@interface IMChatIdentifierUtilities : NSObject + (id)_handleBasedPersonCentricIDWithParticipantIDs:(id)a0 chatStyle:(unsigned char)a1; + (id)_randomUnverifiedChatIdentifierForGroupChat; + (id)generateUnusedChatIdentifierForGroupChatWithServiceName:(id)a0 chatWithChatIdentifierExists:(id /* block */)a1; + (id)personCentricIDForChatWithGUID:(id)a0 chatIdentifier:(id)a1 chatStyle:(unsigned char)a2 groupID:(id)a3 displayName:(id)a4 lastKnownToBeHybrid:(BOOL)a5 mergeDisplayNames:(BOOL)a6 participantIDs:(id)a7; @end