diff --git a/buf.gen.yaml b/buf.gen.yaml
index 1926b9b6..ef1e78bf 100644
--- a/buf.gen.yaml
+++ b/buf.gen.yaml
@@ -1,4 +1,6 @@
 version: v2
+managed:
+  enabled: true
 plugins:
   - local: ./node_modules/ts-proto/protoc-gen-ts_proto
     strategy: directory
@@ -6,8 +8,3 @@ plugins:
     opt:
       - esModuleInterop=true
       - fileSuffix=_pb
-inputs:
-  - directory: ./packages
-    exclude_paths:
-      - packages/network/node_modules
-      - packages/object/node_modules
diff --git a/buf.lock b/buf.lock
new file mode 100644
index 00000000..4f98143f
--- /dev/null
+++ b/buf.lock
@@ -0,0 +1,2 @@
+# Generated by buf. DO NOT EDIT.
+version: v2
diff --git a/buf.yaml b/buf.yaml
new file mode 100644
index 00000000..bb492421
--- /dev/null
+++ b/buf.yaml
@@ -0,0 +1,14 @@
+version: v2
+modules:
+  - path: packages
+  - includes:
+      - packages/network
+      - packages/object
+  - excludes:
+      - node_modules
+      - packages/network/node_modules
+      - packages/object/node_modules
+      - examples/canvas/node_modules
+      - examples/chat/node_modules
+deps:
+  - buf.build/googleapis/googleapis
diff --git a/packages/node/package.json b/packages/node/package.json
index 0573c956..062dc5c7 100644
--- a/packages/node/package.json
+++ b/packages/node/package.json
@@ -41,6 +41,7 @@
   "@topology-foundation/network": "0.2.0",
   "@topology-foundation/object": "0.2.0",
   "commander": "^12.1.0",
+  "google-protobuf": "^3.21.2",
   "it-length-prefixed": "^9.1.0"
  }
 }
diff --git a/packages/node/src/proto/rpc.proto b/packages/node/src/proto/rpc.proto
new file mode 100644
index 00000000..a3ba5406
--- /dev/null
+++ b/packages/node/src/proto/rpc.proto
@@ -0,0 +1,43 @@
+syntax = "proto3";
+package topology.rpc;
+import "google/api/http.proto";
+import "google/api/annotations.proto";
+
+service Rpc {
+	rpc subscribeCro    (SubscribeCroRequest    ) returns (SubscribeCroResponse    ) {
+		option (google.api.http).get = "/topopology/cro/subscribe/{cro_id}";
+	};
+	rpc unsubscribeCro  (UnsubscribeCroRequest  ) returns (UnsubscribeCroRequest   ) {
+		option (google.api.http).get = "/topopology/cro/subscribe/{cro_id}";
+	};
+	rpc getCroHashGraph (GetCroHashGraphRequest ) returns (GetCroHashGraphResponse ) {
+		option (google.api.http).get = "/topopology/cro/subscribe/{cro_id}";
+	};
+}
+
+message SubscribeCroRequest {
+	string cro_id = 1;
+}
+
+message SubscribeCroResponse {
+	// can return error codes if different than 0
+	int return_code = 1;
+}
+
+message UnsubscribeCroRequest {
+	string cro_id = 1;
+}
+
+message UnsubscribeCroResponse {
+	// can return error codes if different than 0
+	int return_code = 1;
+}
+
+message getCroHashGraphRequest {
+	string cro_id = 1;
+}
+
+message getCroHashGraphResponse {
+	// linearized vertices hashes
+	repeated string vertices_hashes = 1;
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d224d9a7..e8ae290c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -45,16 +45,16 @@ importers:
   examples/canvas:
     dependencies:
       '@topology-foundation/blueprints':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/blueprints
       '@topology-foundation/network':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/network
       '@topology-foundation/node':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/node
       '@topology-foundation/object':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/object
       crypto-browserify:
         specifier: ^3.12.0
@@ -91,16 +91,16 @@ importers:
   examples/chat:
     dependencies:
       '@topology-foundation/blueprints':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/blueprints
       '@topology-foundation/network':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/network
       '@topology-foundation/node':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/node
       '@topology-foundation/object':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/object
       assemblyscript:
         specifier: ^0.27.29
@@ -146,13 +146,13 @@ importers:
   examples/grid:
     dependencies:
       '@topology-foundation/network':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/network
       '@topology-foundation/node':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/node
       '@topology-foundation/object':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../../packages/object
       assemblyscript:
         specifier: ^0.27.29
@@ -205,7 +205,7 @@ importers:
         version: 4.0.3
     devDependencies:
       '@topology-foundation/object':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../object
       assemblyscript:
         specifier: ^0.27.29
@@ -305,17 +305,20 @@ importers:
         specifier: ^1.7.0
         version: 1.7.0
       '@topology-foundation/blueprints':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../blueprints
       '@topology-foundation/network':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../network
       '@topology-foundation/object':
-        specifier: 0.1.1
+        specifier: 0.2.0
         version: link:../object
       commander:
         specifier: ^12.1.0
         version: 12.1.0
+      google-protobuf:
+        specifier: ^3.21.2
+        version: 3.21.4
       it-length-prefixed:
         specifier: ^9.1.0
         version: 9.1.0
@@ -3216,6 +3219,9 @@ packages:
   globrex@0.1.2:
     resolution: {integrity: sha512-uHJgbwAMwNFf5mLst7IWLNg14x1CkeqglJb/K3doi4dw6q2IvAAmM/Y81kevy83wP+Sst+nutFTYOGg3d1lsxg==}
 
+  google-protobuf@3.21.4:
+    resolution: {integrity: sha512-MnG7N936zcKTco4Jd2PX2U96Kf9PxygAPKBug+74LHzmHXmceN16MmRcdgZv+DGef/S9YvQAfRsNCn4cjf9yyQ==}
+
   gopd@1.0.1:
     resolution: {integrity: sha512-d65bNlIadxvpb/A2abVdlqKqV563juRnZ1Wtk6s1sIR8uNsXR70xqIzVqxVf1eTqDunwT2MkczEeaezCKTZhwA==}
 
@@ -9130,6 +9136,8 @@ snapshots:
 
   globrex@0.1.2: {}
 
+  google-protobuf@3.21.4: {}
+
   gopd@1.0.1:
     dependencies:
       get-intrinsic: 1.2.4