From: "Eric Lombrozo" <elombrozo@gmail.com>
To: "Tamas Blummer" <tamas@bitsofproof.com>, "Eric Lombrozo via bitcoin-dev"
	<bitcoin-dev@lists.linuxfoundation.org>
Date: Sat, 21 Nov 2015 08:45:10 +0000
Message-Id: <em5e7d40c8-cabe-487e-a6ad-dfa73bbb4867@platinum>
In-Reply-To: <9F747105-0BE5-48B0-9032-A0B4CBFC8A66@bitsofproof.com>
Reply-To: "Eric Lombrozo" <elombrozo@gmail.com>
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Subject: Re: [bitcoin-dev] Dynamic Hierarchical Deterministic Key Trees
Precedence: list

Tamas,

You could use a key for both signing and for derivation of a deeper=20
level (and perhaps there are some applications for this, if you think of=
=20
any please let me know), but the use cases being considered involve=20
generation of signing key sequences from seeds that are easy to backup=20
and easy to share with others to simplify multidevice synchronization,=20
key management, account structures, etc... while also allowing for=20
privacy by making it nontrivial to associate transactions for an account=
=20
without knowing the seed/chain code.

As such, we generally refer to such sequences by a path to the immediate=
=20
parent node in the tree and reserve the children themselves for the=20
signing keys.


- Eric


------ Original Message ------
From: "Tamas Blummer" <tamas@bitsofproof.com>
To: "Eric Lombrozo" <elombrozo@gmail.com>; "Eric Lombrozo via=20
bitcoin-dev" <bitcoin-dev@lists.linuxfoundation.org>
Sent: 11/17/2015 5:10:17 AM
Subject: Re: [bitcoin-dev] Dynamic Hierarchical Deterministic Key Trees

>Hi Eric,
>
>Would you please enumerate, or point to, arguments that discourage the=20
>use of a key both for signing and for derivation of a deeper level of=20
>the hierarchy ?
>
>Tamas Blummer
>
>>  On Nov 17, 2015, at 12:40, Eric Lombrozo via bitcoin-dev=20
>><bitcoin-dev@lists.linuxfoundation.org> wrote:
>>
>>  I've submitted a BIP proposal that solves the issue of needing to=20
>>predefine HD wallet structures and not being able to arbitrarily nest=20
>>deeper levels. Comments appreciated.
>>
>>  https://github.com/bitcoin/bips/pull/242
>>
>>
>>  - Eric
>>  _______________________________________________
>>  bitcoin-dev mailing list
>>  bitcoin-dev@lists.linuxfoundation.org
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>