When you create a new channel, the first message of the channel will be a service message indicating that the channel "CHANNEL NAME" is created at that specific time.
Official Telegram clients doesn't show the exact timestamp and the "CHANNEL NAME" which is the initial name and kept exactly same even when you changed the channel's name.
However, you can see that channel service message and the initial name with the timestamp as a service message if you are using a custom app to request channel's messages from the Telegram API, or use 3rd party clients like Telegram X (for Android) which always shows the initial name of a channel.
Even when you changed the channel name, the first channel name is always kept and accessible. I think this is not intended (because official clients only shows "channel created" without indicating the initial name) and this should be fixed server-side.
Most of the people don't even know other people can see that initial name including the timestamp by using Telegram X or a custom Telegram app, or a few lines of code using a library like Telethon to query Telegram APIs.
I tried to delete that service message with different ways:
Using Telethon library (Telegram User APIs), it came back
With Telegram X, "clear chat history [for all members]", it came back
With main official clients (macOS, Android), deleted the "channel created" message, it came back
Thanks
Steps to reproduce
Create a channel with a specific name (e.g ABC)
Change the channel name to another specific name (e.g XYZ)
Check the channel using either Telegram X or querying channel messages with a custom app (e.g using Telethon library)
You will see the initial channel name (ABC) as the "channel created" service message and you have no chance to delete it. If you try to delete it with Telegram X, it will look like it's actually deleted, but once you cleared app storage (settings > storage > erase storage), it will come back. When using API, API will not throw an error but it will not get removed.
It might be useful to keep that service message with the initial name and timestamp only for channel admins because a channel can be transferred to someone else, and that person may want to know the initial name or previous names used for that channel. Maybe it can be visible only to channel admins or channel owners, instead of keeping it public.
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