '../libra-web-account'
 
 export enum LibraNetwork {
   Testnet = 'testnet',
diff --git a/packages/libra-web-transaction/index.ts b/packages/libra-web-transaction/index.ts
index 34ec357..371f711 100644
--- a/packages/libra-web-transaction/index.ts
+++ b/packages/libra-web-transaction/index.ts
@@ -1,7 +1,7 @@
 import BigNumber from 'bignumber.js'
 import { Uint64LE } from 'int64-buffer'
-import { AccountAddress } from 'libra-web-account'
-import { Program, TransactionArgument } from 'libra-web-net'
+import { AccountAddress } from '../libra-web-account'
+import { Program, TransactionArgument } from '../libra-web-net'
 
 interface LibraGasConstraint {
   maxGasAmount: BigNumber
diff --git a/packages/libra-web/index.ts b/packages/libra-web/index.ts
index 8c124c9..d0e773d 100644
--- a/packages/libra-web/index.ts
+++ b/packages/libra-web/index.ts
@@ -1,3 +1,3 @@
-export { LibraClient, LibraNetwork } from 'libra-web-core'
-export { LibraWallet, AccountAddress, Account, AccountState } from 'libra-web-account'
-export { LibraTransactionFactory } from 'libra-web-transaction'
+export { LibraClient, LibraNetwork } from '../libra-web-core'
+export { LibraWallet, AccountAddress, Account, AccountState } from '../libra-web-account'
+export { LibraTransactionFactory } from '../libra-web-transaction'
diff --git a/test/query.test.ts b/test/query.test.ts
index f199004..3394999 100644
--- a/test/query.test.ts
+++ b/test/query.test.ts
@@ -1,4 +1,4 @@
-import { LibraClient, LibraWallet } from 'libra-web'
+import { LibraClient, LibraWallet } from '../packages/libra-web'
 
 describe('LibraClient.query*()', () => {
   describe('queryBalance()', () => {
diff --git a/test/wallet.test.ts b/test/wallet.test.ts
index 2b31b5d..4ec9754 100644
--- a/test/wallet.test.ts
+++ b/test/wallet.test.ts
@@ -1,4 +1,4 @@
-import { Mnemonic } from 'libra-web-account'
+import { Mnemonic } from '../packages/libra-web-account'
 
 describe('LibraWallet', () => {
   describe('generateMnemonic()', () => {
diff --git a/tsconfig.json b/tsconfig.json
index a8b28fa..11b1b55 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,8 +7,7 @@
 
     "strict": true,
 
-    "moduleResolution": "node",
-    "baseUrl": "./packages",
+    "baseUrl": ".",
     "esModuleInterop": true
   },
   "include": ["packages/**/*", "packages/libra-web-net/__grpc_web_generated__/*", "test/**/*"],
diff --git a/yarn.lock b/yarn.lock
index 1b25088..d723cb2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -946,11 +946,25 @@ bcrypt-pbkdf@^1.0.0:
   dependencies:
     tweetnacl "^0.14.3"
 
+bigint-buffer@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/bigint-buffer/-/bigint-buffer-1.1.2.tgz#b7edfaf3a88d0767aed7edc671d6bae4b1021575"
+  integrity sha512-gof9NgbodUgCXD2aUHfUKk5KUDk6/zPlwE+YYpRM2t7zS0K/6WipJFWfziIY+EavxFDuGUnuuQQzzvNcckPKNA==
+  dependencies:
+    bindings "^1.3.0"
+
 bignumber.js@^9.0.0:
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-9.0.0.tgz#805880f84a329b5eac6e7cb6f8274b6d82bdf075"
   integrity sha512-t/OYhhJ2SD+YGBQcjY8GzzDHEk9f3nerxjtfa6tlMXfe7frs/WozhvCNoGvpM0P3bNf3Gq5ZRMlGr5f3r4/N8A==
 
+bindings@^1.3.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.5.0.tgz#10353c9e945334bc0511a6d90b38fbc7c9c504df"
+  integrity sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==
+  dependencies:
+    file-uri-to-path "1.0.0"
+
 bip39@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/bip39/-/bip39-3.0.2.tgz#2baf42ff3071fc9ddd5103de92e8f80d9257ee32"
@@ -1100,7 +1114,7 @@ ci-info@^2.0.0:
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
   integrity sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==
 
-cipher-base@^1.0.1, cipher-base@^1.0.3, cipher-base@^1.0.4:
+cipher-base@^1.0.1, cipher-base@^1.0.3:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/cipher-base/-/cipher-base-1.0.4.tgz#8760e4ecc272f4c363532f926d874aae2c1397de"
   integrity sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==
@@ -1625,6 +1639,11 @@ fb-watchman@^2.0.0:
   dependencies:
     bser "^2.0.0"
 
+file-uri-to-path@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz#553a7b8446ff6f684359c445f1e37a05dacc33dd"
+  integrity sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==
+
 fill-range@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-4.0.0.tgz#d544811d428f98eb06a63dc402d2403c328c38f7"
@@ -2073,7 +2092,7 @@ info-symbol@^0.1.0:
   resolved "https://registry.yarnpkg.com/info-symbol/-/info-symbol-0.1.0.tgz#27841d72867ddb4242cd612d79c10633881c6a78"
   integrity sha1-J4QdcoZ920JCzWEtecEGM4gcang=
 
-inherits@2, inherits@^2.0.1, inherits@^2.0.3, inherits@^2.0.4, inherits@~2.0.3:
+inherits@2, inherits@^2.0.1, inherits@^2.0.3, inherits@~2.0.3:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
   integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==