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Date: Tue, 8 Apr 2014 15:18:52 +0200
Message-ID: <CAPg+sBg8wDH9yTUoyhRbuzVtbD8hGxya8tOnV4pMToHy3gLrzw@mail.gmail.com>
From: Pieter Wuille <pieter.wuille@gmail.com>
To: slush <slush@centrum.cz>
Content-Type: text/plain; charset=ISO-8859-1
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] New BIP32 structure
Precedence: list

I still don't understand the purpose of cointype. If you don't want to
risk reusing the same keys across different currencies, just don't use
the same seed or the same account? That is purely a client-side issue.

If the consensus is to add the cointype anyway, can we fix it to be
equal to the 4-byte magic in the serialization (after setting the high
bit to true)? That way there aren't two 4-byte magic codes that need
to be defined for each, and at the same time make it obvious from the
serialized form what it is for.


On Tue, Apr 8, 2014 at 2:43 PM, slush <slush@centrum.cz> wrote:
> After some off-list discussion about details with wallet developers, it
> seems that structure
>
> m/<cointype>'/<account>'/<change>/<n>
>
> fulfill requirements of all wallet developers around, including myTrezor,
> Electrum, Multibit, Wallet32 and other software is willing to adapt once
> anything will be standardized (i.e. they don't care).
>
> Because I think that everybody told their comments to the topic already and
> because it seems that there's quite wide agreement on that, I would like to
> close the discussion and finally implement these paths into our software.
>
> Cheers,
> Marek
>
>
> On Fri, Mar 28, 2014 at 3:59 PM, slush <slush@centrum.cz> wrote:
>>
>> I agree that 'version' field of bip32 is not necessary and xpriv/xpub
>> should be enough for all cases; there's actually no need to use different
>> BIP32 roots for different altcoins.
>>
>> I'm happily using one xpub for Bitcoin/Testnet/Litecoin at once, and by
>> having the "cointype" distinction in the bip32 path itself, I'm sure that I
>> don't reuse the same pubkey across blockchains which may be a privacy issue
>> otherwise.
>>
>> Marek
>>
>>
>> On Thu, Mar 27, 2014 at 5:28 PM, Pieter Wuille <pieter.wuille@gmail.com>
>> wrote:
>>>
>>> On Thu, Mar 27, 2014 at 5:21 PM, Pavol Rusnak <stick@gk2.sk> wrote:
>>> > Cointype in path is for separation purposes, not for identification.
>>>
>>> I don't understand what that gains you.
>>>
>>> --
>>> Pieter
>>>
>>>
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>>> Bitcoin-development@lists.sourceforge.net
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>>
>>
>
>
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