[Bitcoin-development] Export format for xpub

Mike Hearn mike at plan99.net
Mon Feb 2 11:33:26 UTC 2015

We generally don't edit BIPs like that after they've been written except to
add helpful links, examples etc and other things that don't add new
functionality. For this you'd write a new BIP. It doesn't have to be hard.
The process is:

1) Adapt the template BIP and fill it out with your motivation, design,
rationale and ideally some examples.

2) Post it here and ask Gregory for a BIP number. He will select one
through some magic algorithm I am still reverse engineering ;)

3) People will give feedback and try to spot problems in your spec.

I looked at what Andreas is doing a few days ago - basically it's just an
xpub string with a ?a=b&c=d query string added to the end, with a hierarchy
type specifier and something else I forgot, encoded into a QR code. So it
should be a very easy BIP to add.

Whilst you're at it you might want to add an HTTP POST based method,
though. Web apps scanning QR codes is kind of clunky compared to just
picking Coyno from a list in the wallet app and having it all
auto-magically activate.

On Mon, Feb 2, 2015 at 9:56 AM, Levin Keller <post at levinkeller.de> wrote:

> Hello everyone,
> I think this is my first email to this mailinglist so I will shortly
> introduce myself:
> I am Levin and the CEO of Coyno (www.coyno.com). Based in Berlin,
> mathematician. Bitcoiner since 2011.
> And now the reason for this email: Andreas (Schildbach) just released a
> new update of his wallet. It now provides an export functionality for the
> m/0' key in order to run read only copies on other devices. We already
> support the format on our website. Of course we would love for this to
> become standard. I also updated the Wiki article for Andreas' Wallet:
> https://en.bitcoin.it/wiki/Bitcoin_Wallet
> How do you like it? How does this format get standard? Shall I try to get
> a pull request to BIP32 passed?
> Cheers
> Levin
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