  The Internet-of-Things (IoT) is an imminent and corporal technology that
enables the connectivity of smart physical devices with virtual objects
contriving in distinct platforms with the help of the internet. The IoT is
under massive experimentation to operate in a distributed manner, making it
favourable to be utilized in the healthcare ecosystem. However, un- der the IoT
healthcare ecosystem (IoT-HS), the nodes of the IoT networks are unveiled to an
aberrant level of security threats. Regulating an adequate volume of sensitive
and personal data, IoT-HS undergoes various security challenges for which a
distributed mechanism to address such concerns plays a vital role. Although
Blockchain, having a distributed ledger, is integral to solving security
concerns in IoT-HSs, it undergoes major problems, including massive storage and
computational requirements. Also, Holochain, which has low computational and
memory requirements, lacks authentication distribution availability. Therefore,
this paper proposes a hybrid Holochain and Blockchain-based privacy
perseverance and security framework for IoT-HSs that combines the benefits
Holochain and Blockchain provide, overcoming the computational, memory, and
authentication challenges. This framework is more suited for IoT scenarios
where resource needs to be optimally utilized. Comprehensive security and
performance analysis is conducted to demonstrate the suitability and
effectiveness of the proposed hybrid security approach for IoT-HSs in contrast
to the Blockchain-only or Holochain-only based approaches.
