Is Your Smartwatch Giving Away Your Identity? Why “Sharing Wisely” is the Future of Health Research

If you wear a fitness tracker or a smartwatch, you probably enjoy seeing your daily step count or heart rate. But have you ever stopped to wonder what happens to that data when you participate in a health study?

A recent paper by mDOT Center researchers at the University of Memphis and UC San Diego reveals that your “digital footprints” might be more personal than you realize.  While researchers have long tried to protect privacy by removing names and addresses from study data, new evidence shows that the way you move is actually a unique biometric signature – akin to a fingerprint.

In fact, the study found that:

• A single day of movement data from a wearable device could identify a person with 96% accuracy.
• Just 10 steps of walking may be enough to uniquely identify someone.

The Challenge: Open Science vs. Your Privacy To speed up medical breakthroughs, the National Institutes of Health (NIH) now requires researchers to share their data with the wider scientific community.

This “Open Science” approach is great for discovery, but the authors warn that current rules haven’t caught up to how powerful AI and machine learning have become at re-identifying people from their movement patterns.

Sharing More Wisely The goal isn’t to stop sharing data—it’s to do it more safely. The team suggests that we need to “share more wisely” by using better technology to “scramble” identifying patterns before sharing, and creating stricter, enforceable legal agreements that prevent anyone from trying to figure out who a participant is.

Principles into Practice To help turn these ideas into action, mDOT Center researchers have contributed to the WristPrint digital toolbox. This resource includes a self-paced online learning module designed to help researchers and those who oversee study safety understand how to balance the need for open science with the absolute necessity of protecting your privacy. By providing practical examples and guidance on how to share data more safely, this toolbox ensures that the next generation of health discoveries can move forward without putting your personal identity at risk.

By updating how we handle this high-tech data, we can keep the trust of the public while still making the scientific progress we all rely on.