Cryptocurrencies are a form of virtual or digital currency that is secured using cryptography. This means that they are incredibly secure and are near impossible to counterfeit or double-spend.
Various encryption algorithms and other cryptographic techniques are usually involved in any cryptocurrency you care to look at that serve the purpose of safeguarding the networks from outside manipulation. Which cryptographic methods are used does vary, but can include things like curve encryption, public-private key pairs, and hashing functions.
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