diff --git a/package-lock.json b/package-lock.json
index 42ac8a0..1b0561a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "eth2air-app",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -171,6 +171,11 @@
         }
       }
     },
+    "add": {
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+      "resolved": "https://registry.npmjs.org/add/-/add-2.0.6.tgz",
+      "integrity": "sha1-JI8Kn25aUo7yKV2+7DBTITCuIjU="
+    },
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       "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.1.1.tgz",
@@ -1595,10 +1600,6 @@
       "integrity": "sha1-pfwpi4G54Nyi5FiCR4S2XFK6WI4=",
       "dev": true
     },
-    "bignumber.js": {
-      "version": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
-      "from": "git+https://github.com/debris/bignumber.js.git#master"
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@@ -3446,27 +3447,6 @@
         "xhr-request-promise": "^0.1.2"
       }
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-    "eth2air-core": {
-      "version": "git+https://github.com/VolcaTech/volca-linkdrop-core.git#dcb6f0ca99b8a70ae2210d642822426430cfdbe9",
-      "from": "git+https://github.com/VolcaTech/volca-linkdrop-core.git",
-      "requires": {
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-        "babel-plugin-transform-object-rest-spread": "^6.26.0",
-        "babel-preset-env": "^1.6.1",
-        "bluebird": "^3.5.1",
-        "ethereumjs-tx": "^1.3.3",
-        "ethereumjs-util": "^5.1.2",
-        "ethereumjs-wallet": "^0.6.0",
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-        "idempotent-babel-polyfill": "^0.1.1",
-        "querystring": "^0.2.0",
-        "solidity-sha3": "^0.4.1",
-        "uuid": "^3.2.1",
-        "web-utils": "^1.0.0",
-        "web3": "^0.20.1",
-        "web3-utils": "^1.0.0-beta.35"
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       "resolved": "https://registry.npmjs.org/ethereum-common/-/ethereum-common-0.0.18.tgz",
@@ -4100,7 +4080,8 @@
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-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "optional": true
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@@ -4121,12 +4102,14 @@
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-          "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
+          "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+          "optional": true
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+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
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@@ -4141,17 +4124,20 @@
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-          "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+          "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+          "optional": true
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           "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-          "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
+          "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+          "optional": true
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-          "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
+          "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
+          "optional": true
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         "core-util-is": {
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@@ -4268,7 +4254,8 @@
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           "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+          "optional": true
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         "ini": {
           "version": "1.3.5",
@@ -4280,6 +4267,7 @@
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           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
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@@ -4294,6 +4282,7 @@
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+          "optional": true,
           "requires": {
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@@ -4301,12 +4290,14 @@
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-          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
+          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
+          "optional": true
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         "minipass": {
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+          "optional": true,
           "requires": {
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@@ -4325,6 +4316,7 @@
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           "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
           "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+          "optional": true,
           "requires": {
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@@ -4405,7 +4397,8 @@
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-          "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
+          "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
+          "optional": true
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         "object-assign": {
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@@ -4417,6 +4410,7 @@
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           "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
           "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+          "optional": true,
           "requires": {
             "wrappy": "1"
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@@ -4502,7 +4496,8 @@
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-          "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
+          "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
+          "optional": true
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@@ -4538,6 +4533,7 @@
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           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "optional": true,
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@@ -4557,6 +4553,7 @@
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           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "optional": true,
           "requires": {
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@@ -4600,12 +4597,14 @@
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           "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+          "optional": true
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         "yallist": {
           "version": "3.0.2",
           "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz",
-          "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k="
+          "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k=",
+          "optional": true
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@@ -6282,9 +6281,9 @@
       "integrity": "sha1-G3eTz3JZ6jj7NmHU04syYK+K5Oc="
     },
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-      "version": "4.17.10",
-      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.10.tgz",
-      "integrity": "sha1-Ys1xBM313YfyNag38O3g6OURfgU="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw=="
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     "lodash._arraycopy": {
       "version": "3.0.0",
@@ -9337,6 +9336,10 @@
         "web3": "^0.16.0"
       },
       "dependencies": {
+        "bignumber.js": {
+          "version": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
+          "from": "git+https://github.com/debris/bignumber.js.git#master"
+        },
         "utf8": {
           "version": "2.1.2",
           "resolved": "https://registry.npmjs.org/utf8/-/utf8-2.1.2.tgz",
@@ -10199,6 +10202,26 @@
         "indexof": "0.0.1"
       }
     },
+    "volca-core": {
+      "version": "git+https://github.com/VolcaTech/volca-linkdrop-core.git#f945a5776b9cddad0d4d08a9b9d35303ba43b756",
+      "from": "git+https://github.com/VolcaTech/volca-linkdrop-core.git#thunder-referral",
+      "requires": {
+        "babel-plugin-add-module-exports": "^0.2.1",
+        "babel-plugin-transform-object-rest-spread": "^6.26.0",
+        "babel-preset-env": "^1.6.1",
+        "bluebird": "^3.5.1",
+        "ethereumjs-tx": "^1.3.3",
+        "ethereumjs-util": "^5.1.2",
+        "ethereumjs-wallet": "^0.6.0",
+        "idempotent-babel-polyfill": "^0.1.1",
+        "querystring": "^0.2.0",
+        "solidity-sha3": "^0.4.1",
+        "uuid": "^3.2.1",
+        "web-utils": "^1.0.0",
+        "web3": "^0.20.1",
+        "web3-utils": "^1.0.0-beta.35"
+      }
+    },
     "walker": {
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       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
@@ -10260,7 +10283,7 @@
       "dependencies": {
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           "version": "git+https://github.com/frozeman/bignumber.js-nolookahead.git#57692b3ecfc98bbdd6b3a516cb2353652ea49934",
-          "from": "git+https://github.com/frozeman/bignumber.js-nolookahead.git"
+          "from": "git+https://github.com/frozeman/bignumber.js-nolookahead.git#57692b3ecfc98bbdd6b3a516cb2353652ea49934"
         },
         "utf8": {
           "version": "2.1.2",
@@ -10733,6 +10756,11 @@
           "dev": true
         }
       }
+    },
+    "yarn": {
+      "version": "1.22.17",
+      "resolved": "https://registry.npmjs.org/yarn/-/yarn-1.22.17.tgz",
+      "integrity": "sha512-H0p241BXaH0UN9IeH//RT82tl5PfNraVpSpEoW+ET7lmopNC61eZ+A+IDvU8FM6Go5vx162SncDL8J1ZjRBriQ=="
     }
   }
 }