In a bitcoin multi-sig wallet, can i determine which of the m of n keys were used to send bitcoin?

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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?

Aaron Perlmutter

Posted 2018-04-08T13:31:13.190

Reputation: 1

Answers

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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.

Abdussamad

Posted 2018-04-08T13:31:13.190

Reputation: 1 850

So then I would need to know which individuals hold which public keys from the beginning, when the wallet is created? – Aaron Perlmutter – 2018-04-08T14:13:54.767

Yes, that's correct – Raghav Sood – 2018-04-08T14:19:05.587

1This 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 – 2018-04-08T16:20:52.927

Asked: 2018-04-08T13:31:13.190

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Active: 2018-04-08T14:16:08.607