you can assume shit It was actually in the whirlpool client all along - it always used a different identity for output registration.  https://github.com/Archive-Samourai-Wallet/whirlpool-client/blob/6eefd5b854110ad5758eb2b34be775ca44d867f5/src/main/java/com/samourai/whirlpool/client/whirlpool/ServerApi.java#L73 

 It is not used in the android app because it is computationally expensive, nor in sparrow.

https://github.com/sparrowwallet/sparrow/issues/1328 

 Crickets