Does blockchain need a cryptocurrency?

No, blockchain does not necessarily need a cryptocurrency. While cryptocurrencies like Bitcoin and Ethereum are often associated with blockchain technology, they are not the only use case for blockchain.
Blockchain technology is a decentralized, tamper-proof, and transparent ledger system that can be used to store and manage various types of data and digital assets, such as contracts, identity information, and supply chain data. Blockchain can be used in a wide range of applications, from finance and healthcare to voting and supply chain management.
Cryptocurrencies, on the other hand, use blockchain technology to create a secure and decentralized form of digital currency that can be used as a means of exchange and store of value. While cryptocurrency is a popular application of blockchain, it is not the only one.
In fact, there are many blockchain projects that do not involve cryptocurrencies at all, such as Hyperledger, Corda, and Quorum. These blockchain platforms are designed for enterprise use cases and are focused on providing a secure and efficient way to manage data and digital assets, without the need for a cryptocurrency.
So, while cryptocurrency is one use case for blockchain technology, it is not a requirement. Blockchain can be used in a variety of applications without the need for a cryptocurrency.