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Dylan Lim - Project Portfolio Page

Project: Crypto1010

Crypto1010 is a CLI blockchain wallet simulator for learning concepts such as wallet creation, transfers, validation, and persistence. My main scope was evolving the app from basic single-user wallet operations into a multi-account system with authenticated sessions, account-scoped persistence, and cross-account transfers.

Given below are my contributions to the project.

• Code contributed: Functional code (RepoSense)
• Representative merged PRs: #106, #133, #208, #210
• Enhancements implemented:
  • Implemented the early wallet-management foundation before the package rename from seedu.duke to seedu.crypto1010, including the Wallet model, WalletManager, ListCommand, and BalanceCommand.
  • Tightened command parsing and validation by enforcing the w/ prefix for create, the w/ prefix for balance, and rejecting wallet names with spaces.
  • Added history to display outgoing wallet transaction history.
  • Legacy SendCommand work: contributed earlier address-validation and transfer-flow refinements, including Bitcoin and Solana support at that stage, clearer insufficient-balance handling, self-transfer and balance-calculation fixes, and later the fix that made manual fee override correctly bypass speed validation. Some of that earlier address-support work has since been superseded by later changes to the command.
  • Refactored transfer execution into TransactionRecordingService to separate command parsing from transaction-recording logic.
  • Implemented authenticated multi-account support through AuthenticationService, PasswordHasher, AccountStorage, and account-scoped wallet/blockchain storage.
  • Implemented CrossSendCommand and CrossAccountTransferService for transfers between wallets owned by different authenticated accounts.
  • Added LogoutCommand so users can end the current session and switch accounts without restarting the application.
• Contributions to testing:
  • Added or expanded automated tests for AuthenticationService, account-scoped storage, CrossSendCommand, HistoryCommand, LogoutCommand, SendCommand, CreateCommand, ListCommand, and BalanceCommand.
  • Used tests to lock down parser changes and transfer edge cases such as insufficient balance, invalid wallet names, self-transfer behavior, and fee override handling.
• Contributions to the User Guide:
  • Documented startup authentication and account-scoped persistence behavior.
  • Added and updated command usage for crossSend, history, logout, and wallet-related command formats after parser changes.
  • Updated examples, FAQ entries, and data-storage notes to reflect the multi-account model.
  • Fixed User Guide table-of-contents and PDF anchor links so sections such as Quick Start, Startup Authentication, Command Summary, Data and Persistence, and FAQ navigate correctly.
• Contributions to the Developer Guide:
  • Added implementation details for authentication, account-scoped storage, and crossSend.
  • Documented wallet currency tagging, history, wallet persistence, and the transfer-recording design around TransactionRecordingService.
  • Updated the guide with account-switching design notes and command implementation guidance for future contributors.
• Contributions to team-based tasks:
  • Helped align command, storage, and transfer layers as the project moved from single-user behavior to authenticated multi-account sessions.
  • Kept tests and documentation in sync with behavior changes across wallet creation, transfer history, cross-account transfer, and logout/account switching.
  • Contributed project documentation updates for the User Guide, Developer Guide, About Us page, and team portfolio materials.
• Contributions beyond the project team:
  • Bug fixing and triaging (PE-D focus): reported bugs and suggestions for other teams during PE-D, and resolved multiple follow-up issues in our own project around command validation, send-flow behavior, and documentation correctness.
  • Representative fixes:
    • Fixed send so a manual fee/ correctly bypasses speed/ validation instead of being rejected inconsistently.
    • Fixed balance argument parsing by enforcing the w/ wallet prefix and tightening validation.
    • Fixed wallet-name handling by rejecting whitespace-containing names and tightening command argument validation.
    • Fixed send error handling and tests around insufficient-balance behavior.
    • Fixed broken User Guide table-of-contents and PDF anchor links so generated documentation navigation works correctly.
  • PE-D issue tracker: PE-D issues filed