some new things coming with top edge upgradea) Better crypto (replaced SHA1/DH/RSA1024 with SHA3/ed25519/curve25519)b) Improved directory protocol, leaking much less information to directory servers.c) Improved directory protocol, with smaller surface for targeted attacks.d) Better onion address security against impersonation.e) More extensible introduction/rendezvous protocol.f) A cleaner and more modular codebase.You can identify a next-generation onion address by its length: they are 56 characters long, as in ".onion".