The simplest way to break the sole privacy problem Satoshi left in the whitepaper 🫱 nostr:note1zyqqdvrreedrkgmrk8tw0wm4lsjy04wwznms9gq73ums53c7sqjqccf0yu

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Discussion

How much of a downgrade do you think this is compared to coinjoin?

Neither up- nor downgrade, just another flavor. Payjoin keeps details of an actual payment private from third parties. Old school equal-amount CoinJoin (including Wasabi 2) keeps earlier history private from a second party, but payments thereafter leak details.

Payjoin is an incremental change to boost the privacy of the whole network, not just for an individual.

Was Payjoin a BIP? Is it merged into core? I’ve been hearing about it but don’t know what it is.

BIP 78 is Payjoin v1

BIP 77 is Payjoin V2 (an open draft PR)