# A Review of Blockchain Technology Applications in Ambient Assisted Living
## 4 Discussion
The quantity of data to be saved on the blockchain will increase in tandem with the number of transactions on the network. It may cause problems related to the network speed and high costs. It is difficult to assess blockchain performance concerning the integration of IoT monitoring devices in living environments and the storage and dissemination of patient data for remote follow-up. Because the technology is decentralized, there is no benchmark against which to compare performance. However, there are a few methods for assessing performance. One method is to look at how many transactions a blockchain network processes in a particular amount of time. Another technique to assess performance is to look at a blockchain network's average transaction time. As scalability is a significant issue of the blockchain, managing a high number of transactions is important to gain broad acceptance in ambient assisted living systems. However, there are several solutions for improving scalability. Sharding is one potential solution in which the blockchain is split into several shards, each of which may execute transactions concurrently and can be correlated with the organization and data-sharing procedures in healthcare. It would enable the network to handle a considerably higher volume of transactions without compromising speed or efficiency. Another option is off-chain scaling, which entails shifting part of the data off-chain, and this can be a relevant option even to relieve some of the privacy concerns as the patient monitoring data will be stored at the edge. In the blockchain, there is a lot of room for privacy. This is relevant for ambient assisted living systems where private data and informed consent must be carefully handled. With blockchain, we may construct a safe and private transactional environment to share patient health records and data. Blockchain, if properly used, has the potential to eliminate fraud and improve transparency. However, ensuring privacy needs further research and development. One of the difficulties is that all parties must have a common concept of the data confidentiality, and new care and data-sharing paths need to be created in the healthcare systems. The creation of a digital identity is another way that blockchain may aid in the enforcement of privacy. This would allow us to choose which personal information is shared and with whom. In an ambient assisted living system, we may, for example, select to share the data partially with our family and not at all with our insurance company. A digital identity would offer us complete control over our personal information, allowing us to guarantee that it is shared only with the people we choose. Another issue of ambient assisted living systems is the possibility of data leaks and modification. Unauthorized parties may have access to monitoring data if they is not protected adequately. Therefore, data may be encrypted using blockchain. This makes it extremely difficult for anyone who is not allowed to read it and modify it. A decentralized network is what defines a blockchain. It implies that our data are not stored in a single area, making it extremely difficult to be modified. Smart contracts can be created using blockchain technology. Integrated into ambient assisted living systems, they may automatize the IoT devices integration as well as the data processing jobs. As a result, we may designate how and by whom our data can be utilized. If someone tries to use our data in a way we have not approved, the smart contract will prohibit them immediately. The data stay private and safe by utilizing blockchain to encrypt data, build a decentralized network, and construct smart contracts. Finally, the ability of various systems to communicate and interoperate is important for care and support systems that need to integrate stakeholders across the whole continuum of care. The capacity to exchange currency and data between various blockchain networks is one of the advantages of blockchain interoperability.