diff --git a/package-lock.json b/package-lock.json
index 332b24e..f66be6a 100644
--- a/package-lock.json
+++ b/package-lock.json
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+      "version": "0.17.2",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.17.2.tgz",
+      "integrity": "sha512-UJYB6wFSJE3G00nEivR5rgWp8c2xXvJ3OPWPhmuteU0IKj8nKbG3DrjiOmLwpnHGYWAVwA69zmTm++YG0Hmwww==",
       "requires": {
         "debug": "2.6.9",
         "depd": "~1.1.2",
@@ -2386,18 +2403,18 @@
         "escape-html": "~1.0.3",
         "etag": "~1.8.1",
         "fresh": "0.5.2",
-        "http-errors": "~1.7.2",
+        "http-errors": "1.8.1",
         "mime": "1.6.0",
-        "ms": "2.1.1",
+        "ms": "2.1.3",
         "on-finished": "~2.3.0",
         "range-parser": "~1.2.1",
         "statuses": "~1.5.0"
       },
       "dependencies": {
         "ms": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
-          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+          "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="
         }
       }
     },
@@ -2411,14 +2428,14 @@
       }
     },
     "serve-static": {
-      "version": "1.14.1",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
-      "integrity": "sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==",
+      "version": "1.14.2",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.2.tgz",
+      "integrity": "sha512-+TMNA9AFxUEGuC0z2mevogSnn9MXKb4fa7ngeRMJaaGv8vTwnIEkKi+QGvPt33HSnf8pRS+WGM0EbMtCJLKMBQ==",
       "requires": {
         "encodeurl": "~1.0.2",
         "escape-html": "~1.0.3",
         "parseurl": "~1.3.3",
-        "send": "0.17.1"
+        "send": "0.17.2"
       }
     },
     "set-blocking": {
@@ -2428,9 +2445,9 @@
       "dev": true
     },
     "setprototypeof": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
-      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw=="
     },
     "shebang-command": {
       "version": "2.0.0",
@@ -2454,13 +2471,13 @@
       "dev": true
     },
     "sinon": {
-      "version": "11.1.2",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-11.1.2.tgz",
-      "integrity": "sha512-59237HChms4kg7/sXhiRcUzdSkKuydDeTiamT/jesUVHshBgL8XAmhgFo0GfK6RruMDM/iRSij1EybmMog9cJw==",
+      "version": "12.0.1",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-12.0.1.tgz",
+      "integrity": "sha512-iGu29Xhym33ydkAT+aNQFBINakjq69kKO6ByPvTsm3yyIACfyQttRTP03aBP/I8GfhFmLzrnKwNNkr0ORb1udg==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^1.8.3",
-        "@sinonjs/fake-timers": "^7.1.2",
+        "@sinonjs/fake-timers": "^8.1.0",
         "@sinonjs/samsam": "^6.0.2",
         "diff": "^5.0.0",
         "nise": "^5.1.0",
@@ -2497,9 +2514,9 @@
       "dev": true
     },
     "source-map-support": {
-      "version": "0.5.20",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.20.tgz",
-      "integrity": "sha512-n1lZZ8Ve4ksRqizaBQgxXDgKwttHDhyfQjA6YZZn8+AroHbsIz+JjwxQDxbp+7y5OYCI8t1Yk7etjD9CRd2hIw==",
+      "version": "0.5.21",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.21.tgz",
+      "integrity": "sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==",
       "dev": true,
       "requires": {
         "buffer-from": "^1.0.0",
@@ -2585,16 +2602,16 @@
       }
     },
     "swagger-ui-dist": {
-      "version": "3.50.0",
-      "resolved": "https://registry.npmjs.org/swagger-ui-dist/-/swagger-ui-dist-3.50.0.tgz",
-      "integrity": "sha512-BklniOBPlvZ6M9oGkhUwOf5HvxhkHBIycXN3ndju8WlLmi1xfMSdOA2AR6pNswlwURzsZUe1rh80aUyjnpD+Zw=="
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/swagger-ui-dist/-/swagger-ui-dist-4.1.3.tgz",
+      "integrity": "sha512-WvfPSfAAMlE/sKS6YkW47nX/hA7StmhYnAHc6wWCXNL0oclwLj6UXv0hQCkLnDgvebi0MEV40SJJpVjKUgH1IQ=="
     },
     "swagger-ui-express": {
-      "version": "4.1.6",
-      "resolved": "https://registry.npmjs.org/swagger-ui-express/-/swagger-ui-express-4.1.6.tgz",
-      "integrity": "sha512-Xs2BGGudvDBtL7RXcYtNvHsFtP1DBFPMJFRxHe5ez/VG/rzVOEjazJOOSc/kSCyxreCTKfJrII6MJlL9a6t8vw==",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/swagger-ui-express/-/swagger-ui-express-4.3.0.tgz",
+      "integrity": "sha512-jN46SEEe9EoXa3ZgZoKgnSF6z0w3tnM1yqhO4Y+Q4iZVc8JOQB960EZpIAz6rNROrDApVDwcMHR0mhlnc/5Omw==",
       "requires": {
-        "swagger-ui-dist": "^3.18.1"
+        "swagger-ui-dist": ">=4.1.3"
       }
     },
     "test-exclude": {
@@ -2624,9 +2641,9 @@
       }
     },
     "toidentifier": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
-      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
     },
     "ts-node": {
       "version": "10.4.0",
@@ -2764,9 +2781,9 @@
       }
     },
     "typescript": {
-      "version": "4.4.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.4.4.tgz",
-      "integrity": "sha512-DqGhF5IKoBl8WNf8C1gu8q0xZSInh9j1kJJMqT3a94w1JzVaBU4EXOSMrz9yDqMT0xt3selp83fuFMQ0uzv6qA==",
+      "version": "4.5.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.5.4.tgz",
+      "integrity": "sha512-VgYs2A2QIRuGphtzFV7aQJduJ2gyfTljngLzjpfW9FoYZF6xuw1W0vW9ghCKLfcWrCFxK81CSGRAvS1pn4fIUg==",
       "dev": true
     },
     "unpipe": {
@@ -2873,9 +2890,9 @@
       }
     },
     "ws": {
-      "version": "8.2.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
-      "integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA=="
+      "version": "8.4.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.4.0.tgz",
+      "integrity": "sha512-IHVsKe2pjajSUIl4KYMQOdlyliovpEPquKkqbwswulszzI7r0SfQrxnXdWAEqOlDCLrVSJzo+O1hAwdog2sKSQ=="
     },
     "y18n": {
       "version": "5.0.8",
diff --git a/package.json b/package.json
index 2879596..4b8b4e9 100644
--- a/package.json
+++ b/package.json
@@ -20,40 +20,40 @@
   "author": "",
   "license": "Apache-2.0",
   "dependencies": {
-    "ajv": "^8.6.3",
-    "axios": "^0.23.0",
+    "ajv": "^8.8.2",
+    "axios": "^0.24.0",
     "busboy": "^0.3.1",
-    "express": "^4.17.1",
+    "express": "^4.17.2",
     "form-data": "^4.0.0",
-    "jsrsasign": "^10.4.1",
-    "swagger-ui-express": "^4.1.6",
+    "jsrsasign": "^10.5.1",
+    "swagger-ui-express": "^4.3.0",
     "uuid": "^8.3.2",
-    "ws": "^8.2.3",
+    "ws": "^8.4.0",
     "yamljs": "^0.3.0"
   },
   "devDependencies": {
-    "@types/bunyan": "^1.8.7",
+    "@types/bunyan": "^1.8.8",
     "@types/busboy": "^0.3.1",
-    "@types/chai": "^4.2.22",
+    "@types/chai": "^4.3.0",
     "@types/express": "^4.17.13",
-    "@types/jsrsasign": "^8.0.13",
+    "@types/jsrsasign": "^9.0.3",
     "@types/mocha": "^9.0.0",
-    "@types/node": "^16.11.5",
+    "@types/node": "^17.0.8",
     "@types/swagger-ui-express": "^4.1.3",
-    "@types/uuid": "^8.3.1",
-    "@types/ws": "^8.2.0",
+    "@types/uuid": "^8.3.3",
+    "@types/ws": "^8.2.2",
     "@types/yamljs": "^0.2.31",
     "chai": "^4.3.4",
     "mocha": "^9.1.3",
     "moment": "^2.29.1",
     "nyc": "^15.1.0",
     "rimraf": "^3.0.2",
-    "sinon": "^11.1.2",
+    "sinon": "^12.0.1",
     "sinon-chai": "^3.7.0",
-    "source-map-support": "^0.5.20",
+    "source-map-support": "^0.5.21",
     "ts-node": "^10.4.0",
     "ts-sinon": "^2.0.2",
-    "typescript": "^4.4.4"
+    "typescript": "^4.5.4"
   },
   "nyc": {
     "extension": [
diff --git a/src/handlers/blobs.ts b/src/handlers/blobs.ts
index 07ee645..5d2e946 100644
--- a/src/handlers/blobs.ts
+++ b/src/handlers/blobs.ts
@@ -46,11 +46,13 @@ export const storeBlob = async (file: IFile, filePath: string) => {
   const resolvedFilePath = path.join(utils.constants.DATA_DIRECTORY, utils.constants.BLOBS_SUBDIRECTORY, filePath);
   await fs.mkdir(path.parse(resolvedFilePath).dir, { recursive: true });
   let hash = crypto.createHash(utils.constants.TRANSFER_HASH_ALGORITHM);
+  let blobSize = 0;
   const writeStream = createWriteStream(resolvedFilePath);
   const blobHash = await new Promise<string>((resolve, reject) => {
     let hashCalculator = new stream.Transform({
       transform(chunk, _enc, cb) {
         hash.update(chunk);
+        blobSize += chunk.length
         cb(undefined, chunk);
       },
       flush(cb) {
@@ -63,7 +65,7 @@ export const storeBlob = async (file: IFile, filePath: string) => {
     });
     file.readableStream.pipe(hashCalculator).pipe(writeStream);
   });
-  return await upsertMetadata(filePath, blobHash);
+  return await upsertMetadata(filePath, blobHash, blobSize);
 };
 
 export const sendBlob = async (blobPath: string, recipient: string, recipientURL: string, requestID: string | undefined) => {
@@ -132,11 +134,12 @@ export const retreiveMetadata = async (filePath: string) => {
   }
 };
 
-export const upsertMetadata = async (filePath: string, hash: string) => {
+export const upsertMetadata = async (filePath: string, hash: string, size: number) => {
   const resolvedFilePath = path.join(utils.constants.DATA_DIRECTORY, utils.constants.BLOBS_SUBDIRECTORY, filePath + utils.constants.METADATA_SUFFIX);
   await fs.mkdir(path.parse(resolvedFilePath).dir, { recursive: true });
   let metadata: IMetadata = {
     hash,
+    size,
     lastUpdate: new Date().getTime()
   };
   await fs.writeFile(resolvedFilePath, JSON.stringify(metadata));
diff --git a/src/lib/interfaces.ts b/src/lib/interfaces.ts
index 497b917..66f4a63 100644
--- a/src/lib/interfaces.ts
+++ b/src/lib/interfaces.ts
@@ -73,6 +73,7 @@ export interface IBlobReceivedEvent {
   sender: string
   path: string
   hash: string
+  size: number
 }
 
 export interface IBlobDeliveredEvent {
@@ -133,5 +134,6 @@ export interface ICertData {
 
 export interface IMetadata {
   hash: string
+  size: number
   lastUpdate: number
 }
\ No newline at end of file
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index 1460a7e..58f3eef 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -43,6 +43,7 @@ export const constants = {
   REST_API_CALL_BLOB_REQUEST_TIMEOUT: 60000,
   MAX_EVENT_QUEUE_SIZE: 1000,
   HASH_HEADER_NAME: 'dx-hash',
+  SIZE_HEADER_NAME: 'dx-size',
   LAST_UPDATE_HEADER_NAME: 'dx-last-update'
 };
 const log = new Logger('utils.ts');
diff --git a/src/routers/api.ts b/src/routers/api.ts
index 2e8e880..fd22b2b 100644
--- a/src/routers/api.ts
+++ b/src/routers/api.ts
@@ -157,6 +157,7 @@ router.head('/blobs/*', async (req: Request, res, next) => {
     }
     const metadata = await blobsHandler.retreiveMetadata(blobPath);
     res.setHeader(utils.constants.HASH_HEADER_NAME, metadata.hash);
+    res.setHeader(utils.constants.SIZE_HEADER_NAME, metadata.size);
     res.setHeader(utils.constants.LAST_UPDATE_HEADER_NAME, metadata.lastUpdate);
     res.status(204).send();
   } catch (err) {
@@ -172,6 +173,7 @@ router.get('/blobs/*', async (req: Request, res, next) => {
     }
     const metadata = await blobsHandler.retreiveMetadata(blobPath);
     res.setHeader(utils.constants.HASH_HEADER_NAME, metadata.hash);
+    res.setHeader(utils.constants.SIZE_HEADER_NAME, metadata.size);
     res.setHeader(utils.constants.LAST_UPDATE_HEADER_NAME, metadata.lastUpdate);
     const blobStream = await blobsHandler.retreiveBlob(blobPath);
     blobStream.on('end', () => res.end());
diff --git a/src/routers/p2p.ts b/src/routers/p2p.ts
index 3ad6f8e..9ba14fe 100644
--- a/src/routers/p2p.ts
+++ b/src/routers/p2p.ts
@@ -58,6 +58,7 @@ router.put('/blobs/*', async (req: Request, res, next) => {
       sender,
       path: blobPath,
       hash: metadata.hash,
+      size: metadata.size,
       lastUpdate: metadata.lastUpdate
     } as IBlobReceivedEvent);
   } catch (err) {