Audit log: A chronological, tamper-resistant record of actions in a system (who, what, when and on which data), kept so that events can be reviewed and reconstructed later.
Also known as: Audit trail, Activity log
Key takeaways
- An audit log answers four questions: who, what, when and on which data.
- Audit logs are only useful if ordinary users cannot edit or delete them.
- In messaging, two things matter: a reviewable record of conversations and a record of who accessed it.
- In C Chat, team owners and admins can audit and export the team's group conversations.
- Direct messages between people are private; platform access for moderation or legal requirements is logged.
When something goes wrong at work, the first question is usually “what happened, and who knew?” An audit log is the tool that answers it. Without one, a company is left reconstructing events from memory and screenshots on personal phones.
An audit log: a plain definition
An audit log is a record that captures events in the order they occurred. Each entry typically includes:
| Field | Example |
|---|---|
| Actor | A user, an admin or an automated process |
| Action | Viewed, created, edited, deleted, exported |
| Time | Date and time stamp |
| Object | The message, group, file or account affected |
The defining feature is trust. A log that anyone can quietly edit is a diary, not an audit trail. That is why audit records are usually stored separately from everyday data and protected from changes by the people whose actions they describe.
How it works
Systems generate audit entries automatically whenever a relevant action occurs. In a messaging context, the relevant actions fall into two layers:
- The conversation record itself. Messages, replies, edits, deletions, files and timestamps in a work group form a history that can be reviewed.
- Access to that record. Who opened, searched or exported the history, and why.
Both layers matter. A complete chat history with no record of who accessed it invites misuse; a perfect access log with no conversation history leaves you with nothing to review. Compliance teams usually want both, which is why this term sits close to data retention (how long records are kept) and data residency (where they are kept).
Why it matters for business messaging
Work conversations increasingly contain decisions: approvals, incident reports, instructions to staff in the field, client complaints. When those decisions live in personal chat apps, the company has no reliable record. Practical consequences include:
- Disputes you cannot settle. A client says the instruction was never given; the only proof is on a former employee’s phone.
- Incidents you cannot reconstruct. Nobody can show the sequence of messages before an accident or a security event.
- Contracts you cannot satisfy. Some clients, including those in public-sector supply chains, expect vendors to keep records of operational communication. See messaging for government contractors.
A structured approach to keeping compliant chat records starts with choosing a tool where the company, not the individual, controls the work history.
How it relates to C Chat
C Chat uses what it calls auditable encryption. Messages travel over TLS and are stored encrypted with AES-256 using a key specific to your organization. Because the business keeps oversight, team owners and admins can audit and export the team’s group conversations.
Two boundaries define the model:
- Direct messages between people are private. They are not part of the team’s audit or export.
- Platform access is limited and logged. The C Chat platform only accesses content to moderate reported messages or for legal requirements, and that access is recorded.
For security companies using CGuard Pro, auditing extends to site groups and security-related chats between guards and the office.
Related terms and common misconceptions
- “An audit log means the boss reads everything.” Not necessarily. A well-designed system limits what can be audited and records who looked. In C Chat, private direct messages are excluded.
- “Exporting chats is the same as an audit log.” An export is a copy of the record at a moment in time; the audit trail is the ongoing history. Exports are useful for disputes; read exporting chats for compliance and disputes.
- “Audit logs are only for regulated industries.” Any team that makes decisions in chat benefits from a trustworthy record.
Related concepts: legal hold, retention policies (see the chat data retention starter guide) and the broader C Chat compliance overview.
Getting started
If your team’s decisions currently live in personal groups, move them to a space the company controls. Create a team in the web app at getcchat.com/c, set up groups for each site or department, and assign owners and admins who will be responsible for reviews. C Chat is free for now, within the limits on the pricing page.
Frequently asked questions
What is the difference between an audit log and an activity log?
The terms overlap. An activity log usually shows routine events for convenience, while an audit log is kept specifically as evidence: it is complete, time-stamped and protected from editing so it can be trusted in a review or investigation.
What should an audit log contain?
At minimum, the identity of the person or system that acted, the action taken, the date and time, and the object affected. Good audit logs also record the source of the action and are stored so ordinary users cannot alter them.
Can team admins in C Chat read everything?
No. Team owners and admins can audit and export the team's group conversations. Direct messages between people stay private and are not part of that audit.
Does C Chat log when the platform accesses content?
Yes. The C Chat platform only accesses message content to moderate reported messages or to meet legal requirements, and that access is logged.
How long should audit records be kept?
It depends on your industry, contracts and local law. Many companies set a retention period in their written policy; confirm the right period for your business with your legal counsel.