Almost every paid FiveM anticheat lists "heartbeat protection" or "anti-tamper" on its feature page. Almost none of them explain what that means. So here is the actual mechanism, the failure modes that break cheap implementations, and the questions worth asking before you pay for one.
What a heartbeat does
Start with the problem. Your anticheat runs as a Lua resource on the client, which means a determined cheat can stop it from running. The cheat finds the resource in the loaded list, terminates it, swallows the error, and keeps going. From the server's point of view, that player now looks clean, because the AC went quiet and stopped reporting anything at all.
A heartbeat closes that gap. The client-side AC sends a small signed message to the server on a fixed interval, usually every one to five seconds. The server watches that interval and reacts when the messages stop arriving. Kick, flag, or ban, depending on how you configure it. If a cheat kills the client-side AC, the heartbeats stop, and the server acts on the silence instead of waiting for a report that will never come.
What makes a heartbeat actually work
A heartbeat is only useful if the cheat cannot fake it. Cheap implementations break at three specific points.
- Forgeable signing. If the payload is just a constant string like "ALIVE", a cheat can keep sending that same string after killing the AC, and the server has no way to tell the difference. A real heartbeat is signed with a per-session key that the server issues at connect time.
- Static intervals. If the heartbeat fires every 5.000 seconds on the dot, a cheat can replay the last legitimate message on schedule and the server never notices. A real heartbeat carries a server-issued nonce or a rolling counter, so every message is unique and ordered.
- Single-source verification. If the server only asks "did I get a message in the last N seconds," a forged message is enough to look clean. A real implementation cross-references the heartbeat with other signals, such as event timing, trust score, and session metadata, so a faked heartbeat on its own does not pass.
Where it sits in the detection stack
A heartbeat complements your other detection layers. It does not replace them. Each layer catches a different class of attack.
- Signature scan: known cheats running normally.
- Behavioral scoring: unknown cheats producing abnormal telemetry.
- Heartbeat: cheats that try to disable detection itself.
- Server-side event validation: cheats that attack handlers regardless of client state.
A cheater who kills the client-side AC runs into the heartbeat. A cheater who tries to forge the heartbeat runs into the signing and the nonce. A cheater who does both still has to get past server-side event validation. The point of the stack is that each layer covers the gap the others leave open.
Failure modes worth knowing
Heartbeats have a real cost. They generate noise on legitimate disconnects, and that noise gets worse on lower-bandwidth connections. Three cases come up constantly.
- Network drops. A player on a flaky home connection can legitimately miss heartbeats during a 30-second outage. A naive implementation kicks them. A tuned one waits for several missed beats and confirms with another signal before it acts.
- Client crashes. When the FiveM client crashes, the heartbeat stops with it. Kick immediately and the player sees a confusing "you were kicked" message instead of a clean disconnect. A sensible system treats the first 10 to 30 seconds of silence as a possible crash before escalating.
- High-latency regions. Players far from the server can have enough timing variance that a strict interval rule flags them. Per-server tunable intervals fix this.
None of these are architectural problems. They are tuning problems. So the real question when you evaluate a product is whether the vendor exposes the tuning knobs, the timeout, the escalation policy, the jitter tolerance, or buries all of it behind a single "enable heartbeat" toggle. If it is one toggle, you are stuck with their defaults whether or not those defaults fit your player base.
Practical takeaway
If you are evaluating an anticheat on heartbeat protection specifically, ask these five questions.
- Is the heartbeat signed with a per-session key issued by the server?
- Does the protocol include a server-issued nonce or rolling counter?
- What is the default timeout, and can you tune it?
- What happens on a missed heartbeat: kick, soft-ban, or flag for admin review?
- Does the system cross-reference heartbeat health with other signals before it acts?
A vendor who can answer all five clearly is running real anti-tamper. A vendor who waves at "heartbeat" as a marketing bullet is usually shipping the cheap version, the one that loses to a moderately competent cheat in about a week.
How Raven implements this
Raven's heartbeat is per-session, hardware-derived, and rotates on a timer. You will see competitors market a "dynamic heartbeat" as if it were a new idea, but the protocol they describe is the one Raven has shipped for years. Beyond the heartbeat itself, Raven Mind cross-references heartbeat irregularities against event-shape signals and trust-score history before any irreversible action. That last part is exactly the "cross-reference with other signals before acting" box you should be checking on any AC you consider, ours included.