user73139: In Satoshi Nakamoto's diagram: 

I understand this diagram is dated--but please bear with me. I think I have missed a critical point of the diagram:
Question:
Let's assume that the three transactions depicted are #1, #2, and #3 from left to right. 
Is the Signature for Transaction #2 computed using Owner 1's Private Key and the Transaction data for Transaction #1 or is it computed using Owner 1's Private Key and the Transaction data for Transaction #2? 
Thank you.

user48884: 
Question: Let's assume that the three transactions depicted are #1, #2, and #3 from left to right.
Is the Signature for Transaction #2 computed using Owner 1's Private Key and the Transaction data for Transaction #1 or is it computed using Owner 1's Private Key and the Transaction data for Transaction #2?

The Signature for Transaction #2 is computed using Owner 1's Private Key and the Transaction data for Transaction #2.

73139: <p>In Satoshi Nakamoto's diagram: </p>

<p><a href="https://i.stack.imgur.com/HUZQ2.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HUZQ2.jpg" alt="enter image description here"></a></p>

<p>I understand this diagram is dated--but please bear with me. I think I have missed a critical point of the diagram:</p>

<p>Question:
Let's assume that the three transactions depicted are #1, #2, and #3 from left to right. </p>

<p>Is the Signature for Transaction #2 computed using Owner 1's Private Key and the Transaction data for Transaction #1 or is it computed using Owner 1's Private Key and the Transaction data for Transaction #2? </p>

<p>Thank you.</p>
 48884: <blockquote>
<p>Question: Let's assume that the three transactions depicted are #1, #2, and #3 from left to right.</p>
<p>Is the Signature for Transaction #2 computed using Owner 1's Private Key and the Transaction data for Transaction #1 or is it computed using Owner 1's Private Key and the Transaction data for Transaction #2?</p>
</blockquote>
<p>The Signature for Transaction #2 is computed using Owner 1's Private Key and the Transaction data for Transaction #2.</p>
