Blockchain for Electronic Vaccine Certificates: More Cons Than Pros?

Area of Science:

• Public Health
• Information Technology
• Digital Health

Background:

• Electronic vaccine certificates (EVCs) for COVID-19 are expected to become prevalent.
• Blockchain (BC) technology is a proposed platform for EVCs due to its distributed ledger.
• Understanding of BC principles is limited among healthcare professionals.

Purpose of the Study:

• To explain blockchain technology in an accessible manner for healthcare professionals.
• To evaluate the benefits and drawbacks of using BC for EVCs.
• To determine the suitability of BC for practical EVC implementation.

Main Methods:

• Descriptive explanation of blockchain principles (cryptography, distributed immutable ledger).
• Analysis of BC's suitability for EVC requirements, focusing on data privacy and centralized authority needs.
• Comparison with alternative cryptographic solutions.

Main Results:

• Blockchain's distributed nature can undermine the essential role of centralized authorities in vaccine status verification.
• Cryptography, a core BC principle, can facilitate secure sharing of vaccination records.
• Centralized authorities are crucial for vaccine distribution and administration, making distributed systems less effective.

Conclusions:

• Blockchain technology is not well-suited for electronic vaccine certificates.
• Alternative cryptographic approaches outside of blockchain can better support necessary centralized authority functions.
• Practical EVC platforms require integration with centralized systems for effective implementation.