Blockchain uses Public-key Cryptography (asymmetric key algorithms) to protect transaction messages across the network. In Blockchain, digital signatures based upon public-key cryptography are used to prove that a message originates from a specific person and no one else.
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There are two fundamental cryptographic concepts holding the Blockchain together. Digital Signature and Hashing ensure that the transactions on a Blockchain are only carried out by legitimate persons, and that the records remain free from manipulation.
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This is a discussion of Blockchain, the underlying technology of Bitcoin cryptocurrency, with examples of how it can be used in other fields.
There are two main cryptographic concepts that form the basis of a Blockchain network. The first is hashing, and the second is digital signatures. A Digital signature proves the identity of a sender with the private key that claims ownership of assets described in a transaction.