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From: Greg Maxwell <gmaxwell@gmail.com>
Date: Sun, 15 Jun 2025 17:43:14 +0000
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Subject: Re: [bitcoindev] CTV + CSFS: a letter
To: Jameson Lopp <jameson.lopp@gmail.com>
Cc: Antoine Poinsot <darosior@protonmail.com>, Matt Corallo <lf-lists@mattcorallo.com>,
Andrew Poelstra <apoelstra@wpsoftware.net>,
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On Sun, Jun 15, 2025 at 2:40=E2=80=AFPM Jameson Lopp <jameson.lopp@gmail.co=
m> wrote:
> It's the same problem as securely generating and storing keys. In order
> for presigned transaction vaults to actually be trustworthy then ephemera=
l
> key usage needs to occur on a hardened offline device that is highly
> unlikely to be compromised. I'm not aware of any of the hardware
> manufacturers offering functionality for generating and signing with
> ephemeral keys.
>
What device(s) generates the key/key(s) that can immediately terminate the
vault release and take custody of the coins?
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<div dir=3D"ltr"><div dir=3D"ltr">On Sun, Jun 15, 2025 at 2:40=E2=80=AFPM J=
ameson Lopp <<a href=3D"mailto:jameson.lopp@gmail.com">jameson.lopp@gmai=
l.com</a>> wrote:</div><div class=3D"gmail_quote gmail_quote_container">=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div cla=
ss=3D"gmail_quote"><div>It's the same problem as securely generating an=
d storing keys. In order for presigned transaction vaults to actually be tr=
ustworthy then ephemeral key usage needs to occur on a hardened offline dev=
ice that is highly unlikely to be compromised. I'm not aware of any of =
the hardware manufacturers offering functionality for generating and signin=
g with ephemeral keys.</div></div></div></blockquote><div><br></div><div>Wh=
at device(s) generates the key/key(s) that can immediately terminate the va=
ult release and take custody of the coins?</div><div><br></div><div><br></d=
iv></div></div>
<p></p>
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