In my country, this house is a very small house in a normal place.

To be clear: how much did you pay him?

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I gave him the money through the bank.

Doesn't such an amount set off all kinds of alarm bells at the bank?

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He took the money to the dark web space. There he gave the money to an exchange office.

How exactly did he do this? The dark web is not a place where people use their own bank accounts, they use money mules.

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The exchange has transferred bitcoins to him on his user. A kind of payment gateway. My friend himself does not know how to transfer them.

Why do you ask someone who doesn't know what he's doing to buy Bitcoin for you? And why did you trust him to do this?

He has a contract with an exchange that includes privacy and he can not give me information.

You got scammed. Go to the police. Both of you have a lot of explaining to do.