Thanks for replying.

Hope those two signal protocol notes can help.

nostr:note1ffgsgvkltl96wzwe6lakv2ntjfkq2u48msx57mrvnnhtyde5s2js8antlr

nostr:note1afkmm89qpje2dzyrfclq80np7enas2l3s2g4pl5suezstfxt9thqwcg3wc