<p>Not categorically, no. I think it has pretty much always possible to apply signatures one-by-one, but it has become a lot less arduous over time to create multi-sender transactions. However, I would surmise that even today you would be right almost always to assume that all inputs are controlled by a single entity, especially if you special case obvious coinjoin transactions.</p>

CC BY-SA 4.0
2024-10-10T12:29:36.750Z
Ha great, thank you!
Archie
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2024-10-10T12:35:15.607Z
Is there a claim for the earliest multi-sender transaction? Maybe Satoshi and Hal tested it?
Archie
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2024-10-10T17:19:54.137Z
Interesting question! I don’t know of one from the top of my head, but that would make a great follow up question. Could you start a topic for that?
Murch
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2024-10-10T18:49:57.630Z
Thanks, I have done so at https://bitcoin.stackexchange.com/questions/124461/what-is-the-earliest-multi-sender-transaction
Archie
CC BY-SA 4.0
2024-10-10T11:56:37.297Z
2024-10-10T17:19:07.997Z
2024-10-10T17:19:07.997Z
Murch
<p>I am all new to bitcoin and would like to make some studies for a datascience project.</p>
<p>I'm focussing on the visualization of some chains of transactions where I could visualize users by some color scheme or pictogram.</p>
<p>I gather that in 2013 the so-called mixers started to occur which allowed different users to feature as different inputs of a transaction.</p>
<p>My question is : can I assume that before 2013 in any transaction the different inputs all belonged to a single user?</p>
<p>If not was it the case in 2010 or in 2009?</p>

<transaction-input><charts><user-data>
Before 2013, did multiples inputs necessarily belong to a single user?
Archie
# Before 2013, did multiples inputs necessarily belong to a single user?

(Asked by: username_0 on 2024-10-09)

I am all new to bitcoin and would like to make some studies for a datascience project.

I'm focussing on the visualization of some chains of transactions where I could visualize users by some color scheme or pictogram.

I gather that in 2013 the so-called mixers started to occur which allowed different users to feature as different inputs of a transaction.

My question is : can I assume that before 2013 in any transaction the different inputs all belonged to a single user?

If not was it the case in 2010 or in 2009?

**Tags:** transaction-input, charts, user-data


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## 1 answers

### Answer by username_1 on 2024-10-10. Score: 1 | Accepted answer

Not categorically, no. I think it has pretty much always possible to apply signatures one-by-one, but it has become a lot less arduous over time to create multi-sender transactions. However, I would surmise that even today you would be right almost always to assume that all inputs are controlled by a single entity, especially if you special case obvious coinjoin transactions.

> **Comments:**
> **username_0**: Ha great, thank you!  
> **username_0**: Is there a claim for the earliest multi-sender transaction? Maybe Satoshi and Hal tested it?  
> **username_1**: Interesting question! I don’t know of one from the top of my head, but that would make a great follow up question. Could you start a topic for that?  
> **username_0**: Thanks, I have done so at https://bitcoin.stackexchange.com/questions/124461/what-is-the-earliest-multi-sender-transaction  

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