What exactly is signed in "prev_out"?

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  1. What is signed by scriptSig? I use my private key to sign data from the unspent transaction? I sign the "prev_out" object?
  2. I read that the signature in "prev_out" is there to secure "prev_out" from being changed. But if the whole transaction is signed, doesn’t that secure also the "prev_out" objects?



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