Is there any code that does this? I would like to develop a multicoin-qt wallet that runs on two blockchains from one binary, and allows trading using this mechanism between the two chains.
On Mon, Feb 10, 2014 at 02:32:47PM -0500, Peter Todd wrote: > On Sun, Feb 09, 2014 at 03:44:34PM -0500, Peter Todd wrote: > > On Sun, Feb 09, 2014 at 01:04:58PM -0500, Peter Todd wrote: > > > Alex Mizrahi recently outlined a mechanism(1) based on SIGHASH_SINGLE > > > that allows colored coins and similar embedded consensus system assets > > > to be securely transferred to another party in exchange for Bitcoins > > > atomically. In summary his p2p 2-step-trade mechanism operates as > > > follows: > > > > I'm told there's probably at least one if not more earlier > > attributions/reinventions for the 2-step-trade protocol using > > SIGHASH_SINGLE. Please reply with them if you have them so we can give > > credit where credit is due. > > Got this: > > Message-ID: <52418eba.3080...@monetize.io> > Date: Tue, 24 Sep 2013 06:08:10 -0700 > From: Mark Friedenbach <m...@monetize.io> > Organization: Monetize.io Inc. > To: Meni Rosenfeld <m...@bitcoil.co.il> > Subject: Re: Freimarkets and investment > > If assets were tagged you could do a very limited form of pre-signed offers: > > in: 10 btc SINGLE|ANYONECANPAY > out: 1 AAA > > These are composable, in that you can append the inputs and outputs of > multiple offers together and result in a valid transaction. However this > is pretty much the limit of what is possible without adding new SIGHASH > modes, and if you're going to hard-fork to add tagging, then you might > as well go the whole distance with explicit hierarchical > sub-transactions as we did with Freimarkets. > > Cheers, > Mark > > On 9/24/13 5:44 AM, Meni Rosenfeld wrote: > > Hi Jorge, > > > > The video was sent to me by Amos Meiri, I think eToro funded its production. > > > > Maybe I don't understand SIGHASH_ANYONECANPAY very well. In the > > transaction, there will be an output of 1 "my stock" to an initially > > unknown address. Can I provide a signature for my input of 1 "my stock" > > that will be valid even with the output details provided later? > > > > In any case, I think that's out of scope for the presentation. > > > > Meni > > > > On 24/09/2013 13:10, Jorge Timón wrote: > >> Yes, it's a nice presentation. > >> I love the video with the chameleons that you link at the end !! > >> > >> As a little sugestion, I think the biggest advantage of tagging is not > >> inflatable assets, it's open binding orders. Even without granular > >> subtransactions as freimarket has, you could sign your input (say, > >> representing 1 "My stock") and only the output you're interested in > >> (say 100 bitstampUSD to myAddress) with SIGHASH_SINGLE | > >> SIGHASH_ANYONECANPAY. > >> > >> Without tagging, you need to know where the inputs come from to check > >> they're really bitstampUSD, because the network won't enforce the "100 > >> bistampUSD" in your output, any uncolored coins filling the btc > >> quantity you wanted to represent those 100 usd will be ok, for miners. > >> > >> Goog luck with the talk, I'm eager to hear it. > >> > >> By the way, Mark, the explanation of the blockchain image sounds a > >> little bit like hashcasttle, no? well, just merged mining every new > >> asset, sounds like jaromil's freecoin too. > >> > >> > >> On 9/24/13, Meni Rosenfeld <m...@bitcoil.co.il> wrote: > >>> Hi Mark, > >>> > >>> We currently have a more general mathematical framework for the concept of > >>> colored coins - a color is a combination of initial state and a kernel > >>> function that maps input colors to output colors. Order-based coloring is > >>> one such kernel function, tagging is another. As long as you can point at > >>> an > >>> output and say what its color is, we call it a colored coin system. > >>> > >>> The blockchain image is a stand-in for "using a new block chain for each > >>> asset". > >>> > >>> Meni > >>> > >>> On 24/09/2013 00:42, Mark Friedenbach wrote: > > Hi Meni, > > > > I did call Freimarkets "colored coins" in the early days, but the term > > colored coin itself within the community seems to have become > > identified with the specific proposal of assigning value to specific > > satoshis, and running an order based coloring algorithm to determine > > asset flow, e.g. Bitcoin-X. Freimarkets allows issuance of entirely > > new assets and has explicit tagging of outputs, so we decided to avoid > > the phrase "colored coin" so as to keep from confusing people. But as > > an academic, yes you are correct. > > > > You presentation looks great. BTW, what's the first logo for the > > "Alternative token systems" slide? Or is that just a stand-in for the > > block chain? > > > > Mark > > > > On 9/23/13 12:24 PM, Meni Rosenfeld wrote: > >>>>>> Hi, > >>>>>> > >>>>>> As you might know I'm giving a talk about Colored Coins in > >>>>>> Amsterdam. > >>>>>> > >>>>>> My presentation is available at > >>>>>> https://bitcoil.co.il/files/Colored Coins.pptx (I'm not posting > >>>>>> this link publicly until after the talk). > >>>>>> > >>>>>> I'll be happy for any feedback. > >>>>>> > >>>>>> I'm listing Freimarkets as an implementation of Colored Coins. It > >>>>>> doesn't look like you're identifying with the term, but it does fit > >>>>>> the definition (and though it does obviously do much more than > >>>>>> just implement colored coins.) > >>>>>> > >>>>>> Thanks, Meni > >>>> > >>> > >> > > > > -- > 'peter'[:-1]@petertodd.org > 0000000076654614e7bf72ac80d47c57bca12503989f4d602538d3cd7892ca7d > ------------------------------------------------------------------------------ > Androi apps run on BlackBerry 10 > Introducing the new BlackBerry 10.2.1 Runtime for Android apps. > Now with support for Jelly Bean, Bluetooth, Mapview and more. > Get your Android app in front of a whole new audience. 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