Payjoin is a Bitcoin transaction protocol introduced in 2019 via BIP 78 that enhances privacy by allowing both the sender and receiver to contribute inputs, disrupting traditional blockchain analysis techniques.

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Payjoin was first proposed by Nicolas Dorier in 2019 in Bitcoin improvement proposal (BIP) 78. The core principle behind the system is that both senders and receivers may contribute inputs to a transaction.

Payjoin, first introduced in 2019 by Nicolas Dorier in BIP 78, allows both the sender and receiver to contribute inputs to a single Bitcoin transaction.