how to do sha256(sha256(modified transaction)) and find z1 and z2 value

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hi I tried to get z1 and z2 value but I cant understand. can any one help me with example for finding z1 and z2. or alternate website for 2coin.org
example: see this trans.
Two identical R value finding z value from two transaction

they say that do sha256 i tried that but i cant find the z1 value as they give.

can some buddy help me to find it.



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