# Efficient Resource Allocation in Blockchain-Assisted Health Care Systems
## 2 Related Work  
Blockchain technology, due to its wide acceptability in diverse applications, is an intensive research area. In [24], the authors proposed a consortium blockchain to share data securely in a scalable network. In that work, the authors used a digital signature-based smart contract technique for data security. The results highlighted that the proposed solution resulted in an increase of 83.33% with a sixfold reduction in data blocks.  
An area-based message transfer solution suited for blockchain-enabled vehicular networks was proposed in [25; 26]. In [25], the authors proposed using a blockchain to increase trustworthiness and for secure delivery of vehicle data to neighboring vehicles. The work divided the area into regions and used the regional blockchain concept. The authors in [26] addressed trust management in transferring data among vehicles in vehicular ad hoc networks by discarding low-value messages from the network after considering a threshold value. The authors proposed blockchains for revocation, trust, and certificatation, and message blockchains under government-administered blockchains. The authors claimed an efficient message transmission, having a low delay time in the presence or absence of malicious attacks.  
Regarding smart health care, an identity-based authentication system was proposed in [27]. This is useful for the registration process in hospitals and has the benefits of being distributed and secure. The authors used blockchain technology for the secure and speedy transfer of data to the referred medical center. In [28], the authors addressed security concerns about patients' information using blockchain technology and smart contracts. In their work, intelligent records of patient health, with immutable and authentic accessibility and a secure and prompt payment method, were proposed.  
In [29; 30], blockchain-based solutions were proposed by addressing different problems faced in patient-centric healthcare systems. In [29], the data privacy of patients was addressed, and the proposed blockchain-based uncheckable and secured distributed ledger technology was used to maintain the privacy of patients' data. In [30], the work was related to the internet challenges of cloud computing and blockchain technologies in healthcare systems and presented a one-to-one care structure system with real-time remote healthcare.  
The importance of healthcare increases with age. An IoT and blockchain-based healthcare system was proposed to address aging population problems [31]. In that research, the authors emphasized the increasing cost of the care of elderly patients. The authors presented a solution for smart-health management of older patients. In [32], the authors highlighted the problems faced in IoT-based healthcare, related to security and functional parameters. The authors addressed these problems by proposing a systematic identity and access management (IAM) system that was based on blockchain technology.  
Most research has proposed blockchain technology in the healthcare system, to address the security and confidentiality of patients' data from different perspectives. The nonce computing in blockchain technologies is an essential part and takes a long time, which may not be feasible for transferring the health care data of critical condition patients. This work presents a priority-based nonce computing load technique for allocation to the fog nodes that significantly benefits critical patients' data.