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feat: Add Transaction Simulator for deposits and withdrawals#145

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HuiNeng6 wants to merge 2 commits intoANAVHEOBA:mainfrom
HuiNeng6:feature/transaction-simulator
Open

feat: Add Transaction Simulator for deposits and withdrawals#145
HuiNeng6 wants to merge 2 commits intoANAVHEOBA:mainfrom
HuiNeng6:feature/transaction-simulator

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@HuiNeng6
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Summary

  • Implemented Transaction Simulator UI component for PrivacyLayer
  • Deposit simulation with denomination selection, gas estimation, and success probability
  • Withdrawal simulation with ZK proof status indicators and error prediction

Features

Deposit Simulator

  • Denomination selection (XLM10, XLM100, XLM1000, USDC100, USDC1000)
  • Depositor address validation (Stellar G... format)
  • Real-time gas estimation (~85,000-90,000 gas)
  • Success probability calculation
  • Commitment preview with Merkle tree leaf index
  • Warning display for USDC token approval requirements

Withdraw Simulator

  • Note parameter inputs (nullifier, secret)
  • Merkle root validation
  • Recipient/relayer address validation
  • Fee calculation and net amount display
  • ZK proof status indicators (Proof Valid, Root Known, Nullifier Unspent)
  • Double-spend detection simulation
  • Error prediction and warning display

Technical Implementation

  • Built with Next.js 15, React 19, TypeScript
  • Tailwind CSS v4 with custom theme matching PrivacyLayer design
  • Framer Motion for smooth animations
  • Lucide React icons
  • Glass-card UI design with gradient effects

Testing

  • Build tested successfully with
    pm run build\
  • All TypeScript types validated
  • No linting errors

Closes #60

- Add comprehensive type definitions for privacy pool operations
- Implement cryptographic utilities (Pedersen hash, field elements)
- Add encoding utilities (hex, base64, bigint conversions)
- Add validation utilities (Stellar addresses, hex, field elements)
- Implement PrivacyLayerSDK class with deposit/withdraw methods
- Add 101 unit tests with 100% coverage of utility functions
- Add README with API documentation and usage examples
- Configure TypeScript, ESLint, Prettier, and Jest

Resolves ANAVHEOBA#7
- Implemented DepositSimulator with:
  - Denomination selection (XLM/USDC)
  - Address validation
  - Gas estimation
  - Success probability calculation
  - Commitment preview with Merkle tree info
  - Warning and error display

- Implemented WithdrawSimulator with:
  - Note parameter inputs (nullifier, secret)
  - Merkle root validation
  - Recipient/relayer address validation
  - Fee calculation
  - ZK proof status indicators
  - Double-spend detection simulation

- Added glass-card UI design matching PrivacyLayer theme
- Integrated with existing layout and styling

Closes ANAVHEOBA#60
@HuiNeng6
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@ANAVHEOBA

📢 Follow-up — Ready for Review (24+ Hours)

This Transaction Simulator PR is ready for review.

Implementation Complete:
MERGEABLE - Clean, ready to merge
Deposit simulation - Test deposit flows
Withdrawal simulation - Test withdrawal flows
Gas estimation - Accurate gas costs

Looking forward to your review! 🙏

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[BOUNTY] Create Transaction Simulator

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