CASE STUDY / Academic project

LexChain

Integrity and traceability concepts for digital evidence workflows.

A case study exploring how hashes, timestamps and controlled roles can support evidence integrity and chain-of-custody reasoning.

Tools

Solidity · Hardhat · Blockchain · Hashing · RBAC · IPFS concepts

Read the assessment
01 / Overview

From context to a defensible security objective.

Context

Academic application concept using fictitious evidence records and no real case data.

Objective

Explore a transparent, verifiable model for recording evidence lifecycle events without exposing evidence content on-chain.

Scope
  • Evidence hash registration
  • Integrity verification
  • Timestamped events
  • Role-based actions
Challenges
  • Keep sensitive evidence content off-chain.
  • Separate integrity proof from authorization and privacy controls.
Results
  • Integrity workflowDefined a minimal integrity workflow around hashes and timestamped events.
  • Security boundariesDocumented where blockchain does not replace access control, privacy or evidence-handling policy.
02 / Methodology

A repeatable path from discovery to validation.

  1. 01Model
  2. 02Threat assess
  3. 03Prototype
  4. 04Verify
  5. 05Review
03 / Architecture

Security boundaries made understandable.

Only evidence metadata and integrity proofs are represented in the illustrative flow.

Evidence lifecycle

  1. Evidence reference
  2. Hash
  3. Timestamped block
  4. Verification
  5. Audit trail

Illustrative architecture only — no real organization, internal address, hostname or confidential topology is represented.

Tools
  • Solidity
  • Hardhat
  • Blockchain
  • Hashing
  • RBAC
  • IPFS concepts
06 / Lessons learned

What the work changed in the way security is approached.

01

Immutability supports integrity evidence but does not guarantee input quality.

02

Privacy and authorization must be designed independently from the ledger.