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From: Jim <jim618@fastmail.co.uk>
To: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] New BIP32 structure
Date: Thu, 27 Mar 2014 13:58:19 +0000	[thread overview]
Message-ID: <1395928699.5369.99593201.1CFF9238@webmail.messagingengine.com> (raw)
In-Reply-To: <53342C6C.2060006@gmx.de>

Good to hear the bip32 wallet structure is _so_ close to being standardised.
For MultiBit HD, we have put in support for 12/18/24 words but have the UI 'suggest' to use 12.
You can see this on the wallet creation wizard Gary recently blogged about:
https://multibit.org/blog/2014/03/26/multibit-hd-welcome-wizard.html

There's a little combo for the seed length, with 12 as the default.


@Thomas. You mention gaps. We are creating new addresses on the UI in a panel marked 'Request' where the user also types in a QR code label and a note to themselves. This gets stored away as a first class 'PaymentRequest'. The UI 'suggests' that each address is used once. There will be some gaps (where the payment request is never paid) but we aren't bulk creating addresses. I am hoping this shouldn't cause Electrum a problem.

We are also storing a timestamp (the number of days since the genesis block) to help wallet restore but that is SPV specific.


On Thu, Mar 27, 2014, at 01:49 PM, Thomas Voegtlin wrote:
> 
> 
> Le 27/03/2014 13:49, Mike Hearn a écrit :
IP32 allows for a range of entropy sizes and it so happens that
> > they picked 256 bits instead of 128 bits.
> >
> > I'd have thought that there is a right answer for this. 2^128 should not
> > be brute forceable, and longer sizes have a cost in terms of making the
> > seeds harder to write down on paper. So should this be a degree of freedom?
> >
> 
> 
> Here is what I understand:
> 
> 2^128 iterations is not brute forcable today, and will not be for the 
> foreseeable future.
> 
> An EC pubkey of length n can be forced in approximately 2^(n/2) 
> iterations (see http://ecc-challenge.info/) Thus, Bitcoin pubkeys, which 
> are 256 bits, would require 2^128 iterations. This is why unused 
> addresses (160 bits hash) are better protected than already used ones.
> 
> However, people tend to believe that a public key of size n requires 2^n 
> iterations. This belief might have been spread by this popular image:
> https://bitcointalk.org/index.php?topic=508880.msg5616146#msg5616146
> 
> 
> ------------------------------------------------------------------------------
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development


-- 
http://bitcoin-solutions.co.uk



  reply	other threads:[~2014-03-27 13:58 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-26 20:49 [Bitcoin-development] New BIP32 structure Mike Hearn
2014-03-26 23:37 ` Andreas Schildbach
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 [this message]
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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