diff --git a/Subscriber_Contract_Example/package-lock.json b/Subscriber_Contract_Example/package-lock.json
index b7e58aa..fed0843 100644
--- a/Subscriber_Contract_Example/package-lock.json
+++ b/Subscriber_Contract_Example/package-lock.json
@@ -4,6 +4,121 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+        "@protobufjs/base64": "^1.1.2",
+        "@protobufjs/codegen": "^2.0.4",
+        "@protobufjs/eventemitter": "^1.1.0",
+        "@protobufjs/fetch": "^1.1.0",
+        "@protobufjs/float": "^1.0.2",
+        "@protobufjs/inquire": "^1.1.0",
+        "@protobufjs/path": "^1.1.2",
+        "@protobufjs/pool": "^1.1.0",
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+        "@types/long": "^4.0.0",
+        "@types/node": "^10.1.0",
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+          "optional": true
+        }
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+      "resolved": "https://registry.npmjs.org/@apollo/utils.dropunuseddefinitions/-/utils.dropunuseddefinitions-1.1.0.tgz",
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+      "resolved": "https://registry.npmjs.org/@apollo/utils.keyvaluecache/-/utils.keyvaluecache-1.0.1.tgz",
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+      "optional": true,
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+      "optional": true,
+      "requires": {
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+        "@apollo/utils.printwithreducedwhitespace": "^1.1.0",
+        "@apollo/utils.removealiases": "1.0.0",
+        "@apollo/utils.sortast": "^1.1.0",
+        "@apollo/utils.stripsensitiveliterals": "^1.2.0",
+        "apollo-reporting-protobuf": "^3.3.1"
+      }
+    },
+    "@apollographql/apollo-tools": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@apollographql/apollo-tools/-/apollo-tools-0.5.4.tgz",
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+      "optional": true
+    },
+    "@apollographql/graphql-playground-html": {
+      "version": "1.6.29",
+      "resolved": "https://registry.npmjs.org/@apollographql/graphql-playground-html/-/graphql-playground-html-1.6.29.tgz",
+      "integrity": "sha512-xCcXpoz52rI4ksJSdOCxeOCn2DLocxwHf9dVT/Q90Pte1LX+LY+91SFtJF3KXVHH8kEin+g1KKCQPKBjZJfWNA==",
+      "optional": true,
+      "requires": {
+        "xss": "^1.0.8"
+      }
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     "@babel/helper-module-imports": {
       "version": "7.12.5",
       "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.12.5.tgz",
@@ -57,6 +172,78 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@ethereumjs/common": {
+      "version": "2.6.5",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.6.5.tgz",
+      "integrity": "sha512-lRyVQOeCDaIVtgfbowla32pzeDv2Obr8oR8Put5RdUBNRGr1VGPGQNGP6elWIpgK3YdpzqTOh4GyUGOureVeeA==",
+      "requires": {
+        "crc-32": "^1.2.0",
+        "ethereumjs-util": "^7.1.5"
+      },
+      "dependencies": {
+        "@types/bn.js": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.1.tgz",
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+          "requires": {
+            "@types/node": "*"
+          }
+        },
+        "bn.js": {
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+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
+          "integrity": "sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ=="
+        },
+        "ethereumjs-util": {
+          "version": "7.1.5",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.5.tgz",
+          "integrity": "sha512-SDl5kKrQAudFBUe5OJM9Ac6WmMyYmXX/6sTmLZ3ffG2eY6ZIGBes3pEDxNN6V72WyOw4CPD5RomKdsa8DAAwLg==",
+          "requires": {
+            "@types/bn.js": "^5.1.0",
+            "bn.js": "^5.1.2",
+            "create-hash": "^1.1.2",
+            "ethereum-cryptography": "^0.1.3",
+            "rlp": "^2.2.4"
+          }
+        }
+      }
+    },
+    "@ethereumjs/tx": {
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.5.2.tgz",
+      "integrity": "sha512-gQDNJWKrSDGu2w7w0PzVXVBNMzb7wwdDOmOqczmhNjqFxFuIbhVJDwiGEnxFNC2/b8ifcZzY7MLcluizohRzNw==",
+      "requires": {
+        "@ethereumjs/common": "^2.6.4",
+        "ethereumjs-util": "^7.1.5"
+      },
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.1.tgz",
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+          "requires": {
+            "@types/node": "*"
+          }
+        },
+        "bn.js": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
+          "integrity": "sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ=="
+        },
+        "ethereumjs-util": {
+          "version": "7.1.5",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.5.tgz",
+          "integrity": "sha512-SDl5kKrQAudFBUe5OJM9Ac6WmMyYmXX/6sTmLZ3ffG2eY6ZIGBes3pEDxNN6V72WyOw4CPD5RomKdsa8DAAwLg==",
+          "requires": {
+            "@types/bn.js": "^5.1.0",
+            "bn.js": "^5.1.2",
+            "create-hash": "^1.1.2",
+            "ethereum-cryptography": "^0.1.3",
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+      }
+    },
     "@ethersproject/abi": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.0.7.tgz",
@@ -248,728 +435,1362 @@
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       }
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+      "optional": true,
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-        "strip-ansi": {
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diff --git a/Subscriber_Contract_Example/package.json b/Subscriber_Contract_Example/package.json
index c0cbf10..5f4f1fd 100644
--- a/Subscriber_Contract_Example/package.json
+++ b/Subscriber_Contract_Example/package.json
@@ -22,7 +22,7 @@
     "@zapjs/zaptoken": "^3.0.1",
     "dotenv": "^8.2.0",
     "pify": "^5.0.0",
-    "truffle": "^5.1.59",
+    "truffle": "^5.6.5",
     "web3": "^1.3.1",
     "web3-utils": "^1.3.1"
   }