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Re: [Taler] Exporting coins out of the wallet plugin

From: Marcello Stanisci
Subject: Re: [Taler] Exporting coins out of the wallet plugin
Date: Fri, 21 Jul 2017 13:52:21 +0200
User-agent: NeoMutt/20170609 (1.8.3)

With this feature in place, there is no way to be 100% sure
about wallet's 'abdication' on exported coins.  In other words,
since "owning a coin" means owning a private key, we cannot be sure
that the wallet actually removes that private key from disk, after
coin exportation.

So the coins sharing must always occur between trusted parties.  Unless,
and some "crypto person" may help here, the wallet can export some
"refresh permission" on the exported coins so that the person that gets
it can obatin new private keys for the coin she received from wallet 

- Marcello

> On 07/21/2017 11:29 AM, Sree Harsha Totakura wrote:
> > Hi!
> > 
> > Would it be possible to export individual coins out of the wallet plugin?
> Technically, yes.
> > Such a feature helps in programming custom wallets without the need to
> > perform withdraw on their own.
> Well, I think every reasonable wallet _should_ be able to do
> withdrawals. After all, that's not so complicated.
> > And, if such an export were to be possible, does the wallet have to
> > abdicate the ownership of the coin? i.e take no responsibility of it
> > because the wallet no longer has any history information of the coin,
> > thereby leaving it to custom application to perform refreshing.
> In practice, I think the answer should be "yes". That said, UX-wise I
> would not export a particular coin, but a particular amount.  That said,
> I really do not think this is a feature we should prioritize at all at
> this point.  Eventually, having this will be useful for moving coins
> between wallets "sharing"-style, but I don't quite see a need for this
> for v1.0.
> OTOH, if you do need it urgently, there's probably nothing wrong with
> you writing and implementing a spec for import/export of coins.  What is
> important for me is that whatever file format we define is not for a
> single coin, but for arbitrary amounts (possibly even multi-currency).
> My 2 cents
> -Christian

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