Jean-Paul, it may be worth noting that the BIP39 word list is integrated into Bitcoinj so will likely become the de facto standard for Android, Trezor web and several desktop wallets. Anyone deviating from that word list would likely find themselves in an isolated pocket.Regarding the timestamp, MultiBit HD uses a simple timestamp of "number of days since midnight of Bitcoin genesis block in UTC with modulo 97 checksum appended". Thus a new seed generated on 27 January 2014 would have "1850/01" as its checksum. When creating a new wallet the users are tested that they have written the timestamp down along with the associated 12/18/24 words.Modulo 97 was chosen since it catches about 99% of errors.On 12 March 2014 15:55, Pavol Rusnak <stick@gk2.sk> wrote:
On 03/12/2014 04:45 PM, Jean-Paul Kogelman wrote:Which is better IMO. I can't imagine anyone writing down a long Base58
> Yes I am. There are some differences between BIP 39 and my proposal though.
>
> - BIP 39 offers an easy list of words, no gnarly string of case sensitive letters and numbers.
encoded string.
Not true, BIP39 supports 12/18/24 words (= 128/192/256 bits of entropy).
> - BIP 39 only offers one fixed length of entropy, always 12 words, no option to increase or decrease the length.
This is nice addition, indeed. But we needed to limit the data as
> - BIP 39 doesn't have a genesis date field, so no optimization during blockchain rescan.
possible in order not to increase the number of words needed to be noted
down.
It has a detection. Not correction though.
> - BIP 39 doesn't have password typo detection. No easy way to recover a password if you know most of it.
True, but having one or two solid options are better than having
> - BIP 39 does not have a user selectable KDF, only 2048 round PBKDF2-HMAC-SHA512.
> - BIP 39 can't outsource the KDF computation to a 3rd party.
gazillions of possible options.
True, but they are encouraged to use the list provided. Possibility to
> - BIP 39 wallet implementors can use their own word lists, breaking cross wallet compatibility.
outsource KDF outside of your "standard" breaks much more compatibility
than this.
--
Best Regards / S pozdravom,
Pavol Rusnak <stick@gk2.sk>
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