William,

I believe the reasoning for this is stated in the Coin Type section.

"Public derivation is used so that cosigners need only know one of each other's public keys, rather than needing to distribute public keys for each coin."

BIP44 has a coin level, but it's a private derived level, so cosigners would not be able to generate multiple crypto currencies of each others' without giving each other n xpubs where n is the number of currencies shared. This new proposal basically sticks coin type on the public derivation side of things so that I could generate litecoin or darkcoin multisigs without your permission...

Kefkius,

This BIP seems like a good fit for multi-currency wallets based on multisig. So kudos for putting it in writing.

However, I don't know if this is really a BIP thing. It's not improving Bitcoin (Bitcoin Improvement Proposal... remember?), in fact, by definition it is improving altcoin usability.

For that reason alone I will say I disagree for a BIP for this.
- Jona


2015-04-08 16:46 GMT+09:00 William Swanson <swansontec@gmail.com>:
>
> It's not really clear why this is better than BIP 44 as it already
> stands. You have the same fields, but they are just in a different
> order. Couldn't you just use the existing BIP 44 hierarchy, but add
> the convention that "wallet/account N" is the same wallet in each
> supported currency?
>
> For example, if I have a wallet called "business expenses", which
> happens to be wallet m / 44' / 0' / 5', for Bitcoin, then the same
> wallet would be m / 44' / 3' / 5' for Dogecoin, and m / 44' / 2' / 5'
> for Litecoin.
>
> I am trying to think of examples where your proposal is better than
> BIP 44, but I can't think of any. Even backup recovery works fine. I
> assume that your idea is to continue iterating over the different
> wallet indices as long as you are finding funds in *any* currency.
> Well, you can still do that with BIP 44. The fields are in a different
> order, but that doesn't affect the algorithm in any way.
>
> Maybe you have some deeper insight I'm not seeing, but if so, you need
> to clearly explain that in your motivation section. The current
> explanation, "This limits the possible implementations of
> multi-currency, multisignature wallets," is pretty vauge. Also, there
> is nothing in this spec that addresses the multisignature use-case.
> The BIP 45 spec does a lot of extra work to make multisignature work
> smoothly.
>
> I'm not trying to criticize your proposal. I'm just trying to
> understand what it's trying to accomplish.
>
> -William Swanson
>
>
> On Wed, Apr 8, 2015 at 12:05 AM, Kefkius <kefkius@maza.club> wrote:
> > I have a potential BIP, "Multi-Currency Hierarchy For Use In
> > Multisignature Deterministic Wallets." I'm requesting discussion on it,
> > and possibly assignment of a BIP number.
> >
> > It's located in this github gist:
> > https://gist.github.com/Kefkius/1aa02945e532f8739023
> >
> > ------------------------------------------------------------------------------
> > BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
> > Develop your own process in accordance with the BPMN 2 standard
> > Learn Process modeling best practices with Bonita BPM through live exercises
> > http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_
> > source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
> > _______________________________________________
> > Bitcoin-development mailing list
> > Bitcoin-development@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
> ------------------------------------------------------------------------------
> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
> Develop your own process in accordance with the BPMN 2 standard
> Learn Process modeling best practices with Bonita BPM through live exercises
> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_
> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development




--
-----BEGIN PGP PUBLIC KEY BLOCK-----
Comment: http://openpgpjs.org

xsBNBFTmJ8oBB/9rd+7XLxZG/x/KnhkVK2WBG8ySx91fs+qQfHIK1JrakSV3
x6x0cK3XLClASLLDomm7Od3Q/fMFzdwCEqj6z60T8wgKxsjWYSGL3mq8ucdv
iBjC3wGauk5dQKtT7tkCFyQQbX/uMsBM4ccGBICoDmIJlwJIj7fAZVqGxGOM
bO1RhYb4dbQA2qxYP7wSsHJ6/ZNAXyEphOj6blUzdqO0exAbCOZWWF+E/1SC
EuKO4RmL7Imdep7uc2Qze1UpJCZx7ASHl2IZ4UD0G3Qr3pI6/jvNlaqCTa3U
3/YeJwEubFsd0AVy0zs809RcKKgX3W1q+hVDTeWinem9RiOG/vT+Eec/ABEB
AAHNI2tpbm9zaGl0YSA8a2lub3NoaXRham9uYUBnbWFpbC5jb20+wsByBBAB
CAAmBQJU5ifRBgsJCAcDAgkQRB9iZ30dlisEFQgCCgMWAgECGwMCHgEAAC6Z
B/9otobf0ASHYdlUBeIPXdDopyjQhR2RiZGYaS0VZ5zzHYLDDMW6ZIYm5CjO
Fc09ETLGKFxH2RcCOK2dzwz+KRU4xqOrt/l5gyd50cFE1nOhUN9+/XaPgrou
WhyT9xLeGit7Xqhht93z2+VanTtJAG6lWbAZLIZAMGMuLX6sJDCO0GiO5zxa
02Q2D3kh5GL57A5+oVOna12JBRaIA5eBGKVCp3KToT/z48pxBe3WAmLo0zXr
hEgTSzssfb2zTwtB3Ogoedj+cU2bHJvJ8upS/jMr3TcdguySmxJlGpocVC/e
qxq12Njv+LiETOrD8atGmXCnA+nFNljBkz+l6ADl93jHzsBNBFTmJ9EBCACu
Qq9ZnP+aLU/Rt6clAfiHfTFBsJvLKsdIKeE6qHzsU1E7A7bGQKTtLEnhCCQE
W+OQP+sgbOWowIdH9PpwLJ3Op+NhvLlMxRvbT36LwCmBL0yD7bMqxxmmVj8n
vlMMRSe4wDSIG19Oy7701imnHZPm/pnPlneg/Meu/UffpcDWYBbAFX8nrXPY
vkVULcI/qTcCxW/+S9fwoXjQhWHaiJJ6y3cYOSitN31W9zgcMvLwLX3JgDxE
flkwq/M+ZkfCYnS3GAPEt8GkVKy2eHtCJuNkGFlCAmKMX0yWzHRAkqOMN5KP
LFbkKY2GQl13ztWp82QYJZpj5af6dmyUosurn6AZABEBAAHCwF8EGAEIABMF
AlTmJ9QJEEQfYmd9HZYrAhsMAABKbgf/Ulu5JAk4fXgH0DtkMmdkFiKEFdkW
0Wkw7Vhd5eZ4NzeP9kOkD01OGweT9hqzwhfT2CNXCGxh4UnvEM1ZMFypIKdq
0XpLLJMrDOQO021UjAa56vHZPAVmAM01z5VzHJ7ekjgwrgMLmVkm0jWKEKaO
n/MW7CyphG7QcZ6cJX2f6uJcekBlZRw9TNYRnojMjkutlOVhYJ3J78nc/k0p
kcgV63GB6D7wHRF4TVe4xIBqKpbBhhN+ISwFN1z+gx3lfyRMSmiTSrGdKEQe
XSIQKG8XZQZUDhLNkqPS+7EMV1g7+lOfT4GhLL68dUXDa1e9YxGH6zkpVECw
Spe3vsHZr6CqFg==
=/vUJ
-----END PGP PUBLIC KEY BLOCK-----