diff --git a/src/ssb.rpc.c b/src/ssb.rpc.c
index f7345870..48f7e865 100644
--- a/src/ssb.rpc.c
+++ b/src/ssb.rpc.c
@@ -148,6 +148,28 @@ static void _tf_ssb_rpc_blobs_get(tf_ssb_connection_t* connection, uint8_t flags
 	JS_FreeValue(context, ids);
 }
 
+typedef struct _blobs_has_work_t
+{
+	int64_t request_number;
+	char id[k_id_base64_len];
+	bool found;
+} blobs_has_work_t;
+
+static void _tf_ssb_rpc_blobs_has_work(tf_ssb_connection_t* connection, void* user_data)
+{
+	blobs_has_work_t* work = user_data;
+	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
+	work->found = tf_ssb_db_blob_has(ssb, work->id);
+}
+
+static void _tf_ssb_rpc_blobs_has_after_work(tf_ssb_connection_t* connection, int status, void* user_data)
+{
+	blobs_has_work_t* work = user_data;
+	tf_ssb_connection_rpc_send(connection, k_ssb_rpc_flag_json | k_ssb_rpc_flag_end_error | k_ssb_rpc_flag_stream, -work->request_number, NULL,
+		(const uint8_t*)(work->found ? "true" : "false"), strlen(work->found ? "true" : "false"), NULL, NULL, NULL);
+	tf_free(work);
+}
+
 static void _tf_ssb_rpc_blobs_has(tf_ssb_connection_t* connection, uint8_t flags, int32_t request_number, JSValue args, const uint8_t* message, size_t size, void* user_data)
 {
 	tf_ssb_t* ssb = tf_ssb_connection_get_ssb(connection);
@@ -160,11 +182,17 @@ static void _tf_ssb_rpc_blobs_has(tf_ssb_connection_t* connection, uint8_t flags
 	JSValue ids = JS_GetPropertyStr(context, args, "args");
 	JSValue id = JS_GetPropertyUint32(context, ids, 0);
 	const char* id_str = JS_ToCString(context, id);
-	bool has = tf_ssb_db_blob_has(ssb, id_str);
+
+	blobs_has_work_t* work = tf_malloc(sizeof(blobs_has_work_t));
+	*work = (blobs_has_work_t) {
+		.request_number = request_number,
+	};
+	snprintf(work->id, sizeof(work->id), "%s", id_str);
+	tf_ssb_connection_run_work(connection, _tf_ssb_rpc_blobs_has_work, _tf_ssb_rpc_blobs_has_after_work, work);
+
 	JS_FreeCString(context, id_str);
 	JS_FreeValue(context, id);
 	JS_FreeValue(context, ids);
-	tf_ssb_connection_rpc_send(connection, k_ssb_rpc_flag_json, -request_number, NULL, (const uint8_t*)(has ? "true" : "false"), strlen(has ? "true" : "false"), NULL, NULL, NULL);
 }
 
 static void _tf_ssb_rpc_blob_wants_added_callback(tf_ssb_t* ssb, const char* id, void* user_data)
diff --git a/src/ssb.tests.c b/src/ssb.tests.c
index f0b36bbe..4dc801e5 100644
--- a/src/ssb.tests.c
+++ b/src/ssb.tests.c
@@ -250,22 +250,51 @@ void tf_ssb_test_ssb(const tf_test_options_t* options)
 	tf_printf("Waiting for connection.\n");
 	while (test.connection_count0 != 1 || test.connection_count1 != 1)
 	{
+		tf_ssb_set_main_thread(ssb0, true);
+		tf_ssb_set_main_thread(ssb1, true);
 		uv_run(&loop, UV_RUN_ONCE);
+		tf_ssb_set_main_thread(ssb0, false);
+		tf_ssb_set_main_thread(ssb1, false);
 	}
 	tf_ssb_server_close(ssb0);
 
 	tf_printf("Waiting for messages.\n");
 	while (_ssb_test_count_messages(ssb1) < 3)
 	{
+		tf_ssb_set_main_thread(ssb0, true);
+		tf_ssb_set_main_thread(ssb1, true);
 		uv_run(&loop, UV_RUN_ONCE);
+		tf_ssb_set_main_thread(ssb0, false);
+		tf_ssb_set_main_thread(ssb1, false);
 	}
 
 	tf_printf("Waiting for blob.\n");
 	while (!tf_ssb_db_blob_get(ssb1, blob_id, NULL, NULL))
 	{
+		tf_ssb_set_main_thread(ssb0, true);
+		tf_ssb_set_main_thread(ssb1, true);
 		uv_run(&loop, UV_RUN_ONCE);
+		tf_ssb_set_main_thread(ssb0, false);
+		tf_ssb_set_main_thread(ssb1, false);
 	}
 
+	JSContext* context = tf_ssb_get_context(ssb1);
+	JSValue message = JS_NewObject(context);
+	JSValue name = JS_NewArray(context);
+	JS_SetPropertyUint32(context, name, 0, JS_NewString(context, "blobs"));
+	JS_SetPropertyUint32(context, name, 1, JS_NewString(context, "has"));
+	JS_SetPropertyStr(context, message, "name", name);
+	JSValue args = JS_NewArray(context);
+	JS_SetPropertyUint32(context, args, 0, JS_NewString(context, blob_id));
+	JS_SetPropertyStr(context, message, "args", args);
+	JS_SetPropertyStr(context, message, "type", JS_NewString(context, "async"));
+
+	tf_ssb_connection_t* connections[4] = { 0 };
+	tf_ssb_get_connections(ssb1, connections, 4);
+	int64_t request_number = tf_ssb_connection_next_request_number(connections[0]);
+	tf_ssb_connection_rpc_send_json(connections[0], k_ssb_rpc_flag_stream | k_ssb_rpc_flag_new_request, request_number, "blobs.has", message, NULL, NULL, NULL);
+	JS_FreeValue(context, message);
+
 	uint8_t* b1;
 	size_t s1 = 0;
 	b = tf_ssb_db_blob_get(ssb1, blob_id, &b1, &s1);
@@ -293,14 +322,22 @@ void tf_ssb_test_ssb(const tf_test_options_t* options)
 
 	while (count0 == 0)
 	{
+		tf_ssb_set_main_thread(ssb0, true);
+		tf_ssb_set_main_thread(ssb1, true);
 		uv_run(&loop, UV_RUN_ONCE);
+		tf_ssb_set_main_thread(ssb0, false);
+		tf_ssb_set_main_thread(ssb1, false);
 	}
 	tf_ssb_remove_message_added_callback(ssb0, _message_added, &count0);
 
 	tf_printf("Waiting for message from other.\n");
 	while (count1 == 0)
 	{
+		tf_ssb_set_main_thread(ssb0, true);
+		tf_ssb_set_main_thread(ssb1, true);
 		uv_run(&loop, UV_RUN_ONCE);
+		tf_ssb_set_main_thread(ssb0, false);
+		tf_ssb_set_main_thread(ssb1, false);
 	}
 	tf_ssb_remove_message_added_callback(ssb1, _message_added, &count1);
 	tf_printf("done\n");
@@ -311,7 +348,11 @@ void tf_ssb_test_ssb(const tf_test_options_t* options)
 	uv_close((uv_handle_t*)&idle1, NULL);
 
 	tf_printf("final run\n");
+	tf_ssb_set_main_thread(ssb0, true);
+	tf_ssb_set_main_thread(ssb1, true);
 	uv_run(&loop, UV_RUN_DEFAULT);
+	tf_ssb_set_main_thread(ssb0, false);
+	tf_ssb_set_main_thread(ssb1, false);
 	tf_printf("done\n");
 
 	tf_printf("destroy 0\n");