# Phase 10 — Wallet and Immutable Ledger Report

## Completion status

Phase 10 is complete. The application now has an atomic double-entry posting service, linked reversals, authoritative wallet views, transactional snapshot rebuilding, reconciliation helpers, and authenticated wallet/history APIs.

## Delivered components

- Migration `015_harden_ledger_integrity.sql` adds posted-time consistency, authoritative posted/reversed balance views, and database-level append-only triggers.
- The ledger repository uses parameterized SQL and locks all involved wallet accounts in deterministic numeric order.
- The ledger service validates bounded integer amounts, closed transaction/account types, balanced entries, safe references, descriptions, and metadata.
- User-owned accounts cannot become negative; unbalanced or partially persisted postings fail closed.
- Idempotency keys are HMAC-digested, request payloads are fingerprinted, identical replays are stable, and changed replays are rejected.
- Reversals append exact opposite entries and retain immutable links to the original transaction.
- A successful post and all affected user snapshot rebuilds commit in the same MySQL transaction.
- Reconciliation compares or repairs projections from authoritative ledger data under account locks.
- `GET /api/v1/wallet` returns authoritative decimal-string amounts and projection health.
- `GET /api/v1/wallet/history` uses signed keyset pagination and exposes only the authenticated user's public history fields.
- Dashboard balance reads now use the authoritative user-balance view.

## Security boundaries verified

- No public API can submit an amount, post a ledger transaction, edit an entry, or set a wallet balance.
- Only posted/reversed transactions affect authoritative balances; pending entries are excluded.
- Account rows are locked before balance decisions and negative-balance checks.
- SQL values and history cursors remain parameterized; cursors are integrity-protected.
- Raw idempotency keys, internal IDs, private metadata, and ledger internals do not cross the public API boundary.
- Ledger entries cannot be updated or deleted, and transaction deletion is blocked by database triggers.
- The free-only reward feature remains zero-cost and purchase-free; Phase 10 adds no paid or stake-based mechanism.

## Verification result

The full automated suite passes **165 of 165 tests**. Coverage includes ledger validation, posting atomicity, idempotent replay and mismatch rejection, insufficient-funds handling, exact reversal behavior, large minor-unit strings, projection checks and repair, signed cursor tamper rejection, API authentication/validation, append-only SQL guards, deterministic locking, parameterization, all previous authentication/security behavior, and migration tooling.

The Phase 10 quality gate also runs linting, formatting checks, environment-template validation, database-schema verification, CSS builds, and project-layout verification. Dependency audit and release archive checks are performed during handoff.

## Operational boundary

No live MySQL database, Telegram account, Admin account, Redis deployment, payout provider, or external balance was accessed or modified. Migration application and production reconciliation remain explicit operator actions.

**Phase 10 status: COMPLETE AND VERIFIED.**