diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 264fbd47..bcd73ab0 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -1,7 +1,9 @@
 on:
-  push:
-    branches-ignore:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches:
       - "main"
+      - "experimental"
 
 name: validate-compatibility
 jobs:
@@ -13,10 +15,17 @@ jobs:
       - name: install
         run: make install
       - name: buf breaking
-        run: make buf-breaking
+        env:
+          BASE_BRANCH: ${{ github.event.pull_request.base.ref }}
+        run: |
+          echo "base_ref=${{ github.event.pull_request.base.ref }}"
+          echo "BASE_BRANCH=$BASE_BRANCH"
+          make buf-breaking
       - name: buf lint
         run: make buf-lint
       - name: build and compile test
         run: make test
       - name: run the check script
+        env:
+          BASE_BRANCH: ${{ github.event.pull_request.base.ref }}
         run: ./scripts/check-proto-compabitility.sh
diff --git a/Makefile b/Makefile
index cba0f90c..59cd45af 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ buf-build: node_modules/.bin/buf
 	./node_modules/.bin/buf build proto/
 
 buf-breaking: node_modules/.bin/buf
-	./node_modules/.bin/buf breaking proto/ --against 'https://github.com/decentraland/protocol.git#subdir=proto'
+	./node_modules/.bin/buf breaking proto/ --against 'https://github.com/decentraland/protocol.git#branch=$(or $(BASE_BRANCH),main),subdir=proto'
 
 test: buf-lint
 	bash scripts/test.sh
diff --git a/proto/decentraland/kernel/comms/rfc4/comms.proto b/proto/decentraland/kernel/comms/rfc4/comms.proto
index 83f098d3..87eac24e 100644
--- a/proto/decentraland/kernel/comms/rfc4/comms.proto
+++ b/proto/decentraland/kernel/comms/rfc4/comms.proto
@@ -59,6 +59,14 @@ message Movement {
   bool is_stunned = 15;
   
   float rotation_y = 16;
+  
+  message NetworkEntity {
+    uint32 entity_id = 1;
+    uint64 network_id = 2;
+  }
+
+  optional NetworkEntity network_entity = 17;
+  uint64 synced_timestamp = 18;
 }
 
 message MovementCompressed {
diff --git a/proto/decentraland/sdk/components/network_entity.proto b/proto/decentraland/sdk/components/network_entity.proto
new file mode 100644
index 00000000..b7aae9d1
--- /dev/null
+++ b/proto/decentraland/sdk/components/network_entity.proto
@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+package decentraland.sdk.components;
+
+import "decentraland/sdk/components/common/id.proto";
+option (common.ecs_component_id) = 1098;
+
+/**
+ * NetworkEntity marks an entity for network synchronization.
+
+ * When receiving network messages, to find which local entity they refer to,
+ * we look for an entity that has both the same networkId and entityId as the message.
+ */
+message PBNetworkEntity {
+  // The enumId or local entity ID
+  uint32 entity_id = 1;
+  
+  // - 0 for fixed entities (created with enumId at initialization)
+  // - User's address hash for dynamic entities (created at runtime)
+  uint64 network_id = 2;
+}
diff --git a/proto/decentraland/sdk/components/synced_clock.proto b/proto/decentraland/sdk/components/synced_clock.proto
new file mode 100644
index 00000000..db4cd003
--- /dev/null
+++ b/proto/decentraland/sdk/components/synced_clock.proto
@@ -0,0 +1,31 @@
+syntax = "proto3";
+
+package decentraland.sdk.components;
+
+import "decentraland/sdk/components/common/id.proto";
+option (common.ecs_component_id) = 1099;
+
+// PBTimeComponent provides synchronized time information based on NTP server data
+// This component can be used to maintain consistent time across all clients
+message PBSyncedClock {
+  // The current synchronized time (in milliseconds since epoch)
+  uint64 synced_timestamp = 1;
+
+  // The synchronization status
+  SyncStatus status = 7;
+}
+
+// Status of time synchronization
+enum SyncStatus {
+  // The component is not yet synchronized with the NTP server
+  SS_UNINITIALIZED = 0;
+
+  // The component is currently attempting to synchronize with the NTP server
+  SS_SYNCHRONIZING = 1;
+
+  // The component is successfully synchronized with the NTP server
+  SS_SYNCHRONIZED = 2;
+
+  // The component failed to synchronize with the NTP server
+  SS_ERROR = 3;
+}
diff --git a/proto/decentraland/sdk/components/tween.proto b/proto/decentraland/sdk/components/tween.proto
index 2ed6d784..8fe151c0 100644
--- a/proto/decentraland/sdk/components/tween.proto
+++ b/proto/decentraland/sdk/components/tween.proto
@@ -20,6 +20,7 @@ message PBTween {
 
   optional bool playing = 6; // default true (pause or running)
   optional float current_time = 7; // between 0 and 1
+  optional uint64 start_synced_timestamp = 9; // timestamp (in milliseconds) when the tween started, allows synchronization across clients
 }
 
 message Move {
diff --git a/scripts/check-proto-compabitility.sh b/scripts/check-proto-compabitility.sh
index c7f7120a..a067f937 100755
--- a/scripts/check-proto-compabitility.sh
+++ b/scripts/check-proto-compabitility.sh
@@ -1,21 +1,24 @@
 #!/bin/bash
 set -e -x
 
-# Download the main branch ref zip
-protocol_main_zip_url="https://github.com/decentraland/protocol/archive/refs/heads/main.zip"
-protocol_main_zip_local="./protocol-main.zip"
+# Use BASE_BRANCH environment variable or default to main
+BRANCH="${BASE_BRANCH:-main}"
+
+# Download the reference branch zip
+protocol_branch_zip_url="https://github.com/decentraland/protocol/archive/refs/heads/${BRANCH}.zip"
+protocol_branch_zip_local="./protocol-${BRANCH}.zip"
 
 TMP_ZIP_DIR=$(mktemp -d)
 
-curl -L "$protocol_main_zip_url" -o "$protocol_main_zip_local"
-unzip "$protocol_main_zip_local" -d "$TMP_ZIP_DIR"
-rm "$protocol_main_zip_local" || true
+curl -L "$protocol_branch_zip_url" -o "$protocol_branch_zip_local"
+unzip "$protocol_branch_zip_local" -d "$TMP_ZIP_DIR"
+rm "$protocol_branch_zip_local" || true
 
-ln -s "$(pwd)/node_modules" "$TMP_ZIP_DIR/protocol-main/node_modules"
+ln -s "$(pwd)/node_modules" "$TMP_ZIP_DIR/protocol-${BRANCH}/node_modules"
 
 # Run the `proto-compatibility-tool` and exclude the downloaded folder.
-echo "Checking the compatibility against $base_url"
-./node_modules/.bin/proto-compatibility-tool --recursive "$TMP_ZIP_DIR/protocol-main/proto" "proto"
+echo "Checking the compatibility against branch: ${BRANCH}"
+./node_modules/.bin/proto-compatibility-tool --recursive "$TMP_ZIP_DIR/protocol-${BRANCH}/proto" "proto"
 # ../proto-compatibility-tool/dist/bin.js --recursive "$TMP_ZIP_DIR/protocol-main" "."
 
 # rm -rf "$TMP_ZIP_DIR" || true
\ No newline at end of file