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From: Christopher Allen <ChristopherA@lifewithalacrity.com>
Date: Mon, 6 Apr 2020 14:45:37 -0700
Message-ID: <CACrqygCRn5FmSRp_240fRFcgqC+GfX2NOhT4V7teMtHwV6rdMg@mail.gmail.com>
To: Adam Back <adam.back@gmail.com>, 
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>,
 adam@cypherspace.org
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Cc: "Peter D. Gray" <peter@coinkite.com>
Subject: Re: [bitcoin-dev] Deterministic Entropy From BIP32 Keychains
Precedence: list

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Although I believe that there needs to be a review by a cryptographic
engineering expert (ideally Pieter Wuille, who may have to hold his nose to
give it a pragmatic review) and I believe such a review will likely some
suggest some improvements, I do think something in this area should be done=
.

For instance with the offline tool #LetheKit
https://github.com/BlockchainCommons/bc-lethe-kit, you could go to your
vault, input your BIP39 from an offline titanium key or SLIP39 Shamir
shards, and then derive a child key in BIP39 form that can be delivered via
QR from the air-gapped LetheKit to another device you take away.

=E2=80=94 Christopher Allen

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<div><div dir=3D"auto">Although I believe that there needs to be a review b=
y a cryptographic engineering expert (ideally Pieter Wuille, who may have t=
o hold his nose to give it a pragmatic review) and I believe such a review =
will likely some suggest some improvements, I do think something in this ar=
ea should be done.</div></div><div dir=3D"auto"><br></div><div dir=3D"auto"=
>For instance with the offline tool #LetheKit <a href=3D"https://github.com=
/BlockchainCommons/bc-lethe-kit">https://github.com/BlockchainCommons/bc-le=
the-kit</a>, you could go to your vault, input your BIP39 from an offline t=
itanium key or SLIP39 Shamir shards, and then derive a child key in BIP39 f=
orm that can be delivered via QR from the air-gapped LetheKit to another de=
vice you take away.</div><div dir=3D"auto"><br></div><div dir=3D"auto">=E2=
=80=94 Christopher Allen=C2=A0</div>

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