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Definition: peer-to-peer protocol

The high-level protocol used in a peer-to-peer network. Peer-to-peer protocols are typically application-level protocols (see OSI model). Gnutella and Kazaa are examples of peer-to-peer file sharing protocols. SIP and Skype are examples of voice over IP (VoIP) protocols. In the crypto world, the blockchain protocol is a peer-to-peer protocol that includes other functionality (see consensus mechanism). See peer-to-peer network, SIP and Skype.