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Verification protocol

The verification protocol

How a reading becomes a credit you can trust — device, data, probes, installers, and independent audit. We mark what’s in use today versus what’s on the roadmap, so nothing here overstates current hardware.

05
Stages in the chain
01
Current today
04
In development
  1. 01

    Device identity

    In development

    Each WQM-1 will carry an ATECC608A secure element that gives the device a unique, tamper-resistant cryptographic identity. Planned for the next hardware revision — current boards do not yet include it.

  2. 02

    Data signing chain

    In development

    Each reading is signed with ECDSA at the device and verified in the cloud, so a reading’s origin and integrity can be checked end to end. Rolls out with the secure-element hardware revision.

  3. 03

    Probe requirements

    Current

    Measurements follow established reference methods.

    • Turbidity · EPA Method 180.1
    • pH · EPA Method 150.1
    • ORP · Standard Method 2580B
  4. 04

    Installer credentialing

    In development

    Installations will be performed by BlueSignal-trained installers — carrying standard backflow certification plus BlueSignal commissioning training. The program is in development.

  5. 05

    Third-party audit cadence

    In development

    An accredited third party will sample 25% of participating sites each year, confirming the continuous sensor record against independent lab measurements. Begins with the first live deployments.

“In development” items are part of the published methodology but are not yet live on current hardware or in operation. Target: protocol publication Q3 2026.