diff --git a/Cargo.toml b/Cargo.toml
index 08225ed..6454969 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "alfis"
-version = "0.4.22"
+version = "0.4.23"
 authors = ["Revertron <alfis@revertron.com>"]
 edition = "2018"
 build = "build.rs"
diff --git a/src/blockchain/block.rs b/src/blockchain/block.rs
index 3316f0b..4ad0f88 100644
--- a/src/blockchain/block.rs
+++ b/src/blockchain/block.rs
@@ -5,7 +5,7 @@ use std::fmt::Debug;
 use serde::{Serialize, Deserialize};
 use crate::bytes::Bytes;
 use crate::Transaction;
-use crate::blockchain::hash_utils::hash_difficulty;
+use crate::blockchain::hash_utils::{hash_difficulty, key_hash_difficulty};
 
 #[derive(Clone, Serialize, Deserialize, PartialEq, Debug)]
 pub struct Block {
@@ -68,15 +68,30 @@ impl Block {
         Vec::from(serde_json::to_string(&self).unwrap().as_bytes())
     }
 
+    /// Checks if this block is superior than the other
     pub fn is_better_than(&self, other: &Block) -> bool {
-        if self.transaction.is_none() && other.transaction.is_some() {
-            return false;
+        if self.transaction.is_some() && other.transaction.is_none() {
+            return true;
         }
-        if hash_difficulty(self.hash.as_slice()) < hash_difficulty(other.hash.as_slice()) {
-            return false;
+        let my_diff = hash_difficulty(self.hash.as_slice());
+        let it_diff = hash_difficulty(other.hash.as_slice());
+        if my_diff > it_diff {
+            return true;
+        }
+        let my_diff = key_hash_difficulty(self.hash.as_slice());
+        let it_diff = key_hash_difficulty(other.hash.as_slice());
+        if my_diff > it_diff {
+            return true;
+        }
+        let my_diff = hash_difficulty(self.signature.as_slice());
+        let it_diff = hash_difficulty(other.signature.as_slice());
+        if my_diff > it_diff {
+            return true;
+        }
+        if self.nonce < other.nonce {
+            return true;
         }
-        // TODO add more checks
 
-        true
+        false
     }
 }
\ No newline at end of file
diff --git a/src/blockchain/hash_utils.rs b/src/blockchain/hash_utils.rs
index e1a7c1f..5c42d77 100644
--- a/src/blockchain/hash_utils.rs
+++ b/src/blockchain/hash_utils.rs
@@ -70,7 +70,7 @@ pub fn hash_difficulty(hash: &[u8]) -> u32 {
 
 /// Returns hash difficulty for keys (only from the start)
 #[inline]
-pub fn hash_difficulty_key(hash: &[u8]) -> u32 {
+pub fn key_hash_difficulty(hash: &[u8]) -> u32 {
     let bytes: [u8; 8] = hash[..8].try_into().unwrap();
     let int = u64::from_be_bytes(bytes);
     int.leading_zeros()
diff --git a/src/keys.rs b/src/keys.rs
index 87bdede..5aea0e7 100644
--- a/src/keys.rs
+++ b/src/keys.rs
@@ -166,7 +166,7 @@ impl PartialEq for Keystore {
 /// TODO Optimize by caching Blakeout somewhere
 pub fn check_public_key_strength(key: &Bytes, strength: u32) -> bool {
     let bytes = blakeout_data(&key);
-    hash_difficulty_key(&bytes) >= strength
+    key_hash_difficulty(&bytes) >= strength
 }
 
 pub fn create_key(context: Arc<Mutex<Context>>) {
@@ -230,7 +230,7 @@ fn generate_key(difficulty: u32, mining: Arc<AtomicBool>) -> Option<Keystore> {
         let keystore = Keystore::from_random_bytes(&buf);
         digest.reset();
         digest.update(keystore.get_public().as_slice());
-        if hash_difficulty_key(digest.result()) >= difficulty {
+        if key_hash_difficulty(digest.result()) >= difficulty {
             info!("Generated keypair with public key: {:?} and hash {:?}", &keystore.get_public(), &keystore.get_hash());
             return Some(keystore);
         }