From d110d3b9e156a8fbd3714fa04fc1c392daecbf7c Mon Sep 17 00:00:00 2001
From: pharesim <pharesim@protonmail.com>
Date: Fri, 23 Jun 2017 02:09:53 +0200
Subject: [PATCH] Issue #13 - use head_block - 3 as reference

---
 steembase/transactions.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/steembase/transactions.py b/steembase/transactions.py
index 4c25290..e09caed 100644
--- a/steembase/transactions.py
+++ b/steembase/transactions.py
@@ -327,8 +327,9 @@ def get_block_params(steem):
         witness node!
     """
     props = steem.get_dynamic_global_properties()
-    ref_block_num = props["head_block_number"] & 0xFFFF
-    ref_block_prefix = struct.unpack_from("<I", unhexlify(props["head_block_id"]), 4)[0]
+    ref_block_num = props["head_block_number"] - 3 & 0xFFFF
+    ref_block = ws.get_block(props["head_block_number"] - 2)
+    ref_block_prefix = struct.unpack_from("<I", unhexlify(ref_block["previous"]), 4)[0]
     return ref_block_num, ref_block_prefix