When the regulator asks what the AI did and when, "the logs show it" is not enough. The chain needs to be independently verifiable.

Self-reported audit logs are not audit evidence. Any system can write a log that says "action completed successfully at 14:32 UTC." The question regulators now ask — and the question courts increasingly ask — is whether that log is tamper-evident. Whether anyone could have altered it after the fact. Whether the timestamp is independently verifiable.

TeamSync's accountability architecture answers those questions with cryptography, not with assertions.

Merkle hash chain with external timestamping

Every event in TeamSync — document creation, modification, AI query, workflow execution, signature application — is anchored in a Merkle hash chain with external timestamping via a qualified timestamp authority. This means:

• Tamper-evidence is structural. Any modification to a historical record breaks the hash chain. Tampering is mathematically detectable, not just policy-prohibited.
• Timestamps are independently verifiable. The regulator does not need to trust TeamSync's clock. The timestamp authority provides independent verification that an event occurred at the stated time.
• The chain is exportable. At any point, the complete audit chain for any document, any workflow, any AI interaction can be exported to a regulator-readable format.

Blockchain-backed AI action records

TeamSync Sign uses blockchain-backed timestamping for every signature execution and every AI-assisted workflow action. This creates an immutable record of not just what the AI recommended, but what was approved by a human, what was executed, and in what sequence.

For FINRA examinations, FDA Part 11 audits, and EU AI Act compliance reviews, this record is the difference between a credible response and a remediation order.

DORA, EU AI Act, and systemic accountability requirements

DORA requires financial entities to maintain verifiable records of AI-assisted decisions affecting operational resilience. The EU AI Act requires audit logs for high-risk AI systems to be retained for at least 10 years. TeamSync's immutable chain satisfies both requirements without additional configuration.

Talk to a solutions engineer · Read: Tamper-evident audit chain · Read the Transparent pillar