diff --git a/app/api/routes/_blockchain.py b/app/api/routes/_blockchain.py
index 47c6f99..2c50ce3 100644
--- a/app/api/routes/_blockchain.py
+++ b/app/api/routes/_blockchain.py
@@ -26,7 +26,7 @@ async def s_api_v1_blockchain_send_new_content_message(request):
         'description': lambda x: isinstance(x, str),
         'price': lambda x: (isinstance(x, str) and x.isdigit()),
         'allowResale': lambda x: isinstance(x, bool),
-        'royaltyParams': lambda x: (isinstance(x, dict) and valid_royalty_params(x)),
+        'royaltyParams': lambda x: (isinstance(x, list) and all([valid_royalty_params(y) for y in x])),
 
     }.items():
         assert field_key in request.json, f"No {field_key} provided"