I've seen a lot of confusion around meeting strict compliance frameworks (like NIST 800-53, FedRAMP, PCI) when your stack uses agents. Auditors want proof that the agent software running is genuine, hasn't been tampered with, and that its telemetry is trustworthy. This is where hardware-backed attestation comes in.

You can't just rely on a config file. You need the hardware TPM/secure boot to vouch for your agent's integrity from boot to runtime. Here's a practical setup for IronClaw to generate cryptographically verifiable audit trails.

First, ensure your fleet is configured for secure boot and that the TPM is active. IronClaw's `ic-attestation` service handles the heavy lifting. The key config is in `/etc/ironclaw/attestation.yaml`:

```yaml
attestation_endpoint: "https://verifier.yourdomain.com/v1/challenge"
tpm_device: "/dev/tpm0"
measurement_logs: "/sys/kernel/security/tpm0/binary_bios_measurements"
quote_interval: 3600
extend_pcr_8: true
```

The agent will now periodically (every `quote_interval`) generate a TPM quote, which is a signed statement of the Platform Configuration Registers (PCRs). These PCRs contain the measured boot sequence. You ship these logs to your central verifier service and your SIEM.

The verifier side is critical. It must:
* Hold your golden reference values (known-good PCR measurements for your approved OS/agent stack).
* Validate the TPM quote signature against your platform's endorsement key certificate.
* Issue a time-stamped token for the SIEM if the quote is valid.

This gives you an immutable record: "At 2024-05-27T14:32:00Z, host `web-01` attested to running unaltered IronClaw agent v2.8.1 on a securely booted Ubuntu 22.04 kernel 5.15.0." You present this chain of evidence to auditors.

Without this, you're just showing them log files which could have been manipulated by a compromised host. The TPM quote is signed by a key that never leaves the hardware chip.