# BloodChain: A Blood Donation Network Managed by Blockchain Technologies
###### Abstract  
Due to the rapid change of population structure, leading to lower birth rates and quick aging rates, the demand for blood supply is increasing significantly. In most countries, blood quality and origin are managed by blood management information systems, such as national authorities. Nevertheless, the traditional system has limitations in this field, such as a lack of detailed blood information, making it challenging to manage blood quality, supply, and demand. Hence, to solve these issues, this paper proposes a blockchain-based system called BloodChain, an improved system to support blood information management, providing more detailed information about blood, such as blood consumption and disposal. BloodChain exploits private blockchain techniques with a limited number of relatively fast and reliable participants, making them suitable for B2B (Business to Business) transactions. In this paper, we also develop a proposed system based on the architecture of Hyperledger Fabric. The evaluation of BloodChain is performed in several scenarios to prove our proposed model's effectiveness. blood donation network; blockchain; Hyperledger Fabric; blood quality; information visibility 2022221010 January 202210 January 20222221010 January 202  
for managing health problems had defined a blood clot management system. The blood temperature and storage conditions must be accurate. Blood is donated until distribution to the patient [16]. The WHO report also guides the location of blood donations, storage, and distribution of blood. However, no documents show the ability to trace the origin and quality of blood. In Korea, the Blood Service Headquarters of the Korean Red Cross, which has fifteen blood banks and three blood tests, was established in 1958 [17]. The system is operated only to collect, store, and distribute blood and check the blood's quality and origin. The information of blood donors, blood types, and blood quality is sensitive, and it requires transparency and good confidentiality. In addition, the process from blood donation to blood transfusion to the patient goes through many stages, such as storage and transportation; hence, the ability to store transaction information quickly is needed, and the information cannot be unaccountably modified. From the above requirements, blockchain technology is considered the right solution today to provide helpful information for blood ownership, hospitals, and blood recipients. The current blood management system only reports information about the amount of blood taken and lacks information about the patient's needs [18]. Therefore, this paper proposed a blockchain-based blood supply chain system called BloodChain. This system designs and provides an essential understanding to the reader of how the process works. In the process of blood provision with ambiguous information about blood origin and quality, complex storage, and transportation conditions, blockchain technology can create traceability.The patients can access the system and view necessary information on this platform without any privacy violation. Blockchain implements the transparency and privacy of each stakeholder along the blood donation supply chain. Blockchain technology promises to address essential aspects of the healthcare industry that have not been studied before, representing the transition from trusting people to trusting mathematics, playing a critical role in developing the blood donation system. Using a blockchain-based healthcare system, stakeholders receive beneficiaries to improve their health and stabilize blood supply and demand even in unusual situations.