PDF report signing and evidence chain

How PerfectLum/EPD/Chroma sign reports, embed measurement metadata, and survive long-term archival.

Context

This technical note is intended for integrators, engineering teams, and customers who want to understand the implementation underneath QUBYX products.

Technical detail

We work through the relevant data model, measurement pipeline, and verification steps. Where helpful, we point to existing standards and our deviations from them.

References

• Internal engineering note
• Public standard documentation
• QUBYX SDK reference

For deeper integration questions, contact engineering@qubyx.com.