Transaction hash of block 71036

I recently downloaded the blockchain and I started having fun reading the binary files. However, I can't get some of the transactions hash present on block 71036, more specifically those transactions that contains a bunch of OP_CHECKSIG.
On those cases, how the transaction hash was obtained?

Edit: you can look at block 71036 here.

submitted by /u/Aerith_Gainsborough_
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