So now, let’s imagine I sent you some BlockchainProgramming Coins. How can you send me back the coins? You need to build a ColoredCoin.
In the sample above, let’s say I want to spend the 10 assets I received on the address “nico”. Here is the coin I want to spend:
{"transactionId": "fa6db7a2e478f3a8a0d1a77456ca5c9fa593e49fd0cf65c7e349e5a4cbe58842","index": 0,"value": 600,"scriptPubKey": "76a914356facdac5f5bcae995d13e667bb5864fd1e7d5988ac","redeemScript": null,"assetId": "AVAVfLSb1KZf9tJzrUVpktjxKUXGxUTD4e","quantity": 10}
Here is how to instantiate such Colored Coin in code:
var coin = new Coin(fromTxHash: new uint256("fa6db7a2e478f3a8a0d1a77456ca5c9fa593e49fd0cf65c7e349e5a4cbe58842"),fromOutputIndex: 0,amount: Money.Satoshis(600),scriptPubKey: new Script(Encoders.Hex.DecodeData("76a914356facdac5f5bcae995d13e667bb5864fd1e7d5988ac")));BitcoinAssetId assetId = new BitcoinAssetId("AVAVfLSb1KZf9tJzrUVpktjxKUXGxUTD4e");ColoredCoin colored = coin.ToColoredCoin(assetId, 10);
We will show you later how you can use some web services or custom code to get the coins more easily. I also needed another coin (forFees), to pay the fees. The asset transfer is actually very easy with the TransactionBuilder.
var book = BitcoinAddress.Create("1KF8kUVHK42XzgcmJF4Lxz4wcL5WDL97PB");var nicoSecret = new BitcoinSecret("??????????", Network.Mainnet);var nico = nicoSecret.GetAddress(); //15sYbVpRh6dyWycZMwPdxJWD4xbfxReeHevar forFees = new Coin(fromTxHash: new uint256("7f296e96ec3525511b836ace0377a9fbb723a47bdfb07c6bc3a6f2a0c23eba26"),fromOutputIndex: 0,amount: Money.Satoshis(4425000),scriptPubKey: new Script(Encoders.Hex.DecodeData("76a914356facdac5f5bcae995d13e667bb5864fd1e7d5988ac")));var builder = Network.Main.CreateTransactionBuilder();var tx = builder.AddKeys(nicoSecret).AddCoins(colored, forFees).SendAsset(book, new AssetMoney(assetId, 10)).SetChange(nico).SendFees(Money.Coins(0.0001m)).BuildTransaction(true);Console.WriteLine(tx);
{…."out": [{"value": "0.00000000","scriptPubKey": "OP_RETURN 4f410100010a00"},{"value": "0.00000600","scriptPubKey": "OP_DUP OP_HASH160 c81e8e7b7ffca043b088a992795b15887c961592 OP_EQUALVERIFY OP_CHECKSIG"},{"value": "0.04415000","scriptPubKey": "OP_DUP OP_HASH160 356facdac5f5bcae995d13e667bb5864fd1e7d59 OP_EQUALVERIFY OP_CHECKSIG"}]}
Which basically succeed: