From 84b41b9a6619094383dbacfbdaa8c0f3e2819113 Mon Sep 17 00:00:00 2001
From: littleblack111 <littleblack11111@gmail.com>
Date: Tue, 21 Oct 2025 20:53:28 +0800
Subject: fix(block): save actual PoW nonce instead of hashed

---
 src/blocks.rs  | 10 +++++-----
 src/network.rs |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/blocks.rs b/src/blocks.rs
index 17e6d4f..67af3f1 100644
--- a/src/blocks.rs
+++ b/src/blocks.rs
@@ -17,7 +17,7 @@ pub trait CryptoDigest {
 pub struct Block {
     pub prev_hash: Vec<u8>,
     pub trans: Transaction,
-    pub pow: Vec<u8>,
+    pub pow: Option<u64>,
 }
 
 impl Block {
@@ -27,7 +27,7 @@ impl Block {
                 .unwrap_or(&[])
                 .to_vec(), // special blocks
             trans,
-            pow: Vec::default(),
+            pow: None,
         }
     }
 
@@ -45,14 +45,14 @@ impl Block {
             })
     }
 
-    fn calc_pow(&self) -> Vec<u8> {
+    fn calc_pow(&self) -> u64 {
         for i in 0.. {
             // reset every loop
             let mut hasher = Sha256::new();
             Digest::update(&mut hasher, bincode::encode_to_vec((&self.prev_hash, &self.trans, i), bincode::config::standard()).unwrap());
             let hashed = hasher.finalize();
             if Self::pref_zeros(&hashed).is_ok() {
-                return hashed.to_vec();
+                return i;
             }
         }
         unreachable!()
@@ -65,7 +65,7 @@ impl Block {
     }
 
     pub fn calc_set_pow(&mut self) {
-        self.pow = self.calc_pow();
+        self.pow = Some(self.calc_pow());
     }
 }
 
diff --git a/src/network.rs b/src/network.rs
index c18ae07..197c997 100644
--- a/src/network.rs
+++ b/src/network.rs
@@ -225,7 +225,7 @@ impl Peer {
             Request::Block(mut block) => {
                 if !block
                     .pow
-                    .is_empty()
+                    .is_none()
                 {
                     if !block.verify_pow() {
                         eprintln!("Rejecting remote block, POW verification failed"); // TODO: log remote IP
@@ -274,7 +274,7 @@ impl Peer {
                             .fold(true, |i, b| {
                                 if i {
                                     b.pow
-                                        .is_empty()
+                                        .is_none()
                                 } else {
                                     false
                                 }
-- 
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