BelkaCTF #6: Bogus Bill

BelkaCTF #6 is over, the gang of money forgers is all caught. Thank you for being a part of this! Congratulations to the winners:
Student track: its5Q, belkakaka, kiwi
Professional track: sinsa, sm233, teo4n6

📄 BelkaCTF #6: Bogus Bill write-up

—Chief... I think I stumbled upon something interesting.

—Don't keep me waiting, huh? What's going on?

—Take a look here! These guys were definitely chatting about something fishy.

—Hm… Who was our buddy chatting with about this shady business?

Warmup
100
Conspirators
Solved 172 times

Which Telegram accounts did the owner discuss shady stuff with?
Format: @username, @username, @username, ...

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