You need to show us a proof that you are part of the bartertrade by including the official email coming from bartertrade with your name on it like owner@bartertrade.io anyone can use any company for their deals but proving it is another, I don't trust telegram when it comes with dealing like this, it should be on the official email or chat board of a company.
You really shouldn't worry about that. You will not be dealing with me through telegram or anything. everything will be official if you decide to take part in the company. Telegram or any chat medium is just to discuss if we can come to an agreement. Everything will be fully transparent. Meetings will be held in person and everything will be documented according to laws.