@Albert ARIBAUD The Solid spec doesn't seem to cover that (based on a quick scan rather than a full audit, I admit), but there are various methods that could be put to use: * [Zero-knowledge proof](https://en.wikipedia.org/wiki/Zero-knowledge_proof) * [Differential privacy](https://en.wikipedia.org/wiki/Differential_privacy) * [Data anonymization](https://en.wikipedia.org/wiki/Data_anonymization) Back when the original iPod came out, I had similar ideas of my own to extend it to serve as this kind of *true* "pod" device to hold all kinds of personal information beyond music. These days, smart phones could essentially fill the same role. The problem will always be that anything valuable enough is going to be continually attacked until it can be pulled out of whatever "secure enclave" normally protects it. Sometimes the best you can hope for is the ability to digitally sign some piece of data you release into the world, so that your sharing of it can be validated. I even do that sort of thing myself for published blog comments like this one. 0441223716723dbf0b9b45b78562b4bed0aa044b1e716230a4cc2b5cc7b11d18