In the certificate, "I hereby certify" should start a new paragraph at the end, with no punctuation after the two spaces.

Model essay of the certification letter:

Zhengzhou xx Bureau:

Comrade xxx of our bureau, male, 24 years old, 1997 graduated from the Department of Electronics of xx University. He hasn't finished the formalities because his diploma is lost.

Hereby certify that

Personnel Department of Zhengzhou xx Bureau (Seal)

A letter of proof is a special letter in the name of an administrative organ, a social organization, an enterprise, a public institution or an individual to prove someone's identity, experience or the true situation of something with conclusive evidence.

Certificate letter format:

1. Title: "Proof" or "Proof about XX problem".

2. Title: Write the name of the company on a new line, followed by a colon.

3. Text: Confirmed facts.

4. The ending is generally written as "This is for proof".

5. Issue the signature, date and official seal of the certifying unit.