diff --git a/package-lock.json b/package-lock.json
index f3abf43..0196ada 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -119,6 +119,22 @@
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+        }
+      }
+    },
     "webpack-cli": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.1.2.tgz",
       "integrity": "sha512-Cnqo7CeqeSvC6PTdts+dywNi5CRlIPbLx1AoUPK2T6vC1YAugMG3IOoO9DmEscd+Dghw7uRlnzV1KwOe5IrtgQ==",
-      "dev": true,
       "requires": {
         "chalk": "^2.4.1",
         "cross-spawn": "^6.0.5",
@@ -7962,6 +8174,19 @@
         "yargs": "^12.0.2"
       }
     },
+    "webpack-concat-plugin": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/webpack-concat-plugin/-/webpack-concat-plugin-3.0.0.tgz",
+      "integrity": "sha512-DLdDbZXyrFR99wyAVC9P06HLjr2XujBmQdSbnQMK2o01H9U2NHsN5W76jeTVeXDq5OLvZf8r/se65ftRo3Prow==",
+      "dev": true,
+      "requires": {
+        "concat-with-sourcemaps": "^1.0.5",
+        "globby": "^8.0.1",
+        "schema-utils": "^0.4.5",
+        "uglify-es": "^3.3.9",
+        "upath": "^1.1.0"
+      }
+    },
     "webpack-merge": {
       "version": "4.1.5",
       "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.1.5.tgz",
@@ -7975,7 +8200,6 @@
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.3.0.tgz",
       "integrity": "sha512-OiVgSrbGu7NEnEvQJJgdSFPl2qWKkWq5lHMhgiToIiN9w34EBnjYzSYs+VbL5KoYiLNtFFa7BZIKxRED3I32pA==",
-      "dev": true,
       "requires": {
         "source-list-map": "^2.0.0",
         "source-map": "~0.6.1"
@@ -7984,33 +8208,7 @@
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
-    "websocket": {
-      "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
-      "from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
-      "requires": {
-        "debug": "^2.2.0",
-        "nan": "^2.3.3",
-        "typedarray-to-buffer": "^3.1.2",
-        "yaeti": "^0.0.6"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-          "requires": {
-            "ms": "2.0.0"
-          }
-        },
-        "ms": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
         }
       }
     },
@@ -8028,7 +8226,6 @@
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
-      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -8036,8 +8233,7 @@
     "which-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
     },
     "wordwrap": {
       "version": "0.0.3",
@@ -8049,16 +8245,14 @@
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.6.0.tgz",
       "integrity": "sha512-6w+3tHbM87WnSWnENBUvA2pxJPLhQUg5LKwUQHq3r+XPhIM+Gh2R5ycbwPCyuGbNg+lPgdcnQUhuC02kJCvffQ==",
-      "dev": true,
       "requires": {
         "errno": "~0.1.7"
       }
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
-      "dev": true,
       "requires": {
         "string-width": "^1.0.1",
         "strip-ansi": "^3.0.1"
@@ -8067,14 +8261,12 @@
         "ansi-regex": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-          "dev": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -8083,7 +8275,6 @@
           "version": "1.0.2",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-          "dev": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -8094,7 +8285,6 @@
           "version": "3.0.1",
           "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "dev": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -8107,13 +8297,11 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "ws": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
-      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.2.tgz",
+      "integrity": "sha512-rfUqzvz0WxmSXtJpPMX2EeASXabOrSMk1ruMOV3JBTBjo4ac2lDjGGsbQSyxj8Odhw5fBib8ZKEjDNvgouNKYw==",
       "requires": {
-        "async-limiter": "~1.0.0",
-        "safe-buffer": "~5.1.0",
-        "ultron": "~1.1.0"
+        "async-limiter": "~1.0.0"
       }
     },
     "xhr": {
@@ -8170,8 +8358,7 @@
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-      "dev": true
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
     },
     "yaeti": {
       "version": "0.0.6",
@@ -8181,14 +8368,12 @@
     "yallist": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
-      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
-      "dev": true
+      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A=="
     },
     "yargs": {
       "version": "12.0.5",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
       "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
-      "dev": true,
       "requires": {
         "cliui": "^4.0.0",
         "decamelize": "^1.2.0",
@@ -8208,7 +8393,6 @@
       "version": "11.1.1",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
       "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-      "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
diff --git a/package.json b/package.json
index 72ee2fa..3051a42 100644
--- a/package.json
+++ b/package.json
@@ -71,6 +71,7 @@
     "cross-env": "^5.2.0",
     "mocha": "^5.2.0",
     "nyc": "^13.1.0",
+    "rollup": "^1.0.0",
     "source-map-support": "^0.5.9",
     "truffle-hdwallet-provider": "^1.0.0",
     "ts-node": "^7.0.1",
diff --git a/test/ocean/ServiceAgreement.test.ts b/test/ocean/ServiceAgreement.test.ts
index 715b874..3cec4eb 100644
--- a/test/ocean/ServiceAgreement.test.ts
+++ b/test/ocean/ServiceAgreement.test.ts
@@ -96,6 +96,21 @@ describe("ServiceAgreement", () => {
             assert(serviceDefinitionId)
             assert(serviceDefinitionId !== did.getId())
         })
+
+        it("should throw on invalid sig", (done) => {
+
+            const ddo = new DDO({id: did.getDid(), service: [accessService]})
+            const serviceAgreementId: string = IdGenerator.generateId()
+
+            // @ts-ignore
+            WebServiceConnectorProvider.setConnector(new WebServiceConnectorMock(ddo))
+
+            ServiceAgreement.executeServiceAgreement(did, ddo, accessService.serviceDefinitionId,
+                serviceAgreementId, "0x00", consumerAccount, publisherAccount)
+                .catch((err) => {
+                    done()
+                })
+        })
     })
 
     describe("#getStatus()", () => {