I get it that the "OP_CHECKSIG" does this, but I can't see how to recreate it. I tried SHA1 and SHA256 of some of the info in a given bitcoin transaction but it didn't give me confirmed values of Z. Can someone please select a transaction, tell me which one it is and show me what I need to cut and paste into a SHA1 calculator to get the actual Z value?
The hash value of TX 9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1 is supposed to be z = c0e2d0a89a348de88fda08211c70d1d7e52ccef2eb9459911bf977d587784c6e and also z = 17b0f41c8c337ac1e18c98759e83a8cccbc368dd9d89e5f03cb633c265fd0ddc but I do not see how the z values are achieved.