import EpicChainSwift import Combine // Configure your EpicChain node connection let config = EpicChainSwiftConfig( networkMagic: 769, // MainNet magic number timeout: 30, // Request timeout in seconds retryCount: 3 // Automatic retry attempts ) // Initialize the core service let nodeURL = URL(string: "https://mainnet1-seed.epic-chain.org:10111")! let httpService = HttpService( url: nodeURL, configuration: .default, sessionDelegate: nil ) let epicchainSwift = EpicChainSwift.build(httpService, config) // Enable performance optimizations HashCache.shared.maxCacheSize = 10000 HashCache.shared.compressionEnabled = true // Set up security parameters SecurityConfiguration.enableMemoryProtection() SecurityConfiguration.setAutoZeroingInterval(5.0) // Zero sensitive data every 5 seconds

// 1. Create or import an account securely let account: Account do { // For production: Use SecureECKeyPair and proper key derivation account = try Account.createNewAccount() .label("My First Account") .securedWith(keychainService: "com.yourapp.epicchain") } catch { print("Failed to create account: \(error)") return } // 2. Build a simple contract call let script: Bytes do { script = try ScriptBuilder() .contractCall( EpicChainToken.SCRIPT_HASH, method: "balanceOf", params: [ContractParameter.hash160(account.getScriptHash())] ) .toArray() } catch { print("Failed to build script: \(error)") return } // 3. Create, sign, and send transaction Task { do { let transaction = try await TransactionBuilder(epicchainSwift) .script(script) .signers(AccountSigner.calledByEntry(account)) .systemFee(1000000) // Appropriate system fee .networkFee(500000) // Network fee for priority .validUntilBlock(/* calculated block */) .sign() let response = try await transaction.send() print("""  ✅ Transaction Successful!  - Hash: \(response.hash)  - Network Fee: \(response.networkFee)  - System Fee: \(response.systemFee)  """) // Track confirmation try transaction.track() .sink(receiveCompletion: { completion in if case .failure(let error) = completion { print("Tracking failed: \(error)") } }, receiveValue: { blockIndex in print("🎉 Transaction confirmed in block #\(blockIndex)") }) .store(in: &cancellables) } catch { print("Transaction failed: \(error)") } }

// swift-tools-version:5.9 import PackageDescription let package = Package( name: "YourProject", platforms: [ .iOS(.v13), .macOS(.v10_15), .tvOS(.v13), .watchOS(.v6) ], products: [ .library( name: "YourLibrary", targets: ["YourTarget"]), ], dependencies: [ .package( url: "https://github.com/epicchainlabs/epicchain-swift.git", from: "2.0.0" ), // Optional: Additional security dependencies .package( url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "1.6.0" ) ], targets: [ .target( name: "YourTarget", dependencies: [ .product(name: "EpicChainSwift", package: "epicchain-swift"), .product(name: "CryptoSwift", package: "CryptoSwift") // Optional ], resources: [ .process("Resources") ] ), .testTarget( name: "YourTargetTests", dependencies: ["YourTarget"] ) ] )

import EpicChainSwift import EpicChainSwiftCrypto // Optional crypto utilities

import EpicChainSwift // Basic configuration for MainNet let basicConfig = EpicChainSwiftConfig( networkMagic: 769, // MainNet timeout: 30.0 ) // Advanced configuration for private network let advancedConfig = EpicChainSwiftConfig( networkMagic: 123456, // Private network magic timeout: 60.0, retryCount: 5, enableCompression: true, cachePolicy: .aggressive, securityLevel: .high ) // TestNet configuration let testNetConfig = EpicChainSwiftConfig.testNet()

// Configure multiple nodes for failover let primaryService = HttpService(url: URL(string: "https://node1.epic-chain.org:10111")!) let secondaryService = HttpService(url: URL(string: "https://node2.epic-chain.org:10111")!) let multiNodeConfig = EpicChainSwiftConfig( services: [primaryService, secondaryService], selectionStrategy: .roundRobin, // or .failover, .random healthCheckInterval: 300, // Health check every 5 minutes timeout: 30.0 ) let epicchainSwift = EpicChainSwift.build(multiNodeConfig)

// Configure security settings before any operations SecurityConfiguration.configure { $0.enableSecureMemory = true $0.autoZeroingEnabled = true $0.autoZeroingInterval = 5.0 $0.maxKeyInMemoryTime = 30.0 // Maximum time keys stay in memory $0.enableTimingAttackProtection = true $0.secureEnclaveAvailable = true // Use Secure Enclave when available } // Enable additional security features try SecurityManager.shared.enableFeatures([ .memoryProtection, .keyIsolation, .transactionVerification, .maliciousContractDetection ])

// Understanding the basic components public struct BlockchainState { let height: Int let timestamp: Date let validators: [Validator] let network: NetworkType } // Network types public enum NetworkType { case mainNet case testNet case privateNet(magic: Int) case custom(name: String, magic: Int) } // Getting blockchain state Task { let state = try await epicchainSwift.getBlockchainState() print("Current height: \(state.height)") print("Block timestamp: \(state.timestamp)") }

// Understanding EpicChain addresses public struct EpicChainAddress { let scriptHash: Hash160 let address: String let version: UInt8 // Create from script hash static func fromScriptHash(_ hash: Hash160) throws -> EpicChainAddress // Create from string address static func fromString(_ address: String) throws -> EpicChainAddress // Validate address format static func isValid(_ address: String) -> Bool } // Address usage examples let scriptHash = try Hash160("0x1a70eac53f5882e40dd90f55463cce31a9f72cd4") let address = try EpicChainAddress.fromScriptHash(scriptHash) print("Script Hash: \(address.scriptHash)") print("Address: \(address.address)") print("Version: \(address.version)")

// Different hash types in EpicChain let hash160 = try Hash160("0x1a70eac53f5882e40dd90f55463cce31a9f72cd4") let hash256 = try Hash256("da5a53a79ac399e07c6eea366c192a4942fa930d6903ffc10b497f834a538fee") // Hash operations let combinedHash = try Hash256.concat(hash160, hash256) let checksum = hash256.checksum() let isValid = hash160.validateFormat()

// Advanced connection management public class ConnectionManager { private let epicchainSwift: EpicChainSwift private var healthChecker: NodeHealthChecker? private var reconnectTimer: Timer? init(config: EpicChainSwiftConfig) { self.epicchainSwift = EpicChainSwift.build(config) setupHealthMonitoring() setupReconnectionLogic() } private func setupHealthMonitoring() { healthChecker = NodeHealthChecker(epicchainSwift: epicchainSwift) healthChecker?.onHealthStatusChange = { [weak self] status in self?.handleHealthStatus(status) } healthChecker?.startMonitoring(interval: 60) // Check every minute } } // Usage let connectionManager = ConnectionManager(config: multiNodeConfig)

// Comprehensive block monitoring public class BlockMonitor { private let epicchainSwift: EpicChainSwift private var blockSubscription: AnyCancellable? private var currentHeight: Int = 0 init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift startMonitoring() } func startMonitoring() { // First, get current height Task { do { let state = try await epicchainSwift.getBlockchainState() currentHeight = state.height // Subscribe to new blocks blockSubscription = epicchainSwift.subscribeToNewBlocksPublisher(true) .sink(receiveCompletion: { [weak self] completion in self?.handleSubscriptionCompletion(completion) }, receiveValue: { [weak self] blockResult in self?.handleNewBlock(blockResult) }) } catch { print("Failed to start monitoring: \(error)") } } } private func handleNewBlock(_ blockResult: BlockRequestResult) { guard let block = blockResult.block else { return } print("""  📦 New Block #\(block.index)  - Hash: \(block.hash)  - Timestamp: \(Date(timeIntervalSince1970: Double(block.time)))  - Transactions: \(block.transactions?.count ?? 0)  - Confirmations: \(block.confirmations)  """) // Process transactions in the block if let transactions = block.transactions { for transaction in transactions { processTransaction(transaction) } } currentHeight = block.index } }

// Advanced transaction analysis public class TransactionAnalyzer { let epicchainSwift: EpicChainSwift init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift } func analyzeTransaction(_ hash: Hash256) async throws -> TransactionAnalysis { // Get basic transaction data let txResponse = try await epicchainSwift.getTransaction(hash).send() guard let transaction = txResponse.transaction else { throw AnalysisError.transactionNotFound } // Get application logs let appLogResponse = try await epicchainSwift.getApplicationLog(hash).send() // Get raw transaction data let rawResponse = try await epicchainSwift.getRawTransaction(hash).send() return TransactionAnalysis( transaction: transaction, applicationLog: appLogResponse.applicationLog, rawData: rawResponse.rawTransaction ) } func verifyTransaction(_ hash: Hash256) async throws -> VerificationResult { let analysis = try await analyzeTransaction(hash) return VerificationResult( isValid: analysis.transaction.verify(), executionState: analysis.applicationLog?.executions.first?.state ?? .halt, gasConsumed: analysis.applicationLog?.executions.first?.gasConsumed ?? 0, notifications: analysis.applicationLog?.executions.first?.notifications ?? [] ) } }

// Secure wallet management on node public class NodeWalletManager { private let epicchainSwift: EpicChainSwift private let security: SecurityManager init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.security = SecurityManager.shared } // Open wallet with secure session func openWalletSecurely(path: String, password: String) async throws -> WalletSession { // First, validate the wallet file try validateWalletFile(path) // Open wallet on node let openResponse = try await epicchainSwift.openWallet(path, password).send() guard openResponse.openWallet == true else { throw WalletError.failedToOpen } // Create secure session let session = try WalletSession( walletPath: path, node: epicchainSwift, security: security ) // Set up automatic closure setupAutoClose(session: session) return session } // Get wallet balances with caching func getWalletBalances(_ tokens: [Hash160]? = nil) async throws -> [TokenBalance] { let tokensToCheck = tokens ?? [EpicChainToken.SCRIPT_HASH] var balances: [TokenBalance] = [] for token in tokensToCheck { let response = try await epicchainSwift.getWalletBalance(token).send() if let balance = response.walletBalance?.balance { balances.append(TokenBalance(token: token, balance: balance)) } } return balances } }

// Comprehensive wallet management public class WalletManager { private let security: SecurityManager init() { self.security = SecurityManager.shared } // Create a new secure wallet func createSecureWallet( name: String, password: String, securityLevel: SecurityLevel = .high ) throws -> Wallet { // Generate secure accounts let accounts = try generateSecureAccounts(count: 1, securityLevel: securityLevel) // Create wallet with security features let wallet = try Wallet.withAccounts(accounts) .name(name) .version("1.0") .securedWith(securityLevel: securityLevel) // Encrypt wallet data let encryptedWallet = try encryptWalletData(wallet, password: password) return encryptedWallet } // Import wallet from various formats func importWallet(from source: WalletSource) throws -> Wallet { switch source { case .xep6File(let url): return try Wallet.fromXEP6Wallet(url) .securedWith(securityLevel: .standard) case .privateKey(let keyData): let account = try Account.fromPrivateKey(keyData) return try Wallet.withAccounts([account]) case .mnemonic(let phrase, let passphrase): let accounts = try recoverAccountsFromMnemonic(phrase, passphrase: passphrase) return try Wallet.withAccounts(accounts) case .keyStoreJSON(let jsonData): return try decodeKeyStoreJSON(jsonData) } } } // Wallet source types public enum WalletSource { case xep6File(URL) case privateKey(Data) case mnemonic([String], passphrase: String?) case keyStoreJSON(Data) }

// Advanced account management public class AccountManager { private let security: SecurityManager init() { self.security = SecurityManager.shared } // Create account with specific parameters func createAccount( type: AccountType = .standard, security: AccountSecurity = .default, label: String? = nil ) throws -> Account { switch type { case .standard: let keyPair = try SecureECKeyPair.createEcKeyPair() return try Account.fromKeyPair(keyPair) .label(label ?? "Account \(Date())") .securedWith(security: security) case .multiSig(let publicKeys, let signingThreshold): return try Account.createMultiSigAccount(publicKeys, signingThreshold) .label(label ?? "MultiSig Account") case .contract(let contractHash): return try Account.fromContract(contractHash) .label(label ?? "Contract Account") } } // Import account from various formats func importAccount(from source: AccountSource) throws -> Account { switch source { case .wif(let wifString): return try Account.fromWIF(wifString) .securedWith(security: .high) case .encryptedKey(let encryptedData, let password): let decryptedKey = try security.decryptPrivateKey(encryptedData, password: password) return try Account.fromPrivateKey(decryptedKey) case .hardwareWallet(let publicKey): return try Account.fromPublicKey(publicKey, isHardware: true) case .keyStore(let keyStore): return try importFromKeyStore(keyStore) } } } // Account types and security levels public enum AccountType { case standard case multiSig(publicKeys: [ECPublicKey], signingThreshold: Int) case contract(scriptHash: Hash160) } public struct AccountSecurity { let keyStorage: KeyStorage let autoLockTimeout: TimeInterval let requireBiometric: Bool let maxMemoryTime: TimeInterval static let `default` = AccountSecurity( keyStorage: .keychain, autoLockTimeout: 300, requireBiometric: false, maxMemoryTime: 30 ) static let high = AccountSecurity( keyStorage: .secureEnclave, autoLockTimeout: 60, requireBiometric: true, maxMemoryTime: 10 ) }

// Advanced multi-signature account management public class MultiSigManager { // Create complex multi-sig account func createAdvancedMultiSigAccount( participants: [MultiSigParticipant], signingRules: SigningRules, label: String ) throws -> Account { let publicKeys = participants.map { $0.publicKey } let threshold = signingRules.requiredSignatures // Create the base multi-sig account let account = try Account.createMultiSigAccount(publicKeys, threshold) .label(label) // Add metadata about participants and rules let metadata = MultiSigMetadata( participants: participants, rules: signingRules, creationDate: Date(), version: "2.0" ) return try account.withMetadata(metadata) } // Coordinate multi-sig transaction signing func coordinateSigning( transaction: Transaction, participants: [Account], coordinator: Account ) async throws -> SignedTransaction { var signedTransaction = transaction // Coordinator signs first signedTransaction = try await signedTransaction.sign(with: coordinator) // Distribute to participants for signing for participant in participants { // In real implementation, this would be distributed signedTransaction = try await signedTransaction.sign(with: participant) } // Verify we have enough signatures try verifySignatures(signedTransaction, required: participants.count + 1) return signedTransaction } } // Multi-signature data structures public struct MultiSigParticipant { let publicKey: ECPublicKey let weight: Int let role: String let contactInfo: String? } public struct SigningRules { let requiredSignatures: Int let maxTransactionValue: Int? let allowedOperations: [ContractOperation] let expirationTime: TimeInterval? }

// Comprehensive balance management public class BalanceManager { private let epicchainSwift: EpicChainSwift private let cache: BalanceCache init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.cache = BalanceCache() } // Get comprehensive balance information func getCompleteBalances(for account: Account) async throws -> AccountBalances { // Check cache first if let cached = cache.getBalances(for: account.getScriptHash()) { return cached } // Fetch XEP-17 token balances let xep17Balances = try await account.getXEP17Balances(epicchainSwift) // Fetch XEP-11 NFT balances let xep11Balances = try await getXEP11Balances(for: account) // Get EpicChain token balance separately let epicchainBalance = try await getEpicChainBalance(for: account) // Get unclaimed rewards let unclaimed = try await getUnclaimedRewards(for: account) let balances = AccountBalances( epicchain: epicchainBalance, xep17Tokens: xep17Balances, xep11Tokens: xep11Balances, unclaimedRewards: unclaimed, lastUpdated: Date() ) // Cache the results cache.store(balances, for: account.getScriptHash()) return balances } // Monitor balance changes in real-time func monitorBalanceChanges(for account: Account) -> AnyPublisher<BalanceUpdate, Never> { return BalanceMonitor(account: account, epicchainSwift: epicchainSwift) .balanceUpdates .eraseToAnyPublisher() } } // Balance data structures public struct AccountBalances { let epicchain: TokenBalance let xep17Tokens: [TokenBalance] let xep11Tokens: [NFTBalance] let unclaimedRewards: Int let lastUpdated: Date var totalValue: Int { // Calculate total value in EpicChain (simplified) return epicchain.balance + xep17Tokens.reduce(0) { $0 + $1.balance } } } public struct BalanceUpdate { let account: Hash160 let token: Hash160 let oldBalance: Int let newBalance: Int let change: Int let blockIndex: Int }

// Advanced transaction builder public class AdvancedTransactionBuilder { private let epicchainSwift: EpicChainSwift private var builder: TransactionBuilder private var security: SecurityManager init(epicchainSwift: EpicChainSwift, security: SecurityManager = .shared) { self.epicchainSwift = epicchainSwift self.builder = TransactionBuilder(epicchainSwift) self.security = security } // Build complex contract invocation func buildContractInvocation( contractHash: Hash160, method: String, parameters: [ContractParameter], signers: [Signer], options: TransactionOptions = .default ) async throws -> TransactionBuilder { // Build the script let script = try ScriptBuilder() .contractCall(contractHash, method: method, params: parameters) .toArray() // Configure the transaction builder = builder .script(script) .signers(signers) .systemFee(options.systemFee) .networkFee(options.networkFee) .validUntilBlock(try await calculateValidUntilBlock()) // Add security features if options.requireConfirmation { builder = builder.addConfirmationRequirement() } if options.enableTracking { builder = builder.enableTransactionTracking() } return builder } // Build asset transfer transaction func buildAssetTransfer( from: Account, to: Hash160, asset: Hash160, amount: Int, options: TransferOptions = .default ) async throws -> TransactionBuilder { let script = try ScriptBuilder() .assetTransfer(asset, from: from.getScriptHash(), to: to, amount: amount) .toArray() return try await buildContractInvocation( contractHash: asset, method: "transfer", parameters: [ ContractParameter.hash160(from.getScriptHash()), ContractParameter.hash160(to), ContractParameter.integer(amount), ContractParameter.any(options.data) ], signers: [AccountSigner.calledByEntry(from)], options: options.transactionOptions ) } } // Transaction options public struct TransactionOptions { let systemFee: Int let networkFee: Int let requireConfirmation: Bool let enableTracking: Bool let priority: TransactionPriority let customData: Data? static let `default` = TransactionOptions( systemFee: 1000000, networkFee: 0, requireConfirmation: false, enableTracking: true, priority: .medium, customData: nil ) } public enum TransactionPriority { case low // Lower fees, slower confirmation case medium // Balanced fees and speed case high // Higher fees, faster confirmation }

// Secure transaction signing manager public class SigningManager { private let security: SecurityManager private let keyStorage: KeyStorage init(security: SecurityManager = .shared, keyStorage: KeyStorage = .keychain) { self.security = security self.keyStorage = keyStorage } // Sign transaction with security checks func signTransaction( _ transaction: Transaction, with account: Account, context: SigningContext ) async throws -> SignedTransaction { // Pre-signing security checks try await performSecurityChecks(transaction, account: account, context: context) // Verify transaction details with user if required if context.requiresUserVerification { try await verifyWithUser(transaction, context: context) } // Get signing key based on storage type let signingKey = try await getSigningKey(for: account) // Perform the actual signing let signedTx = try await transaction.sign(with: signingKey) // Post-signing security actions try await recordSigningEvent(signedTx, account: account, context: context) return signedTx } // Multi-signature coordination func coordinateMultiSigSigning( transaction: Transaction, participants: [Account], coordinator: Account ) async throws -> SignedTransaction { var signedTransaction = transaction // Coordinator signs first signedTransaction = try await signTransaction( signedTransaction, with: coordinator, context: SigningContext.multiSigCoordinator ) // Create signing package for participants let signingPackage = try createSigningPackage(signedTransaction, participants: participants) // In real implementation, distribute to participants for participant in participants { let participantSignature = try await distributeForSigning( signingPackage, to: participant ) signedTransaction = try signedTransaction.addSignature(participantSignature) } return signedTransaction } } // Signing context for security public struct SigningContext { let purpose: SigningPurpose let requiresUserVerification: Bool let securityLevel: SecurityLevel let allowedContracts: [Hash160]? let maxValue: Int? static let standard = SigningContext( purpose: .contractInteraction, requiresUserVerification: false, securityLevel: .standard, allowedContracts: nil, maxValue: nil ) static let multiSigCoordinator = SigningContext( purpose: .multiSignature, requiresUserVerification: true, securityLevel: .high, allowedContracts: nil, maxValue: nil ) } public enum SigningPurpose { case assetTransfer case contractInteraction case voting case multiSignature case accountManagement }

// Comprehensive transaction tracking public class TransactionTracker { private let epicchainSwift: EpicChainSwift private let storage: TransactionStorage private var monitors: [Hash256: TransactionMonitor] = [:] init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.storage = TransactionStorage() } // Track transaction with comprehensive monitoring func trackTransaction( _ transactionHash: Hash256, options: TrackingOptions = .default ) -> AnyPublisher<TransactionStatus, TrackingError> { return TransactionMonitor( transactionHash: transactionHash, epicchainSwift: epicchainSwift, options: options ) .statusUpdates .handleEvents( receiveSubscription: { [weak self] _ in self?.startMonitoring(transactionHash) }, receiveCompletion: { [weak self] _ in self?.stopMonitoring(transactionHash) }, receiveCancel: { [weak self] in self?.stopMonitoring(transactionHash) } ) .eraseToAnyPublisher() } // Batch transaction tracking func trackMultipleTransactions( _ hashes: [Hash256] ) -> AnyPublisher<[TransactionStatus], Never> { let publishers = hashes.map { trackTransaction($0) } return Publishers.MergeMany(publishers) .collect() .eraseToAnyPublisher() } } // Transaction status and tracking public enum TransactionStatus { case pending // Submitted to network, not in block case confirmed(blockIndex: Int, confirmations: Int) case failed(error: TransactionError) case expired // Not confirmed before validUntilBlock case orphaned // Removed from chain due to reorganization } public struct TrackingOptions { let checkInterval: TimeInterval let timeout: TimeInterval let requireFinality: Bool let notifyOnStatusChange: Bool static let `default` = TrackingOptions( checkInterval: 10.0, timeout: 3600.0, // 1 hour requireFinality: false, notifyOnStatusChange: true ) static let aggressive = TrackingOptions( checkInterval: 5.0, timeout: 1800.0, // 30 minutes requireFinality: true, notifyOnStatusChange: true ) }

// Advanced smart contract interaction public class ContractManager { private let epicchainSwift: EpicChainSwift private let abiCache: ABICache init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.abiCache = ABICache() } // Deploy a new contract func deployContract( nefFile: NefFile, manifest: ContractManifest, deployer: Account, options: DeploymentOptions = .default ) async throws -> DeploymentResult { let contractManagement = ContractManagement(epicchainSwift) let transaction = try await contractManagement .deploy(nefFile, manifest) .signers(AccountSigner.calledByEntry(deployer)) .systemFee(options.systemFee) .networkFee(options.networkFee) .sign() let response = try await transaction.send() // Wait for deployment confirmation let deploymentReceipt = try await waitForDeploymentConfirmation(response.hash) return DeploymentResult( transactionHash: response.hash, contractHash: deploymentReceipt.contractHash, blockIndex: deploymentReceipt.blockIndex, gasCost: deploymentReceipt.gasCost ) } // Call contract method with complex parameters func callContractMethod( contractHash: Hash160, method: String, parameters: [ContractParameter], signers: [Signer], options: InvocationOptions = .default ) async throws -> InvocationResult { let contract = SmartContract(scriptHash: contractHash, epicchainSwift: epicchainSwift) // Get ABI for method validation let abi = try await getContractABI(contractHash) try validateMethodCall(abi, method: method, parameters: parameters) // Build and send invocation let transaction = try await contract .invokeFunction(method, parameters) .signers(signers) .systemFee(options.systemFee) .networkFee(options.networkFee) .sign() let response = try await transaction.send() return InvocationResult( transactionHash: response.hash, executionState: .pending, // Will be updated when confirmed gasConsumed: 0, // Will be updated from application log notifications: [] ) } // Test contract call without sending transaction func testContractCall( contractHash: Hash160, method: String, parameters: [ContractParameter], signers: [Signer] = [] ) async throws -> TestInvocationResult { let contract = SmartContract(scriptHash: contractHash, epicchainSwift: epicchainSwift) let result = try await contract.callInvokeFunction( method, parameters, signers ) return TestInvocationResult( stack: result.stack, gasConsumed: result.gasConsumed, state: result.state, exception: result.exception ) } } // Contract deployment and invocation structures public struct DeploymentOptions { let systemFee: Int let networkFee: Int let requireConfirmation: Bool let storageProperties: [StorageProperty]? static let `default` = DeploymentOptions( systemFee: 10000000, // Higher fee for deployment networkFee: 0, requireConfirmation: true, storageProperties: nil ) } public struct InvocationOptions { let systemFee: Int let networkFee: Int let feeCalculation: FeeCalculation let retryOnFailure: Bool static let `default` = InvocationOptions( systemFee: 0, // Calculate automatically networkFee: 0, feeCalculation: .automatic, retryOnFailure: true ) } public enum FeeCalculation { case automatic case fixed(amount: Int) case estimated(multiplier: Double) }

// Tools for contract development and testing public class ContractDevelopmentTools { private let epicchainSwift: EpicChainSwift init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift } // Simulate contract execution environment func createTestEnvironment( contracts: [DeployedContract], initialState: TestChainState = .default ) -> TestEnvironment { return TestEnvironment( epicchainSwift: epicchainSwift, contracts: contracts, initialState: initialState ) } // Generate contract ABI from source code analysis func generateABIFromSource( _ sourceCode: String, contractName: String ) throws -> ContractABI { let parser = SourceCodeParser() let ast = try parser.parse(sourceCode) let abiGenerator = ABIGenerator(ast: ast) return try abiGenerator.generateABI(for: contractName) } // Validate contract manifest func validateManifest(_ manifest: ContractManifest) -> [ValidationIssue] { var issues: [ValidationIssue] = [] // Check supported standards if !manifest.supportedStandards.contains("XEP-17") { issues.append(.warning("Contract does not declare XEP-17 support")) } // Check permissions for permission in manifest.permissions { if permission.contract == .wildcard && permission.methods == .wildcard { issues.append(.critical("Overly permissive contract permission")) } } // Check trust relationships if manifest.trusts.contains(.wildcard) { issues.append(.warning("Contract trusts all other contracts")) } return issues } } // Test environment for contract development public class TestEnvironment { let epicchainSwift: EpicChainSwift let contracts: [DeployedContract] let initialState: TestChainState init(epicchainSwift: EpicChainSwift, contracts: [DeployedContract], initialState: TestChainState) { self.epicchainSwift = epicchainSwift self.contracts = contracts self.initialState = initialState } // Execute test scenario func executeScenario(_ scenario: TestScenario) async throws -> ScenarioResult { let executor = ScenarioExecutor(environment: self) return try await executor.execute(scenario) } // Deploy test contract func deployTestContract( nefFile: NefFile, manifest: ContractManifest ) async throws -> DeployedContract { let testAccount = try Account.createNewAccount() // Test account with funds let deployment = try await ContractManagement(epicchainSwift) .deploy(nefFile, manifest) .signers(AccountSigner.calledByEntry(testAccount)) .sign() .send() return DeployedContract( hash: try await getContractHash(deployment.hash), manifest: manifest, deploymentTransaction: deployment.hash ) } }

// Comprehensive XEP-17 token management public class XEP17Manager { private let epicchainSwift: EpicChainSwift private let tokenCache: TokenCache init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.tokenCache = TokenCache() } // Get token information func getTokenInfo(_ tokenHash: Hash160) async throws -> XEP17TokenInfo { if let cached = tokenCache.getTokenInfo(tokenHash) { return cached } let token = EpicChainToken(epicchainSwift) async let symbol = token.symbol(tokenHash) async let decimals = token.decimals(tokenHash) async let totalSupply = token.totalSupply(tokenHash) let info = try await XEP17TokenInfo( hash: tokenHash, symbol: symbol, decimals: decimals, totalSupply: totalSupply ) tokenCache.storeTokenInfo(info) return info } // Transfer tokens with advanced options func transferTokens( from: Account, to: Hash160, token: Hash160, amount: Int, options: TransferOptions = .default ) async throws -> TransactionResult { let tokenInfo = try await getTokenInfo(token) // Validate amount precision try validateAmount(amount, decimals: tokenInfo.decimals) // Build transfer transaction let transaction = try await EpicChainToken(epicchainSwift) .transfer(from, to, amount, token) .signers(AccountSigner.calledByEntry(from)) .systemFee(options.systemFee) .networkFee(options.networkFee) .sign() return try await transaction.send() } // Batch token transfers func batchTransfer( from: Account, transfers: [TokenTransfer], options: BatchTransferOptions = .default ) async throws -> [TransactionResult] { var results: [TransactionResult] = [] for transfer in transfers { let result = try await transferTokens( from: from, to: transfer.recipient, token: transfer.token, amount: transfer.amount, options: options.transferOptions ) results.append(result) // Respect batch delay if specified if let delay = options.delayBetweenTransfers { try await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000)) } } return results } } // XEP-17 data structures public struct XEP17TokenInfo { let hash: Hash160 let symbol: String let decimals: Int let totalSupply: Int let name: String? let iconURL: URL? // Format amount with proper decimals func formatAmount(_ amount: Int) -> String { let divisor = pow(10.0, Double(decimals)) let formatted = Double(amount) / divisor return String(format: "%.\(decimals)f", formatted) } } public struct TokenTransfer { let token: Hash160 let recipient: Hash160 let amount: Int let memo: String? } public struct BatchTransferOptions { let transferOptions: TransferOptions let delayBetweenTransfers: TimeInterval? let stopOnFailure: Bool static let `default` = BatchTransferOptions( transferOptions: .default, delayBetweenTransfers: nil, stopOnFailure: true ) }

// Comprehensive XEP-11 NFT management public class XEP11Manager { private let epicchainSwift: EpicChainSwift private let metadataCache: NFTMetadataCache init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.metadataCache = NFTMetadataCache() } // Get NFT collection information func getCollectionInfo(_ collectionHash: Hash160) async throws -> NFTCollectionInfo { let nft = NonFungibleToken(scriptHash: collectionHash, epicchainSwift: epicchainSwift) async let symbol = nft.symbol() async let decimals = nft.decimals() async let totalSupply = nft.totalSupply() return try await NFTCollectionInfo( hash: collectionHash, symbol: symbol, decimals: decimals, totalSupply: totalSupply ) } // Get NFT token metadata func getTokenMetadata( _ collectionHash: Hash160, tokenId: Int ) async throws -> NFTTokenMetadata { let cacheKey = "\(collectionHash)-\(tokenId)" if let cached = metadataCache.getMetadata(for: cacheKey) { return cached } let nft = NonFungibleToken(scriptHash: collectionHash, epicchainSwift: epicchainSwift) let properties = try await nft.properties([tokenId]) let metadata = NFTTokenMetadata( tokenId: tokenId, collection: collectionHash, properties: properties, name: properties["name"] as? String, description: properties["description"] as? String, image: properties["image"] as? String, attributes: parseAttributes(from: properties) ) metadataCache.storeMetadata(metadata, for: cacheKey) return metadata } // Transfer NFT with verification func transferNFT( from: Account, to: Hash160, collection: Hash160, tokenId: Int, options: NFTTransferOptions = .default ) async throws -> TransactionResult { // Verify ownership before transfer let owner = try await getNFTOwner(collection, tokenId: tokenId) guard owner == from.getScriptHash() else { throw NFTError.notOwner } let nft = NonFungibleToken(scriptHash: collection, epicchainSwift: epicchainSwift) let transaction = try await nft .transfer(from, to, 1, [tokenId]) // amount is 1 for NFTs .signers(AccountSigner.calledByEntry(from)) .systemFee(options.systemFee) .networkFee(options.networkFee) .sign() return try await transaction.send() } // Batch NFT operations func batchNFTTransfer( from: Account, transfers: [NFTTransfer], options: BatchNFTTransferOptions = .default ) async throws -> [TransactionResult] { // Group transfers by collection for efficiency let transfersByCollection = Dictionary(grouping: transfers) { $0.collection } var results: [TransactionResult] = [] for (collection, collectionTransfers) in transfersByCollection { let tokenIds = collectionTransfers.map { $0.tokenId } let nft = NonFungibleToken(scriptHash: collection, epicchainSwift: epicchainSwift) // Single transaction for all transfers in this collection let transaction = try await nft .transfer(from, transfers.first!.recipient, 1, tokenIds) .signers(AccountSigner.calledByEntry(from)) .systemFee(options.systemFee) .networkFee(options.networkFee) .sign() let result = try await transaction.send() results.append(result) } return results } } // XEP-11 data structures public struct NFTCollectionInfo { let hash: Hash160 let symbol: String let decimals: Int let totalSupply: Int let name: String? let description: String? let externalURL: URL? } public struct NFTTokenMetadata { let tokenId: Int let collection: Hash160 let properties: [String: Any] let name: String? let description: String? let image: String? let attributes: [NFTAttribute] } public struct NFTAttribute { let traitType: String let value: Any let displayType: DisplayType? } public enum DisplayType { case string case number case date case boostPercentage case boostNumber }

// Enterprise-grade key management public class SecureKeyManager { private let security: SecurityManager private let keychain: KeychainManager private let secureEnclave: SecureEnclaveManager? init(securityLevel: SecurityLevel = .high) { self.security = SecurityManager.shared self.keychain = KeychainManager(service: "com.yourapp.epicchain") if SecureEnclaveManager.isAvailable { self.secureEnclave = SecureEnclaveManager() } else { self.secureEnclave = nil } configureSecurity(securityLevel) } // Generate secure key pair based on security level func generateKeyPair(securityLevel: SecurityLevel) throws -> SecureECKeyPair { switch securityLevel { case .standard: return try SecureECKeyPair.createEcKeyPair() case .high: guard let secureEnclave = secureEnclave else { throw SecurityError.secureEnclaveUnavailable } return try secureEnclave.generateKeyPair() case .maximum: // Use hardware security module or specialized hardware return try generateHSMKeyPair() } } // Store encrypted private key func storePrivateKey( _ privateKey: Data, for account: Hash160, encryptionKey: Data, biometricProtection: Bool = false ) throws { // Encrypt the private key let encryptedKey = try security.encryptPrivateKey(privateKey, with: encryptionKey) // Store in appropriate location based on security level if biometricProtection { try keychain.storeWithBiometry( encryptedKey, for: account.string, context: "EpicChain Transaction Signing" ) } else { try keychain.store(encryptedKey, for: account.string) } // Clear sensitive data from memory security.zeroData(&privateKey) security.zeroData(&encryptedKey) } // Retrieve and decrypt private key func retrievePrivateKey( for account: Hash160, decryptionKey: Data, biometricContext: LAContext? = nil ) throws -> Data { // Retrieve encrypted key let encryptedKey: Data if let context = biometricContext { encryptedKey = try keychain.retrieveWithBiometry( for: account.string, context: context ) } else { encryptedKey = try keychain.retrieve(for: account.string) } // Decrypt the key let privateKey = try security.decryptPrivateKey(encryptedKey, with: decryptionKey) return privateKey } } // Biometric authentication integration public class BiometricAuthManager { private let context = LAContext() private let keychain: KeychainManager init() { self.keychain = KeychainManager(service: "com.yourapp.epicchain") } // Check biometric availability var isBiometricAvailable: Bool { var error: NSError? return context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) } // Authenticate with biometrics func authenticateWithBiometrics(reason: String = "Access your EpicChain wallet") async throws -> Bool { return try await withCheckedThrowingContinuation { continuation in context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason) { success, error in if let error = error { continuation.resume(throwing: error) } else { continuation.resume(returning: success) } } } } // Store sensitive data with biometric protection func storeWithBiometricProtection(_ data: Data, for key: String) throws { try keychain.storeWithBiometry( data, for: key, context: context, accessControl: .userPresence ) } }

// Transaction security and verification public class TransactionSecurityManager { private let epicchainSwift: EpicChainSwift private let security: SecurityManager private let threatDetection: ThreatDetectionEngine init(epicchainSwift: EpicChainSwift) { self.epicchainSwift = epicchainSwift self.security = SecurityManager.shared self.threatDetection = ThreatDetectionEngine() } // Comprehensive transaction verification func verifyTransaction( _ transaction: Transaction, for account: Account, context: VerificationContext ) async throws -> VerificationResult { var warnings: [SecurityWarning] = [] var errors: [SecurityError] = [] // 1. Basic structure verification try verifyTransactionStructure(transaction) // 2. Script analysis try await verifyScript(transaction.script, context: context) // 3. Signer verification try verifySigners(transaction.signers, account: account) // 4. Fee verification try verifyFees(transaction.systemFee, transaction.networkFee, context: context) // 5. Threat detection let threats = try await threatDetection.analyzeTransaction(transaction) warnings.append(contentsOf: threats.warnings) errors.append(contentsOf: threats.errors) // 6. Contract interaction analysis if let contractHash = extractContractHash(transaction.script) { try await verifyContractInteraction(contractHash, context: context) } return VerificationResult( isValid: errors.isEmpty, warnings: warnings, errors: errors, riskLevel: calculateRiskLevel(warnings: warnings, errors: errors) ) } // Real-time threat monitoring func monitorForThreats(account: Account) -> AnyPublisher<ThreatAlert, Never> { return threatDetection.monitorAccount(account.getScriptHash()) } } // Security verification structures public struct VerificationContext { let purpose: TransactionPurpose let allowedContracts: [Hash160] let maxValue: Int let requireConfirmation: Bool let securityLevel: SecurityLevel static let standard = VerificationContext( purpose: .general, allowedContracts: [], maxValue: Int.max, requireConfirmation: false, securityLevel: .standard ) static let highValue = VerificationContext( purpose: .assetTransfer, allowedContracts: [], maxValue: 1000000000, // 10 EpicChain requireConfirmation: true, securityLevel: .high ) } public struct VerificationResult { let isValid: Bool let warnings: [SecurityWarning] let errors: [SecurityError] let riskLevel: RiskLevel let recommendation: String? } public enum RiskLevel { case low case medium case high case critical }

// Performance optimization manager public class PerformanceManager { private let cache: MultiLevelCache private let optimizer: TransactionOptimizer private let monitor: PerformanceMonitor init() { self.cache = MultiLevelCache() self.optimizer = TransactionOptimizer() self.monitor = PerformanceMonitor() setupOptimizations() } private func setupOptimizations() { // Configure hash caching HashCache.shared.maxCacheSize = 10000 HashCache.shared.compressionEnabled = true // Configure serialization optimizations BinarySerialization.enableOptimizations() // Setup background compression setupBackgroundCompression() } // Batch transaction optimization func optimizeTransactionBatch(_ transactions: [Transaction]) -> [Transaction] { return optimizer.optimizeBatch(transactions) } // Cache management func preloadFrequentData(accounts: [Hash160]) async { await withTaskGroup(of: Void.self) { group in for account in accounts { group.addTask { // Preload account balances _ = try? await self.cache.getAccountBalances(account) // Preload frequent contracts _ = try? await self.cache.getContractManifest(EpicChainToken.SCRIPT_HASH) } } } } } // Multi-level caching system public class MultiLevelCache { private let memoryCache: NSCache<NSString, AnyObject> private let diskCache: DiskCache private let networkCache: NetworkCache init() { self.memoryCache = NSCache() self.diskCache = DiskCache() self.networkCache = NetworkCache() configureMemoryCache() } private func configureMemoryCache() { memoryCache.countLimit = 1000 memoryCache.totalCostLimit = 50 * 1024 * 1024 // 50MB } // Get data with multi-level cache fallthrough func get<T: Codable>(_ key: String, type: T.Type) async throws -> T { // Check memory cache first if let cached = memoryCache.object(forKey: key as NSString) as? T { monitor.hit(.memory) return cached } // Check disk cache if let diskCached = try? diskCache.get(key, type: type) { // Store in memory cache for future access memoryCache.setObject(diskCached as AnyObject, forKey: key as NSString) monitor.hit(.disk) return diskCached } // Fetch from network let networkData = try await networkCache.get(key, type: type) // Store in both caches memoryCache.setObject(networkData as AnyObject, forKey: key as NSString) try diskCache.set(networkData, for: key) monitor.hit(.network) return networkData } }

// Secure memory management public class SecureMemoryManager { private var protectedRegions: [ProtectedMemoryRegion] = [] private let zeroingQueue = DispatchQueue(label: "com.epicchain.secure-memory-zeroing") // Allocate protected memory region func allocateProtectedRegion(size: Int, autoZeroing: Bool = true) -> ProtectedMemoryRegion { let region = ProtectedMemoryRegion(size: size) if autoZeroing { setupAutoZeroing(for: region) } protectedRegions.append(region) return region } // Zero sensitive data on background thread private func setupAutoZeroing(for region: ProtectedMemoryRegion) { zeroingQueue.asyncAfter(deadline: .now() + 30.0) { [weak self] in region.zero() self?.protectedRegions.removeAll { $0.id == region.id } } } // Emergency zero all protected regions func emergencyZeroAll() { zeroingQueue.sync { for region in protectedRegions { region.zero() } protectedRegions.removeAll() } } } // Protected memory region implementation public class ProtectedMemoryRegion { let id = UUID() private let size: Int private let pointer: UnsafeMutableRawPointer private let protection: MemoryProtection init(size: Int, protection: MemoryProtection = .readWrite) { self.size = size self.protection = protection self.pointer = UnsafeMutableRawPointer.allocate(byteCount: size, alignment: 1) // Set memory protection setMemoryProtection() } // Zero the memory region func zero() { pointer.initializeMemory(as: UInt8.self, repeating: 0, count: size) } deinit { zero() pointer.deallocate() } }

import XCTest import EpicChainSwift import Combine // Main test suite class EpicChainSwiftTests: XCTestCase { var epicchainSwift: EpicChainSwift! var testAccount: Account! var cancellables: Set<AnyCancellable> = [] override func setUp() async throws { // Use testnet for testing let testNetURL = URL(string: "https://testnet1-seed.epic-chain.org:10111")! epicchainSwift = EpicChainSwift.build(HttpService(url: testNetURL)) // Create test account with test funds testAccount = try Account.createNewAccount() // Fund the test account (in real scenario, use testnet faucet) try await fundTestAccount() } override func tearDown() { cancellables.removeAll() } // Test account creation and management func testAccountCreation() throws { // Test secure account creation let secureAccount = try Account.createNewAccount() .securedWith(securityLevel: .high) XCTAssertFalse(secureAccount.getAddress().isEmpty) XCTAssertTrue(secureAccount.verify()) } // Test transaction building and signing func testTransactionBuilding() async throws { let script = try ScriptBuilder() .contractCall(EpicChainToken.SCRIPT_HASH, method: "symbol", params: []) .toArray() let transaction = try await TransactionBuilder(epicchainSwift) .script(script) .signers(AccountSigner.calledByEntry(testAccount)) .sign() XCTAssertFalse(transaction.hash.string.isEmpty) XCTAssertTrue(transaction.verify()) } // Test contract interactions func testContractInteraction() async throws { let contractHash = try Hash160("0x1a70eac53f5882e40dd90f55463cce31a9f72cd4") let contract = SmartContract(scriptHash: contractHash, epicchainSwift: epicchainSwift) let result = try await contract.callInvokeFunction( "resolve", [ContractParameter.string("test.epicchain")], [] ) XCTAssertEqual(result.state, .halt) } // Test performance with large datasets func testPerformanceLargeBatch() { measure { let expectation = self.expectation(description: "Batch completion") Task { // Perform batch operations let transactions = try await createBatchTransactions(count: 100) let results = try await sendBatchTransactions(transactions) XCTAssertEqual(results.count, 100) expectation.fulfill() } waitForExpectations(timeout: 30.0) } } } // Security-specific tests class SecurityTests: XCTestCase { func testSecureMemoryManagement() { let secureManager = SecureMemoryManager() let region = secureManager.allocateProtectedRegion(size: 256) // Write sensitive data region.withUnsafeBytes { pointer in // Simulate writing private key pointer.initializeMemory(as: UInt8.self, repeating: 0xAA, count: 256) } // Zero the region region.zero() // Verify data is zeroed region.withUnsafeBytes { pointer in for byte in pointer { XCTAssertEqual(byte, 0) } } } func testTimingAttackResistance() { let attackerControlled = "attacker_input" let secretValue = "secret_value" // Measure time for comparison let startTime = Date() for _ in 0..<1000 { _ = SecurityUtilities.constantTimeCompare(attackerControlled, secretValue) } let duration = Date().timeIntervalSince(startTime) // Timing should be consistent regardless of input XCTAssertLessThan(duration, 1.0) // Should complete quickly } } // Integration tests class IntegrationTests: XCTestCase { var integrationManager: IntegrationTestManager! override func setUp() { integrationManager = IntegrationTestManager() } func testEndToEndTransactionFlow() async throws { // Test complete transaction flow let result = try await integrationManager.testCompleteFlow() XCTAssertTrue(result.success) XCTAssertNotNil(result.transactionHash) XCTAssertNotNil(result.blockConfirmation) } func testErrorConditions() async throws { // Test various error conditions let invalidHash = try Hash256("0xinvalid") do { _ = try await integrationManager.getTransaction(invalidHash) XCTFail("Should have thrown error") } catch { XCTAssertTrue(error is EpicChainError) } } }

// Test utilities and helpers public class TestUtilities { // Create mock blockchain state for testing static func createMockBlockchainState(height: Int = 1000) -> BlockchainState { return BlockchainState( height: height, timestamp: Date(), validators: createMockValidators(), network: .testNet ) } // Create test transactions static func createTestTransaction( script: Bytes = [], signers: [Signer] = [], systemFee: Int = 1000000, networkFee: Int = 0 ) -> Transaction { return Transaction( version: 0, nonce: UInt32.random(in: 0...UInt32.max), systemFee: systemFee, networkFee: networkFee, validUntilBlock: 1000, signers: signers, script: script, witnesses: [] ) } // Mock network service for testing static func createMockNetworkService() -> HttpService { let configuration = URLSessionConfiguration.ephemeral configuration.protocolClasses = [MockURLProtocol.self] return HttpService( url: URL(string: "https://mock.epic-chain.org")!, configuration: configuration ) } } // Mock URL protocol for testing class MockURLProtocol: URLProtocol { static var mockResponses: [URL: Result<Data, Error>] = [:] override class func canInit(with request: URLRequest) -> Bool { return true } override class func canonicalRequest(for request: URLRequest) -> URLRequest { return request } override func startLoading() { if let url = request.url, let result = Self.mockResponses[url] { switch result { case .success(let data): client?.urlProtocol(self, didLoad: data) client?.urlProtocolDidFinishLoading(self) case .failure(let error): client?.urlProtocol(self, didFailWithError: error) } } else { client?.urlProtocol(self, didFailWithError: URLError(.badServerResponse)) } } override func stopLoading() { // Required override } }

// Production deployment manager public class ProductionDeploymentManager { private let security: SecurityManager private let config: ProductionConfig init(config: ProductionConfig) { self.security = SecurityManager.shared self.config = config } // Prepare for production deployment func prepareForProduction() throws { // 1. Validate security configuration try validateSecurityConfiguration() // 2. Enable production security features try enableProductionSecurity() // 3. Configure performance optimizations configureProductionPerformance() // 4. Set up monitoring and logging setupProductionMonitoring() // 5. Verify network configuration try verifyNetworkConfiguration() } // Validate production readiness func validateProductionReadiness() -> ProductionReadinessReport { var report = ProductionReadinessReport() // Check security features if !security.isProductionReady { report.addIssue(.critical("Security not production ready")) } // Check performance if !PerformanceManager.shared.isOptimizedForProduction { report.addIssue(.warning("Performance not fully optimized")) } // Check network connectivity if !NetworkManager.shared.hasRedundantConnections { report.addIssue(.warning("No redundant node connections")) } return report } } // Production configuration public struct ProductionConfig { let securityLevel: SecurityLevel let performanceLevel: PerformanceLevel let monitoringEnabled: Bool let backupEnabled: Bool let disasterRecovery: DisasterRecoveryPlan static let standard = ProductionConfig( securityLevel: .high, performanceLevel: .optimized, monitoringEnabled: true, backupEnabled: true, disasterRecovery: .standard ) } // Production readiness report public struct ProductionReadinessReport { var issues: [ProductionIssue] = [] var warnings: [ProductionWarning] = [] var recommendations: [String] = [] var isReady: Bool { return issues.isEmpty } mutating func addIssue(_ issue: ProductionIssue) { issues.append(issue) } }