Cryptocurrencies utilize blockchain technology to facilitate secure, decentralized transactions. The blockchain serves as a public ledger, recording all transactions in linked blocks that are inherently tamper-resistant. This decentralized nature enhances transparency, allowing users to verify transactions without the need for intermediaries. Furthermore, the cryptographic principles underlying blockchains ensure that transactions are secure and participants' identities are protected. This technology enables a range of applications, from digital currencies to smart contracts, transforming various industries by reducing reliance on traditional financial systems.