Change block nonce to u32

bin/darkfid/src/rpc_miner.rs

@@ -445,7 +445,7 @@ impl DarkfiNode {
 
         // Sign the DarkFi block
         let mut block = blocktemplate.block.clone();
-        block.header.nonce = *nonce as u64;
+        block.header.nonce = *nonce as u32;
         block.sign(&blocktemplate.secret);
         info!(
             target: "darkfid::rpc::miner_submit_solution",

bin/explorer/explorerd/src/service/blocks.rs

@@ -52,7 +52,7 @@ pub struct BlockRecord {
     /// Block creation timestamp
     pub timestamp: Timestamp,
     /// The block's nonce. This value changes arbitrarily with mining.
-    pub nonce: u64,
+    pub nonce: u32,
     /// Merkle tree root of the transactions hashes contained in this block
     pub transactions_root: String,
     /// Contracts states Monotree(SMT) root this block commits to

src/blockchain/header_store.rs

@@ -97,7 +97,7 @@ pub struct Header {
     /// Block creation timestamp
     pub timestamp: Timestamp,
     /// The block's nonce. This value changes arbitrarily with mining.
-    pub nonce: u64,
+    pub nonce: u32,
     /// Merkle tree root of the transactions hashes contained in this block
     pub transactions_root: MerkleNode,
     /// Contracts states Monotree(SMT) root this block commits to
@@ -109,7 +109,7 @@ pub struct Header {
 impl Header {
     /// Generates a new header with default transactions and state root,
     /// using DarkFi native Proof of Work data.
-    pub fn new(previous: HeaderHash, height: u32, timestamp: Timestamp, nonce: u64) -> Self {
+    pub fn new(previous: HeaderHash, height: u32, timestamp: Timestamp, nonce: u32) -> Self {
         let version = block_version(height);
         let transactions_root = MerkleTree::new(1).root(0).unwrap();
         let state_root = *EMPTY_HASH;
@@ -187,7 +187,7 @@ impl Default for Header {
             HeaderHash::new(blake3::hash(b"Let there be dark!").into()),
             0u32,
             Timestamp::current_time(),
-            0u64,
+            0u32,
         )
     }
 }

src/validator/pow.rs

@@ -18,7 +18,7 @@
 
 use std::{
     sync::{
-        atomic::{AtomicBool, AtomicU64, Ordering},
+        atomic::{AtomicBool, AtomicU32, Ordering},
         Arc,
     },
     thread,
@@ -572,10 +572,10 @@ pub fn mine_block(
 
     debug!(target: "validator::pow::randomx_vms_mine", "[MINER] Initializing mining threads...");
     let mut handles = Vec::with_capacity(vms.len());
-    let atomic_nonce = Arc::new(AtomicU64::new(0));
+    let atomic_nonce = Arc::new(AtomicU32::new(0));
     let found_header = Arc::new(AtomicBool::new(false));
-    let found_nonce = Arc::new(AtomicU64::new(0));
-    let threads = vms.len() as u64;
+    let found_nonce = Arc::new(AtomicU32::new(0));
+    let threads = vms.len() as u32;
     let mining_start = Instant::now();
     for t in 0..threads {
         // Check if stop signal is received