Want to verify previous block hash and prove of work

[Bitcoin]

Want to verify previous block hash and prove of work

I want to verify several random blocks and check if there was prove of work really found. I need it for some reasearch reasons. I have downloaded the blocks historical info and there are only hashes with number of zeroes in the block headers in the ladder I have downloded. This means the prove of work was alredy found. Is there any way to get initial block hash and the prove of work which was found, so I could calculate their hash by myself?

There is an exaple:
SHA256 hash of the current block hash = 000000000000000000044F29DB8B3388FD4E4CF400420B2AA8DA008E9891250B

How can I find what was the initial hash number and prove of work?

Thank you in advance.

Source: Want to verify previous block hash and prove of work