From 1cd8dd93c638f12525fd646759c41577518d9da6 Mon Sep 17 00:00:00 2001
From: Arjan Zijderveld <5286904+arjanz@users.noreply.github.com>
Date: Thu, 11 Apr 2024 16:11:07 +0200
Subject: [PATCH] Use authority set of parent hash to determine block author
 (#386)

---
 substrateinterface/base.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/substrateinterface/base.py b/substrateinterface/base.py
index 2ca7788..7e9316d 100644
--- a/substrateinterface/base.py
+++ b/substrateinterface/base.py
@@ -2355,7 +2355,8 @@ def decode_block(block_data, block_data_hash=None):
 
                                     engine = bytes(log_digest[1][0])
                                     # Retrieve validator set
-                                    validator_set = self.query("Session", "Validators", block_hash=block_hash)
+                                    parent_hash = block_data['header']['parentHash']
+                                    validator_set = self.query("Session", "Validators", block_hash=parent_hash)
 
                                     if engine == b'BABE':
                                         babe_predigest = self.runtime_config.create_scale_object(