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Date: Sat, 18 Jan 2014 15:25:36 -0500
Message-ID: <CANOOu=9t7UxBQWHXS4hVziWqaaDx-D6POK23RNhL5CM8m_JQqg@mail.gmail.com>
From: Christophe Biocca <christophe.biocca@gmail.com>
To: Troy Benjegerdes <hozer@hozed.org>
Content-Type: text/plain; charset=ISO-8859-1
Cc: "bitcoin-development@lists.sourceforge.net"
	<bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] unlinakble static address? & spv-privacy
 (Re: Stealth Addresses)
Precedence: list

Like any other mechanism that puts extra data in the blockchain, the
sender pays the fees.

This mechanism is to improve privacy for static addresses (donation
links on websites and so on). I personally don't think it will be used
nearly as much as BIP0032 or the payment protocol (both of which don't
need on-blockchain data), precisely because it increases the fees
required to send funds, but this doesn't externalize costs anymore
than any other use of the blockchain does.

People who don't care about privacy and want smallest cost and maximum
convenience already use SPV nodes. Their resource usage will not be
affected in the least.

On Sat, Jan 18, 2014 at 12:44 PM, Troy Benjegerdes <hozer@hozed.org> wrote:
> On Wed, Jan 15, 2014 at 05:32:31PM -0800, Gregory Maxwell wrote:
>> On Wed, Jan 15, 2014 at 5:02 PM, Jeremy Spilman <jeremy@taplink.co> wrote:
>> > Choosing how many bits to put in the prefix may be difficult, particularly
>> > if transaction load changes dramatically over time. 0 or 1 bits may be
>> > just fine for a single user running their own node, whereas a central
>> > service might want 4 or 5 bits to keep their computation costs scalable.
>>
>> Ignoring prefixes the cost for each reusable address is only a small
>> percentage of the full node cost (rational: each transaction has one
>> or more ECDSA signatures, and the derivation is no more expensive), so
>> I would only expect computation to be an issue for large centralized
>> services. (non-full nodes suffer more from just the bandwidth impact).
>
> I have not seen anyone address my high-level question to (somewhat) complicated
> mechanisms to keep coin flows private.
>
> Who pays for it? From what I see it's going to double the amount of data
> needed per address, further centralizing 'full' nodes. I'm fine if the NSA
> is paying for privacy (I actually trust them more than banks and advertisers),
> but let's just be honest, okay?
>
> If socializing the cost of privacy is Bitcoin's goal, and giving the benefits
> to a few that understand it and/or have the resources to determine privacy
> providers that won't scam them, then say so, so I can get on with launching
> a 'transparencycoin' with a modified code that explicitly ALWAYS re-uses
> addresses, and has miners and pools that charge more for addresses they have
> never seen before. I bet it will be more distributed and have about half the
> average transaction cost of Bitcoin, because most people *just don't care*
> about privacy if they get cheap and/or free services.
>
>
> -- Troy, transparency advocate who is quite transparent that if you buy me
> farmland, I'll shut up about transparency, because I'll be too busy growing
> food and giving part of it away.
>
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