Implementing Telegram's "Seen" Feature

I think this'd be neat.

So Telegram has a two-checkmark system.

The way it works is your message will get one checkmark if it successfully sends.

The second checkmark will appear next to it soon after, and the second checkmark means that the recipient has actually seen your message.

Would be especially useful for Discord, even for when you have friends that are constantly on and off Discord so you know if they're getting your messages without spamming them.