<p>The signatures and public keys have to be supplied to spend the coins so yes you can tell by looking at the spending transaction on the blockchain.</p>

CC BY-SA 3.0
2018-04-08T14:13:54.767Z
So then I would need to know which individuals hold which public keys from the beginning, when the wallet is created?
Aaron Perlmutter
CC BY-SA 3.0
2018-04-08T14:19:05.587Z
Yes, that's correct
Raghav Sood
CC BY-SA 3.0
2018-04-08T16:20:52.927Z
This mechanism is also only generally available to the participants in the multisig construction, if the common advice of no key reuse is followed.
Pieter Wuille
CC BY-SA 3.0
2018-04-08T14:03:51.703Z
2018-04-08T14:03:51.703Z
Abdussamad
<p>I'm particularly interested in this for large n multi-sig wallets. For example, if m-of-n is 4-of-6, and 6 different people (e.g. 6 non-profit co-directors) hold each of the n keys. If one day all of the wallet is emptied just using 4 (m) keys, will the 2 (n-m) people be able to determine which were the 4 keys and thereby the 4 co-directors that emptied the wallet?</p>

<multi-signature>
In a bitcoin multi-sig wallet, can i determine which of the m of n keys were used to send bitcoin?
Aaron Perlmutter
# In a bitcoin multi-sig wallet, can i determine which of the m of n keys were used to send bitcoin?

(Asked by: username_0 on 2018-04-08)

I'm particularly interested in this for large n multi-sig wallets. For example, if m-of-n is 4-of-6, and 6 different people (e.g. 6 non-profit co-directors) hold each of the n keys. If one day all of the wallet is emptied just using 4 (m) keys, will the 2 (n-m) people be able to determine which were the 4 keys and thereby the 4 co-directors that emptied the wallet?

**Tags:** multi-signature


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## 1 answers

### Answer by username_1 on 2018-04-08. Score: 2

The signatures and public keys have to be supplied to spend the coins so yes you can tell by looking at the spending transaction on the blockchain.

> **Comments:**
> **username_0**: So then I would need to know which individuals hold which public keys from the beginning, when the wallet is created?  
> **username_2**: Yes, that's correct  
> **username_3**: This mechanism is also only generally available to the participants in the multisig construction, if the common advice of no key reuse is followed.  

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