who is building the telegram equivalent of nostr? nostr:npub1sg6plzptd64u62a878hep2kev88swjh3tw00gjsfl8f237lmu63q0uf63m nostr:note1j6d8t9aegfkwg0fqswuzhxjm30t2yntdlg5ktncdcr4etmwwgwqsylw6v0