Prove the facts your system generates even under audit.
ImmutableLog turns critical events into tamper-proof, cryptographically verifiable evidence — for auditors, regulators, and legal accountability.
ImmutableLog is infrastructure for provable history.
Why this matters
Auditors need evidence you cannot change.
Compliance requires proof, not just logs.
Legal disputes demand verifiable history.
The problem with traditional logs
Logs explain. They do not prove.
Traditional logs are written, stored, and controlled by the same systems and teams that operate the product. They can be altered, truncated, or lost. When an auditor, regulator, or legal team asks for evidence of what actually happened, you are left relying on trust in your own infrastructure. That is not enough.
- Malicious alteration: Logs can be modified to hide or distort events.
- Human error: Misconfiguration, retention policies, or mistakes can erase or corrupt the record.
- Loss of credibility in audit: When you cannot provide independently verifiable proof, auditors and regulators have no choice but to question the integrity of your processes.
What is ImmutableLog
ImmutableLog is a private, permissioned ledger for critical business events. Events are recorded once, hashed, and chained in blocks. The chain is immutable: no one can change the past without breaking the cryptographic proof. Third parties can verify that a given event was included and that the history was not tampered with, without having to trust the operator.
Private ledger: Your data stays in your environment. No public blockchain, no shared network with unknown parties.
Immutability: Once written, events cannot be edited or deleted. The chain is append-only.
Cryptographic proof: Each event has a deterministic hash; blocks are linked. Proof of inclusion can be verified by anyone with the public verification data.
Independence from operator trust: Verification does not depend on trusting the company that runs the system. The math speaks for itself.
What ImmutableLog is not
"ImmutableLog is not a public blockchain. It does not use cryptocurrency or tokens. It is not an analytics or observability platform. It is infrastructure for proof: making your event history verifiable and auditable."
How it works
At a high level, the flow is simple. No code required to understand the model.
Your system sends an event via API
The client (your application) submits the event to ImmutableLog. The payload is what you define: user action, config change, transaction, or any critical event you need to prove later.
The event is hashed
A deterministic hash is computed from the event. That hash uniquely represents the event and becomes part of the permanent record.
The event is included in a block
Events are batched into blocks. Each block is linked to the previous one, forming a chain. The structure allows verification of order and integrity.
Proof of inclusion can be verified at any time
Auditors, regulators, or your own systems can request a proof that a given event was included in the ledger and that the chain was not tampered with. Verification is cryptographic: it does not depend on trusting the operator.
# Step 1: Record critical event
curl -X POST https://api.immutablelog.com/v1/events \
-H "Authorization: Bearer YOUR_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"event_type": "admin_access",
"actor": "admin_01",
"action": "delete_database",
"timestamp": "2026-01-30T14:20:00Z"
}'
# Step 2: Receive proof of inclusion
# response:
# { "block_id": "48291", "hash": "0x4f2b...", "proof": "0x9a2e..." }See the Dashboard in Action
From quota tracking to cryptographic proof — everything your team needs to audit, investigate, and demonstrate compliance.
Monitor usage and filter with precision
Track your monthly event quota in real time. Filter by date, event type, time range, or transaction ID to find exactly what you need.
- Monthly quota progress
- Event type filter
- Time range selector
- Search by tx ID
Where Proof Replaces Trust
Every organization has moments of exposure. These are the ones where cryptographic evidence changes the outcome.
Prove Who Changed What — And When
An admin reconfigures a critical system. Weeks later, a client disputes the change. Your logs say one thing; their records say another.
ImmutableLog records every change with a cryptographic timestamp and unalterable proof of inclusion. Present it in any audit, dispute, or review.
Protect High-Value Transactions from Dispute
A contested transaction escalates. Was it authorized? By whom? At what exact moment? Your payment logs were rotated three weeks ago.
Every transaction enters the immutable ledger with a verifiable hash. The record stands in arbitration, regulatory review, or contract dispute.
Be Audit-Ready Without Scrambling
The auditor arrives with 48 hours' notice. Your team spends days reconstructing timelines across five systems. The scramble reveals gaps no one had mapped.
ImmutableLog maintains a continuous, verifiable chain of critical events. When the auditor asks, you export — not reconstruct.
Investigate Incidents Without Trusting Internal Logs
A data access incident occurs. Legal and HR need to know exactly who accessed what — but the application logs are controlled by the same team under investigation.
ImmutableLog operates independently of your application layer. Its records cannot be modified by the people being investigated.
Hold Privileged Access Accountable
DBAs, sysadmins, and support engineers have elevated access — and the ability to cover their tracks. How do you prove what they actually did?
Every privileged action is recorded immutably before it reaches your systems. Independent of the admin. Independent of the database. Verifiable by any auditor.
Satisfy Regulators Without Trusting Your Own Assertions
LGPD, SOC 2, ISO 27001, and sector regulators require you to prove — not just claim — that controls were applied. Self-reported logs are not enough.
ImmutableLog produces independently verifiable records. A regulator doesn't have to trust you. The cryptographic proof speaks without your input.
Resolve Contract Disputes Without Going to Court
A client claims your platform was unavailable on a specific day. Your dashboard says otherwise. Without third-party-verifiable evidence, you're in a credibility war.
ImmutableLog's event chain is presentable as verifiable evidence of system behavior. Not your word — proof with a cryptographic timestamp.
Trace Every Automated Decision in Your Pipeline
Your CI/CD, data pipelines, or autonomous systems make decisions at scale. When something fails — or is questioned — how do you prove what happened and that it wasn't altered?
ImmutableLog captures every automated decision as an immutable event. The chain of causality is preserved and verifiable — even months after the fact.
The audit doesn't announce itself. Your evidence layer should be ready when it arrives.
Main Segments
ImmutableLog is purpose-built for regulated industries where audit evidence is mandatory.
Fintechs & Financial Institutions
Payment fintechs, lending platforms, digital banks and payment operators regulated by BACEN. Resolution 4.893 requires immutable records of critical operations and access logs.
Mental Health & Digital Healthtech
Telepsychology, telepsychiatry, and digital health platforms handling sensitive medical records. CFM Resolution 1.821 requires immutable clinical documentation.
Notary Offices & Extrajudicial Services
Notary offices, registry offices and extrajudicial services regulated by the National Council of Justice. CNJ Provimento 213/2025 mandates digital audit trails.
Legaltech & Digital Law Firms
Legal management platforms, arbitration chambers, and digital law firms. Evidence of process integrity and decision traceability is required in legal disputes.
Public Sector & Government
Federal, state, and municipal bodies subject to Brazil's Access to Information Law and TCU audits. Immutable records are essential for transparency and public accountability.
Insurance & Insurtech
Insurance companies, insurtechs, and health plan operators regulated by SUSEP and ANS. Immutable records of claims, policy changes, and fraud investigations are essential for regulatory compliance and legal disputes.
Does your industry require provable audit trails?
Security and compliance
ImmutableLog is designed for environments that require proof and auditability.
Built for zero-failure environments
The ImmutableLog core is written in Rust — not for trend, but because an audit ledger has zero tolerance for memory failures, unpredictable latency, or data corruption.
Memory Safety
No buffer overflows, no use-after-free. Rust's ownership model makes memory vulnerabilities impossible by design — guaranteed at compile time, not by tests.
Zero GC Pauses
No garbage collector means no stop-the-world pauses. Audit events are written with consistent, predictable latency — even at peak load when it matters most.
Compile-time Correctness
Data corruption bugs are caught at compile time, never in production. If it compiles, it's memory-safe. The ledger's integrity starts at the language level.
Ready to add verifiable audit trails?
Request access or schedule a technical call.
Start securing your event history today