Blockchain technology is a distributed electronic ledger of digital records, events or transactions that are cryptographically secure, extremely hard to forge, and updateable through a consensus protocol agreeable to all connected nodes. [1] The technology uses decentralized consensus algorithms to control database consistency. The database is purely distributed in nature and is shared to all nodes connected to the network. Transactions in the databases are bundled together for specified period of time to form a block of certain number of transactions.These blocks are linked cryptographically through hash pointers to form a chain of blocks with transactions (Figure 1) [1][2][3].

PurposeWarehouse receipt system (WRS) schemes aim to revitalize the market of cash crops, particularly those of the smallholder farmers. However, the existing government schemes for the smallholder farmers have not been much successful on account of issues related with transparency and trust deficit, thereby limiting farmers' access to credit for their farming activities as channeled via the formal financial institutions. Conceding that blockchain is an emerging technology, this study aims to theoretically posit the potential to optimize WRS in real time to bolster farmers' trust and privacy.Design/methodology/approachThe research bases itself on the design science research (DSR) approach. Using the DSR approach backed by the literature review and evolutionary prototyping, a blockchain-based WRS has been advanced in the study.FindingsThis study provides a design of a digital WRS, which serves as a proof of concept of blockchain technology (BCT) applications in improving transparency in the WRS in the agricultural sector. The findings from this study present the possibility of leveraging blockchain smart contracts to improve the linkages between the WRS stakeholders to promote trust and transparency that would eventually unlock the potentials of WRS schemes. Furthermore, the findings inform decision-makers and practitioners to prioritize the emerging technologies in revamping the classical WRS.Research limitations/implicationsThe study leaves research pointers for implementing BCT in agricultural supply chain and furthering the findings from the present study with an empirical agenda.Originality/valueWhilst research on the BCT applications across myriad sectors abounds, research on the BCT applications to address societal needs is conspicuously limited. Furthermore, research on the practical implementation of the BCT in real-world scenarios is few and far between. The present study seeks to plug these gaps by underlining the application and utility of blockchain in WRS. The study makes a significant contribution to the theory and practice of the agrarian supply chain management, specifically the WRS, by invoking design knowledge obtained through an iterative design process besides serving as an edifice for the integration of emerging technologies, notably BCT in the agricultural sector.

Systems in the health sector are very crucial for human life and they should be efficient, reliable and secure. Unfortunately, electronic health record (EHR) systems do not work effectively when managing multi-institutional medical records. The EHR, which is a digital system in which patient health information is systematically stored. The information stored includes medical history, laboratory test results, demographics, and billing information, poses problems to patients related to interoperability, privacy, and data integrity. Most solutions to these threats focus on a centralized architecture that faces a single point of failure and internal threats, such as unreliable system administrators. The promising solution that many researchers are interested in is the use of blockchains. However, in developing countries, and particularly in sub-Saharan Africa, very little attention has been given to the issues of interoperability, privacy and data integrity for EHRs using blockchain technology. As such, this research has designed and developed self-sovereign identity management and secure information sharing system for health systems in developing countries, based on blockchain technology, which helps to solve the mentioned problems. The study used a Design Science Research (DSR) methodology to develop solutions to the research problem through three sub studies. The first and the second sub studies conducted under problem awareness and suggestion phases of DSR, and third sub study conducted under development and evaluation phases of DSR. The first sub study deal with the assessment of three most common blockchain based healthcare systems (MedicalChain, Patientory, and MediLedger). The second sub study studies the problem of existing EHR systems in Tanzania regarding privacy issues in identity management and secure sharing of medical data from one healthcare facility to the other. The third sub study deal with the development of two systems, one for identity management using blockchain (self-sovereign identity), and one for secure sharing of medical data from one healthcare facility to another through blockchain technology. The systems provide additional privacy protection tools to the existing infrastructures. They reduce development cost, transparency, data integrity, protection against single-point-offailure vulnerabilities, and prevention of internal threats such as untrusted system administrators. The systems will make the existing and future health information systems trustable to healthcare service providers and the end-users of the healthcare systems. Also, will help the stakeholders in the healthcare sector to properly manage the healthcare systems.