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P2PEP (Pay-to-pay end point) is a relatively new privacy feature in Bitcoin,
The result is a CoinJoin transaction which breaks the common-input-ownership heuristic and improves privacy, but is also undetectable and indistinguishable from any regular bitcoin transaction.
Source & More: https://en.bitcoin.it/wiki/PayJoin
Other ways of protecting your Bitcoin privacy are for example Incognito Chain or Liquid Network
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