Legal disputes
Claiming "the logs were not altered" carries no weight on its own in court. A cryptographic chain provides mathematical proof — independently verifiable by an expert witness.
COMPLIANCE · AUDIT HASH CHAIN
Cryptographic Audit Hash Chain — Verifiable Evidence
Every audit record is mathematically chained to the next. Retroactive change is impossible — any tampering breaks the chain and is detected the moment verification runs.
Why it matters
"The logs cannot be altered" stops being a claim and becomes mathematical proof:
GDPR / KVKK audits
When a supervisory authority asks for proof of audit record integrity, the chain verification report is the answer. It operationalises the security obligation under GDPR Article 32 and KVKK Article 12.
ISO 27001 + SOC 2
For independent audit firms, "log immutability" is a gold-tier control point. An audit hash chain makes this control testable and reproducible.
How it works
Three hash fields — a simple but unbreakable mathematical chain:
- 01
Every record is chained
Each row in the audit log carries three hash fields: prevHash (the previous record's hash), entryHash (a hash of this record's contents), and chainHash (a combination of the two). These three values mathematically tie the chain together.
- 02
Retroactive change is impossible
Modifying an old record would require recomputing and overwriting every chainHash that follows. This breaks timestamps and is detected the instant verification runs.
- 03
Verification is mathematical
During verification the server recomputes each record one by one and compares against the stored chainHash. If a single record is corrupted, its id and timestamp are reported — actionable for forensics.
Tenant self-service
From /settings/compliance/audit-chain in the panel, every tenant can verify the integrity of
their own chain independently — without raising a support ticket, with a single click.
- Panel: Settings → Compliance → Audit Hash Chain
- Chain summary: record count, latest chainHash, first/last entry timestamps
- "Verify Chain" button: one-click integrity check
- Result: all valid (green) or broken entry id (red + audit reference)
- PDF export: for supervisory authority, ISO auditor, or court filing
- Standard on all plans — not Enterprise-exclusive
Related features. The audit hash chain operates alongside Legal Hold
— every legal preservation event is recorded into the chain, so the process itself becomes
verifiable. The full enterprise security suite: Enterprise Security.
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