diff --git a/src/block.rs b/src/block.rs
index 121660f..92c4665 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -1,3 +1,5 @@
+use std::time::{Duration, Instant};
+
 use chrono::Utc;
 use serde::{Deserialize, Serialize};
 use sha3::{Digest, Sha3_512};
@@ -8,9 +10,11 @@ use crate::blockchain::BlockChain;
 pub struct Block {
     pub index: u64,
     pub timestamp: u64,
+    pub data: String,
     pub proof_of_work: u64,
     pub previous_hash: String,
     pub hash: String,
+    pub hash_time_cost: Duration,
 }
 
 impl Block {
@@ -24,13 +28,15 @@ impl Block {
         format!("{:x}", hash)
     }
 
-    pub fn new(index: u64, previous_hash: String) -> Self {
+    pub fn new(index: u64, data: String, previous_hash: String, instant: Instant) -> Self {
         Block {
             index,
             timestamp: Utc::now().timestamp_millis() as u64,
+            data,
             proof_of_work: 0_u64,
             previous_hash,
             hash: String::new(),
+            hash_time_cost: instant.elapsed(),
         }
     }
 
diff --git a/src/blockchain.rs b/src/blockchain.rs
index 784a8df..a6a450c 100644
--- a/src/blockchain.rs
+++ b/src/blockchain.rs
@@ -1,3 +1,5 @@
+use std::time::{Duration, Instant};
+
 use chrono::Utc;
 
 use crate::block::Block;
@@ -14,9 +16,11 @@ impl BlockChain {
         let genesis_block = Block {
             index: 0,
             timestamp: Utc::now().timestamp_millis() as u64,
+            data: String::from("Tahinli"),
             proof_of_work: 0_u64,
             previous_hash: String::new(),
             hash: String::new(),
+            hash_time_cost: Duration::from_secs(0),
         };
 
         let chain = vec![genesis_block.clone()];
@@ -28,10 +32,12 @@ impl BlockChain {
         }
     }
 
-    pub fn add_block(&mut self) {
+    pub fn add_block(&mut self, data: String, instant: Instant) {
         let new_block = Block::new(
             self.chain.len() as u64,
+            data,
             self.chain[&self.chain.len() - 1].hash.clone(),
+            instant,
         )
         .mine(self.clone());
         self.chain.push(new_block);
diff --git a/src/main.rs b/src/main.rs
index 719237d..eb88fa8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,14 +8,17 @@ fn main() {
     let difficulty = 1;
 
     let mut blockchain = BlockChain::new(difficulty);
-    let time = Instant::now();
-    BlockChain::add_block(&mut blockchain);
-    BlockChain::add_block(&mut blockchain);
-    BlockChain::add_block(&mut blockchain);
-    BlockChain::add_block(&mut blockchain);
+    let instant = Instant::now();
+    BlockChain::add_block(&mut blockchain, "T".to_string(), Instant::now());
+    BlockChain::add_block(&mut blockchain, "a".to_string(), Instant::now());
+    BlockChain::add_block(&mut blockchain, "h".to_string(), Instant::now());
+    BlockChain::add_block(&mut blockchain, "i".to_string(), Instant::now());
+    BlockChain::add_block(&mut blockchain, "n".to_string(), Instant::now());
+    BlockChain::add_block(&mut blockchain, "l".to_string(), Instant::now());
+    BlockChain::add_block(&mut blockchain, "i".to_string(), Instant::now());
     println!(
         "\t ⛏️⛏️⛏️    | Mined |   ⛏️⛏️⛏️\n\n\tElapsed: {:?}\n\n{:#?}",
-        time.elapsed(),
+        instant.elapsed(),
         blockchain
     );
 }