Most of our data will be kept off-chain. We only have very limited use for existing blockchains, including the currently biggest one, Bitcoin. This is mainly due to the inherent limitations of the centralized nature of a single blockchain. Decentralized as its nodes are, there is only one blockchain and thus a potential single point of failure. This single blockchain needs to reach universal consensus about all transactions at all times. This also turns it into a matter of scalability. Since its inception in 2009, the Bitcoin blockchain has recorded about 250 million transactions. This is dwarfed by the need to store, update, and retrieve billions of records. The Healid approach uses a more genuinely distributed approach, although certain aspects of currently existing blockchains will be leveraged.
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