diff --git a/Cargo.lock b/Cargo.lock
index 4c60e44..05a1bf4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "aead"
 version = "0.3.2"
@@ -65,7 +67,7 @@ dependencies = [
 
 [[package]]
 name = "alfis"
-version = "0.6.4"
+version = "0.6.5"
 dependencies = [
  "base64",
  "bincode",
diff --git a/Cargo.toml b/Cargo.toml
index 5a7404e..7213dd7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "alfis"
-version = "0.6.4"
+version = "0.6.5"
 authors = ["Revertron <alfis@revertron.com>"]
 edition = "2018"
 build = "build.rs"
diff --git a/src/blockchain/chain.rs b/src/blockchain/chain.rs
index 8cb2223..8bca584 100644
--- a/src/blockchain/chain.rs
+++ b/src/blockchain/chain.rs
@@ -785,7 +785,7 @@ impl Chain {
                     SIGNER_DIFFICULTY
                 }
             }
-            Some(t) => self.get_difficulty_for_transaction(&t)
+            Some(t) => self.get_difficulty_for_transaction(&t, block.index)
         };
         if block.difficulty < difficulty {
             warn!("Block difficulty is lower than needed");
@@ -821,7 +821,7 @@ impl Chain {
                 None => 0,
                 Some(block) => block.index
             };
-            // If this domain is available to this public key
+            // If this domain is not available to this public key
             if !self.is_id_available(current_height, &transaction.identity, &block.pub_key) {
                 warn!("Block {:?} is trying to spoof an identity!", &block);
                 return Bad;
@@ -959,11 +959,16 @@ impl Chain {
         true
     }
 
-    fn get_difficulty_for_transaction(&self, transaction: &Transaction) -> u32 {
+    fn get_difficulty_for_transaction(&self, transaction: &Transaction, index: u64) -> u32 {
         match transaction.class.as_ref() {
             CLASS_DOMAIN => {
+                // If this domain is already in blockchain we approve slightly smaller difficulty
+                let discount = match self.is_domain_in_blockchain(index, &transaction.identity) {
+                    true => { 1 }
+                    false => { 0 }
+                };
                 return match serde_json::from_str::<DomainData>(&transaction.data) {
-                    Ok(_) => DOMAIN_DIFFICULTY,
+                    Ok(_) => DOMAIN_DIFFICULTY - discount,
                     Err(_) => {
                         warn!("Error parsing DomainData from {:?}", transaction);
                         u32::MAX
diff --git a/src/web_ui.rs b/src/web_ui.rs
index af19dc9..118f2ab 100644
--- a/src/web_ui.rs
+++ b/src/web_ui.rs
@@ -560,7 +560,7 @@ fn format_event_now(kind: &str, message: &str) -> String {
     format!("addEvent('{}', '{}', '{}');", kind, time.format("%d.%m.%y %X"), message)
 }
 
-fn create_domain(_context: Arc<Mutex<Context>>, miner: Arc<Mutex<Miner>>, class: &str, name: &str, mut data: DomainData, difficulty: u32, keystore: &Keystore, signing: Bytes, encryption: Bytes) {
+fn create_domain(context: Arc<Mutex<Context>>, miner: Arc<Mutex<Miner>>, class: &str, name: &str, mut data: DomainData, difficulty: u32, keystore: &Keystore, signing: Bytes, encryption: Bytes) {
     let name = name.to_owned();
     let encrypted = CryptoBox::encrypt(encryption.as_slice(), name.as_bytes()).expect("Error encrypting domain name!");
     data.encrypted = Bytes::from_bytes(&encrypted);
@@ -572,7 +572,15 @@ fn create_domain(_context: Arc<Mutex<Context>>, miner: Arc<Mutex<Miner>>, class:
         (signing, encryption)
     };
     let transaction = Transaction::from_str(name, class.to_owned(), data, signing, encryption);
-    let block = Block::new(Some(transaction), keystore.get_public(), Bytes::default(), difficulty);
+    // If this domain is already in blockchain we approve slightly smaller difficulty
+    let discount = {
+        let context = context.lock().unwrap();
+        match context.chain.is_domain_in_blockchain(context.chain.get_height(), &transaction.identity) {
+            true => { 1 }
+            false => { 0 }
+        }
+    };
+    let block = Block::new(Some(transaction), keystore.get_public(), Bytes::default(), difficulty - discount);
     miner.lock().unwrap().add_block(block, keystore.clone());
 }