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Related Concept Videos

Issues And Trends In Healthcare Delivery System01:29

Issues And Trends In Healthcare Delivery System

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The issues and trends in healthcare delivery are constantly changing. The COVID-19 pandemic is one recent issue that wreaked havoc on healthcare systems, causing a shortage of healthcare workers, high demand for medicines and supplies, and increased medical expenditure due to a lack of insurance. Other issues include rising healthcare costs and care fragmentation.
Cost Containment
Payment for healthcare services has historically promoted adoption of costly and often unnecessary or inefficient...
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Purpose of Health Records II01:19

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The vital purpose of health records is to provide a complete and accurate account of a patient's medical history, including communication, diagnostic and therapeutic orders, care planning, research, and quality review.
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Social Proof00:52

Social Proof

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Social proof is a form of persuasion based on comparison and conformity. People compare their behavior and actions to what others are doing and will change to conform to do what their peers do.
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Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different...
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Updated: Oct 29, 2025

Large-Scale SARS-CoV-2 Testing Utilizing Saliva and Transposition Sample Pooling
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NovidChain: Blockchain-based privacy-preserving platform for COVID-19 test/vaccine certificates.

Amal Abid1, Saoussen Cheikhrouhou1,2, Slim Kallel1,2

  • 1ReDCAD, National Engineering School of Sfax University of Sfax Sfax Tunisia.

Software: Practice & Experience
|July 6, 2021
PubMed
Summary

NovidChain offers a secure, blockchain-based solution for digital health certificates, enhancing privacy and data integrity for COVID-19 test and vaccine verification. This platform ensures user control and GDPR compliance, improving upon existing systems.

Keywords:
BlockchainCOVID‐19 pandemicGDPRKYCW3C verifiable credentialsdigital health certificateprivacy self‐sovereignty

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Area of Science:

  • Digital Health
  • Blockchain Technology
  • Cybersecurity

Background:

  • The COVID-19 pandemic highlighted limitations in healthcare systems for managing public health emergencies.
  • There is an urgent need for secure technologies to facilitate economic recovery and a return to normal life.
  • Digital health certificates are crucial for verifying COVID-19 status for travel, work, and public safety.

Purpose of the Study:

  • To introduce NovidChain, a novel blockchain-based platform for secure and privacy-preserving digital health certificates.
  • To demonstrate how NovidChain can be used for issuing and verifying COVID-19 test and vaccine certificates.
  • To evaluate the security, efficiency, and scalability of the NovidChain platform.

Main Methods:

  • Utilizing blockchain technology for data integrity and immutability.
  • Implementing self-sovereign identity for user data control.
  • Employing encryption for Personally Identifiable Information (PII) and W3C verifiable credentials standard.
  • Incorporating selective disclosure for privacy-preserving information sharing.
  • Conducting a proof-of-concept implementation, experiments, and comparative evaluation.

Main Results:

  • NovidChain ensures data integrity, immutability, and security properties including binding, uniqueness, and revocation.
  • The platform offers enhanced privacy through encryption and selective disclosure, complying with GDPR and KYC requirements.
  • Experimental evaluation shows NovidChain provides superior financial cost and scalability compared to other solutions, with significant time improvements (46-56%) in operations.

Conclusions:

  • NovidChain presents a robust and efficient solution for digital health certificates, balancing public safety with individual privacy rights.
  • The platform empowers users with self-sovereign identity, ensuring control over their personal health data.
  • NovidChain's technical merits and performance advantages make it a promising technology for managing health credentials in a post-pandemic world.