In this paper, we propose a blockchain-based cold chain technology for
vaccine cooling track. The COVID-19 pandemic has caused the death of
millions of people. An important step towards ending the pandemic is
vaccination. Vaccines must be kept under control temperature during the
whole process, from fabrication to the hands of the health professionals
who will immunize the population. However, there are numerous reports of
vaccine loss due to temperature variations, and, currently, people
getting vaccinated have no control if their vaccine was kept safe.
Blockchain is a technology solution that can provide public and
verifiable records. We review the World Health Organization (WHO) cool
chain and Blockchain technology. Moreover, we describe current IoT
temperature monitoring devices and propose Blockcoldchain to track
vaccine cold chain using blockchain, thus proving an unalterable vaccine
temperature history. Our experimental results using smart contracts
demonstrate the system’s feasibility.