Advanced Wallet Features

# Create a 2-of-3 multisig wallet
tos-wallet create-multisig \
  --name "Company Treasury" \
  --required-signatures 2 \
  --total-signers 3 \
  --signers "CEO:tos1ceo_public_key,CFO:tos1cfo_public_key,CTO:tos1cto_public_key" \
  --timeout-hours 24
 
# Output:
# Multisig Address: tos1multisig_company_treasury_address
# Script Hash: 0x1a2b3c4d5e6f...
# Backup Data: Export and securely store this data

// JavaScript SDK example
import { TOSWallet, MultisigConfig } from '@tos-network/wallet';
 
const multisigConfig = new MultisigConfig({
  name: "Corporate Treasury",
  requiredSignatures: 3,
  totalSigners: 5,
  signers: [
    { label: "CEO", publicKey: "0xceo_public_key", weight: 2 },
    { label: "CFO", publicKey: "0xcfo_public_key", weight: 2 },
    { label: "CTO", publicKey: "0xcto_public_key", weight: 1 },
    { label: "COO", publicKey: "0xcoo_public_key", weight: 1 },
    { label: "Board Rep", publicKey: "0xboard_public_key", weight: 1 }
  ],
  weightedThreshold: 4, // Require total weight of 4
  timelock: {
    enabled: true,
    delayHours: 48,
    emergencyOverride: ["CEO", "CFO"] // 2 specific signers can override
  },
  spendingLimits: {
    dailyLimit: "1000000000000000", // 1M TOS
    transactionLimit: "100000000000000", // 100K TOS per transaction
    emergencyLimit: "10000000000000000" // 10M TOS with all signatures
  }
});
 
const multisigWallet = await TOSWallet.createMultisig(multisigConfig);

# Propose a transaction
tos-wallet multisig-propose \
  --wallet-id "multisig_company_treasury" \
  --to "tos1vendor_payment_address" \
  --amount "50000000000000" \
  --description "Q1 Development Services Payment" \
  --reference "PO-2024-001" \
  --expiry-hours 48
 
# Output:
# Proposal ID: proposal_550e8400-e29b-41d4-a716-446655440001
# Required Signatures: 3
# Current Signatures: 1 (Your signature automatically added)
# Expiry: 2024-01-17 14:30:00 UTC

// Review pending proposals
const pendingProposals = await wallet.multisig.getPendingProposals();
 
for (const proposal of pendingProposals) {
  console.log(`Proposal: ${proposal.description}`);
  console.log(`Amount: ${proposal.amount} TOS`);
  console.log(`Signatures: ${proposal.currentSignatures}/${proposal.requiredSignatures}`);
  console.log(`Expires: ${proposal.expiryTime}`);
 
  // Detailed review
  const details = await wallet.multisig.getProposalDetails(proposal.id);
  console.log(`Risk Assessment: ${details.riskLevel}`);
  console.log(`Compliance Check: ${details.complianceStatus}`);
 
  // Sign if approved
  if (details.complianceStatus === 'approved') {
    await wallet.multisig.signProposal(proposal.id, {
      password: "your_password",
      comment: "Approved after compliance review"
    });
  }
}

# Monitor proposal status
tos-wallet multisig-status --proposal-id "proposal_550e8400-e29b-41d4-a716-446655440001"
 
# Output:
# Proposal Status: Ready for Execution
# Signatures Collected: 3/3
# Signers: CEO, CFO, CTO
# Auto-execution: Enabled
# Execution Block: 1250123 (Next block)
 
# Manual execution (if auto-execution disabled)
tos-wallet multisig-execute --proposal-id "proposal_550e8400-e29b-41d4-a716-446655440001"

# Corporate structure configuration
hierarchy:
  departments:
    - name: "Finance"
      budget_limit: "1000000000000000" # 1M TOS
      required_signatures: 2
      signers: ["CFO", "Finance_Manager", "Accountant"]
 
    - name: "Development"
      budget_limit: "500000000000000" # 500K TOS
      required_signatures: 2
      signers: ["CTO", "Dev_Lead", "Product_Manager"]
 
    - name: "Operations"
      budget_limit: "250000000000000" # 250K TOS
      required_signatures: 1
      signers: ["COO", "Ops_Manager"]
 
  escalation_rules:
    - condition: "amount > department_limit"
      action: "require_executive_approval"
      executives: ["CEO", "CFO"]
 
    - condition: "external_transfer && amount > 100000000000000"
      action: "require_board_approval"
      board_members: ["Board_Rep_1", "Board_Rep_2"]

class ComplianceEngine:
    def __init__(self, wallet):
        self.wallet = wallet
        self.rules = self.load_compliance_rules()
 
    async def review_transaction(self, proposal):
        """Automated compliance review"""
 
        checks = []
 
        # AML/KYC Check
        aml_result = await self.check_aml(proposal.destination)
        checks.append({
            'type': 'AML',
            'status': 'pass' if aml_result.clean else 'fail',
            'details': aml_result.details
        })
 
        # Sanctions Screening
        sanctions_result = await self.check_sanctions(proposal.destination)
        checks.append({
            'type': 'Sanctions',
            'status': 'pass' if not sanctions_result.flagged else 'fail',
            'details': sanctions_result.details
        })
 
        # Budget Compliance
        budget_check = await self.check_budget_limits(proposal)
        checks.append({
            'type': 'Budget',
            'status': 'pass' if budget_check.within_limits else 'warning',
            'details': f"${budget_check.remaining_budget} remaining"
        })
 
        # Risk Assessment
        risk_score = await self.calculate_risk_score(proposal)
        checks.append({
            'type': 'Risk',
            'status': 'pass' if risk_score < 0.7 else 'review_required',
            'score': risk_score
        })
 
        return {
            'overall_status': self.determine_overall_status(checks),
            'checks': checks,
            'recommendations': self.generate_recommendations(checks)
        }

# Generate stealth address
tos-wallet create-stealth-address \
  --label "Anonymous Donations" \
  --payment-id "charity_2024" \
  --save-keys
 
# Output:
# Stealth Address: tos2stealth_long_address_with_embedded_keys_and_payment_id
# Public Spend Key: 0x03a1b2c3d4e5f6...
# Public View Key: 0x02b3c4d5e6f7...
# Private Spend Key: [ENCRYPTED]
# Private View Key: [ENCRYPTED]
# QR Code: [Generated for easy sharing]

import { StealthAddress, PaymentID } from '@tos-network/wallet';
 
// Create stealth address with custom parameters
const stealthConfig = {
  label: "Business Payments",
  paymentId: PaymentID.generate("business_invoices"),
  viewOnly: false, // Set to true for view-only addresses
  subaddresses: {
    enabled: true,
    count: 10, // Pre-generate 10 subaddresses
    labels: ["Invoice", "Subscription", "Refund", "Bonus", "Misc"]
  },
  scanning: {
    enabled: true,
    startHeight: 1250000, // Start scanning from this block
    batchSize: 1000, // Blocks to scan per batch
    frequency: 30 // Scan every 30 seconds
  }
};
 
const stealthAddress = await wallet.createStealthAddress(stealthConfig);
 
// Share stealth address
const shareableAddress = stealthAddress.getShareableFormat({
  includePaymentId: true,
  includeLabel: false,
  generateQR: true
});
 
console.log(`Share this address: ${shareableAddress.address}`);
console.log(`QR Code: ${shareableAddress.qrCode}`);

import asyncio
from tos_wallet import StealthScanner
 
class StealthTransactionScanner:
    def __init__(self, wallet, stealth_addresses):
        self.wallet = wallet
        self.stealth_addresses = stealth_addresses
        self.scanner = StealthScanner(wallet.daemon)
 
    async def scan_for_transactions(self, start_height=None, end_height=None):
        """Scan blockchain for stealth transactions"""
 
        results = []
 
        for stealth_addr in self.stealth_addresses:
            print(f"Scanning for {stealth_addr.label}...")
 
            # Scan blockchain
            transactions = await self.scanner.scan_range(
                stealth_address=stealth_addr.address,
                view_key=stealth_addr.private_view_key,
                start_height=start_height or stealth_addr.creation_height,
                end_height=end_height
            )
 
            for tx in transactions:
                # Verify transaction belongs to us
                if self.verify_ownership(tx, stealth_addr):
                    results.append({
                        'stealth_address': stealth_addr.label,
                        'transaction_hash': tx.hash,
                        'amount': tx.amount,
                        'block_height': tx.block_height,
                        'timestamp': tx.timestamp,
                        'one_time_address': tx.one_time_address,
                        'payment_id': tx.payment_id
                    })
 
        return results
 
    def verify_ownership(self, transaction, stealth_addr):
        """Verify transaction belongs to stealth address"""
 
        # Derive one-time private key
        one_time_key = stealth_addr.derive_one_time_key(
            transaction.one_time_public_key
        )
 
        # Check if we can spend this output
        return self.wallet.can_spend_output(
            transaction.output_key,
            one_time_key
        )
 
    async def auto_scan(self, interval=60):
        """Continuously scan for new transactions"""
 
        last_scanned_height = await self.wallet.get_sync_height()
 
        while True:
            try:
                current_height = await self.wallet.daemon.get_height()
 
                if current_height > last_scanned_height:
                    new_transactions = await self.scan_for_transactions(
                        start_height=last_scanned_height + 1,
                        end_height=current_height
                    )
 
                    if new_transactions:
                        await self.process_new_transactions(new_transactions)
 
                    last_scanned_height = current_height
 
                await asyncio.sleep(interval)
 
            except Exception as e:
                print(f"Scanning error: {e}")
                await asyncio.sleep(interval)

<!-- HTML payment form with stealth address -->
<div class="payment-form">
  <h3>Private Payment</h3>
 
  <div class="stealth-address">
    <label>Recipient Stealth Address:</label>
    <input type="text"
           value="tos2stealth_address_here"
           readonly
           class="stealth-input">
    <button onclick="showQRCode()">Show QR</button>
  </div>
 
  <div class="amount-input">
    <label>Amount (TOS):</label>
    <input type="number" id="amount" step="0.000000001">
  </div>
 
  <div class="payment-id">
    <label>Payment ID (Optional):</label>
    <input type="text" id="paymentId" placeholder="Optional reference">
  </div>
 
  <button onclick="sendStealthPayment()">Send Private Payment</button>
</div>
 
<script>
async function sendStealthPayment() {
  const stealthAddress = document.querySelector('.stealth-input').value;
  const amount = document.getElementById('amount').value;
  const paymentId = document.getElementById('paymentId').value;
 
  try {
    // Generate one-time address
    const oneTimeAddress = await wallet.stealth.generateOneTimeAddress({
      stealthAddress: stealthAddress,
      paymentId: paymentId
    });
 
    // Send transaction to one-time address
    const transaction = await wallet.transactions.create({
      to: oneTimeAddress.address,
      amount: amount,
      privacyLevel: 'maximum',
      stealthMetadata: {
        oneTimePublicKey: oneTimeAddress.publicKey,
        paymentId: paymentId
      }
    });
 
    console.log('Stealth payment sent:', transaction.hash);
 
  } catch (error) {
    console.error('Payment failed:', error);
  }
}
</script>

# Install TOS app on Ledger device
ledger-live install-app --name "TOS Network"
 
# Initialize hardware wallet connection
tos-wallet hardware-init \
  --device ledger \
  --app-version latest \
  --derivation-path "m/44'/1729'/0'"
 
# Create wallet with hardware device
tos-wallet create \
  --name "Ledger Wallet" \
  --type hardware \
  --device ledger \
  --device-id "ledger_device_12345"

import { LedgerTOS } from '@tos-network/hardware';
 
class HardwareWalletManager {
  constructor() {
    this.ledger = null;
    this.connected = false;
  }
 
  async connect() {
    try {
      this.ledger = new LedgerTOS();
      await this.ledger.connect();
 
      // Verify app is installed
      const appInfo = await this.ledger.getAppInfo();
      if (appInfo.name !== 'TOS Network') {
        throw new Error('TOS app not installed on device');
      }
 
      this.connected = true;
      return true;
 
    } catch (error) {
      console.error('Hardware wallet connection failed:', error);
      return false;
    }
  }
 
  async getAddress(index = 0) {
    if (!this.connected) await this.connect();
 
    const derivationPath = `m/44'/1729'/0'/0/${index}`;
    const result = await this.ledger.getAddress(derivationPath, true); // Show on device
 
    return {
      address: result.address,
      publicKey: result.publicKey,
      derivationPath: derivationPath
    };
  }
 
  async signTransaction(transaction, derivationPath) {
    if (!this.connected) await this.connect();
 
    // Display transaction details on device
    await this.ledger.reviewTransaction({
      to: transaction.destination,
      amount: transaction.amount,
      fee: transaction.fee,
      memo: transaction.memo
    });
 
    // User confirms on device
    const signature = await this.ledger.signTransaction(
      transaction.unsigned_data,
      derivationPath
    );
 
    return {
      signature: signature,
      signed_transaction: transaction.combine_signature(signature)
    };
  }
 
  async signMessage(message, derivationPath) {
    if (!this.connected) await this.connect();
 
    return await this.ledger.signMessage(message, derivationPath);
  }
}
 
// Usage example
const hardware = new HardwareWalletManager();
 
async function sendHardwareTransaction() {
  // Connect to hardware wallet
  await hardware.connect();
 
  // Get address
  const addressInfo = await hardware.getAddress(0);
  console.log('Hardware address:', addressInfo.address);
 
  // Create transaction
  const transaction = await wallet.transactions.create({
    from: addressInfo.address,
    to: 'tos1recipient_address',
    amount: '1000000000000',
    requireHardwareConfirmation: true
  });
 
  // Sign with hardware device
  const signed = await hardware.signTransaction(
    transaction,
    addressInfo.derivationPath
  );
 
  // Broadcast signed transaction
  const result = await wallet.transactions.broadcast(signed.signed_transaction);
  console.log('Transaction sent:', result.hash);
}

import qrcode
import json
from io import BytesIO
 
class AirGappedWallet:
    def __init__(self, offline_wallet):
        self.offline_wallet = offline_wallet
 
    def create_unsigned_transaction(self, to_address, amount, fee=None):
        """Create unsigned transaction for air-gapped signing"""
 
        transaction = {
            'version': 1,
            'from': self.offline_wallet.address,
            'to': to_address,
            'amount': str(amount),
            'fee': str(fee or self.estimate_fee()),
            'nonce': self.get_next_nonce(),
            'timestamp': int(time.time()),
            'privacy_level': 'maximum'
        }
 
        # Create QR code for transfer to offline device
        qr_data = {
            'type': 'tos_unsigned_transaction',
            'data': transaction
        }
 
        return {
            'transaction': transaction,
            'qr_code': self.generate_qr_code(qr_data),
            'hex_data': json.dumps(qr_data).encode().hex()
        }
 
    def sign_offline_transaction(self, unsigned_transaction, private_key):
        """Sign transaction on air-gapped device"""
 
        # Verify transaction details
        self.verify_transaction_safety(unsigned_transaction)
 
        # Sign transaction
        signature = self.offline_wallet.sign(unsigned_transaction, private_key)
 
        signed_transaction = {
            **unsigned_transaction,
            'signature': signature,
            'public_key': self.offline_wallet.public_key
        }
 
        # Create QR code for transfer back to online device
        qr_data = {
            'type': 'tos_signed_transaction',
            'data': signed_transaction
        }
 
        return {
            'signed_transaction': signed_transaction,
            'qr_code': self.generate_qr_code(qr_data),
            'hex_data': json.dumps(qr_data).encode().hex()
        }
 
    def broadcast_signed_transaction(self, signed_transaction):
        """Broadcast signed transaction from online device"""
 
        # Verify signature
        if not self.verify_signature(signed_transaction):
            raise ValueError("Invalid transaction signature")
 
        # Broadcast to network
        return self.wallet.daemon.submit_transaction(signed_transaction)
 
    def generate_qr_code(self, data):
        """Generate QR code for data transfer"""
 
        qr = qrcode.QRCode(
            version=1,
            error_correction=qrcode.constants.ERROR_CORRECT_L,
            box_size=10,
            border=4,
        )
 
        qr.add_data(json.dumps(data))
        qr.make(fit=True)
 
        img = qr.make_image(fill_color="black", back_color="white")
 
        # Convert to base64 for display
        buffer = BytesIO()
        img.save(buffer, format='PNG')
        buffer.seek(0)
 
        import base64
        return base64.b64encode(buffer.read()).decode()

class RingSignatureWallet {
  constructor(wallet) {
    this.wallet = wallet;
    this.ringSize = 11; // Odd number for better anonymity
  }
 
  async createRingSignature(transaction, ringMembers = null) {
    // Get ring members (other addresses to mix with)
    if (!ringMembers) {
      ringMembers = await this.selectRingMembers(transaction.amount);
    }
 
    // Create ring signature
    const ringSignature = await this.wallet.crypto.createRingSignature({
      transaction: transaction,
      signerIndex: this.findSignerIndex(ringMembers),
      ringMembers: ringMembers,
      privateKey: this.wallet.privateKey
    });
 
    return {
      signature: ringSignature,
      ringMembers: ringMembers,
      anonymitySet: ringMembers.length
    };
  }
 
  async selectRingMembers(amount) {
    // Find addresses with similar transaction patterns
    const candidates = await this.wallet.daemon.findMixinCandidates({
      amount: amount,
      minRingSize: this.ringSize,
      excludeAddress: this.wallet.address
    });
 
    // Select diverse ring members
    return this.diversifyRingSelection(candidates);
  }
 
  diversifyRingSelection(candidates) {
    // Implement diversity algorithm
    // - Different transaction times
    // - Different amounts
    // - Geographic diversity
    return candidates.slice(0, this.ringSize - 1);
  }
}

from tos_crypto import PedersenCommitment, RangeProof
 
class ConfidentialTransaction:
    def __init__(self, wallet):
        self.wallet = wallet
 
    def create_confidential_transfer(self, to_address, amount, fee):
        """Create transaction with hidden amounts"""
 
        # Generate blinding factors
        amount_blinding = self.generate_blinding_factor()
        fee_blinding = self.generate_blinding_factor()
 
        # Create Pedersen commitments
        amount_commitment = PedersenCommitment.commit(amount, amount_blinding)
        fee_commitment = PedersenCommitment.commit(fee, fee_blinding)
 
        # Generate range proofs (prove amounts are positive without revealing them)
        amount_range_proof = RangeProof.generate(
            amount, amount_blinding, 0, 2**64 - 1
        )
        fee_range_proof = RangeProof.generate(
            fee, fee_blinding, 0, 2**32 - 1
        )
 
        # Create transaction with commitments
        transaction = {
            'version': 1,
            'inputs': self.create_confidential_inputs(),
            'outputs': [
                {
                    'address': to_address,
                    'amount_commitment': amount_commitment.to_hex(),
                    'range_proof': amount_range_proof.to_hex()
                }
            ],
            'fee_commitment': fee_commitment.to_hex(),
            'fee_range_proof': fee_range_proof.to_hex(),
            'balance_proof': self.create_balance_proof(
                amount_commitment, fee_commitment
            )
        }
 
        return transaction
 
    def create_balance_proof(self, amount_commitment, fee_commitment):
        """Prove inputs equal outputs + fees without revealing amounts"""
 
        # Sum input commitments
        input_commitments = [inp['commitment'] for inp in self.get_inputs()]
        input_sum = PedersenCommitment.sum(input_commitments)
 
        # Sum output commitments
        output_sum = PedersenCommitment.add(amount_commitment, fee_commitment)
 
        # Create zero-knowledge proof that input_sum = output_sum
        return self.wallet.crypto.create_balance_proof(input_sum, output_sum)

# Enterprise wallet access control configuration
rbac_config:
  roles:
    - name: "Administrator"
      permissions:
        - "create_wallet"
        - "delete_wallet"
        - "manage_users"
        - "view_all_transactions"
        - "export_data"
        - "modify_settings"
 
    - name: "Treasurer"
      permissions:
        - "create_transaction"
        - "sign_transaction"
        - "view_balances"
        - "view_transaction_history"
        - "generate_reports"
      spending_limits:
        daily: "10000000000000000"  # 10M TOS
        transaction: "1000000000000000"  # 1M TOS per transaction
 
    - name: "Accountant"
      permissions:
        - "view_balances"
        - "view_transaction_history"
        - "generate_reports"
        - "export_transaction_data"
      restrictions:
        - "read_only"
        - "no_sensitive_data"
 
    - name: "Auditor"
      permissions:
        - "view_transaction_history"
        - "verify_signatures"
        - "generate_audit_reports"
        - "access_compliance_data"
      restrictions:
        - "read_only"
        - "time_limited_access"
 
  users:
    - username: "alice.ceo"
      roles: ["Administrator", "Treasurer"]
      mfa_required: true
      session_timeout: 3600
 
    - username: "bob.cfo"
      roles: ["Treasurer"]
      mfa_required: true
      approval_required_above: "5000000000000000"  # 5M TOS
 
    - username: "charlie.accountant"
      roles: ["Accountant"]
      mfa_required: false
      ip_restrictions: ["192.168.1.0/24"]

class AuditLogger:
    def __init__(self, wallet):
        self.wallet = wallet
        self.audit_db = AuditDatabase()
 
    def log_action(self, action, user, details, risk_level="medium"):
        """Log all wallet actions for audit trail"""
 
        audit_entry = {
            'timestamp': datetime.utcnow(),
            'action': action,
            'user': user,
            'wallet_id': self.wallet.id,
            'details': details,
            'risk_level': risk_level,
            'ip_address': self.get_client_ip(),
            'user_agent': self.get_user_agent(),
            'session_id': self.get_session_id(),
            'verification_hash': self.calculate_verification_hash(details)
        }
 
        # Store in tamper-evident log
        self.audit_db.store_entry(audit_entry)
 
        # Alert on high-risk actions
        if risk_level == "high":
            self.send_security_alert(audit_entry)
 
    def generate_compliance_report(self, start_date, end_date, regulations):
        """Generate compliance report for specific regulations"""
 
        report = ComplianceReport()
 
        for regulation in regulations:
            if regulation == "AML":
                report.add_section(self.generate_aml_report(start_date, end_date))
            elif regulation == "GDPR":
                report.add_section(self.generate_gdpr_report(start_date, end_date))
            elif regulation == "SOX":
                report.add_section(self.generate_sox_report(start_date, end_date))
 
        return report
 
    def verify_audit_integrity(self):
        """Verify audit log hasn't been tampered with"""
 
        entries = self.audit_db.get_all_entries()
 
        for i, entry in enumerate(entries):
            # Verify hash chain
            if i > 0:
                expected_hash = self.calculate_chain_hash(entries[i-1], entry)
                if entry['chain_hash'] != expected_hash:
                    raise AuditIntegrityError(f"Audit log tampered at entry {i}")
 
            # Verify entry hash
            calculated_hash = self.calculate_verification_hash(entry['details'])
            if entry['verification_hash'] != calculated_hash:
                raise AuditIntegrityError(f"Entry {i} verification failed")
 
        return True

class DistributedBackup {
  constructor(wallet, config) {
    this.wallet = wallet;
    this.config = config;
    this.shares = [];
  }
 
  async createDistributedBackup(threshold = 3, totalShares = 5) {
    // Create Shamir's Secret Sharing backup
    const walletData = await this.wallet.exportSecureData();
 
    // Split into shares
    const shares = await this.splitSecret(walletData, threshold, totalShares);
 
    // Distribute shares to different locations
    const distribution = await this.distributeShares(shares);
 
    return {
      threshold: threshold,
      totalShares: totalShares,
      distribution: distribution,
      recoveryInstructions: this.generateRecoveryInstructions()
    };
  }
 
  async splitSecret(secret, threshold, totalShares) {
    const shares = [];
 
    // Implement Shamir's Secret Sharing
    for (let i = 1; i <= totalShares; i++) {
      const share = await this.generateShare(secret, i, threshold);
      shares.push({
        index: i,
        data: share,
        checksum: this.calculateChecksum(share)
      });
    }
 
    return shares;
  }
 
  async distributeShares(shares) {
    const distribution = [];
 
    for (const share of shares) {
      const locations = await this.selectDistributionLocations(share);
 
      for (const location of locations) {
        await this.storeShare(share, location);
        distribution.push({
          shareIndex: share.index,
          location: location.type,
          identifier: location.id
        });
      }
    }
 
    return distribution;
  }
 
  async recoverFromShares(shareInputs) {
    if (shareInputs.length < this.config.threshold) {
      throw new Error('Insufficient shares for recovery');
    }
 
    // Verify share integrity
    for (const shareInput of shareInputs) {
      if (!this.verifyShareIntegrity(shareInput)) {
        throw new Error(`Invalid share: ${shareInput.index}`);
      }
    }
 
    // Reconstruct secret
    const reconstructedSecret = await this.reconstructSecret(shareInputs);
 
    // Import wallet from reconstructed data
    return await this.wallet.importFromSecureData(reconstructedSecret);
  }
}

class TimeLockRecovery:
    def __init__(self, wallet):
        self.wallet = wallet
 
    def create_time_locked_backup(self, unlock_date, recovery_addresses):
        """Create backup that unlocks after specific date"""
 
        # Create time-locked smart contract
        timelock_contract = {
            'type': 'timelock_recovery',
            'unlock_timestamp': int(unlock_date.timestamp()),
            'recovery_addresses': recovery_addresses,
            'required_signatures': len(recovery_addresses) // 2 + 1,
            'wallet_data_hash': self.hash_wallet_data(),
            'emergency_override': {
                'enabled': True,
                'override_addresses': recovery_addresses[:2],  # First 2 can override
                'override_delay_hours': 168  # 7 days
            }
        }
 
        # Deploy contract
        contract_address = self.deploy_timelock_contract(timelock_contract)
 
        # Encrypt wallet data with contract key
        encrypted_backup = self.encrypt_with_timelock(
            self.wallet.export_data(),
            contract_address
        )
 
        return {
            'contract_address': contract_address,
            'encrypted_backup': encrypted_backup,
            'recovery_instructions': self.generate_recovery_instructions(
                contract_address, unlock_date, recovery_addresses
            )
        }
 
    def initiate_recovery(self, contract_address, recovery_signatures):
        """Initiate recovery process with required signatures"""
 
        # Verify current time vs unlock time
        contract = self.get_timelock_contract(contract_address)
 
        current_time = datetime.utcnow()
        unlock_time = datetime.fromtimestamp(contract['unlock_timestamp'])
 
        if current_time < unlock_time:
            # Check for emergency override
            if not self.check_emergency_override(recovery_signatures, contract):
                raise ValueError("Recovery not available until unlock time")
 
        # Verify signatures
        if not self.verify_recovery_signatures(recovery_signatures, contract):
            raise ValueError("Insufficient or invalid recovery signatures")
 
        # Decrypt wallet data
        decrypted_data = self.decrypt_with_timelock(
            contract['encrypted_backup'],
            contract_address
        )
 
        # Restore wallet
        return self.wallet.import_from_backup(decrypted_data)

// iOS Swift implementation
import TosNetworkSDK
import CryptoKit
 
class MobileWalletManager {
    private let wallet: TosWallet
    private let keychain: Keychain
    private let biometrics: BiometricAuth
 
    init() {
        self.wallet = TosWallet()
        self.keychain = Keychain(service: "com.tosnetwork.wallet")
        self.biometrics = BiometricAuth()
    }
 
    func createSecureWallet(name: String) async throws -> WalletInfo {
        // Generate secure entropy using device hardware
        let entropy = try SecRandomData(count: 32)
 
        // Create wallet with hardware-backed security
        let walletConfig = WalletConfig(
            name: name,
            entropy: entropy,
            securityLevel: .maximum,
            biometricAuth: true,
            cloudBackup: false  // Local only for security
        )
 
        let walletInfo = try await wallet.create(config: walletConfig)
 
        // Store in Secure Enclave
        try keychain.storeWalletKeys(
            walletId: walletInfo.id,
            privateKey: walletInfo.privateKey,
            accessControl: .biometryAny
        )
 
        return walletInfo
    }
 
    func authenticatedTransaction(
        to: String,
        amount: String,
        biometricPrompt: String
    ) async throws -> TransactionResult {
 
        // Require biometric authentication
        let authResult = try await biometrics.authenticate(
            reason: biometricPrompt
        )
 
        guard authResult.success else {
            throw WalletError.authenticationFailed
        }
 
        // Retrieve keys from Secure Enclave
        let privateKey = try keychain.retrievePrivateKey(
            walletId: wallet.id,
            authContext: authResult.context
        )
 
        // Create and sign transaction
        let transaction = try await wallet.createTransaction(
            to: to,
            amount: amount,
            privacyLevel: .maximum
        )
 
        let signedTx = try wallet.sign(
            transaction: transaction,
            privateKey: privateKey
        )
 
        // Clear sensitive data from memory
        privateKey.zeroize()
 
        return try await wallet.broadcast(signedTx)
    }
}

// TypeScript Web Wallet
import { TOSWebWallet, WebAuthn, ServiceWorker } from '@tos-network/web-wallet';
 
class WebWalletManager {
  private wallet: TOSWebWallet;
  private webauthn: WebAuthn;
  private serviceWorker: ServiceWorker;
 
  constructor() {
    this.wallet = new TOSWebWallet();
    this.webauthn = new WebAuthn();
    this.serviceWorker = new ServiceWorker();
  }
 
  async initializeSecureWallet(): Promise<WalletInfo> {
    // Check for hardware security key support
    const hasWebAuthn = await this.webauthn.isSupported();
 
    if (hasWebAuthn) {
      // Create credential with hardware security key
      const credential = await this.webauthn.createCredential({
        challenge: crypto.getRandomValues(new Uint8Array(32)),
        rp: { name: "TOS Network Wallet", id: "wallet.tos.network" },
        user: {
          id: crypto.getRandomValues(new Uint8Array(32)),
          name: "[email protected]",
          displayName: "TOS User"
        },
        authenticatorSelection: {
          authenticatorAttachment: "platform",
          userVerification: "required"
        }
      });
 
      // Store credential ID securely
      await this.storeCredentialId(credential.id);
    }
 
    // Initialize wallet with Web Crypto API
    const cryptoKey = await crypto.subtle.generateKey(
      { name: "ECDSA", namedCurve: "P-256" },
      false, // not extractable
      ["sign", "verify"]
    );
 
    const walletInfo = await this.wallet.create({
      cryptoKey: cryptoKey,
      securityKey: hasWebAuthn ? credential : null,
      storageType: 'indexeddb',
      encryptionKey: await this.deriveEncryptionKey()
    });
 
    // Register service worker for background sync
    await this.serviceWorker.register('/tos-wallet-sw.js');
 
    return walletInfo;
  }
 
  async authenticatedSend(
    destination: string,
    amount: string
  ): Promise<TransactionResult> {
 
    // Authenticate with WebAuthn if available
    if (await this.webauthn.isSupported()) {
      const assertion = await this.webauthn.getAssertion({
        challenge: crypto.getRandomValues(new Uint8Array(32)),
        allowCredentials: [{
          id: await this.getStoredCredentialId(),
          type: "public-key"
        }]
      });
 
      if (!assertion) {
        throw new Error('Authentication failed');
      }
    }
 
    // Create transaction
    const transaction = await this.wallet.createTransaction({
      to: destination,
      amount: amount,
      privacyLevel: 'maximum',
      energyPayment: true
    });
 
    // Sign with Web Crypto API (keys never leave browser)
    const signature = await crypto.subtle.sign(
      { name: "ECDSA", hash: "SHA-256" },
      await this.wallet.getPrivateKey(),
      transaction.hash
    );
 
    transaction.signature = signature;
 
    // Broadcast via service worker for reliability
    return await this.serviceWorker.broadcastTransaction(transaction);
  }
 
  private async deriveEncryptionKey(): Promise<CryptoKey> {
    // Derive encryption key from user password + device fingerprint
    const password = await this.promptForPassword();
    const deviceFingerprint = await this.getDeviceFingerprint();
 
    const keyMaterial = await crypto.subtle.importKey(
      "raw",
      new TextEncoder().encode(password + deviceFingerprint),
      { name: "PBKDF2" },
      false,
      ["deriveKey"]
    );
 
    return await crypto.subtle.deriveKey(
      {
        name: "PBKDF2",
        salt: crypto.getRandomValues(new Uint8Array(16)),
        iterations: 100000,
        hash: "SHA-256"
      },
      keyMaterial,
      { name: "AES-GCM", length: 256 },
      false,
      ["encrypt", "decrypt"]
    );
  }
}