Does Watch Lite SE measure blood oxygenation (SpO2)?

Yes, thanks to the innovative clinical-grade sensors, Watch Lite SE is a pulse oximeter, and it can measure the peripheral oxygen saturation (SpO2) level with a non-invasive and safe method. You can constantly monitor the oxygen saturation, and prevent issues related to poor blood oxygenation. 

Does the Watch Lite SE device use the Blockchain to save the data?