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](https://mempool.space/block/00000000000997F9FD2FE1EE376293EF8C42AD09193A5D2086DDDF8E5C426B56).
Block 71036 contained several transactions with a ton of OP_CHECKSIG commands. There should only ever be one such command. This caused every node to do extra unnecessary work, and it could have been used as a denial-of-service attack. A new version of Bitcoin was quickly released. The new version did not cause a fork on the main network, though it did cause one on the test network (where someone had played around with the attack more).
https://en.bitcoin.it/wiki/Incidents#OP_CHECKSIG_abuse