how to get 'z' in ECDSA?

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There are 2 nice articles about ECDSA of getting private key by the same 'r'. I dont know how to get the 'z'. Can u describe in detail and give an example?first article second article

private-key
ecdsa

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edited Mar 23, 2023 at 7:13

LEVI_104

asked Mar 23, 2023 at 7:01

LEVI_104LEVI_104

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