Dopokaz: Cash Handover

Dopokaz is a structured audit workbench designed for cashiers, shop managers, and bookkeepers resolving disputed, ambiguous, or confusing cash-handover records.

When a shift closes with a cash variance, an unattributed pickup slip or an undocumented transfer can leave the source of a shortage uncertain. Conventional single-total cash calculators cannot represent competing explanations across multiple cash points. Dopokaz models entered records as a connected custody network, computing mathematically permitted variance intervals across tills, drawers, and safes without guessing or assigning personal blame.

CUSTODY TRANSFER ROSETTE
Visualize cash movement across defined locations. Nodes represent safes, cash drawers, and handover checkpoints. Directed connections trace documented transfers, receipts, and cash drops with attributed timestamps and amounts. An accessible ordered transfer table provides an equivalent structured view for high font-scaling and screen-reader navigation.

JOINT VARIANCE INTERVAL ENGINE
Instead of forcing a single explanation, Dopokaz calculates bounded variance intervals across all cash locations simultaneously. The engine analyzes opening counts, closing counts, intermediate pickups, and declared accounting assumptions to establish what the entered records can and cannot prove.

OPPOSING INTERPRETATIONS
Compare alternative interpretations of the same record set. If an unattributed $200 pickup could have originated from Till 1 or Till 2, the app retains both valid hypotheses, displays the resulting variance for each location side by side, and highlights the specific missing document or question that would distinguish between them.

OPENING AND CLOSING COUNTS
Record opening and closing cash counts at each location and combine them with cash-movement reports. Each saved edit keeps a case revision entry.

ENCRYPTED LOCAL STORAGE
All case records, calculations, and attached notes are stored strictly on-device using chunked AES-256-GCM envelope encryption with its master key managed by Android Keystore. The application requests zero network permissions, ensuring data remains on your physical device. Cloud auto-backup is disabled to prevent unencrypted cloud synchronization.

ENCRYPTED EXPORT AND RECOVERY
Export portable audit summaries or generate encrypted case recovery archives (.dpkz) protected with PBKDF2WithHmacSHA256 key derivation and AES-GCM encryption. Archive extraction enforces strict decompression bounds to protect against corrupted files.

OBJECTIVE BOUNDARY CONTRACT
Dopokaz is an analytical tool for evaluating entered documentary evidence. All findings represent permitted interpretations of entered records under declared assumptions. The application cannot establish the physical history of banknotes, does not identify individual responsibility, and is not a substitute for qualified accounting advice, wage deduction calculations, or legal certification.