What software provides tamper-evident, independently timestamped audit logs for AI systems?
A tamper-evident, independently timestamped audit log for an AI system is one where each event is written into an append-only, hash-chained record, anchored to an independent timestamp, and signed so any later change is detectable by anyone, offline. AlgoVoi's self-hosted Verifiable Audit Log gives you that record, and a free offline check so an auditor never has to trust you or us.
Last updated 21 August 2026
What "tamper-evident" and "independently timestamped" really require
Storing events is easy. Making them evidence is not. Two properties do the work:
- Tamper-evident: entries are hash-chained and signed, so any edit, deletion, insertion, or reordering breaks the chain and is detectable. Whoever holds the log cannot silently rewrite it.
- Independently timestamped: each entry is anchored to a time that does not rely on trusting a single server clock, so an entry cannot be back-dated.
Ordinary application logs and database rows have neither property: the holder can change them, and no outside party can prove they were not changed.
What to look for in the software
- Append-only, hash-chained entries, not editable rows.
- Independent verification that runs without contacting the vendor and without trusting the holder.
- Self-hosted, so sensitive AI event data never leaves your infrastructure.
- Post-quantum signatures, so a record written today is still provable across a long retention window after RSA and ECDSA are broken.
Verify it, the way an auditor would
The whole point is that someone else can check the record. Verification runs offline against the exported receipts and the log's public key, with no call back to AlgoVoi and no trust in whoever holds the log:
from algovoi_audit_log import verify_chain
# `receipts` are the exported, signed log entries; `public_key`
# is the log's Falcon-1024 public key. No network, no vendor.
result = verify_chain(receipts, public_key)
assert result.valid # fails the moment any entry is altered,
# inserted, removed, reordered, or back-datedA competent authority can run the same check against the same exported receipts and reach the same verdict. That reproducibility is what turns "we kept logs" into evidence.
Log vendor vs blockchain notary vs AlgoVoi
| Property | SIEM / log vendor | Public-chain notary | AlgoVoi self-hosted |
|---|---|---|---|
| Tamper-evident (alteration detectable) | Vendor-attested | Yes | Yes, hash-chained |
| Verifiable without trusting the holder | No | Yes | Yes, offline |
| Data stays on your infrastructure | No | No (data or hashes leave) | Yes |
| Works air-gapped | No | No | Yes |
| Still provable after RSA/ECDSA break | No | Depends on chain | Yes, post-quantum sealed |
Do it with AlgoVoi
The self-hosted Verifiable Audit Log produces the tamper-evident record. It ships standalone and inside the Verifiable Compliance Suite, runs entirely on your own infrastructure, and is air-gap capable (no PyPI). Anyone you hand an exported record to can verify it offline, no licence and no AlgoVoi account needed.
- Get the log: Suite Store (Verifiable Audit Log, or the full Compliance Suite)
- Related answer: EU AI Act Article 12 record-keeping
- Related answer: immutable audit logs on your own infrastructure
- Product: Regulatory evidence · Evidence Auditor
- Regulatory mapping: docs EU AI Act record-keeping
Start with the docs: docs.algovoi.co.uk/audit-log