pillar

Audit Records That Can Be Verified Independently

For years, "we have a database log" was enough to satisfy a regulator asking whether records had been altered. That's no longer the standard, because self-attested logs turned out to be exactly that: a record the company itself could have changed.

The current standard is cryptographic. The audit log is anchored to a Merkle hash chain. The chain root is published to an external timestamp authority. Any modification to any event invalidates the chain, and the invalidation is mathematically detectable by a third party.

That's tamper-evident audit. It's the foundation of every other defensibility argument the regulator will ask for. TeamSync was built on it from day one.

Talk to the security solutions team · See the CISO + Audit Committee page · Read the regulator-by-regulator coverage

What "Tamper-Evident Audit" Means

Every event on the platform writes to the audit chain the moment it happens, not at the end of the day or on a batch cycle. Each event gets a cryptographic hash that becomes part of the chain.

Event category

What's anchored

Document lifecycle

Upload, edit, version, archive, delete

Permissions

Grant, revoke, role change, rule change

Identity

Login, MFA, session events, key rotation

AI

Retrieval, generation, citation, agent action

Signatures

Signature ceremony, witness, validation event

Holds and discovery

Hold creation, custodian notification, collection, production

Workflow

Step execution, approval, escalation, completion

Configuration

Rule change, overlay activation, retention policy update

If a regulator asks for the complete history of a specific document, the answer is a chain segment. That segment can be verified independently, without relying on TeamSync's word for it.

What Changes When The Chain Gets Verified

Two design choices make the chain independently checkable, not just internally consistent.

Continuous external anchoring

The chain's root hash is published to an external timestamp authority on an ongoing basis. Because that authority's records sit outside TeamSync, a regulator can check the chain's integrity without depending on anything TeamSync says about it.

Per-tenant chain isolation

Each customer has their own separate chain. A regulator reviewing one customer's chain never sees another customer's data. This separation is enforced by the platform itself, not by application-level rules that could be misconfigured.

Here's what that verification looks like in practice:

Step

What happens

1. Regulator's auditor receives a chain segment

A signed, timestamped artifact, verifiable by a third party

2. Auditor's tooling computes the hash of the events

Using standard cryptographic methods, nothing proprietary

3. Tooling compares the hash against the published anchor

A yes-or-no result

4. If it matches, the records are confirmed unaltered

Proven mathematically, not asserted by TeamSync

5. If it doesn't match, the alteration is detected

And its location in the chain can be identified

What This Means For Your Organization

For security and compliance teams, this changes how long routine audit work actually takes.

Activity

Before tamper-evident audit

With TeamSync

Quarterly audit-evidence assembly

A multi-week project

Generated automatically

Responding to a regulator inquiry

14–21 days

Hours

Verifying audit-log integrity

Manual, done periodically

Continuous, checkable anytime

Defending the audit trail's integrity

An argument about internal process

A cryptographic proof

Reusing evidence across compliance frameworks

Manual, redone for each one

Native, shared across frameworks

What You Keep

Adopting cryptographic audit doesn't mean replacing your existing controls or adding new process. The chain runs underneath everything the platform already does; there's nothing extra to operate.

The regulators below have published guidance accepting it:

  • FINRA / SEC Rule 17a-4 — the 2022 audit-trail amendment explicitly accepts cryptographically verified audit evidence as an alternative to WORM media

  • FDA 21 CFR Part 11 — accepts cryptographic audit evidence for electronic records and signatures

  • DORA — cryptographic audit is contemplated under Article 9 (ICT systems integrity)

  • EU AI Act — Article 12 logging requirements are met by cryptographic audit

  • Basel III / IV operational risk — cryptographic audit accepted as evidence of control integrity

For the per-regulator detail, see the compliance overlays.

How TeamSync Compares

Most platforms rely on one of two approaches, and each has a gap this closes:

  • Self-attested database logs — the company can technically produce a log, but nothing stops the company itself from having altered it. A regulator has to take the log on trust.

  • Periodic manual reconciliation — audit evidence gets pulled together for each review or inspection, which is why it takes weeks and covers only what was asked for at the time.

  • TeamSync's cryptographic chain — every event is anchored at the moment it happens and verifiable independently, so there's no reconciliation project and no trust gap to explain.

Read Further

Talk to the security solutions team