diff --git a/SwiftChain/Models/Blockchain.swift b/SwiftChain/Models/Blockchain.swift
index a00ee33..d962e5f 100644
--- a/SwiftChain/Models/Blockchain.swift
+++ b/SwiftChain/Models/Blockchain.swift
@@ -20,9 +20,9 @@ class Blockchain {
         let block = Block()
         block.previousHash = "0000genesis0000"
         block.index = 0
-        block.timestamp = 1701388800  // 1er Décembre 2023 00:00:00 GMT
+        block.timestamp = 1701388800
         block.difficulty = 4
-        block.nonce = 12345  // Nonce précalculé qui donne un hash valide
+        block.nonce = 12345
         block.hash = "000088c1731bed4996680d2c50ea3d9b573c1507d2d61866c0deff33a7f8cf5e"
         return block
     }()
@@ -86,7 +86,7 @@ class Blockchain {
         return nil
     }
 
-    private func calculateNewDifficulty() -> Int {
+    func calculateNewDifficulty() -> Int {
         guard chain.count >= 2 else { return minDifficulty }
 
         let lastBlock = chain.last!
@@ -123,18 +123,18 @@ class Blockchain {
         return true
     }
 
-    func validateChain(_ newChain: [Block]) -> Bool {
+    func validateChain(_ chain: [Block]) -> Bool {
         // Vérifier que la chaîne commence par notre bloc genesis codé en dur
-        guard let firstBlock = newChain.first,
+        guard let firstBlock = chain.first,
               firstBlock.hash == Blockchain.genesisBlock.hash else {
             print("Genesis block mismatch")
             return false
         }
 
         // Vérifier les blocs suivants
-        for i in 1..<newChain.count {
-            let block = newChain[i]
-            let previousBlock = newChain[i-1]
+        for i in 1..<chain.count {
+            let block = chain[i]
+            let previousBlock = chain[i-1]
 
             if block.previousHash != previousBlock.hash {
                 print("Invalid chain at block \(i): incorrect previous hash")
diff --git a/SwiftChain/Models/Node.swift b/SwiftChain/Models/Node.swift
index 88de9cb..e924e85 100644
--- a/SwiftChain/Models/Node.swift
+++ b/SwiftChain/Models/Node.swift
@@ -10,15 +10,19 @@ import Network
 
 class Node {
     private var peers: [NWConnection] = []
-    private let port: NWEndpoint.Port = 8333 // Port standard
+    private let port: NWEndpoint.Port = 8333
     private var listener: NWListener?
-    private let blockchain: Blockchain
+
+    // Le node possède et gère la blockchain
+    private let blockchain = Blockchain()
+    private let memPool: MemPool
+    private let accountManager = AccountManager()
 
     // Queue pour gérer les connexions de manière asynchrone
     private let queue = DispatchQueue(label: "com.blockchain.node")
 
-    init(blockchain: Blockchain) {
-        self.blockchain = blockchain
+    init() {
+        self.memPool = MemPool(accountManager: accountManager)
         setupListener()
     }
 
@@ -61,6 +65,71 @@ class Node {
         }
     }
 
+    func mineBlock(minerAddress: String) -> Block? {
+        guard let lastBlock = blockchain.chain.last else { return nil }
+
+        // Récupérer les transactions du mempool
+        var transactions = memPool.getTransactionsForBlock()
+
+        // Créer la récompense de minage
+        let miningReward = Transaction(
+            sender: "SYSTEM",
+            receiver: minerAddress,
+            amount: 50,
+            type: "MINING_REWARD"
+        )
+        transactions.append(miningReward)
+
+        // Créer et miner le bloc
+        let newBlock = Block(
+            transactions: transactions,
+            previousHash: lastBlock.hash,
+            index: blockchain.chain.count,
+            difficulty: blockchain.calculateNewDifficulty()
+        )
+
+        newBlock.miner = minerAddress
+        newBlock.timestamp = Int(Date().timeIntervalSince1970)
+        let miningTime = newBlock.mineBlock()
+
+        // Valider et traiter les transactions
+        if accountManager.processBlock(newBlock) {
+            blockchain.chain.append(newBlock)
+            broadcastBlock(newBlock)
+
+            print("""
+                Block \(newBlock.index) created:
+                Hash: \(newBlock.hash)
+                Previous hash: \(newBlock.previousHash)
+                Transactions: \(newBlock.transactions.count)
+                Mining time: \(String(format: "%.2f", miningTime)) seconds
+                """)
+            return newBlock
+        }
+
+        return nil
+    }
+
+    func submitTransaction(_ transaction: Transaction) -> Bool {
+        if memPool.addTransaction(transaction) {
+            broadcastTransaction(transaction)
+            return true
+        }
+        return false
+    }
+
+    func getBalance(_ address: String) -> Int {
+        return accountManager.getBalance(address)
+    }
+
+    func getPendingTransactions() -> [Transaction] {
+        return memPool.getAllPendingTransactions()
+    }
+
+    func isChainValid() -> Bool {
+        return blockchain.validateChain(blockchain.chain)
+    }
+
     // Connexion à un pair
     func connectToPeer(host: String) {
         let endpoint = NWEndpoint.hostPort(host: NWEndpoint.Host(host), port: port)
diff --git a/SwiftChain/main.swift b/SwiftChain/main.swift
index 09a8d1c..b3b90a3 100644
--- a/SwiftChain/main.swift
+++ b/SwiftChain/main.swift
@@ -9,7 +9,7 @@
 import Foundation
 
 let blockchain = Blockchain()
-let node = Node(blockchain: blockchain)
+let node = Node()
 var command: String?
 var currentMinerAddress = "MINER1" // Adresse par défaut du mineur
 var wallets: [String: Wallet] = [:]