Send empty messages, hide your bio, and create a "Ghost Profile."
Telegram is one of the few apps that allows users to have almost complete anonymity. However, you are usually required to have at least a First Name. Using this tool, you can remove even that.
If you want to send a message that contains no text (to confuse friends or create space in a channel):
Note: This is different from Telegram's "Spoiler" feature. A spoiler hides text until clicked. This tool makes the text permanently invisible.