diff --git a/lib/bitcoin/MongoDbBlockMetadataStore.ts b/lib/bitcoin/MongoDbBlockMetadataStore.ts
index ae8623088..b4441993e 100644
--- a/lib/bitcoin/MongoDbBlockMetadataStore.ts
+++ b/lib/bitcoin/MongoDbBlockMetadataStore.ts
@@ -66,7 +66,7 @@ export default class MongoDbBlockMetadataStore extends MongoDbStore implements I
   }
 
   public async getLast (): Promise<BlockMetadata | undefined> {
-    const blocks = await this.collection!.find<BlockMetadata>().sort({ height: -1 }).limit(1).toArray();
+    const blocks = await this.collection!.find().sort({ height: -1 }).limit(1).toArray();
     if (blocks.length === 0) {
       return undefined;
     }
@@ -79,7 +79,7 @@ export default class MongoDbBlockMetadataStore extends MongoDbStore implements I
    * Gets the first block (block with lowest height).
    */
   private async getFirst (): Promise<BlockMetadata | undefined> {
-    const blocks = await this.collection!.find<BlockMetadata>().sort({ height: 1 }).limit(1).toArray();
+    const blocks = await this.collection!.find().sort({ height: 1 }).limit(1).toArray();
     if (blocks.length === 0) {
       return undefined;
     }
diff --git a/lib/common/MongoDbServiceStateStore.ts b/lib/common/MongoDbServiceStateStore.ts
index c72d2b2db..598150381 100644
--- a/lib/common/MongoDbServiceStateStore.ts
+++ b/lib/common/MongoDbServiceStateStore.ts
@@ -21,7 +21,7 @@ export default class MongoDbServiceStateStore<T> extends MongoDbStore implements
 
   public async get (): Promise<T | undefined> {
     const queryOptions = { fields: { _id: 0 } }; // Exclude `_id` field from being returned.
-    const serviceState = await this.collection!.findOne<T>({ }, queryOptions); //
+    const serviceState = await this.collection!.findOne({ }, queryOptions);
 
     if (serviceState === null) {
       return undefined;
diff --git a/package-lock.json b/package-lock.json
index bd7b1ad6f..86ea3c6ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -952,9 +952,9 @@
       }
     },
     "@types/bson": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/@types/bson/-/bson-4.0.2.tgz",
-      "integrity": "sha512-+uWmsejEHfmSjyyM/LkrP0orfE2m5Mx9Xel4tXNeqi1ldK5XMQcDsFkBmLDtuyKUbxj2jGDo0H240fbCRJZo7Q==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/@types/bson/-/bson-4.0.3.tgz",
+      "integrity": "sha512-mVRvYnTOZJz3ccpxhr3wgxVmSeiYinW+zlzQz3SXWaJmD1DuL05Jeq7nKw3SnbKmbleW5qrLG5vdyWe/A9sXhw==",
       "dev": true,
       "requires": {
         "@types/node": "*"
@@ -996,9 +996,9 @@
       "dev": true
     },
     "@types/mongodb": {
-      "version": "3.5.25",
-      "resolved": "https://registry.npmjs.org/@types/mongodb/-/mongodb-3.5.25.tgz",
-      "integrity": "sha512-2H/Owt+pHCl9YmBOYnXc3VdnxejJEjVdH+QCWL5ZAfPehEn3evygKBX3/vKRv7aTwfNbUd0E5vjJdQklH/9a6w==",
+      "version": "3.6.9",
+      "resolved": "https://registry.npmjs.org/@types/mongodb/-/mongodb-3.6.9.tgz",
+      "integrity": "sha512-2XSGr/+IOKeFQ5tU9ATcIiIr7bpHqWyOXNGLOOhp0kg2NnfEvoKZF1SZ25j4zvJRqM2WeSUjfWSvymFJ3HBGJQ==",
       "dev": true,
       "requires": {
         "@types/bson": "*",
@@ -1008,7 +1008,7 @@
     "@types/node": {
       "version": "11.13.4",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-11.13.4.tgz",
-      "integrity": "sha1-+D7Dw+BbF0tyQfretmiCZ/5bIso=",
+      "integrity": "sha512-+rabAZZ3Yn7tF/XPGHupKIL5EcAbrLxnTr/hgQICxbeuAfWtT0UZSfULE+ndusckBItcv4o6ZeOJplQikVcLvQ==",
       "dev": true
     },
     "@types/node-fetch": {
@@ -1035,7 +1035,7 @@
     "@types/retry": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
-      "integrity": "sha1-KzXsz87n04zXKtmSMvvVi/+zyE0=",
+      "integrity": "sha512-wWKOClTTiizcZhXnPY4wikVAwmdYHp8q6DmC+EJUzAMsycb7HB32Kh9RN4+0gExjmPmZSAQjgURXIGATPegAvA==",
       "dev": true
     },
     "@types/time-span": {
@@ -1443,7 +1443,7 @@
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       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
-      "integrity": "sha1-vNZ5HqWuCXJeF+WtmIE0zUCz2RE=",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "dev": true,
       "requires": {
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@@ -1839,7 +1839,7 @@
     "base64url": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/base64url/-/base64url-3.0.1.tgz",
-      "integrity": "sha1-Y5nVcuK8P5CpqLItXbsKMtM/eI0="
+      "integrity": "sha512-ir1UPr3dkwexU7FdV8qBBbNDRUhMmIekYMFZfi+C/sLNnRESKPl23nB9b2pltqfOQNnGzsDdId90AEtG5tCx4A=="
     },
     "batch": {
       "version": "0.6.1",
@@ -1850,7 +1850,7 @@
     "bech32": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/bech32/-/bech32-1.1.3.tgz",
-      "integrity": "sha1-vUeomGu7Puw0pWoJeoS40+mi380="
+      "integrity": "sha512-yuVFUvrNcoJi0sv5phmqc6P+Fl1HjRDRNOOkHY2X/3LBy2bIGNSFx4fZ95HMaXHupuS7cZR15AsvtmCIF4UEyg=="
     },
     "beeper": {
       "version": "1.1.1",
@@ -1900,6 +1900,31 @@
         }
       }
     },
+    "bl": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-2.2.1.tgz",
+      "integrity": "sha512-6Pesp1w0DEX1N550i/uGV/TqucVL4AM/pgThFSN/Qq9si1/DF9aIHs1BxD8V/QU0HoeHO6cQRTAuYnLPKq1e4g==",
+      "requires": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "2.3.7",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        }
+      }
+    },
     "bn.js": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
@@ -1920,7 +1945,7 @@
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha1-PH/L9SnYcibz0vUrlm/1Jx60Qd0=",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
@@ -1950,9 +1975,9 @@
       }
     },
     "bson": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.1.tgz",
-      "integrity": "sha512-jCGVYLoYMHDkOsbwJZBCqwMHyH4c+wzgI9hG7Z6SZJRXWr+x58pdIbm2i9a/jFGCkRJqRUr8eoI7lDWa0hTkxg=="
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.5.tgz",
+      "integrity": "sha512-kDuEzldR21lHciPQAIulLs1LZlCXdLziXI6Mb/TDkwXhb//UORJNPXgcRs2CuO4H0DcMkpfT3/ySsP3unoZjBg=="
     },
     "buffer-compare": {
       "version": "1.1.1",
@@ -1968,7 +1993,7 @@
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
-      "integrity": "sha1-MnE7wCj3XAL9txDXx7zsHyxgcO8=",
+      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
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@@ -4201,8 +4226,7 @@
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-      "dev": true
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
     "cosmiconfig": {
       "version": "5.2.0",
@@ -4219,7 +4243,7 @@
     "cross-spawn": {
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
-      "integrity": "sha1-Sl7Hxk364iw6FBJNus3uhG2Ay8Q=",
+      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
       "dev": true,
       "requires": {
         "nice-try": "^1.0.4",
@@ -4331,7 +4355,7 @@
     "debug": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
-      "integrity": "sha1-O3ImAlUQnGtYnO4FDx1RYTlmR5E=",
+      "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
       "dev": true,
       "requires": {
         "ms": "^2.1.1"
@@ -4475,6 +4499,11 @@
       "dev": true,
       "optional": true
     },
+    "denque": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/denque/-/denque-1.5.0.tgz",
+      "integrity": "sha512-CYiCSgIF1p6EUByQPlGkKnP1M9g0ZV3qMIrqMqZqdwazygIA/YP2vrbcyl1h/WppKJTdl1F85cXIle+394iDAQ=="
+    },
     "depd": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -4628,17 +4657,29 @@
       "dev": true
     },
     "elliptic": {
-      "version": "6.5.3",
-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
-      "integrity": "sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==",
+      "version": "6.5.4",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
       "requires": {
-        "bn.js": "^4.4.0",
-        "brorand": "^1.0.1",
+        "bn.js": "^4.11.9",
+        "brorand": "^1.1.0",
         "hash.js": "^1.0.0",
-        "hmac-drbg": "^1.0.0",
-        "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0",
-        "minimalistic-crypto-utils": "^1.0.0"
+        "hmac-drbg": "^1.0.1",
+        "inherits": "^2.0.4",
+        "minimalistic-assert": "^1.0.1",
+        "minimalistic-crypto-utils": "^1.0.1"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA=="
+        },
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
+        }
       }
     },
     "emoji-regex": {
@@ -4703,7 +4744,7 @@
     "error-ex": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
-      "integrity": "sha1-tKxAZIEH/c3PriQvQovqihTU8b8=",
+      "integrity": "sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==",
       "dev": true,
       "requires": {
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@@ -5408,7 +5449,7 @@
     "esprima": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
-      "integrity": "sha1-E7BM2z5sXRnfkatph6hpVhmwqnE=",
+      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
       "dev": true
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@@ -5466,7 +5507,7 @@
     "execa": {
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       "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
-      "integrity": "sha1-xiNqW7TfbW8V6I5/AXeYIWdJ3dg=",
+      "integrity": "sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==",
       "dev": true,
       "requires": {
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@@ -6326,13 +6367,13 @@
     "get-stdin": {
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       "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-6.0.0.tgz",
-      "integrity": "sha1-ngm/cSs2CrkiXoEgSPcf3pyJZXs=",
+      "integrity": "sha512-jp4tHawyV7+fkkSKyvjuLZswblUtz+SQKzSWnBbii16BuZksJlU1wuBYXY75r+duh/llF1ur6oNwi+2ZzjKZ7g==",
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       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
-      "integrity": "sha1-wbJVV189wh1Zv8ec09K0axw6VLU=",
+      "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
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       "requires": {
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@@ -6692,7 +6733,7 @@
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       "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
-      "integrity": "sha1-q4eVM4hooLq9hSV1gBjCp+uVxC4=",
+      "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==",
       "dev": true
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@@ -7297,7 +7338,7 @@
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       "resolved": "https://registry.npmjs.org/hash.js/-/hash.js-1.1.7.tgz",
-      "integrity": "sha1-C6vKU46NTuSg+JiNaIZlN6ADz0I=",
+      "integrity": "sha512-taOaskGt4z4SOANNseOviYDvjEJinIkRgmp7LbKP2YTTmVxWBl87s/uzK9r+44BclBSp2X7K1hqeNfz9JbBeXA==",
       "requires": {
         "inherits": "^2.0.3",
         "minimalistic-assert": "^1.0.1"
@@ -7373,7 +7414,7 @@
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       "resolved": "https://registry.npmjs.org/http-status/-/http-status-1.3.2.tgz",
-      "integrity": "sha1-pPsn214ylI/s0vsRC5s6/vSge/c="
+      "integrity": "sha512-vR1YTaDyi2BukI0UiH01xy92oiZi4in7r0dmSPnrZg72Vu1SzyOLalwWP5NUk1rNiB2L+XVK2lcSVOqaertX8A=="
     },
     "husky": {
       "version": "1.3.1",
@@ -7840,8 +7881,7 @@
     "isarray": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
-      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-      "dev": true
+      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
     },
     "isexe": {
       "version": "2.0.0",
@@ -8209,13 +8249,13 @@
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
-      "integrity": "sha1-GSA/tZmR35jjoocFDUZHzerzJJk=",
+      "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
       "dev": true
     },
     "js-yaml": {
       "version": "3.13.1",
       "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.13.1.tgz",
-      "integrity": "sha1-r/FRswv9+o5J4F2iLnQV6d+jeEc=",
+      "integrity": "sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==",
       "dev": true,
       "requires": {
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@@ -8225,13 +8265,13 @@
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       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
-      "integrity": "sha1-gFZNLkg9rPbo7yCWUKZ98/DCg6Q=",
+      "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
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-      "integrity": "sha1-u4Z8+zRQ5pEHwTHRxRS6s9yLyqk=",
+      "integrity": "sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==",
       "dev": true
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@@ -8970,7 +9010,7 @@
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-      "integrity": "sha1-2HUWVdItOEaCdByXLyw9bfo+ZrU=",
+      "integrity": "sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg==",
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@@ -9165,7 +9205,7 @@
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-      "integrity": "sha1-LhlN4ERibUoQ5/f7wAznPoPk1cc="
+      "integrity": "sha512-UtJcAD4yEaGtjPezWuO9wC4nwUnVH/8/Im3yEHQP4b67cXlD/Qr9hdITCU1xDbSEXg2XKNaP8jsReV7vQd00/A=="
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     "minimalistic-crypto-utils": {
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@@ -9175,7 +9215,7 @@
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@@ -12110,7 +12141,7 @@
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@@ -12378,7 +12408,7 @@
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diff --git a/package.json b/package.json
index 5268432df..74a645a64 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
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