Yes, registration is mandatory for Boots and Hearts 2017. The boring answer is that it personalizes your wristband which helps if it is ever lost or stolen. You will also be able to use it as a digital wallet to make cashless purchases on-site.
When contacting customer support, please include your wristband UID and security code. Please reach out to their support team if you have further questions.
Boots & Hearts: 1-647-479-9945