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.
Device identity
In developmentEach 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.
Data signing chain
In developmentEach 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.
Probe requirements
CurrentMeasurements follow established reference methods: turbidity per EPA Method 180.1, pH per EPA Method 150.1, and ORP per Standard Method 2580B.
Installer credentialing
In developmentInstallations will be performed by BlueSignal Certified Installers — requiring ASSE 5110/5120 backflow certification plus BlueSignal commissioning training. The certification program is in development.
Third-party audit cadence
In developmentAn 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.