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it's easy to use, but i doubt about the security, it's important to add some secure way for login right, like 2FA.
2FA is supported through Google Authenticator. well for some reason no outgoing payments are being made. They are all bouncing back
Transactions are very slow to confirm in the past few days because of the attack on the network. Coinprism will bounce back the transaction after a few hours to let you spend them again with higher fees. |
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If you've always wondered about the differences between Coinprism/Colored Coins vs Counterparty vs Mastercoin, we've summarized the differences on the website www.bitcoin2comparator.org. Let us know if you have any comment or question! |
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We have now made our colored coins wallet for Android open source. You can access it directly on GitHub. We encourage everyone to modify it and customize it. And again, if you own an Android phone, you can download the wallet and start using colored coins from your mobile: |
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We are happy to anounce the release of Coinprism for Android, the first mobile colored coins wallet. With Coinprism for Android, you will be able to store, send and receive colored coins from your mobile device. It is important to note that it doesn’t require any sign-up on Coinprism or any service. The wallet will generate an HD seed as you start it up for the first time. From then on, the key will be stored encrypted on the device. You can read more on our blog.  |
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FracMine will start selling cloud mining contracts at $1.03 per Gh/s - the cheapest rate on the market. It will take place as a colored coin crowd sale where every colored coin will represent 1 Gh/s and will be sold at $1.03. Comparison with the competition: - FracMine: $1.03 per Gh/s- CEX.IO: $1.81 per Gh/s - SkyCoinLab: $4.49 per Gh/s - GroupBitcoin.com: $2.22 per Gh/s at enterprise price level - MinerKing: $5.90 per Gh/s - KnCMiner: $1.94 per Gh/s - Cloudhashing.com: $2.999 per Gh/s at enterprise price level The flexibility is maximum because every GH/s is represented by a colored coin, which you hold in your wallet. Unline CEX.IO, you can sell it to someone at any time, and at no fees. More info: http://www.fracmine.com
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We're announcing today the support for Proof of Authenticity. Coinprism is the first crypto-asset platform to provide a solution for authenticity. Issuers can validate their real-life identity, that way you can know a Starbucks coin is truly issued by Starbucks Corporation. Verified coins will appear with a green check mark and the name of the issuer will appear prominently.  Whereas unverified coins will appear with an orange exclamation mark:  For more details, check our blog post. |
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We are glad to announce the release of Colorcore: an open source colored coin wallet compatible the open assets protocol and Coinprism. We are also releasing the openassets Python library for developers who want to integrate colored coins. What can you do with Colorcore?Please know that for now, Colorcore is command line and RPC only. For a web-based version, please use Coinprism. Colorcore lets you: - Issue you own coins
Anybody can issue their own coins. It only takes a single Bitcoin transaction. The only fee you have to pay is the Bitcoin transaction fee (which can be zero), which makes Colorcore much more efficient than alternatives like XCP (about $20 to issue an asset).
Also, you don't need to buy any intermediary coin (like XCP) since colored coins work directly on top of Bitcoin. - Send and receive assets
Use your address to receive assets from other people. You can also send assets, again for the price of a standard Bitcoin transaction.
- Manage crowdfunding campaigns
Finally a way to manage a truly decentralized crowdfuding campaign. You don't have to trust a complex and limited exchange protocol, the "distribute" feature creates standard Bitcoin transactions. There is no magic behind it.
Every asset created or exchanged using Colorcore are visible on the coinprism.info block explorer, and can be sent to a Coinprism web-wallet. Installation and dependenciesColorcore does not connect to any external service. All it needs is access to the Bitcoin blockchain, via Bitcoin Core. Therefore in order to run Colorcore, you need Bitcoin Core running with RPC enabled and the -txindex=1 -server=1 flags. Follow these instructions to install Colorcore: - Windows users: make sure you have Python 3 and pip installed on your machine
- Run the following commands:
git clone https://github.com/OpenAssets/colorcore.git
cd colorcore
pip install --upgrade -r requirements.txt
- Edit the config.ini file with the username, password and port for your local Bitcoin Core instance (rpcurl setting).
You are now ready to run Colorcore. How to use it?Get your balanceRun the following command to get your balance: python colorcore.py getbalance
 All the addresses with a non-zero balance on your Bitcoin Core wallet will be displayed. The 'assets' field will show how much assets you have. If you don't have any asset, it will be empty. Each asset has a 'assetAddress' field as well as a 'quantity' field. 'assetAddress' is what identifies the asset. It is cryptographically secure, and it is impossible for two people to be owner of the same asset address. 'quantity' is an integer indicating how many units of that asset you own. Create your own assetFirst, you need to create an address in Bitcoin Core. This address will represent your asset, and the private key associated will be required for any issuance of the asset. Note that the protocol supports multi-sig addresses for issuance, though that is not implemented in Colorcore 1.0. Run the following command on bitcoind (not Colorcore): This will generate a private key and return the address. Make sure your wallet.dat file is properly backed up. Now transfer a small amount of bitcoins (0.0002 BTC is enough) to that newly created address. Run the following command to issue one million colored coins: python colorcore.py issueasset <address> 1000000
You can issue up to 9,223,372,036,854,775,807 colored coins at once. Unlike older colored coins implementations, you only need 0.000006 BTC for issuing coins, regardless of the quantity you want to issue. This command will return a transaction hash. You can look up that transaction hash on the coinprism.info block explorer. How do I give my asset a name?Of course, this is not very useful if you can't identify what asset is what. In order to link information such as a name to your coin, you need to create a metadata file, and host it on your web server. Of course, this doesn't introduce centralization since you are already the issuer of the coin, and the value of your coin (if any) already comes from you. Since you are responsible for the value of the coin you are issuing, it is not an issue if you also host the information about this coin. The metadata file is a JSON file and contains the following information: {
"source_addresses": [
"source address for the coin (can be obtained from the getbalance call)"
],
"contract_url": "https://yoursite.com/more-info-about-the-coin",
"name_short": "ICECC",
"name": "The Ice Cream Coin",
"issuer": "Vanilla Inc",
"description": "This coin is worth an ice cream at any Vanilla Inc shop.",
"description_mime": "text/x-markdown; charset=UTF-8",
"type": "Points",
"divisibility": 0,
"link_to_website": true,
"icon_url": "https://yoursite.com/coin-icon.jpg",
"image_url": "https://yoursite.com/coin-image.jpg",
"version": "1.0"
}
The assuming you have placed that file at: https://yoursite.com/icecream, use the following argument when issuing the coins: python colorcore.py issueasset <address> 1000000 --metadata u=https://yoursite.com/icecream
You can then lookup the color address on coinprism.info, and you should see all that information. Only the URL ( https://yoursite.com/icecream) is stored on the Blockchain. What else?Colorcore also has support for crowdfunding management via the "distribute" command. This feature lets you be at all times in control of how many tokens are issued, and at which price. Colorcore also exposes all those commands via JSON/RPC so that you can easily integrate it server side. Tell me about colored coinsWhat are the benefits of colored coinsBecause colored coins are a powerful, but thin layer on top of Bitcoin, there are many features that colored coins can use out of the box, with no need for any change or special support (unlike alternatives like Counterparty): Because colored coins is built for the future, none of those features require a breaking change, so you don't have to update your client every two week to stay in consensus because of a breaking protocol change. What are the drawbacks of colored coins- It doesn't have native built-in support for rock-paper-scissors
Please don't hesitate to post your feedback, or contact us directly. |
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Is there somewhere that provides zipped snapshots, or bootstrap.dat's of the bitcoin blockchain to speed up downloads?
You can download the blockchain pretty quickly by using BitTorrent, see this thread for more info: https://bitcointalk.org/index.php?topic=145386.0 |
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This sounds great apart from requiring us to download the whole bitcoin blockchain. Will there be some way around this in the future?
Thanks. You can already use Coinprism, which is a lightweight web-based client, and it doesn't store your keys (similar to blockchain.info). Colorcore is mostly for people who want independence from any external service and want full validation. In that case, you need the full blockchain. |
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We are glad to announce the release of Colorcore: an open source colored coin wallet compatible the open assets protocol and Coinprism. We are also releasing the openassets Python library for developers who want to integrate colored coins. What can you do with Colorcore?Please know that for now, Colorcore is command line and RPC only. For a web-based version, please use Coinprism. Colorcore lets you: - Issue you own coins
Anybody can issue their own coins. It only takes a single Bitcoin transaction. The only fee you have to pay is the Bitcoin transaction fee (which can be zero), which makes Colorcore much more efficient than alternatives like XCP (about $20 to issue an asset).
Also, you don't need to buy any intermediary coin (like XCP) since colored coins work directly on top of Bitcoin. - Send and receive assets
Use your address to receive assets from other people. You can also send assets, again for the price of a standard Bitcoin transaction.
- Manage crowdfunding campaigns
Finally a way to manage a truly decentralized crowdfuding campaign. You don't have to trust a complex and limited exchange protocol, the "distribute" feature creates standard Bitcoin transactions. There is no magic behind it.
Every asset created or exchanged using Colorcore are visible on the coinprism.info block explorer, and can be sent to a Coinprism web-wallet. Installation and dependenciesColorcore does not connect to any external service. All it needs is access to the Bitcoin blockchain, via Bitcoin Core. Therefore in order to run Colorcore, you need Bitcoin Core running with RPC enabled and the -txindex=1 -server=1 flags. Follow these instructions to install Colorcore: - Windows users: make sure you have Python 3 and pip installed on your machine
- Run the following commands:
git clone https://github.com/OpenAssets/colorcore.git
cd colorcore
pip install --upgrade -r requirements.txt
- Edit the config.ini file with the username, password and port for your local Bitcoin Core instance (rpcurl setting).
You are now ready to run Colorcore. How to use it?Get your balanceRun the following command to get your balance: python colorcore.py getbalance
All the addresses with a non-zero balance on your Bitcoin Core wallet will be displayed. The 'assets' field will show how much assets you have. If you don't have any asset, it will be empty. Each asset has a 'assetAddress' field as well as a 'quantity' field. 'assetAddress' is what identifies the asset. It is cryptographically secure, and it is impossible for two people to be owner of the same asset address. 'quantity' is an integer indicating how many units of that asset you own. Create your own assetFirst, you need to create an address in Bitcoin Core. This address will represent your asset, and the private key associated will be required for any issuance of the asset. Note that the protocol supports multi-sig addresses for issuance, though that is not implemented in Colorcore 1.0. Run the following command on bitcoind (not Colorcore): This will generate a private key and return the address. Make sure your wallet.dat file is properly backed up. Now transfer a small amount of bitcoins (0.0002 BTC is enough) to that newly created address. Run the following command to issue one million colored coins: python colorcore.py issueasset <address> 1000000
You can issue up to 9,223,372,036,854,775,807 colored coins at once. Unlike older colored coins implementations, you only need 0.000006 BTC for issuing coins, regardless of the quantity you want to issue. This command will return a transaction hash. You can look up that transaction hash on the coinprism.info block explorer. How do I give my asset a name?Of course, this is not very useful if you can't identify what asset is what. In order to link information such as a name to your coin, you need to create a metadata file, and host it on your web server. Of course, this doesn't introduce centralization since you are already the issuer of the coin, and the value of your coin (if any) already comes from you. Since you are responsible for the value of the coin you are issuing, it is not an issue if you also host the information about this coin. The metadata file is a JSON file and contains the following information: {
"source_addresses": [
"source address for the coin (can be obtained from the getbalance call)"
],
"contract_url": "https://yoursite.com/more-info-about-the-coin",
"name_short": "ICECC",
"name": "The Ice Cream Coin",
"issuer": "Vanilla Inc",
"description": "This coin is worth an ice cream at any Vanilla Inc shop.",
"description_mime": "text/x-markdown; charset=UTF-8",
"type": "Points",
"divisibility": 0,
"link_to_website": true,
"icon_url": "https://yoursite.com/coin-icon.jpg",
"image_url": "https://yoursite.com/coin-image.jpg",
"version": "1.0"
}
The assuming you have placed that file at: https://yoursite.com/icecream, use the following argument when issuing the coins: python colorcore.py issueasset <address> 1000000 --metadata u=https://yoursite.com/icecream
You can then lookup the color address on coinprism.info, and you should see all that information. Only the URL ( https://yoursite.com/icecream) is stored on the Blockchain. What else?Colorcore also has support for crowdfunding management via the "distribute" command. This feature lets you be at all times in control of how many tokens are issued, and at which price. Colorcore also exposes all those commands via JSON/RPC so that you can easily integrate it server side. Tell me about colored coinsWhat are the benefits of colored coinsBecause colored coins are a powerful, but thin layer on top of Bitcoin, there are many features that colored coins can use out of the box, with no need for any change or special support (unlike alternatives like Counterparty): Because colored coins is built for the future, none of those features require a breaking change, so you don't have to update your client every two week to stay in consensus because of a breaking protocol change. What are the drawbacks of colored coins- It doesn't have native built-in support for rock-paper-scissors
Please don't hesitate to post your feedback, or contact us directly. |
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Hi all, We're glad to announce the launch of the Coinprism.info colored coin blockchain explorer. It has all the functions of any blockchain explorer (show any transaction or block in the blockchain), but it also shows Colored Coins transactions. You can also find an asset directory, where you can see the top Colored Coin issued assets at www.coinprism.info/assets.   Let us know if you have any feedback! |
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Is it compatible with the open assets standard for colored coins? |
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So now there is Mastercoin, Colored coin, and Counterparty all on the bitcoin block chain making colored coins.
And NXT, Ripple, and Bitshares making colored coins possible on their own chains.
I see how it is cool, but basically it is IOUs from a party you don't really know. This is a hard sell. I am not saying it won't work, but there is a lot of competition now and all are clamoring for the same clients, who are actually few in number.
This might all change. Somebody had to be the first person to use a computer, or smartphone, or bitcoin. To me, all of those seemed like common sense. As for colored coins though, it seems like Ripple has the best model by far. And it is far from doing well.
The major flaw in NXT, Ripple, Bitshares, Mastercoin and counterparty is that they require people to buy a separate currency from Bitcoin. Bitcoin is by far the most used crypto-currency today, and also the most liquid. It is a risk to go and buy and alt-coin when your objective is not speculation. |
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Can you elaborate? how does the issuer of the shares track the movement of their shares on the blockchain? (i.e. I trade my shares with someone and send them to their prism address). I don't believe prism has this functionality.
This is something we are working on. You will be able to see all shareholders of a given coin, and send them dividends. |
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The fact that the metadata is stored on a "central" server is not actually an issue.
Thanks for the response. If we have immutable data storage available to us why not use it? The current methods of metadata storage are antiquated solutions to challenges posed by new technologies. Well we don't need a special immutable data storage, all you need is a hash of the metadata file. That's easy in theory, but would take more than 40 bytes. |
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It's unlikely the FED does anything like this, but a company could easily do it, by either accepting USD deposits and issuing USD-coins in exchange, or simply allowing people to deposit BTC, convert it at the Bitstamp rate, and in the backend, convert the BTC to USD in order to cancel out the exposure.
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What do you mean by broader definition options?
Coinprism includes a link in the transaction that issues an asset using an OP_RETURN output. The link can be user defined, however otherwise directs to a Coinprism hosted page that includes a "contract details" field. Of course, I can't speak for Bytas, though I think that this type of functionality could be valuable. That said, I have significant problems with the way that Coinprism associates contract details with an asset. First, the definitions are centrally hosted, and can be changed at will. Second, an asset can't be verified to be legit if the URL becomes invalid at some point in time. Further, even if you select a custom URL, you're required to have the http:// and .com. I think proper implementation of an asset definition at issuance should be the hash of the contract in the OP_RETURN output. Somebody really creative could even store the contract with Namecoin and indexed by the hash of the contract. This is probably just a pipedream of mine though. I don't know how this is all directly applicable to ChromaWallet given the drastic differences in implementation. Coinprism here. Normally, the asset definition is stored on the website of the issuer. When you buy an asset, you are trusting the good faith of the issuer anyway. Sure, the issuer could change the metadata hosted at that URL, but again he could just as well refuse to redeem your coins. The metadata doesn't really have any legal value, if you want it to have a legal value, you need to find a lawyer and have a proper contract drafted. The fact that the metadata is stored on a "central" server is not actually an issue. Also, in theory, it is possible to put a magnet: url for the metadata, and host in on Bittorrent (though that is not implemented yet). |
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Is there anyway to track colorcoin transactions via Bitcoind?
For example if you want to setup a bitcoind wallet to handle only a specific coin color asset?
Bitcoind is not "color aware" but I suppose an add-on could be written to do exactly what you suggested. The website, http://coloredcoins.org, has a list of the current wallet projects, although I'm not sure if the list is exhaustive. At the moment, only coinprism is compatible with open assets. We plan to make a tool that act as a layer on top of bitcoind, that can let you use colored coins without having to use a third party. |
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Really nice use of colored coins! Here is a tip about your colored coin profile: you should actually put all that description inside the profile (in the description field). The description field supports markdown formatting (see here for details on the syntax). |
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