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Deposit & Withdrawal Architecture

use.com's deposit and withdrawal system balances security, speed, and user experience through intelligent routing, risk-based processing, and multi-chain support.


Deposit Flow

1. Address Generation


Unique Addresses: Each user receives unique deposit addresses per asset/chain to enable automatic credit attribution.


Address Derivation: Addressi=Derive(Master_Key,User_ID,Asset,Chain,Index)Address_i = Derive(Master_Key, User_ID, Asset, Chain, Index)Addressi​=Derive(Master_Key,User_ID,Asset,Chain,Index)


Security: Addresses derived from master key using BIP-32/BIP-44 standards, enabling recovery from seed phrase.


2. Blockchain Monitoring


Confirmation Requirements:


Chain


Confirmations


Typical Time


Instant Credit Eligible


Bitcoin


3


~30 min


Tier 3+ users


Ethereum


12


~3 min


Tier 2+ users


BNB Chain


15


~45 sec


Tier 2+ users


Polygon


128


~5 min


Tier 2+ users


Solana


32


~15 sec


All users


Monitoring Frequency: Blocks checked every 10 seconds for new deposits.


3. Credit Processing


Standard Flow:


  1. Detect deposit transaction
  2. Wait for required confirmations
  3. Credit user account
  4. Send notification
  5. Update balance in real-time


Instant Credit (for trusted users):


  • Credit immediately upon detection
  • Set pending flag
  • Reverse if transaction fails (rare)
  • Risk-based limits: $10k-$100k depending on tier


Risk Formula: Instant_Credit_Limit=Base_Limit×Tier_Multiplier×History_FactorInstant_Credit_Limit = Base_Limit \times Tier_Multiplier \times History_FactorInstant_Credit_Limit=Base_Limit×Tier_Multiplier×History_Factor


Withdrawal Flow

1. Request Validation


Checks Performed:


  • Sufficient balance (including reserved amounts)
  • Address format validation
  • Sanctions screening
  • Withdrawal limits (daily/monthly)
  • 2FA verification


Address Validation:


  • Checksum verification (prevents typos)
  • Blacklist check (known scam addresses)
  • Whitelist verification (if enabled)


2. Risk Scoring


Risk_Score=w1×Device+w2×Geo+w3×Velocity+w4×BehavioralRisk_Score = w_1 \times Device + w_2 \times Geo + w_3 \times Velocity + w_4 \times BehavioralRisk_Score=w1​×Device+w2​×Geo+w3​×Velocity+w4​×Behavioral


Processing Tiers:


  • Low Risk (< 0.3): Automatic, hot wallet, < 15 min
  • Medium Risk (0.3-0.7): Enhanced verification, warm wallet, < 1 hour
  • High Risk (≥ 0.7): Manual review, cold storage, < 24 hours


3. Batching Strategy


Small Withdrawals (< $10k):


  • Batched every 15 minutes
  • Processed from hot wallet
  • Network fee optimization


Medium Withdrawals ($10k-$100k):


  • Batched hourly
  • Processed from warm wallet
  • Enhanced monitoring


Large Withdrawals (> $100k):


  • Manual review required
  • Processed from cold storage
  • Dual-control approval
  • Batched daily


Batching Benefits: Cost_Savings=(Individual_Fees×N)−Batch_FeeCost_Savings = (Individual_Fees \times N) - Batch_FeeCost_Savings=(Individual_Fees×N)−Batch_Fee


Example: 100 BTC withdrawals individually = 100 × 0.0001 BTC = 0.01 BTC in fees. Batched = 0.0005 BTC. Savings: 95%.


Multi-Chain Support

Chain Selection


User Options:


  1. Specify Chain: User selects preferred chain
  2. Auto-Select: System chooses lowest-cost chain
  3. Fastest: System chooses fastest confirmation chain


Cost Comparison (Example for USDT withdrawal):


Chain


Network Fee


Confirmation Time


User Cost


Ethereum


$15


~3 min


$15.50


BNB Chain


$0.50


~45 sec


$1.00


Polygon


$0.01


~5 min


$0.51


Arbitrum


$0.10


~1 min


$0.60


Recommendation Engine: Suggests optimal chain based on amount, urgency, and cost.


Cross-Chain Bridging


Internal Bridging: When user deposits on Chain A but wants to withdraw on Chain B:


  1. Accept deposit on Chain A
  2. Credit internal balance
  3. Process withdrawal from Chain B reserves
  4. Rebalance chains periodically


Rebalancing: Rebalance_Amount=Target_Balance−Current_BalanceRebalance_Amount = Target_Balance - Current_BalanceRebalance_Amount=Target_Balance−Current_Balance


Executed when chain balance deviates > 20% from target allocation.


Fee Structure

Deposit Fees


Standard: Free (use.com absorbs blockchain fees)


Exceptions:


  • Small deposits (< $10): May have minimum to cover costs
  • Rare chains: May pass through actual costs


Withdrawal Fees


Network Fee: Actual blockchain fee (passed through)


Processing Fee: Flat fee per withdrawal


  • BTC: 0.0005 BTC
  • ETH: 0.005 ETH
  • Stablecoins: $5 equivalent


VIP Discounts: Reduced fees for high-volume traders


  • Tier 1: 0% discount
  • Tier 2: 25% discount
  • Tier 3: 50% discount
  • Tier 4: 75% discount


Security Features

Address Whitelisting


Optional Feature: Users can restrict withdrawals to pre-approved addresses


Activation Process:


  1. User adds address to whitelist
  2. 24-hour security delay
  3. Email + 2FA confirmation
  4. Address becomes active


Benefits: Prevents unauthorized withdrawals even if account is compromised.


Withdrawal Limits


Daily Limits (per tier):


  • Tier 1: $1,000
  • Tier 2: $50,000
  • Tier 3: $500,000
  • Tier 4: Unlimited (with monitoring)


Velocity Monitoring: Velocity_Score=Withdrawals24hAverage_Withdrawals30dVelocity_Score = \frac{Withdrawals_{24h}}{Average_Withdrawals_{30d}}Velocity_Score=Average_Withdrawals30d​Withdrawals24h​​


Alert triggered if score > 5.0 (5× normal activity).


Sanctions Screening


Real-Time Checks: Every withdrawal address screened against:


  • OFAC SDN list
  • UN sanctions list
  • EU sanctions list
  • UK sanctions list


Screening Latency: < 100ms per address


Match Handling:


  • Exact match: Withdrawal blocked, account flagged
  • Fuzzy match: Manual review required
  • No match: Proceed with withdrawal


Monitoring and Alerts

Real-Time Monitoring


Metrics Tracked:


  • Withdrawal success rate
  • Processing time (p50, p99)
  • Risk score distribution
  • Blockchain confirmation times
  • Hot wallet balance levels


Alert Thresholds:


  • Hot wallet < 3% of assets: Replenish from warm
  • Withdrawal queue > 1 hour: Investigate delays
  • Risk score spike: Enhanced monitoring
  • Blockchain congestion: Adjust fee estimates


Reconciliation


Daily Reconciliation: Internal_Balance=Deposits−Withdrawals−FeesInternal_Balance = Deposits - Withdrawals - FeesInternal_Balance=Deposits−Withdrawals−Fees


Compared against blockchain balances to detect discrepancies.


Monthly Audit: Full reconciliation of all chains with third-party verification.


Disaster Recovery

Blockchain Outages


Contingency Plans:


  • Switch to alternative chains for same asset
  • Communicate delays to users
  • Process from reserves when chain recovers


System Failures


Failover:


  • Automated failover to backup systems
  • Manual processing capability
  • Communication protocols


Recovery Time Objective (RTO): < 1 hour for withdrawal processing restoration.


Conclusion


use.com's deposit and withdrawal architecture provides secure, efficient processing through intelligent risk scoring, multi-chain support, and automated batching. By balancing security with user experience, the system enables fast deposits and withdrawals while maintaining robust protection against fraud and operational risks.



Previous: ← Wallet Infrastructure & Custody Model Next: Security Architecture →


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Updated on: 10/03/2026

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