From d4670375f8899d0d67941758a5ecef55a29ee6bb Mon Sep 17 00:00:00 2001
From: skoupidi <skoupidi@systemli.org>
Date: Wed, 23 Jul 2025 13:14:35 +0300
Subject: [PATCH] blockchain/mod.rs: bound randomx vm keys to be before
 optional height

---
 src/blockchain/mod.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/blockchain/mod.rs b/src/blockchain/mod.rs
index 2f51d67b4..8872bbdf4 100644
--- a/src/blockchain/mod.rs
+++ b/src/blockchain/mod.rs
@@ -434,7 +434,7 @@ impl Blockchain {
 
     /// Grab the RandomX VM current and next key, based on provided key
     /// changing height and delay. Optionally, a height can be provided
-    /// to get the keys at it.
+    /// to get the keys before it.
     ///
     /// NOTE: the height calculation logic is verified using test:
     //        test_randomx_keys_retrieval_logic
@@ -446,7 +446,7 @@ impl Blockchain {
     ) -> Result<([u8; 32], [u8; 32])> {
         // Grab last known block header
         let last = match height {
-            Some(h) => &self.get_headers_by_heights(&[h])?[0],
+            Some(h) => &self.get_headers_by_heights(&[if h != 0 { h - 1 } else { 0 }])?[0],
             None => &self.last_header()?,
         };