Here is the list of Telegram Media about "Official".
Type: Bot Setup and Manage Telegram MTProxy servers.
Type: Bot ContestBot is a way for Telegram to hold online competitions and find new members for the Telegram team.
Type: Bot Claim an occupied username for your Telegram account, public group or channel.
Type: Bot Verified account of Stripe. Use this bot to receive payments from Telegram users to your Stripe account.
Type: Bot This bot accept UI layouts and animations intended to improve Telegram. Best contributions are published in @designers.
Type: Bot This bot lists career opportunities at Telegram and accepts candidates applications. Available at telegram.org/jobs
Type: Bot Try out Telegram Payments and donate real money to the Telegram Project.
Type: Bot This bot can help you in getting a copy of your data that is stored by Telegram and then about privacy.