Well, if it's even possible to trade across "chains" with Ripple (and
I don't know of any reason shouldn't be), you will have to wait to the
release of the full node (validator) code, for now only a javascript
web client is open sourced. But it seems they at least have plans for
contracts judging from the wiki:

https://ripple.com/wiki/Contracts

On 2/13/13, Petr Praus <petr@praus.net> wrote:
> Jorge, thanks for bitcoinx tip, I didn't know about it and it's certainly
> related. I'll have a closer look
> Regarding Ripple, I tried it but as far as I can tell, it doesn't have any
> contract enforcement (by technical means) built in.
>
>
> On 11 February 2013 05:03, Jorge Timón <jtimonmv@gmail.com> wrote:
>
>> Hi, you may be interested in a couple of related projects.
>>
>> Colored coins uses satoshis to represent smart property, shares, IOUs
>> of another currency...Colored coins can be atomically traded for
>> bitcoin. If you implement the trade across chains contract they would
>> also be tradeable for another chain currencies like namecoin or
>> freicoin.
>>
>> http://www.bitcoinx.org/
>>
>> Ripple is a concept by which people that trust each other on a network
>> are able to pay with IOUs transitively. It has a new p2p
>> implementation  that is still on development. The new implementation
>> is very similar to bitcoin in certain senses but it has no mining.
>> Bitcoin IOUs can be traded there.
>>
>> https://ripple.com/
>>
>> Good luck with the implementation, this is a good feature to have,
>> even if it's not on the main client.
>>
>>
>> On 2/8/13, Petr Praus <petr@praus.net> wrote:
>> > Hi,
>> >
>> > I intend to implement trading across chains in a P2P manner (as
>> > described
>> > by Mike Hearn in
>> > https://en.bitcoin.it/wiki/Contracts#Example_5:_Trading_across_chains).
>> > Note, this is indended more as an alternative chain development, I
>> > don't
>> > have any plans for merging it back into main client (not because I
>> > don't
>> > want to, but because I think it wouldn't be accepted). Before I dive
>> > into
>> > it, I thought it might be a good idea to ask here if the community has
>> any
>> > useful ideas or comments on this topic?
>> >
>> > Thanks to Gary Rowe I know about Open
>> > Transactions<https://github.com/FellowTraveler/Open-Transactions>.
>> > They can do "multicurrency trading" too, but it's objectives are quite
>> > ambitious and I'm looking at making relatively small changes in the
>> > mainline Bitcoin client rather than diving into something entirely new.
>> >
>> > A little background on why am I doing this, can be found
>> > here<https://groups.google.com/d/topic/bitcoinj/lmVSF8yaJHk/discussion>.
>> > In short it's part of research towards my Master's thesis (more
>> precisely,
>> > an excuse to hack on Bitcoin and sell it as research :)) which should
>> > be
>> > about multicurrency (alternative chains) in Bitcoin.
>> >
>> > Thanks,
>> > Petr
>> >
>> > PS: I hope I'm not too off topic here, but
>> > this<https://bitcointalk.org/index.php?topic=15527.0> thread
>> > indicates it should be fine to post alternative development questions
>> > on
>> > this.
>> >
>>
>>
>> --
>> Jorge Timón
>>
>> http://freico.in/
>> http://archive.ripple-project.org/
>>
>


--
Jorge Timón

http://freico.in/
http://archive.ripple-project.org/