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From: Agustin Cruz <agustin.cruz@gmail.com>
Date: Tue, 11 Feb 2025 21:37:37 -0300
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Subject: Re: [bitcoindev] Proposal for Quantum-Resistant Address Migration
 Protocol (QRAMP) BIP
To: Dustin Ray <dustinvonsandwich@gmail.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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Hi Dustin

To clarify, the intent behind making legacy funds unspendable after a
certain block height is indeed a hard security measure=E2=80=94designed to =
mitigate
the potentially catastrophic risk posed by quantum attacks on ECDSA. The
idea is to force a proactive migration of funds to quantum-resistant
addresses before quantum computers become capable of compromising the
current cryptography.

The migration window is intended to be sufficiently long (determined by
both block height and community input) to provide ample time for users and
service providers to transition.

El mar, 11 de feb de 2025, 9:15=E2=80=AFp. m., Dustin Ray <
dustinvonsandwich@gmail.com> escribi=C3=B3:

> Right off the bat I notice you are proposing that legacy funds become
> unspendable after a certain block height which immediately raises serious
> problems. A migration to quantum hard addresses in this manner would caus=
e
> serious financial damage to anyone holding legacy funds, if I understand
> your proposal correctly.
>
> On Tue, Feb 11, 2025 at 4:10=E2=80=AFPM Agustin Cruz <agustin.cruz@gmail.=
com>
> wrote:
>
>> Dear Bitcoin Developers,
>>
>> I am writing to share my proposal for a new Bitcoin Improvement Proposal
>> (BIP) titled *Quantum-Resistant Address Migration Protocol (QRAMP)*. The
>> goal of this proposal is to safeguard Bitcoin against potential future
>> quantum attacks by enforcing a mandatory migration period for funds held=
 in
>> legacy Bitcoin addresses (secured by ECDSA) to quantum-resistant address=
es.
>>
>> The proposal outlines:
>>
>>    - *Reducing Vulnerabilities:* Transitioning funds to
>>    quantum-resistant schemes preemptively to eliminate the risk posed by
>>    quantum attacks on exposed public keys.
>>    - *Enforcing Timelines:* A hard migration deadline that forces timely
>>    action, rather than relying on a gradual, voluntary migration that mi=
ght
>>    leave many users at risk.
>>    - *Balancing Risks:* Weighing the non-trivial risk of funds being
>>    permanently locked against the potential catastrophic impact of a qua=
ntum
>>    attack on Bitcoin=E2=80=99s security.
>>
>> Additionally, the proposal addresses common criticisms such as the risk
>> of permanent fund loss, uncertain quantum timelines, and the potential f=
or
>> chain splits. It also details backwards compatibility measures,
>> comprehensive security considerations, an extensive suite of test cases,
>> and a reference implementation plan that includes script interpreter
>> changes, wallet software updates, and network monitoring tools.
>>
>> For your convenience, I have published the full proposal on my GitHub
>> repository. You can review it at the following link:
>>
>> Quantum-Resistant Address Migration Protocol (QRAMP) Proposal on GitHub
>> <https://github.com/chucrut/bips/blob/master/bip-xxxxx.md>
>>
>> I welcome your feedback and suggestions and look forward to engaging in =
a
>> constructive discussion on how best to enhance the security and resilien=
ce
>> of the Bitcoin network in the quantum computing era.
>>
>> Thank you for your time and consideration.
>>
>> Best regards,
>>
>> Agustin Cruz
>>
>> --
>> You received this message because you are subscribed to the Google Group=
s
>> "Bitcoin Development Mailing List" group.
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>> email to bitcoindev+unsubscribe@googlegroups.com.
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bde8598e7n%40googlegroups.com
>> <https://groups.google.com/d/msgid/bitcoindev/08a544fa-a29b-45c2-8303-8c=
5bde8598e7n%40googlegroups.com?utm_medium=3Demail&utm_source=3Dfooter>
>> .
>>
>

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<div dir=3D"auto"><p dir=3D"ltr">Hi Dustin</p><p dir=3D"ltr">To clarify, th=
e intent behind making legacy funds unspendable after a certain block heigh=
t is indeed a hard security measure=E2=80=94designed to mitigate the potent=
ially catastrophic risk posed by quantum attacks on ECDSA. The idea is to f=
orce a proactive migration of funds to quantum-resistant addresses before q=
uantum computers become capable of compromising the current cryptography.</=
p>
<p dir=3D"ltr">The migration window is intended to be sufficiently long (de=
termined by both block height and community input) to provide ample time fo=
r users and service providers to transition.</p></div><br><div class=3D"gma=
il_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">El ma=
r, 11 de feb de 2025, 9:15=E2=80=AFp.=C2=A0m., Dustin Ray &lt;<a href=3D"ma=
ilto:dustinvonsandwich@gmail.com">dustinvonsandwich@gmail.com</a>&gt; escri=
bi=C3=B3:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto">Right o=
ff the bat I notice you are proposing that legacy funds become unspendable =
after a certain block height which immediately raises serious problems. A m=
igration to quantum hard addresses in this manner would cause serious finan=
cial damage to anyone holding legacy funds, if I understand your proposal c=
orrectly.</div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, Feb 11, 2025 at 4:10=E2=80=AFPM Agustin Cruz &lt;<a=
 href=3D"mailto:agustin.cruz@gmail.com" target=3D"_blank" rel=3D"noreferrer=
">agustin.cruz@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left=
-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><p style=
=3D"font-family:Arial,Helvetica,sans-serif;font-size:small;color:rgb(34,34,=
34)">Dear Bitcoin Developers,</p><p style=3D"font-family:Arial,Helvetica,sa=
ns-serif;font-size:small;color:rgb(34,34,34)">I am writing to share my prop=
osal for a new Bitcoin Improvement Proposal (BIP) titled=C2=A0<strong style=
=3D"font-family:Arial,Helvetica,sans-serif">Quantum-Resistant Address Migra=
tion Protocol (QRAMP)</strong>. The goal of this proposal is to safeguard B=
itcoin against potential future quantum attacks by enforcing a mandatory mi=
gration period for funds held in legacy Bitcoin addresses (secured by ECDSA=
) to quantum-resistant addresses.</p><p style=3D"font-family:Arial,Helvetic=
a,sans-serif;font-size:small;color:rgb(34,34,34)">The proposal outlines:</p=
><ul style=3D"font-family:Arial,Helvetica,sans-serif;font-size:small;color:=
rgb(34,34,34)"><li style=3D"margin-left:15px;font-family:Arial,Helvetica,sa=
ns-serif"><strong style=3D"font-family:Arial,Helvetica,sans-serif">Reducing=
 Vulnerabilities:</strong>=C2=A0Transitioning funds to quantum-resistant sc=
hemes preemptively to eliminate the risk posed by quantum attacks on expose=
d public keys.</li><li style=3D"margin-left:15px;font-family:Arial,Helvetic=
a,sans-serif"><strong style=3D"font-family:Arial,Helvetica,sans-serif">Enfo=
rcing Timelines:</strong>=C2=A0A hard migration deadline that forces timely=
 action, rather than relying on a gradual, voluntary migration that might l=
eave many users at risk.</li><li style=3D"margin-left:15px;font-family:Aria=
l,Helvetica,sans-serif"><strong style=3D"font-family:Arial,Helvetica,sans-s=
erif">Balancing Risks:</strong>=C2=A0Weighing the non-trivial risk of funds=
 being permanently locked against the potential catastrophic impact of a qu=
antum attack on Bitcoin=E2=80=99s security.</li></ul><p style=3D"font-famil=
y:Arial,Helvetica,sans-serif;font-size:small;color:rgb(34,34,34)">Additiona=
lly, the proposal addresses common criticisms such as the risk of permanent=
 fund loss, uncertain quantum timelines, and the potential for chain splits=
. It also details backwards compatibility measures, comprehensive security =
considerations, an extensive suite of test cases, and a reference implement=
ation plan that includes script interpreter changes, wallet software update=
s, and network monitoring tools.</p><p style=3D"font-family:Arial,Helvetica=
,sans-serif;font-size:small;color:rgb(34,34,34)">For your convenience, I ha=
ve published the full proposal on my GitHub repository. You can review it a=
t the following link:</p><p style=3D"font-family:Arial,Helvetica,sans-serif=
;font-size:small;color:rgb(34,34,34)"><a rel=3D"noopener noreferrer" href=
=3D"https://github.com/chucrut/bips/blob/master/bip-xxxxx.md" style=3D"font=
-family:Arial,Helvetica,sans-serif;color:rgb(17,85,204)" target=3D"_blank">=
Quantum-Resistant Address Migration Protocol (QRAMP) Proposal on GitHub</a>=
</p><p style=3D"font-family:Arial,Helvetica,sans-serif;font-size:small;colo=
r:rgb(34,34,34)">I welcome your feedback and suggestions and look forward t=
o engaging in a constructive discussion on how best to enhance the security=
 and resilience of the Bitcoin network in the quantum computing era.</p><p =
style=3D"font-family:Arial,Helvetica,sans-serif;font-size:small;color:rgb(3=
4,34,34)">Thank you for your time and consideration.</p><p style=3D"font-fa=
mily:Arial,Helvetica,sans-serif;font-size:small;color:rgb(34,34,34)">Best r=
egards,</p><p style=3D"font-family:Arial,Helvetica,sans-serif;font-size:sma=
ll;color:rgb(34,34,34)">Agustin Cruz</p>

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