diff --git a/swagger.yaml b/swagger.yaml
index 1d63d4de..cf708944 100644
--- a/swagger.yaml
+++ b/swagger.yaml
@@ -1428,7 +1428,7 @@ components:
         delegatees:
           type: object
           additionalProperties:
-            type: float
+            type: number
     SetDelegateeResponse:
       type: object
       properties:
diff --git a/tig-benchmarker/common/structs.py b/tig-benchmarker/common/structs.py
index c746f3d2..c2d29f1b 100644
--- a/tig-benchmarker/common/structs.py
+++ b/tig-benchmarker/common/structs.py
@@ -161,8 +161,8 @@ class BlockDetails(FromDict):
 
 @dataclass
 class BlockData(FromDict):
-    confirmed_ids: Dict[str, Set[int]]
-    active_ids: Dict[str, Set[int]]
+    confirmed_ids: Dict[str, Set[str]]
+    active_ids: Dict[str, Set[str]]
 
 @dataclass
 class Block(FromDict):
diff --git a/tig-benchmarker/master/master/submissions_manager.py b/tig-benchmarker/master/master/submissions_manager.py
index 1833cba7..3130390f 100644
--- a/tig-benchmarker/master/master/submissions_manager.py
+++ b/tig-benchmarker/master/master/submissions_manager.py
@@ -1,3 +1,4 @@
+import brotli
 import requests
 import threading
 import logging
@@ -46,7 +47,14 @@ def _post(self, submission_type: str, req: Union[SubmitPrecommitRequest, SubmitB
             logger.info(f"submitting {submission_type} '{req.benchmark_id}'")
         logger.debug(f"{req}")
         
-        resp = requests.post(f"{api_url}/submit-{submission_type}", json=req.to_dict(), headers=headers)
+        data = jsonify(req)
+        if len(data) > 10 * 1024:
+            headers.update({
+                'Content-Encoding': 'br',
+                'Accept-Encoding': 'br',
+            })
+            data = brotli.compress(data)
+        resp = requests.post(f"{api_url}/submit-{submission_type}", data=data, headers=headers)
         if resp.status_code == 200:
             logger.info(f"submitted {submission_type} successfully")
         elif resp.headers.get("Content-Type") == "text/plain":
diff --git a/tig-benchmarker/master/requirements.txt b/tig-benchmarker/master/requirements.txt
index d01ed26a..b46c68f9 100644
--- a/tig-benchmarker/master/requirements.txt
+++ b/tig-benchmarker/master/requirements.txt
@@ -1,4 +1,5 @@
 blake3
+brotli
 dataclasses
 hypercorn
 numpy