I'm not sure that's true (asked Peter about it):

<petertodd> stealth addresses are "I give you a chain code, you derive new
pubkeys with random 32-byte nonces, and then encrypt that nonce in the tx
itself so I can decrypt it and recover the funds"

if so then combined with CoinJoin this is holy-grail, and we don't need to
worry about Twister/XMPP/BitMessage for transmitting secrets around.

> So sad that you're fed up with me.
>
> This seems great for fairly anonymous payments.
>
> My only problem is if the deterministic offset n is encoded in the paying
> transaction then anyone else you also gave that mpk to, will also see the
> address.
>
> So I still really prefer some solution where payment addresses are
> contracted and signed by a key, for either a one off payment or a sequence
> of payments over a period.
>
> Thanks
> Bob
> On 14 Jan 2014 00:31, "Nicolás Mendoza" <nicolasmendo@???> wrote:
>
>> Thanks for using Drak in your example, I'm fed up with Bob and Alice
>>
>>
>> On Tue, Jan 14, 2014 at 5:29 AM, Amir Taaki <genjix@???> wrote:
>>
>>> great, thanks for showing me this. I know the basic idea. The only
>>> thing
>>> I'd add is that once you know the nonce, that the payor doesn't need to
>>> recreate these txs repeatedly. So when I pay Drak, I only need to do
>>> this the first ever time I pay Drak.
>>>
>>> On 13/01/14 19:49, Drak wrote:
>>> > Have you guys seen this discussion on the bitcoin mailing list (and
>>> now
>>> > there is a working
>>> > implementation):
>>> http://sourceforge.net/mailarchive/message.php?msg_id=31813471
>>> >
>>> > Seems to be a major step forward in terms of privacy. Probably needs
>>> a
>>> > few more technical eyes on it but it looks really promising.
>>> >
>>> > Drak
>>> >
>>> >
>>> > _______________________________________________
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>>> >
>>>
>>>
>>> _______________________________________________
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>>>
>>>
>>
>>
>> --
>> Nicolas Mendoza
>>
>> PhD Researcher
>> School of Creative Media
>> City University of Hong Kong
>> China PDR - HKSAR
>>
>>
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>>
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