Subject: Re: [bitcoindev] Against Allowing Quantum Recovery of Bitcoin

From: Sjors Provoost <[email-masked]>
Date: Wed, 28 May 2025 09:46:40 +0200

> Op 28 mei 2025, om 03:07 heeft waxwing/ AdamISZ <[email-masked]> het volgende geschreven:
> 
> Hi all,
> 
> I'd like to point out that the worst case scenarios here might be even worse than one naturally thinks.

Good morning! :-)

> Two more observations:
> 
> (3) I do really like the "disabled NUMS" concept in regard to taproot external keys, for paving the way to PQC in tapleaf. This is one kind of censorship that cannot be controversial.

I brought this up [0], but it was later pointed out to me that it doesn't work.

The scriptPubKey that you see on chain is not the NUMS point itself. The internal key is a NUMS point, but it's tweaked. When this tweaked key is spent, the tweak itself is not revealed, so the blockchain can't tell if a NUMS was involved, and can't block the spend.

- Sjors

https://groups.google.com/g/bitcoindev/c/uUK6py0Yjq0/m/bQk2v0E5BQAJ

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