This is basically the same concept as this proposal that describes a 
mechanism to do so (which I started a thread about 
yesterday): https://github.com/csuwildcat/pqc-precommitment-migration. Only 
difference is that you'd just activate the precommitted PQC key/validation 
pathways instead of having to explicitly freeze ECC (though I suppose you 
could do both).

On Monday, April 6, 2026 at 3:32:30 PM UTC-5 PYM wrote:

> Hello, here's a small idea to combine merkel tree with timestamped message 
> signature to bind p2pkh adress to quantum resistant scheme so user do not 
> need to rush to move bitcoin before qday, in a space efficient form.
>
>
>    - *Universal P2PKH freeze* — At a defined block height, all P2PKH 
>    outputs become unspendable via classical ECDSA. 
>    - *Pre-freeze claim* — Before the freeze, owners sign a claim 
>    containing their Bitcoin address and a new post-quantum public key of their 
>    choice. The claim is ECDSA-signed, proving classical ownership while 
>    quantum computers don't yet exist. 
>    - *Merkle-batched publication* — Claims are batched into Merkle trees. 
>    Only the 32-byte root goes on-chain via OP_RETURN. One transaction covers 
>    large amount of claims. 
>    - *Post-freeze spending* — To spend a frozen output, provide: the 
>    original claim, a Merkle inclusion proof linking it to a pre-freeze root, 
>    and a signature from the post-quantum key committed in the claim.  
>    - *No claim, no spend* — Any P2PKH output with no registered claim 
>    before the freeze height is permanently frozen until a future recovery 
>    mechanism is defined by the community.
>
>
> I do not have enough knowledge to find the ideal scheme or implementation 
> that fulfill those requirements sadly. 
>
> 1 - Stewart I, Ilie D, Zamyatin A, Werner S, Torshizi MF, Knottenbelt WJ. 
> Committing to quantum resistance: a slow defence for Bitcoin against a fast 
> quantum computing attack. R Soc Open Sci. 2018 Jun 20;5(6):180410. doi: 
> 10.1098/rsos.180410. PMID: 30110420; PMCID: PMC6030263.
> https://pmc.ncbi.nlm.nih.gov/articles/PMC6030263/

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