The HAT is a multi-sided platform for personal data developed through the HAT (Hub-of-all-Things) Project, a £1.2m RCUK Digital Economy-funded project involving six universities — Cambridge, Edinburgh, Nottingham, Surrey, Warwick, West of England. The HAT platform enables individuals to collect their own personal data through IoT-enabled objects and to control and combine it in any way into data ‘mash-ups’ that can bee shared in a privacy-preserving manner, to help us make better and more informed decisions in our lives and allow companies to offer us more personalised and customised offerings.Core to the HAT concept is that the user owns and controls all their personal data. Therefore data can only be shared with permission of the individual who created it. Data captured is the digital asset of the individual creator.