  Today's world is a globalized and connected one, where people are
increasingly moving around and interacting with a greater number of services
and devices of all kinds, including those that allow them to monitor their
health. However, each company, institution or health system usually store its
patients' data in an isolated way. Although this approach can have some
benefits related with privacy, security, etc., it also implies that each one of
them generates different, incomplete and possibly contradictory views of a
patient's health data, losing part of the value that this information could
bring to the patient. That is the reason why researchers from all over the
world are determined to replace the current institution-centered health systems
with new patient-centered ones. In these new systems, all the health
information of a patient is integrated into a unique global vision. However,
some questions are still unanswered. Specifically, who should store and
maintain the information of a given patient and how should this information be
made available for other systems. To address this situation, this work proposes
a new solution towards making the Personal Health Trajectory of patients
available for both, the patients themselves and health institutions. By using
the concept of blockchains' federation and web services access to the global
vision of a person health can be granted to existing and new solutions. To
demonstrate the viability of the proposal, an implementation is provided
alongside the obtained results in a potential scenario.
