diff --git a/.gitignore b/.gitignore
index 03b2709..1de5659 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-btc_mine_simulator/target/
+target
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..056bfda
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,198 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "btc_mine_simulator"
+version = "0.1.0"
+dependencies = [
+ "secp256k1",
+ "serde",
+ "serde_json",
+ "sha2",
+]
+
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+ "unicode-ident",
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+
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diff --git a/btc_mine_simulator/Cargo.toml b/Cargo.toml
similarity index 87%
rename from btc_mine_simulator/Cargo.toml
rename to Cargo.toml
index eca64dc..c79a9c8 100644
--- a/btc_mine_simulator/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,6 @@ edition = "2021"
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+secp256k1 = "0.29.0"
+sha2 = "0.10.8"
+
diff --git a/btc_mine_simulator/.gitignore b/btc_mine_simulator/.gitignore
deleted file mode 100644
index 1de5659..0000000
--- a/btc_mine_simulator/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-target
\ No newline at end of file
diff --git a/btc_mine_simulator/Cargo.lock b/btc_mine_simulator/Cargo.lock
deleted file mode 100644
index 250d632..0000000
--- a/btc_mine_simulator/Cargo.lock
+++ /dev/null
@@ -1,89 +0,0 @@
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-# It is not intended for manual editing.
-version = 3
-
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-name = "btc_mine_simulator"
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diff --git a/btc_mine_simulator/src/main.rs b/btc_mine_simulator/src/main.rs
deleted file mode 100644
index 883e70f..0000000
--- a/btc_mine_simulator/src/main.rs
+++ /dev/null
@@ -1,73 +0,0 @@
-use std::fs;
-use std::io;
-use std::path::Path;
-
-mod tx;
-mod validate;
-use tx::Transaction;
-use validate::validate_transaction;
-
-fn read_transactions_from_dir(dir: &Path) -> io::Result<(Vec<Transaction>, usize, usize)> {
-    let mut transactions = Vec::new();
-    let mut total_files = 0;
-    let mut failed_parses = 0;
-
-    for entry in fs::read_dir(dir)? {
-        let entry = entry?;
-        let path = entry.path();
-        if path.is_file() {
-            total_files += 1;
-            match fs::read_to_string(&path) {
-                Ok(data) => {
-                    match serde_json::from_str::<Transaction>(&data) {
-                        Ok(transaction) => transactions.push(transaction),
-                        Err(e) => { // Capture the parse error
-                            failed_parses += 1;
-                            println!("Failed to parse file: {:?}, Reason: {}", path.display(), e);
-                            // Prints out the specific reason for the parse failure
-                        },
-                    }
-                },
-                Err(e) => { // Capture the file read error
-                    println!("Failed to read file: {:?}, Reason: {}", path.display(), e);
-                    // This case handles file read errors
-                }
-            }
-        }
-    }
-    for tx in &transactions {
-        // println!("{:?}", tx.locktime);
-        if tx.locktime != 0 {
-            println!("wow {:?}", tx.locktime);
-        }
-    }
-
-    println!("Total files processed: {}", total_files);
-    println!("Failed to parse: {}", failed_parses);
-    Ok((transactions, total_files, failed_parses))
-}
-
-fn main() {
-    let dir = Path::new("../mempool");
-    let txs = match read_transactions_from_dir(dir) {
-        Ok((transactions, total_files, failed_parses)) => {
-            println!("Successfully parsed transactions: {}", transactions.len());
-            println!("Total files: {}", total_files);
-            println!("Failed parses: {}", failed_parses);
-            transactions
-        },
-        Err(e) => panic!("Error reading transactions: {}", e),
-    };
-    let mut res = 0;
-    for tx in &txs {
-        if let Err(e) = validate_transaction(tx) {
-            println!("{:?}", tx.);
-            res += 1;
-            println!("error: {:?}", e);
-
-        }
-        
-    }
-    println!("{:?}", res);
-    
-}
diff --git a/btc_mine_simulator/src/tx.rs b/btc_mine_simulator/src/tx.rs
deleted file mode 100644
index d4d1f8b..0000000
--- a/btc_mine_simulator/src/tx.rs
+++ /dev/null
@@ -1,40 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Transaction {
-    pub version: i32,
-    pub locktime: u32,
-    pub vin: Vec<Input>,
-    pub vout: Vec<Output>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Input {
-    pub txid: String,
-    pub vout: u32,
-    pub prevout: PrevOut,
-    pub scriptsig: String,
-    pub scriptsig_asm: String,
-    pub witness: Option<Vec<String>>,
-    pub is_coinbase: bool,
-    pub sequence: u32,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct PrevOut {
-    pub scriptpubkey: String,
-    pub scriptpubkey_asm: String,
-    pub scriptpubkey_type: String,
-    pub scriptpubkey_address: String,
-    pub value: u64,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Output {
-    pub scriptpubkey: String,
-    pub scriptpubkey_asm: String,
-    pub scriptpubkey_type: String,
-    pub scriptpubkey_address: Option<String>,
-    pub value: u64,
-}
-
diff --git a/btc_mine_simulator/src/validate.rs b/btc_mine_simulator/src/validate.rs
deleted file mode 100644
index e918d7d..0000000
--- a/btc_mine_simulator/src/validate.rs
+++ /dev/null
@@ -1,44 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-use crate::tx::Transaction;
-
-// Assuming the structs Transaction, Input, Output, PrevOut are defined as above
-
-pub fn validate_transaction(tx: &Transaction) -> Result<(), String> {
-    if tx.version < 1 || tx.version > 2 {
-        return Err("Unsupported transaction version".to_string());
-    }
-
-    if tx.vin.is_empty() {
-        return Err("Transaction has no inputs".to_string());
-    }
-
-    if tx.vout.is_empty() {
-        return Err("Transaction has no outputs".to_string());
-    }
-
-    for input in &tx.vin {
-        if input.is_coinbase && tx.vin.len() > 1 {
-            return Err("Coinbase transaction has more than one input".to_string());
-        }
-
-        if !input.is_coinbase && input.txid.is_empty() {
-            return Err("Input txid is empty".to_string());
-        }
-
-        if let Some(witness) = &input.witness {
-            if witness.is_empty() {
-                return Err("Witness is present but empty".to_string());
-            }
-        }
-    }
-
-    // let total_output_value: u64 = tx.vout.iter().map(|output| output.value).sum();
-    // if total_output_value == 0 {
-    //     return Err("Total output value is 0".to_string());
-    // }
-
-    // Further checks can include scriptsig and scriptpubkey validation, which are complex and require executing the scripts
-
-    Ok(())
-}
diff --git a/output.txt b/output.txt
new file mode 100644
index 0000000..9681ea3
--- /dev/null
+++ b/output.txt
@@ -0,0 +1,103 @@
+BlockHeader { version: 1, previous_block_hash: "", merkle_root: "", time: 0, bits: 0, nonce: 35022 }
+{"version":1,"locktime":0,"vin":[{"txid":"","vout":4294967295,"prevout":{"scriptpubkey":"","scriptpubkey_asm":"","scriptpubkey_type":"coinbase","scriptpubkey_address":"","value":0},"scriptsig":"arbitrary data","scriptsig_asm":"","witness":null,"is_coinbase":true,"sequence":4294967295}],"vout":[{"scriptpubkey":"miner's address or script","scriptpubkey_asm":"","scriptpubkey_type":"pay to script hash or pay to public key hash","scriptpubkey_address":"miner's address","value":6250616824}]}
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diff --git a/run.sh b/run.sh
index 721aeb2..ac1cdb7 100755
--- a/run.sh
+++ b/run.sh
@@ -1 +1,2 @@
-# Update this file to run your own code
\ No newline at end of file
+# Update this file to run your own code
+cargo run
\ No newline at end of file
diff --git a/src/block.rs b/src/block.rs
new file mode 100644
index 0000000..c1519fb
--- /dev/null
+++ b/src/block.rs
@@ -0,0 +1,57 @@
+use serde::{Deserialize, Serialize};
+use serde_json;
+use sha2::{Digest, Sha256};
+use std::{fs::File, io::Write, vec};
+
+use crate::tx::Transaction;
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct BlockHeader {
+    pub version: i32,
+    pub previous_block_hash: String,
+    pub merkle_root: String,
+    pub time: u32,
+    pub bits: u32,
+    pub nonce: u32,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Block {
+    pub header: BlockHeader,
+    pub transactions: Vec<Transaction>,
+}
+
+impl Block {
+    pub fn mine(&mut self, difficulty_target: &str) {
+        loop {
+            let header = serde_json::to_string(&self.header).unwrap();
+            let hash = Sha256::digest(header.as_bytes());
+            let hash_hex = format!("{:x}", hash);
+
+            if hash_hex < difficulty_target.to_owned() {
+                println!("Block mined: {}", hash_hex);
+                break;
+            }
+
+            self.header.nonce += 1;
+        }
+    }
+
+    pub fn generate_output(&self) {
+        let mut output = File::create("output.txt").unwrap();
+
+        // Write block header
+        writeln!(output, "{:?}", self.header).unwrap();
+
+        // Serialize and write coinbase transaction
+        let coinbase_tx = serde_json::to_string(&self.transactions[0]).unwrap();
+        writeln!(output, "{}", coinbase_tx).unwrap();
+
+        // Write transaction IDs
+        for tx in &self.transactions {
+            let tx_json = serde_json::to_string(tx).unwrap();
+            let txid = Sha256::digest(tx_json.as_bytes());
+            writeln!(output, "{:x}", txid).unwrap();
+        }
+    }
+}
diff --git a/src/coinbase.rs b/src/coinbase.rs
new file mode 100644
index 0000000..7689354
--- /dev/null
+++ b/src/coinbase.rs
@@ -0,0 +1,38 @@
+use crate::tx::{Input, Output, PrevOut, Transaction};
+
+// Assume these are the calculated values
+pub fn create_coinbase_transaction(block_reward: u64, total_fees: u64) -> Transaction {
+    // The output value of the coinbase transaction is the sum of block reward and total fees
+    let output_value = block_reward + total_fees;
+
+    Transaction {
+        version: 1,  // Version of the transaction format
+        locktime: 0, // Typically 0 for coinbase transactions
+        vin: vec![Input {
+            // Coinbase transactions have a single input
+            txid: String::new(), // No input transaction (empty string or all zeros)
+            vout: 0xffffffff,    // Maximum value as it's not referencing a real output
+            prevout: PrevOut {
+                // Dummy prevout for coinbase tx
+                scriptpubkey: String::new(), // Could be used to include miner-specific data
+                scriptpubkey_asm: String::new(),
+                scriptpubkey_type: String::from("coinbase"),
+                scriptpubkey_address: String::new(),
+                value: 0, // No input value
+            },
+            scriptsig: String::from("arbitrary data"), // Miners can include arbitrary data here
+            scriptsig_asm: String::new(),
+            witness: None,
+            is_coinbase: true,
+            sequence: 0xffffffff, // Full sequence
+        }],
+        vout: vec![Output {
+            // The output sending the reward to the miner's address
+            scriptpubkey: String::from("miner's address or script"),
+            scriptpubkey_asm: String::new(),
+            scriptpubkey_type: String::from("pay to script hash or pay to public key hash"),
+            scriptpubkey_address: Some(String::from("miner's address")),
+            value: output_value,
+        }],
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ce9abfb
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,111 @@
+use std::collections::HashSet;
+use std::fs;
+use std::io;
+use std::path::Path;
+
+mod block;
+mod coinbase;
+mod tx;
+mod validate;
+use tx::Transaction;
+
+use crate::block::Block;
+use crate::block::BlockHeader;
+use crate::coinbase::create_coinbase_transaction;
+
+// use validate::validate_transaction;
+
+fn read_transactions_from_dir(dir: &Path) -> io::Result<(Vec<Transaction>, usize, usize)> {
+    let mut transactions = Vec::new();
+    let mut total_files = 0;
+    let mut failed_parses = 0;
+
+    for entry in fs::read_dir(dir)? {
+        let entry = entry?;
+        let path = entry.path();
+        if path.is_file() {
+            total_files += 1;
+            match fs::read_to_string(&path) {
+                Ok(data) => match serde_json::from_str::<Transaction>(&data) {
+                    Ok(transaction) => transactions.push(transaction),
+                    Err(_) => {
+                        failed_parses += 1;
+                    }
+                },
+                Err(_) => {}
+            }
+        }
+    }
+
+    Ok((transactions, total_files, failed_parses))
+}
+
+fn get_tx() -> Vec<Transaction> {
+    let dir = Path::new("./mempool");
+    let txs = match read_transactions_from_dir(dir) {
+        Ok((transactions, total_files, failed_parses)) => {
+            println!("Successfully parsed transactions: {}", transactions.len());
+            println!("Total files: {}", total_files);
+            println!("Failed parses: {}", failed_parses);
+            transactions
+        }
+        Err(e) => panic!("Error reading transactions: {}", e),
+    };
+
+    let mut invalid_transactions = 0;
+    let mut fail = 0;
+    let mut valid_txs = vec![];
+    for tx in txs {
+        // if let Err(_) = validate_transaction(tx) {
+        //     invalid_transactions += 1;
+        // }
+        if tx.is_basic_valid() {
+            valid_txs.push(tx);
+        }
+    }
+    valid_txs
+}
+
+fn select_tx_for_block(txs: Vec<Transaction>) -> Vec<Transaction> {
+    // let mut res = vec!{};
+    // for i in 0..100 {
+    //     res.push(txs[i]);
+    // }
+    // res
+    txs[0..100].to_vec()
+}
+
+fn main() {
+    let txs = get_tx();
+
+    let mut valid = select_tx_for_block(txs);
+    let total_fees = valid.iter().fold(0, |acc, x| acc + x.fee());
+
+    let br = 6_250_000_000;
+    let cb_tx = create_coinbase_transaction(br, total_fees);
+    let mut valid_tx = vec![cb_tx];
+    valid_tx.append(&mut valid);
+
+    let difficulty_target = "0000ffff00000000000000000000000000000000000000000000000000000000";
+
+    let mut block = Block {
+        header: BlockHeader {
+            version: 1,
+            previous_block_hash: "".to_string(),
+            merkle_root: "".to_string(),
+            time: 0,
+            bits: 0,
+            nonce: 0,
+        },
+        transactions: valid_tx,
+    };
+
+    block.mine(difficulty_target);
+    block.generate_output();
+
+    // println!("Invalid transactions: {}", invalid_transactions);
+    // println!("Different script types found:");
+    // for script_type in script_types {
+    //     println!("- {}", script_type);
+    // }
+}
diff --git a/src/p2pkh.rs b/src/p2pkh.rs
new file mode 100644
index 0000000..406e5a1
--- /dev/null
+++ b/src/p2pkh.rs
@@ -0,0 +1,3 @@
+fn validate() {
+    
+}
\ No newline at end of file
diff --git a/src/tx.rs b/src/tx.rs
new file mode 100644
index 0000000..a314240
--- /dev/null
+++ b/src/tx.rs
@@ -0,0 +1,75 @@
+use std::clone;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct Transaction {
+    pub version: i32,
+    pub locktime: u32,
+    pub vin: Vec<Input>,
+    pub vout: Vec<Output>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct Input {
+    pub txid: String,
+    pub vout: u32,
+    pub prevout: PrevOut,
+    pub scriptsig: String,
+    pub scriptsig_asm: String,
+    pub witness: Option<Vec<String>>,
+    pub is_coinbase: bool,
+    pub sequence: u32,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct PrevOut {
+    pub scriptpubkey: String,
+    pub scriptpubkey_asm: String,
+    pub scriptpubkey_type: String,
+    pub scriptpubkey_address: String,
+    pub value: u64,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct Output {
+    pub scriptpubkey: String,
+    pub scriptpubkey_asm: String,
+    pub scriptpubkey_type: String,
+    pub scriptpubkey_address: Option<String>,
+    pub value: u64,
+}
+
+impl Transaction {
+    pub fn is_basic_valid(&self) -> bool {
+        if self.vin.len() == 0 || self.vout.len() == 0 {
+            return false;
+        }
+
+        let mut in_value = 0;
+        for input in &self.vin {
+            in_value += input.prevout.value;
+        }
+        let mut out_value = 0;
+        for output in &self.vout {
+            out_value += output.value;
+        }
+        if in_value < out_value {
+            return false;
+        }
+
+        true
+    }
+
+    pub fn fee(&self) -> u64 {
+        let mut in_value = 0;
+        for input in &self.vin {
+            in_value += input.prevout.value;
+        }
+        let mut out_value = 0;
+        for output in &self.vout {
+            out_value += output.value;
+        }
+        in_value - out_value
+    }
+}
diff --git a/src/validate.rs b/src/validate.rs
new file mode 100644
index 0000000..dac059a
--- /dev/null
+++ b/src/validate.rs
@@ -0,0 +1,71 @@
+// use crate::tx::Transaction;
+// use secp256k1::{Message, PublicKey, Secp256k1, Signature};
+// use sha2::{Digest, Sha256};
+
+// pub fn validate_transaction(tx: &Transaction) -> Result<(), String> {
+//     let secp = Secp256k1::verification_only();
+
+//     for (i, input) in tx.vin.iter().enumerate() {
+//         if input.is_coinbase {
+//             continue;
+//         }
+
+//         // Validate the script type and extract the public key
+//         let prev_output = &input.prevout;
+//         let public_key = match prev_output.scriptpubkey_type.as_str() {
+//             "v1_p2tr" => {
+//                 let pubkey_hex = &prev_output.scriptpubkey_asm[29..];
+//                 PublicKey::from_slice(&hex::decode(pubkey_hex).map_err(|_| "Invalid public key")?)
+//                     .map_err(|_| "Invalid public key")?
+//             }
+//             _ => return Err("Unsupported script type".to_string()),
+//         };
+
+//         // Verify the signature
+//         let signature = Signature::from_der(&hex::decode(&input.witness.as_ref().unwrap()[0]).map_err(|_| "Invalid signature")?)
+//             .map_err(|_| "Invalid signature")?;
+
+//         // Assuming the sighash type is `SIGHASH_ALL`
+//         let sighash_all: u32 = 1;
+
+//         let mut sig_hash = Sha256::new();
+//         sig_hash.update(&tx.version.to_le_bytes());
+
+//         for (j, input) in tx.vin.iter().enumerate() {
+//             if i == j {
+//                 sig_hash.update(&hex::decode(&input.prevout.scriptpubkey).map_err(|_| "Invalid scriptpubkey")?);
+//             } else {
+//                 sig_hash.update(&[0; 32]);
+//                 sig_hash.update(&[0; 4]);
+//             }
+//             sig_hash.update(&input.sequence.to_le_bytes());
+//         }
+
+//         for output in &tx.vout {
+//             sig_hash.update(&output.value.to_le_bytes());
+//             sig_hash.update(&hex::decode(&output.scriptpubkey).map_err(|_| "Invalid scriptpubkey")?);
+//         }
+
+//         sig_hash.update(&tx.locktime.to_le_bytes());
+//         sig_hash.update(&sighash_all.to_le_bytes());
+
+//         let message = Message::from_slice(&sig_hash.finalize()).map_err(|_| "Invalid message")?;
+//         secp.verify(&message, &signature, &public_key)
+//             .map_err(|_| "Signature verification failed")?;
+//     }
+
+//     let total_output_value: u64 = tx.vout.iter().map(|output| output.value).sum();
+
+//     let mut total_input_value = 0;
+//     for input in &tx.vin {
+//         if !input.is_coinbase {
+//             total_input_value += input.prevout.value;
+//         }
+//     }
+
+//     if total_output_value > total_input_value {
+//         return Err("Total output value exceeds total input value".to_string());
+//     }
+
+//     Ok(())
+// }
diff --git a/btc_mine_simulator/todo b/todo
similarity index 100%
rename from btc_mine_simulator/todo
rename to todo