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Technology
5 March 2026
7 min read

# Understanding Document Integrity: DIN, QR Codes, and Tamper-Proof Estate Documents

Every document generated by Wasiyat carries a unique DIN, a scannable QR code, and a SHA-256 hash. Learn how these layers work together.

## Why Document Integrity Matters in Estate Planning

An Islamic will is only as trustworthy as its verifiability. In Indian courts, contested documents are common in succession disputes. Without a mechanism to prove a document has not been altered after signing, families face costly litigation and uncertainty during an already difficult time. Wasiyat addresses this with a three-layer integrity system: DIN, QR codes, and SHA-256 cryptographic hashing.

## Layer 1: The Document Identification Number (DIN)

Every finalized document in Wasiyat receives a unique DIN in the format WV/YYYY/XX/NNNNN — where YYYY is the year, XX is the state code (KA for Karnataka, KL for Kerala, etc.), and NNNNN is a sequential number. This DIN is printed on every page of the document and registered in our immutable audit ledger. Anyone can verify a DIN at wasiyat.com/verify to confirm the document's authenticity, generation date, and current status.

## Layer 2: QR Code Verification

Each document includes a scannable QR code that links directly to the verification page. Executors, witnesses, or beneficiaries can scan the code with any smartphone camera to instantly verify the document's status, the date it was generated, and whether it has been superseded by a newer version. This is especially useful for executors working in courts across different states.

## Layer 3: SHA-256 Cryptographic Hash

The most technically robust layer is the SHA-256 hash. When a document is finalized, Wasiyat computes a cryptographic hash of the entire document content — including all calculation inputs, family structure, share assignments, and citations. This hash is displayed on the document and stored in our database. Even a single character change in the document would produce a completely different hash, making any tampering immediately detectable.

## How the Three Layers Work Together

The DIN provides human-readable identification. The QR code provides instant mobile verification. The SHA-256 hash provides mathematical proof of integrity. Together, these three layers create a verification system that Indian courts, Islamic scholars, and family members can all trust. No single layer depends on the others — each provides independent verification.

## Practical Implications for Families

For families dealing with estate distribution, this integrity system means: (1) Executors can prove to banks and registrars that the will is genuine. (2) Heirs in different cities can independently verify the same document. (3) Courts can confirm document authenticity without calling witnesses. (4) Multiple copies of the same document carry identical verification data. The system is designed for Indian conditions — where families are often distributed across states, and estate proceedings may involve multiple jurisdictions.

Disclaimer: This article is for educational purposes only and does not constitute legal or religious advice. For guidance specific to your situation, consult a qualified Islamic scholar or attorney.

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