How to prove the origin of funds in court / bank?

Question

Freelance

The bank has blocked my account and requires me to prove the origin of the funds.
I am a self-employed freelancer.
I made 60 orders to individuals in the Russian Federation (I don’t know where the individual comes from).
The amount of income was from 600 tr.
The self-employed limit of 2.4kk has not been exhausted.
Customers incognito.
They gave the data not their own, but from the Internet (I just found out).
I took data from customers, because I wanted to fill out a service agreement. As it turned out, such contracts are concluded in paper form or with the help of EDS, therefore the contracts are "in flight".
Money was transferred from QIWI to me on QIWI. I transferred from my wallet to the account of a self-employed person, from a self-employed person to Sberbank.
QIWI accounts of customers were bought or do not belong to them (only now doper)
I am a law-abiding citizen, I work, I pay taxes. I don’t do any shady and dark mud, nothing illegal either.
The work that he did (provided) to customers is absolutely normal, white, clean.
Why customers are so muddy - I do not know.
For the first time I encounter this, both with "such" customers, work and blocking.

I worked 20 hours a day for a whole month and at the moment I haven’t slept for a day yet, I’m not very sharp, I can still be stupid.

Answer 1

Dude, before going to the bank, visit a smart lawyer. And have not the bank employees asked to transfer money to a "safe" place, maybe they are just bred.

Answer 2

You have already been answered. Provide any evidence. Correspondence, screenshots, contacts. Anything.
The court must accept any evidence. Even the most ridiculous ones.

Answer 3

Customers - incognito, wallets - murky, the essence of the work - also a similar degree of turbidity? Is there anything that confirms that this is not a payment for bookmarks? If not, then you should be glad that only the funds were blocked and not the Federal Drug Control Service knocking on the door.