Insurance companies had my data 5 years ago
I went to my GP to get a jab to travel. I told them I smoked cigarettes as it seems that a puff on a cigarette at new year counted. 3 years later when looking for life insurance, I was told I was a smoker, this was 2015. It would good to have some metadata that travels with the data so that it’s origin can be determined and where it has gone and can’t be used without it, just like a blockchain.