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Industrial Evidence Chain — Independent Verification Protocol

1. Mathematical Verification Model

The verification protocol provides mathematical certainty of data authenticity without relying on the integrity of the operational database or the word of system administrators.

[Candidate Verification Request: GET /api/evidence/{id}/verify]
                         |
                         v
      +-------------------------------------+
      | 1. Retrieve Operational State       |
      |    - Fetch Evidence Record from DB  |
      |    - Fetch Media File Hashes from DB|
      +------------------+------------------+
                         |
                         v
      +-------------------------------------+
      | 2. Re-execute Canonicalization      |
      |    - RFC-8785 strict key ordering   |
      |    - ISO-8601 UTC timestamp format  |
      |    - 6-decimal coordinate precision |
      |    - Ordinal media hash sorting     |
      +------------------+------------------+
                         |
                         v
      +-------------------------------------+
      | 3. Compute Candidate Digest         |
      |    H_candidate = SHA-256(JCS_Data)  |
      +------------------+------------------+
                         |
                         v
      +-------------------------------------+
      | 4. Fetch Ledger Trust Anchor        |
      |    H_ledger = Ledger.GetEvidence(id)|
      +------------------+------------------+
                         |
                         v
      +-------------------------------------+
      | 5. Constant-Time Equality Assertion |
      |    Compare(H_candidate, H_ledger)   |
      +------------------+------------------+
                        / \
                       /   \
         [Match: TRUE]       [Match: FALSE]
              v                    v
      +---------------+    +--------------------+
      | Status:       |    | Status:            |
      | VERIFIED      |    | INTEGRITY_MISMATCH |
      | isTampered: F |    | isTampered: TRUE   |
      | Confidence: 1 |    | Confidence: 0.0    |
      +---------------+    +--------------------+

2. Formal Verification Algorithm

Let an evidence record be defined as tuple: $$E = \langle \text{id}, \text{asset_code}, \text{activity}, \text{desc}, \text{lat}, \text{lng}, t_{\text{captured}}, \mathcal{M} \rangle$$ where $\mathcal{M} = {h_1, h_2, \dots, h_k}$ is the set of binary SHA-256 hashes of all attached media files.

Step 1: Canonical Serialization

Serialize $E$ into deterministic string $S$: $$S = \text{JCS_Encode}(E)$$

Step 2: Digest Recalculation

Compute candidate hash $H_c$: $$H_c = \text{SHA-256}(S)$$

Step 3: Blockchain Truth Retrieval

Query distributed ledger for immutable anchor state $A$: $$A = \text{BlockchainLedger}.\text{Query}(E.\text{id})$$ $$H_b = A.\text{evidenceHash}$$

Step 4: Verification Evaluation

The verification predicate $V(E)$ is defined as: $$V(E) = \begin{cases} \text{VERIFIED} & \text{if } H_c = H_b \ \text{INTEGRITY_MISMATCH} & \text{if } H_c \neq H_b \end{cases}$$

3. Tamper Detection Sensitivity & Avalanche Effect

Because SHA-256 exhibits the Avalanche Effect, any single-bit mutation anywhere in the operational database results in an average 50% change in the generated hash digest.

Empirical Demonstration:

Original Record:

  • Description: "Routine turbine vibration analysis and lubrication check."
  • Candidate Hash: 5285fb70c383f23a9d9e6e8eebf82b8b9310bfbaae9ea2cf4b64f4ecf9ce152c
  • Blockchain Hash: 5285fb70c383f23a9d9e6e8eebf82b8b9310bfbaae9ea2cf4b64f4ecf9ce152c
  • Result: VERIFIED (Confidence: 100%)

Tampered Record (Single Character Change: . removed):

  • Description: "Routine turbine vibration analysis and lubrication check"
  • Candidate Hash: d748f3992a6c1e13b83b924400a40234e70b53c1537bfa07d4b29352e46b9ec1
  • Blockchain Hash: 5285fb70c383f23a9d9e6e8eebf82b8b9310bfbaae9ea2cf4b64f4ecf9ce152c
  • Result: INTEGRITY_MISMATCH (Tamper Detected: True)

4. Auditor Certificate of Verification

When an evidence record is verified through the web UI or API, the verification engine produces a verifiable JSON response payload that can be archived or exported as an official compliance certificate:

  • Evidence ID and Asset Identifier
  • Blockchain Transaction ID and Block Height
  • Block Commit Timestamp
  • Candidate Hash vs. Blockchain Hash
  • Cryptographic Signature of the Verifying Auditor (optional)