Remove .xcuserstate file from git tracking

add some docs

.gitignore

@@ -0,0 +1,2 @@
+/.build
+*.xcuserstate

Blockchain.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>IDEDidComputeMac32BitWarning</key>
-	<true/>
-</dict>
-</plist>

Blockchain/main.swift

@@ -1,12 +0,0 @@
-//
-//  main.swift
-//  Blockchain
-//
-//  Created by Victor BODINAUD on 27/02/2020.
-//  Copyright © 2020 Victor BODINAUD. All rights reserved.
-//
-
-import Foundation
-
-print("Hello, World!")
-

SwiftChain.xcodeproj/project.pbxproj

@@ -3,15 +3,15 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 50;
+	objectVersion = 77;
 	objects = {
 
 /* Begin PBXBuildFile section */
-		B5E66EBD2407FDE000E89D17 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E66EBC2407FDE000E89D17 /* main.swift */; };
+		57BA298C2CF77907009E4448 /* CryptoSwift in Frameworks */ = {isa = PBXBuildFile; productRef = 57BA298B2CF77907009E4448 /* CryptoSwift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
-		B5E66EB72407FDE000E89D17 /* CopyFiles */ = {
+		57BA297E2CF778F5009E4448 /* CopyFiles */ = {
 			isa = PBXCopyFilesBuildPhase;
 			buildActionMask = 2147483647;
 			dstPath = /usr/share/man/man1/;
@@ -23,118 +23,127 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
-		B5E66EB92407FDE000E89D17 /* Blockchain */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Blockchain; sourceTree = BUILT_PRODUCTS_DIR; };
-		B5E66EBC2407FDE000E89D17 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
+		57BA29802CF778F5009E4448 /* SwiftChain */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = SwiftChain; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
+/* Begin PBXFileSystemSynchronizedRootGroup section */
+		57BA29822CF778F5009E4448 /* SwiftChain */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			path = SwiftChain;
+			sourceTree = "<group>";
+		};
+/* End PBXFileSystemSynchronizedRootGroup section */
+
 /* Begin PBXFrameworksBuildPhase section */
-		B5E66EB62407FDE000E89D17 /* Frameworks */ = {
+		57BA297D2CF778F5009E4448 /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				57BA298C2CF77907009E4448 /* CryptoSwift in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
-		B5E66EB02407FDE000E89D17 = {
+		57BA29772CF778F5009E4448 = {
 			isa = PBXGroup;
 			children = (
-				B5E66EBB2407FDE000E89D17 /* Blockchain */,
-				B5E66EBA2407FDE000E89D17 /* Products */,
+				57BA29822CF778F5009E4448 /* SwiftChain */,
+				57BA29812CF778F5009E4448 /* Products */,
 			);
 			sourceTree = "<group>";
 		};
-		B5E66EBA2407FDE000E89D17 /* Products */ = {
+		57BA29812CF778F5009E4448 /* Products */ = {
 			isa = PBXGroup;
 			children = (
-				B5E66EB92407FDE000E89D17 /* Blockchain */,
+				57BA29802CF778F5009E4448 /* SwiftChain */,
 			);
 			name = Products;
 			sourceTree = "<group>";
 		};
-		B5E66EBB2407FDE000E89D17 /* Blockchain */ = {
-			isa = PBXGroup;
-			children = (
-				B5E66EBC2407FDE000E89D17 /* main.swift */,
-			);
-			path = Blockchain;
-			sourceTree = "<group>";
-		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
-		B5E66EB82407FDE000E89D17 /* Blockchain */ = {
+		57BA297F2CF778F5009E4448 /* SwiftChain */ = {
 			isa = PBXNativeTarget;
-			buildConfigurationList = B5E66EC02407FDE000E89D17 /* Build configuration list for PBXNativeTarget "Blockchain" */;
+			buildConfigurationList = 57BA29872CF778F5009E4448 /* Build configuration list for PBXNativeTarget "SwiftChain" */;
 			buildPhases = (
-				B5E66EB52407FDE000E89D17 /* Sources */,
-				B5E66EB62407FDE000E89D17 /* Frameworks */,
-				B5E66EB72407FDE000E89D17 /* CopyFiles */,
+				57BA297C2CF778F5009E4448 /* Sources */,
+				57BA297D2CF778F5009E4448 /* Frameworks */,
+				57BA297E2CF778F5009E4448 /* CopyFiles */,
 			);
 			buildRules = (
 			);
 			dependencies = (
 			);
-			name = Blockchain;
-			productName = Blockchain;
-			productReference = B5E66EB92407FDE000E89D17 /* Blockchain */;
+			fileSystemSynchronizedGroups = (
+				57BA29822CF778F5009E4448 /* SwiftChain */,
+			);
+			name = SwiftChain;
+			packageProductDependencies = (
+				57BA298B2CF77907009E4448 /* CryptoSwift */,
+			);
+			productName = SwiftChain;
+			productReference = 57BA29802CF778F5009E4448 /* SwiftChain */;
 			productType = "com.apple.product-type.tool";
 		};
 /* End PBXNativeTarget section */
 
 /* Begin PBXProject section */
-		B5E66EB12407FDE000E89D17 /* Project object */ = {
+		57BA29782CF778F5009E4448 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastSwiftUpdateCheck = 1130;
-				LastUpgradeCheck = 1130;
-				ORGANIZATIONNAME = "Victor BODINAUD";
+				BuildIndependentTargetsInParallel = 1;
+				LastSwiftUpdateCheck = 1610;
+				LastUpgradeCheck = 1610;
 				TargetAttributes = {
-					B5E66EB82407FDE000E89D17 = {
-						CreatedOnToolsVersion = 11.3.1;
+					57BA297F2CF778F5009E4448 = {
+						CreatedOnToolsVersion = 16.1;
 					};
 				};
 			};
-			buildConfigurationList = B5E66EB42407FDE000E89D17 /* Build configuration list for PBXProject "Blockchain" */;
-			compatibilityVersion = "Xcode 9.3";
+			buildConfigurationList = 57BA297B2CF778F5009E4448 /* Build configuration list for PBXProject "SwiftChain" */;
 			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
 				Base,
 			);
-			mainGroup = B5E66EB02407FDE000E89D17;
-			productRefGroup = B5E66EBA2407FDE000E89D17 /* Products */;
+			mainGroup = 57BA29772CF778F5009E4448;
+			minimizedProjectReferenceProxies = 1;
+			packageReferences = (
+				57BA298A2CF77907009E4448 /* XCRemoteSwiftPackageReference "CryptoSwift" */,
+			);
+			preferredProjectObjectVersion = 77;
+			productRefGroup = 57BA29812CF778F5009E4448 /* Products */;
 			projectDirPath = "";
 			projectRoot = "";
 			targets = (
-				B5E66EB82407FDE000E89D17 /* Blockchain */,
+				57BA297F2CF778F5009E4448 /* SwiftChain */,
 			);
 		};
 /* End PBXProject section */
 
 /* Begin PBXSourcesBuildPhase section */
-		B5E66EB52407FDE000E89D17 /* Sources */ = {
+		57BA297C2CF778F5009E4448 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				B5E66EBD2407FDE000E89D17 /* main.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXSourcesBuildPhase section */
 
 /* Begin XCBuildConfiguration section */
-		B5E66EBE2407FDE000E89D17 /* Debug */ = {
+		57BA29852CF778F5009E4448 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
-				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_ENABLE_OBJC_WEAK = YES;
@@ -153,6 +162,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -163,7 +173,8 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
-				GCC_C_LANGUAGE_STANDARD = gnu11;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
@@ -177,24 +188,25 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 15.1;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 			};
 			name = Debug;
 		};
-		B5E66EBF2407FDE000E89D17 /* Release */ = {
+		57BA29862CF778F5009E4448 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
-				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_ENABLE_OBJC_WEAK = YES;
@@ -213,6 +225,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -223,7 +236,8 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				GCC_C_LANGUAGE_STANDARD = gnu11;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
@@ -231,16 +245,16 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 15.1;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;
-				SWIFT_OPTIMIZATION_LEVEL = "-O";
 			};
 			name = Release;
 		};
-		B5E66EC12407FDE000E89D17 /* Debug */ = {
+		57BA29882CF778F5009E4448 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
@@ -251,7 +265,7 @@
 			};
 			name = Debug;
 		};
-		B5E66EC22407FDE000E89D17 /* Release */ = {
+		57BA29892CF778F5009E4448 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
@@ -265,25 +279,44 @@
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
-		B5E66EB42407FDE000E89D17 /* Build configuration list for PBXProject "Blockchain" */ = {
+		57BA297B2CF778F5009E4448 /* Build configuration list for PBXProject "SwiftChain" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				B5E66EBE2407FDE000E89D17 /* Debug */,
-				B5E66EBF2407FDE000E89D17 /* Release */,
+				57BA29852CF778F5009E4448 /* Debug */,
+				57BA29862CF778F5009E4448 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		B5E66EC02407FDE000E89D17 /* Build configuration list for PBXNativeTarget "Blockchain" */ = {
+		57BA29872CF778F5009E4448 /* Build configuration list for PBXNativeTarget "SwiftChain" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				B5E66EC12407FDE000E89D17 /* Debug */,
-				B5E66EC22407FDE000E89D17 /* Release */,
+				57BA29882CF778F5009E4448 /* Debug */,
+				57BA29892CF778F5009E4448 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+
+/* Begin XCRemoteSwiftPackageReference section */
+		57BA298A2CF77907009E4448 /* XCRemoteSwiftPackageReference "CryptoSwift" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/krzyzanowskim/CryptoSwift.git";
+			requirement = {
+				kind = upToNextMajorVersion;
+				minimumVersion = 1.8.3;
 			};
-	rootObject = B5E66EB12407FDE000E89D17 /* Project object */;
+		};
+/* End XCRemoteSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		57BA298B2CF77907009E4448 /* CryptoSwift */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = 57BA298A2CF77907009E4448 /* XCRemoteSwiftPackageReference "CryptoSwift" */;
+			productName = CryptoSwift;
+		};
+/* End XCSwiftPackageProductDependency section */
+	};
+	rootObject = 57BA29782CF778F5009E4448 /* Project object */;
 }

SwiftChain.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -2,6 +2,6 @@
 <Workspace
    version = "1.0">
    <FileRef
-      location = "self:Blockchain.xcodeproj">
+      location = "self:">
    </FileRef>
 </Workspace>

SwiftChain.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -0,0 +1,15 @@
+{
+  "originHash" : "72c2bbc73844ab67fc7d9913c0750200cb8c2703ae8ac776acd11affc367875c",
+  "pins" : [
+    {
+      "identity" : "cryptoswift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/krzyzanowskim/CryptoSwift.git",
+      "state" : {
+        "revision" : "678d442c6f7828def400a70ae15968aef67ef52d",
+        "version" : "1.8.3"
+      }
+    }
+  ],
+  "version" : 3
+}

SwiftChain.xcodeproj/xcuserdata/victor.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -4,7 +4,7 @@
 <dict>
 	<key>SchemeUserState</key>
 	<dict>
-		<key>Blockchain.xcscheme_^#shared#^_</key>
+		<key>SwiftChain.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
 			<integer>0</integer>

SwiftChain/Models/Account.swift

@@ -0,0 +1,18 @@
+//
+//  File.swift
+//  
+//
+//  Created by Victor BODINAUD on 31/03/2021.
+//
+
+import Foundation
+
+class Account {
+    var id: String
+    var balance: Int
+    
+    init(id: String, balance: Int) {
+        self.id = id
+        self.balance = balance
+    }
+}

SwiftChain/Models/Block.swift

@@ -0,0 +1,59 @@
+//
+//  Block.swift
+//  Blockchain
+//
+//  Created by Victor BODINAUD on 27/02/2020.
+//  Copyright © 2020 Victor BODINAUD. All rights reserved.
+//
+
+import Foundation
+import CryptoSwift
+
+class Block {
+    var hash: String
+    var data: String
+    var previousHash: String
+    var index: Int
+    var nonce: Int
+    var timestamp: Int
+    
+    /**
+        Initialize a block with the provided parts and specifications.
+     
+        - parameters:
+            - hash: The hash of the block
+            - data: The data of the block
+            - previousHash: The hash of the previous block
+            - index: The index of the block
+            - nonce: The nonce of the block
+            - timestamp: The timestamp of the block
+     
+        - returns: A beautiful new block for the blockchain.
+     */
+    init(hash: String = "", data: String = "", previousHash: String = "", index: Int = 0, nonce: Int = 0, timestamp: Int = 0) {
+        self.data = data
+        self.previousHash = previousHash
+        self.index = index
+        self.nonce = nonce
+        self.timestamp = timestamp
+        self.hash = hash
+    }
+    
+    /**
+        Generate the hash of the block.
+     
+        - returns: The hash of the block
+     */
+    func generateHash() -> String {
+        return data.sha256()
+    }
+    
+    /**
+        Generate the timestamp of the block
+     
+        - returns: The timestamp of the block
+     */
+    func generateTimestamp() -> Int {
+        return Int(Date().timeIntervalSince1970)
+    }
+}

SwiftChain/Models/Blockchain.swift

@@ -0,0 +1,88 @@
+//
+//  Blockchain.swift
+//  Blockchain
+//
+//  Created by Victor BODINAUD on 27/02/2020.
+//  Copyright © 2020 Victor BODINAUD. All rights reserved.
+//
+
+import Foundation
+
+class Blockchain {
+    var chain = [Block]()
+    
+    /**
+        Initialize the first block of the blockchain.
+        
+        - Parameters:
+            - data: The datas of the block
+     */
+    func createGenesisBlock(data: String) {
+        let genesisBlock = Block()
+        genesisBlock.data = data
+        genesisBlock.previousHash = "0000"
+        genesisBlock.index = 0
+        genesisBlock.nonce = 0
+        genesisBlock.timestamp = genesisBlock.generateTimestamp()
+        genesisBlock.hash = genesisBlock.generateHash()
+        chain.append(genesisBlock)
+        print("Genesis block created -- hash: \(genesisBlock.hash)")
+    }
+    
+    /**
+        Initialize a new block of the blockchain.
+     
+        - Parameters:
+            - data: The datas of the block
+     */
+    func createBlock(data: String) {
+        let newBlock = Block()
+        newBlock.data = data
+        newBlock.previousHash = chain.last!.hash
+        newBlock.index = chain.count
+        newBlock.nonce = 0
+        newBlock.timestamp = newBlock.generateTimestamp()
+        newBlock.hash = newBlock.generateHash()
+        chain.append(newBlock)
+        
+        print("-- Block \(newBlock.index) created --\n hash: \(newBlock.hash)\n previous hash: \(newBlock.previousHash)\n data: \(newBlock.data)")
+    }
+    
+    /**
+        Insert a corrupted block in the blockhain.
+        (for testing purpose)
+     */
+    func insertCorruptedBlock() {
+        let newCorruptedBlock = Block()
+        newCorruptedBlock.data = "Corrupted block"
+        newCorruptedBlock.previousHash = "1234567890"
+        newCorruptedBlock.index = chain.count
+        newCorruptedBlock.nonce = 0
+        newCorruptedBlock.timestamp = newCorruptedBlock.generateTimestamp()
+        newCorruptedBlock.hash = newCorruptedBlock.generateHash()
+        chain.append(newCorruptedBlock)
+        
+        print("-- Corrupted block \(newCorruptedBlock.index) created --\n hash: \(newCorruptedBlock.hash)\n previous hash: \(newCorruptedBlock.previousHash)\n data: \(newCorruptedBlock.data)")
+    }
+    
+    /**
+        Check validity of the blockchain.
+     */
+    func chainValidity() {
+        var isChainValid = true
+        var corruptedBlock = Block()
+        
+        for i in 1...chain.count-1 {
+            if chain[i].previousHash != chain[i-1].hash {
+                isChainValid = false
+                corruptedBlock = chain[i]
+            }
+        }
+        
+        print("Chain is valid : \(isChainValid)")
+        
+        if !isChainValid {
+            print("Corrupted block is : \(corruptedBlock.index)")
+        }
+    }
+}

SwiftChain/Models/Transaction.swift

@@ -0,0 +1,22 @@
+//
+//  File.swift
+//  
+//
+//  Created by Victor BODINAUD on 31/03/2021.
+//
+
+import Foundation
+
+class Transaction {
+    var sender: String
+    var receiver: String
+    var amount: Int
+    var type: String
+    
+    init(sender: String, receiver: String, amount: Int, type: String) {
+        self.sender = sender
+        self.receiver = receiver
+        self.amount = amount
+        self.type = type
+    }
+}

SwiftChain/main.swift

@@ -0,0 +1,44 @@
+//
+//  main.swift
+//  Blockchain
+//
+//  Created by Victor BODINAUD on 27/02/2020.
+//  Copyright © 2020 Victor BODINAUD. All rights reserved.
+//
+
+import Foundation
+
+let blockchain = Blockchain()
+var command: String?
+
+blockchain.createGenesisBlock(data: "")
+
+repeat {
+    print("Enter command:")
+    command = readLine()
+    
+    // Create a new block
+    if command == "create" {
+        print("data for the new block:")
+        let data = readLine()
+        blockchain.createBlock(data: data ?? "")
+    }
+    
+    // Create a lot of blocks
+    if command == "spam" {
+        for _ in 1...1000 {
+            blockchain.createBlock(data: "\((blockchain.chain.last?.index ?? 0)+1)")
+        }
+    }
+    
+    // Check validity of the blockchain
+    if command == "validity" {
+        blockchain.chainValidity()
+    }
+    
+    // Insert a corrupted block
+    if command == "corrupt" {
+        blockchain.insertCorruptedBlock()
+    }
+    
+} while command != "exit"