<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>

CC BY-SA 4.0
2018-06-16T04:12:41.043Z
That is fantastic. Nothing about the diagram told me for sure what's going on and I needed confirmation. At one point in my learning I thought that it was transaction #1 that was being signed and that transaction #1's signature was stored in transaction #2. I am glad you set me straight (once again). Thank you.
Jazimov
CC BY-SA 4.0
2018-06-16T02:02:29.577Z
2018-06-16T02:02:29.577Z
2020-06-16T11:10:03.350Z
Ava Chow
<p>In Satoshi Nakamoto's diagram: </p>

<p><a href="https://i.sstatic.net/HUZQ2.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/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>

<transactions>
Transaction Hash Chain Signature: What Is Getting Signed?
Jazimov
# Transaction Hash Chain Signature: What Is Getting Signed?

(Asked by: username_0 on 2018-06-16)

In Satoshi Nakamoto's diagram:

[![enter image description here](https://i.sstatic.net/HUZQ2.jpg)](https://i.sstatic.net/HUZQ2.jpg)

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.

**Tags:** transactions


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## 1 answers

### Answer by username_1 on 2018-06-16. Score: 3 | Accepted answer

> 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.

> **Comments:**
> **username_0**: That is fantastic. Nothing about the diagram told me for sure what's going on and I needed confirmation. At one point in my learning I thought that it was transaction #1 that was being signed and that transaction #1's signature was stored in transaction #2. I am glad you set me straight (once again). Thank you.  

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