Were there any document signing with electronic signatures in the document workflow? How did it work?

Yes, an electronic signature was used within the document workflow to confirm the authenticity and legal validity of documents.

The process typically looked like this:

1. The document was generated in the system and sent for signature.
2. The user or responsible person signed the document using an electronic signature, which could be implemented through certificates and cryptographic keys.
3. The system verified the correctness of the signature using the public key and verification algorithms.
4. The signed document was saved with metadata about the signature (time, signer, certificate).

In practice, this could be implemented using standards such as XML-DSig or PKCS#7, and integrated with certification authorities (CAs). In Java, libraries like BouncyCastle or built-in cryptography APIs are often used for working with electronic signatures.