Add signet

Author: 22388o

app/src/main/kotlin/org/example/App.kt

@@ -1,48 +1,187 @@
 /*
- * This source file was generated by the Gradle 'init' task
+ * This source file was generated by the Gradle 'init' task and then extended.
  */
 package org.example
 
-// A hypothetical Zero-Knowledge CoinJoin demonstration
+import java.security.MessageDigest
+
+// =====================
+// Blockchain Components
+// =====================
+
+data class Transaction(val from: String, val to: String, val amount: Double)
+
+data class Block(
+    val index: Int,
+    val previousHash: String,
+    val timestamp: Long,
+    val transactions: List<Transaction>,
+    var nonce: Int = 0
+) {
+    var hash: String = calculateHash()
+
+    fun calculateHash(): String {
+        val input = "$index$previousHash$timestamp$transactions$nonce"
+        return input.sha256()
+    }
+
+    fun mineBlock(difficulty: Int) {
+        val target = "0".repeat(difficulty)
+        while (!hash.startsWith(target)) {
+            nonce++
+            hash = calculateHash()
+        }
+        println("Block mined: $hash")
+    }
+}
+
+fun String.sha256(): String {
+    val bytes = this.toByteArray()
+    val md = MessageDigest.getInstance("SHA-256")
+    val digest = md.digest(bytes)
+    return digest.fold("") { str, it -> str + "%02x".format(it) }
+}
+
+class Blockchain(private val difficulty: Int = 4) {
+    val chain: MutableList<Block> = mutableListOf()
+    val pendingTransactions: MutableList<Transaction> = mutableListOf()
+    private val miningReward: Double = 50.0
+
+    init {
+        chain.add(createGenesisBlock())
+    }
+
+    private fun createGenesisBlock(): Block {
+        // Genesis block with a dummy transaction.
+        return Block(0, "0", System.currentTimeMillis(), listOf(Transaction("0", "Genesis", 0.0)))
+    }
+
+    fun getLatestBlock(): Block = chain.last()
+
+    fun addTransaction(transaction: Transaction) {
+        // In a real blockchain, you would include validations (e.g., digital signatures, balance checks).
+        pendingTransactions.add(transaction)
+    }
+
+    fun minePendingTransactions(miningRewardAddress: String) {
+        val block = Block(
+            index = chain.size,
+            previousHash = getLatestBlock().hash,
+            timestamp = System.currentTimeMillis(),
+            transactions = pendingTransactions.toList()
+        )
+        block.mineBlock(difficulty)
+        chain.add(block)
+        println("Block successfully mined and added to the chain!")
+
+        // Reward the miner by adding a new transaction.
+        pendingTransactions.clear()
+        pendingTransactions.add(Transaction("System", miningRewardAddress, miningReward))
+    }
+
+    fun isChainValid(): Boolean {
+        for (i in 1 until chain.size) {
+            val current = chain[i]
+            val previous = chain[i - 1]
+            if (current.hash != current.calculateHash()) {
+                return false
+            }
+            if (current.previousHash != previous.hash) {
+                return false
+            }
+        }
+        return true
+    }
+}
+
+// ========================
+// Mempool Signet Component
+// ========================
+
+class MempoolSignet {
+
+    // Placeholder: Simulate broadcasting a transaction to the Mempool Signet.
+    fun broadcastTransaction(transaction: String): String {
+        return "Transaction '$transaction' broadcasted to Mempool Signet."
+    }
+}
+
+// ========================================
+// Zero-Knowledge CoinJoin Demonstration
+// ========================================
+
 class ZKCoinJoin {
 
-    // Placeholder: Simulate adding participants to the CoinJoin process
+    // Placeholder: Simulate adding participants to the CoinJoin process.
     fun addParticipant(participant: String): String {
         return "Participant $participant added to the CoinJoin."
     }
 
-    // Placeholder: Simulate generating a Zero-Knowledge proof
+    // Placeholder: Simulate generating a Zero-Knowledge proof.
     fun generateProof(participant: String): String {
         return "Generated Zero-Knowledge proof for $participant."
     }
 
-    // Placeholder: Simulate the CoinJoin process
+    // Placeholder: Simulate the CoinJoin process.
     fun performCoinJoin(): String {
         return "CoinJoin completed using Zero-Knowledge proofs."
     }
+
+    // Placeholder: Simulate moving coins between two CoinJoin processes.
+    fun moveCoinsBetweenCoinjoins(source: String, destination: String, amount: Double): String {
+        return "Moved $amount coins from $source CoinJoin to $destination CoinJoin."
+    }
 }
 
 class App {
     val greeting: String
-        get() {
-            return "ZK Proof Coinjoin"
-        }
+        get() = "Blockchain and ZK Proof CoinJoin with Mempool Signet"
 }
 
+// ================
+// Main Application
+// ================
+
 fun main() {
+    // --- Blockchain Demonstration ---
+    println("=== Blockchain Demonstration ===")
+    val blockchain = Blockchain(difficulty = 3)  // Set a lower difficulty for quicker mining during tests.
+
+    // Add some transactions.
+    blockchain.addTransaction(Transaction("Alice", "Bob", 10.0))
+    blockchain.addTransaction(Transaction("Bob", "Charlie", 5.0))
+
+    // Mine the pending transactions.
+    blockchain.minePendingTransactions("Miner1")
+
+    // Display the blockchain's validity and its blocks.
+    println("Blockchain valid: ${blockchain.isChainValid()}")
+    println("Blockchain chain:")
+    blockchain.chain.forEach { println(it) }
+
+    // --- Zero-Knowledge CoinJoin & Mempool Signet Demonstration ---
+    println("\n=== Zero-Knowledge CoinJoin & Mempool Signet Demonstration ===")
     val zkCoinJoin = ZKCoinJoin()
+    val mempoolSignet = MempoolSignet()
 
-    // Add participants
+    // CoinJoin participant management.
     println(zkCoinJoin.addParticipant("Alice"))
     println(zkCoinJoin.addParticipant("Bob"))
 
-    // Generate proofs for participants
+    // Generate Zero-Knowledge proofs for the participants.
     println(zkCoinJoin.generateProof("Alice"))
     println(zkCoinJoin.generateProof("Bob"))
 
-    // Perform CoinJoin
+    // Execute the CoinJoin process.
     println(zkCoinJoin.performCoinJoin())
 
+    // Simulate moving coins between two CoinJoin instances.
+    println(zkCoinJoin.moveCoinsBetweenCoinjoins("Alice", "Bob", 5.0))
+
+    // Simulate broadcasting a transaction through the Mempool Signet.
+    val transaction = "Tx1234: Alice -> Bob, 5 coins"
+    println(mempoolSignet.broadcastTransaction(transaction))
+
+    // Display application greeting.
     println(App().greeting)
 }
-