From: Andreas Schildbach <andreas@schildbach•de>
To: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] New BIP32 structure
Date: Thu, 27 Mar 2014 00:37:46 +0100 [thread overview]
Message-ID: <lgvobr$q44$1@ger.gmane.org> (raw)
In-Reply-To: <CANEZrP2hbBVGqytmXR1rAcVama4ONnR586Se-Ch=dsxOzy2O4w@mail.gmail.com>
Thanks for starting the discussion on finding a better structure.
For me, the most important thing is either we're 100% interoperable or
0%. There should not be anything inbetween, as users will delete seeds
without knowing there is still money in them on another implementation.
I heard from multiple sources that using this standard some wallets will
only see a subset of the addresses/keys of some other wallets.
Implementation differences can always happen (and should addresses as
bugs), but I think its unacceptable that this source of issues is by design.
I suggest we agree on an even simpler least common denominator and
wallets that want to implement some feature on top of that can do but
are encouraged to pick a totally different "cointype". I guess that
would mean removing reserved and account.
I'm still thinking it might be a good idea to have a separate chain for
"refunds". Refunds will be rarely used and thus need a much slower
moving window than receiving addresses or change.
On 03/26/2014 09:49 PM, Mike Hearn wrote:
> Myself, Thomas V (Electrum) and Marek (Trezor) got together to make sure
> our BIP32 wallet structures would be compatible - and I discovered that
> only I was planning to use the default structure.
>
> Because I'm hopeful that we can get a lot of interoperability between
> wallets with regards to importing 12-words paper wallets, we
> brainstormed to find a structure acceptable to everyone and ended up with:
>
> /m/cointype/reserved'/account'/change/n
>
> The extra levels require some explanation:
>
> * cointype: This is zero for Bitcoin. This is here to support two
> things, one is supporting alt coins based off the same root seed.
> Right now nobody seemed very bothered about alt coins but sometimes
> feature requests do come in for this. Arguably there is no need and
> alt coins could just use the same keys as Bitcoin, but it may help
> avoid confusion if they don't.
>
> More usefully, cointype can distinguish between keys intended for
> things like multisig outputs, e.g. for watchdog services. This means
> if your wallet does not know about the extra protocol layers
> involved in this, it can still import the "raw" money and it will
> just ignore/not see the keys used in more complex transactions.
>
> * reserved is for "other stuff". I actually don't recall why we ended
> up with this. It may have been intended to split out multisig
> outputs etc from cointype. Marek, Thomas?
>
> * account is for keeping essentially wallets-within-a-wallet to avoid
> mixing of coins. If you want that.
>
> * change is 0 for receiving addresses, 1 for change addresses.
>
> * n is the actual key index
>
> For bitcoinj we're targeting a deliberately limited feature set for hdw
> v1 so I would just set the first three values all to zero and that is a
> perfectly fine way to be compatible.
>
> The goal here is that the same seed can be written down once, and meet
> all the users needs, whilst still allowing some drift between what
> wallets support.
>
> Pieter made the I think valid point that you can't really encode how
> keys are meant to be used into just an HDW hierarchy and normally you'd
> need some metadata as well. However, I feel interop between wallets is
> more important than arriving at the most perfect possible arrangement,
> which feels a little like bikeshedding, so I'm happy to just go with the
> flow on this one.
>
>
>
> ------------------------------------------------------------------------------
>
>
>
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists•sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
next prev parent reply other threads:[~2014-03-26 23:38 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-26 20:49 Mike Hearn
2014-03-26 23:37 ` Andreas Schildbach [this message]
2014-03-27 1:01 ` Alan Reiner
2014-03-27 6:15 ` Mike Belshe
2014-03-27 10:57 ` Thomas Voegtlin
2014-03-27 11:39 ` Mike Hearn
2014-03-27 13:30 ` Thomas Voegtlin
2014-03-27 13:38 ` Mike Hearn
2014-03-27 1:13 ` Allen Piscitello
2014-03-27 5:34 ` Troy Benjegerdes
2014-03-27 7:09 ` Tamas Blummer
2014-03-27 9:42 ` Mike Hearn
2014-03-27 11:35 ` Pavol Rusnak
2014-03-27 15:43 ` Jeff Garzik
2014-03-27 15:57 ` Allen Piscitello
2014-03-27 16:06 ` Pavol Rusnak
2014-03-27 16:13 ` Allen Piscitello
2014-03-27 16:07 ` Tamas Blummer
2014-03-27 16:14 ` Pieter Wuille
2014-03-27 16:21 ` Pavol Rusnak
2014-03-27 16:28 ` Pieter Wuille
2014-03-27 17:49 ` Allen Piscitello
2014-03-28 14:59 ` slush
2014-04-08 12:43 ` slush
2014-04-08 13:18 ` Pieter Wuille
2014-04-08 13:40 ` slush
2014-04-08 13:43 ` slush
2014-04-08 13:53 ` Pieter Wuille
2014-04-08 13:59 ` Thomas Voegtlin
2014-04-08 14:00 ` Tamas Blummer
2014-04-08 14:35 ` Pavol Rusnak
2014-04-08 15:41 ` slush
2014-04-23 17:42 ` Pieter Wuille
2014-04-23 18:01 ` slush
2014-04-23 18:18 ` slush
2014-04-23 18:39 ` Tier Nolan
2014-04-23 18:46 ` Pavol Rusnak
2014-04-23 19:00 ` Tier Nolan
2014-04-23 19:06 ` slush
2014-04-23 19:36 ` Tamas Blummer
2014-04-23 19:46 ` slush
2014-04-23 19:07 ` Tamas Blummer
2014-04-23 19:29 ` Pavol Rusnak
2014-04-23 19:44 ` Luke-Jr
2014-04-23 19:49 ` Pavol Rusnak
2014-04-23 19:55 ` Luke-Jr
2014-04-23 19:57 ` slush
2014-04-23 20:01 ` Luke-Jr
2014-04-23 20:04 ` Pavol Rusnak
2014-04-23 20:09 ` Luke-Jr
2014-04-23 20:16 ` Pavol Rusnak
2014-04-23 20:32 ` Luke-Jr
2014-04-23 20:35 ` Pavol Rusnak
2014-04-23 20:41 ` Luke-Jr
2014-04-23 20:43 ` Pavol Rusnak
2014-04-23 20:54 ` Pieter Wuille
2014-04-23 21:06 ` Pavol Rusnak
2014-04-23 21:18 ` Luke-Jr
2014-04-23 21:22 ` Gregory Maxwell
2014-04-23 21:33 ` Pavol Rusnak
2014-04-23 21:42 ` Pieter Wuille
2014-04-23 21:44 ` Pavol Rusnak
2014-04-23 21:48 ` Gregory Maxwell
2014-04-23 21:53 ` Luke-Jr
2014-04-23 21:24 ` Pavol Rusnak
2014-04-23 21:07 ` slush
2014-04-23 20:59 ` Luke-Jr
2014-04-23 20:17 ` Tamas Blummer
2014-04-23 20:12 ` Pieter Wuille
2014-04-23 20:08 ` Pieter Wuille
2014-04-23 20:01 ` Tamas Blummer
2014-04-23 20:02 ` Luke-Jr
2014-04-23 20:04 ` Tamas Blummer
2014-04-24 6:54 ` Thomas Voegtlin
2014-04-24 7:10 ` Pieter Wuille
2014-04-24 7:21 ` Gregory Maxwell
2014-04-24 8:15 ` Thomas Voegtlin
2014-04-24 7:42 ` Thomas Voegtlin
2014-04-24 8:09 ` Mike Hearn
2014-04-23 18:48 ` Tamas Blummer
2014-04-08 14:49 ` Andreas Schildbach
2014-04-08 15:46 ` slush
2014-04-08 15:58 ` Andreas Schildbach
2014-04-08 16:24 ` slush
2014-03-27 11:20 ` Thomas Voegtlin
[not found] ` <CAJna-HhmFya+3W67qQt0wMhW=B4vJvwdkr-5WnU+KEaKq7uaUA@mail.gmail.com>
2014-03-27 12:06 ` Thomas Voegtlin
2014-03-27 12:28 ` Mike Hearn
2014-03-27 12:49 ` Mike Hearn
2014-03-27 13:12 ` Thomas Kerin
2014-03-27 13:19 ` Mike Hearn
2014-03-27 13:49 ` Thomas Voegtlin
2014-03-27 13:58 ` Jim
2014-03-27 14:20 ` Mike Hearn
2014-03-27 15:17 ` Troy Benjegerdes
2014-03-27 13:07 ` Matias Alejo Garcia
2014-03-27 13:44 ` Pavol Rusnak
2014-03-27 13:53 ` Thomas Voegtlin
2014-03-27 14:03 ` Pavol Rusnak
[not found] ` <CAJna-HitjJbL9TnfxTY=+TvfaeNvZM6aPWmNYmHUCwmw6V8PUg@mail.gmail.com>
2014-03-27 15:04 ` Thomas Voegtlin
2014-03-27 11:36 ` Pavol Rusnak
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