[Bitcoin-development] Merge avoidance and P2P connection encryption

Paul Rabahy prabahy at gmail.com
Thu Dec 12 17:28:32 UTC 2013


First off, nice article. Very clear and informative.

I don't know if this is the best place to post this, but it seems related
to me.

As more wallets implement BIP32, I believe that bitcoin wallets should
begin to encourage people to use
https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#recurrent-business-to-business-transactions-mi0style
address instead of traditional addresses. In the end, this would
improve privacy because users never need to merge coin if they had one of
these "super addresses".

In addition, "super addresses" would fit nicely into BIP70. Right now, the
PaymentDetails message allows the merchant to provide multiple outputs. If
instead the PaymentDetails provide 1 traditional output (for reverse
compatibility) and 1 "super address", the payment could be broken into as
many pieces as is needed to match unspent outputs already in the customers
wallet. Finally, the refund_to address in Payment could also be upgraded to
a "super address" to enhance privacy there.

I am not sure if there is a large memory requirement for "super addresses",
but to me, it seems that a lot of these privacy enhancing possibilities
will be simple to implement once BIP32 is widely deployed.


On Thu, Dec 12, 2013 at 11:03 AM, Mike Hearn <mike at plan99.net> wrote:

> I wrote an article intended for a broad/non-developer audience on a few
> Bitcoin privacy topics:
>
> - P2P connection encryption
> - Address re-use/payment protocol
> - CoinJoin and merge avoidance
>
> I don't think there's anything much new here for people who were involved
> with the BIP70 design discussions, but it may prove a useful resource when
> talking about privacy features in the payment protocol. Specifically the
> ability to request multiple outputs and submit multiple transactions that
> satisfy them. The article elaborates on how to use that feature to achieve
> some useful privacy outcomes.
>
> I also analyze what using SSL for P2P connections would buy us and what it
> wouldn't.
>
> https://medium.com/p/7f95a386692f
>
>
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