The best source for all Wire privacy and security related details is wire.com/privacy.
Product design decisions for secure messengers
Wire
1305

Hmm I’m not sure how I feel about this tho. Like username, profile picture, And profile name is enough as all can be anonymous. Phone number is probably not anonymous but temporary numbers can be obtained for signup. Having a list of contacts and conversations I think is pushing it way too far. Contacts perhaps but list of conversations I don’t know.