How to prove the authenticity of the service agreement in court / bank?

Question

Freelance

As a self-employed freelancer (or non-freelancer), how do you prove the authenticity of a service contract?
How to conclude such an agreement in an online transaction?
Need to throw off the contract to the customer and tell him to fill it in "paint'e" and sign it? I, in turn, in "paint'e" will fill out my lines of the contract and send it back to him?
Or the customer needs to print out the contract and fill it out with a pen and send it to me. I, in turn, will print it out, fill out my lines of the contract with a pen and send it back to him?
What if the customer writes "left" data?
Suppose the story is this: the bank blocked my account and requires me to prove the origin of the funds.
I print out an extract from the self-employed for 60 professional services transactions.
I print out 60 service contracts, and in all the customer's data are "left", what then?

Answer 1

Mail, ordinary paper mail. Or an electronic signature.
Your counterparties are muddy. No wonder the bank went nuts.
What to do wrote above. Well, or get a left card for such, there and accept up to 60,000 per month there will be no questions at all

Answer 2

Banks operate in accordance with 115-FZ. In Sberbank, suspicious transactions are detected and funds are blocked automatically. The only way for you to unfreeze money is to provide the bank with properly executed contracts and acts, there are no other ways.
PS In the EU and the US, there are also relevant laws and practices for blocking accounts.

Answer 3

I usually check my counterparties, plus we conclude an agreement online, I don’t care how he signs it, the main thing is that the signature and seal are his, we exchange it by e-mail, we usually prescribe it in the agreement in advance, in which case such an agreement can be notarized
Also usually we sign everything on paper and exchange mail, courier, etc.
The tower option is an electronic signature, but there are those who do not have it, then just the option
above emails. In this case, even if you suffer financially, but if the customer forged the contract or threw something else away, then there will be a chance to identify him and relieve you of responsibility for the fake

Answer 4

The contract is certified by a notary. The signature itself is certified. The notary can additionally take on the work of exchanging data with the other party.
As far as I understand the diagram. On both sides, notaries exchange EDS and give you certified documents. To not wait for physical shipment.

Answer 5

If you have an electronic document flow and the customer signs the contract with an electronic signature, he, as it were, cannot enter false data about the default.
I didn’t understand about the paint at all
. Here, either a paper contract or an electronic one with electronic signatures.
In the case of a paper one, you just need to check the details of the customer, this is a blaming practice. In both cases, he will not be able to deceive you.