Advanced topics

Coin Control

Coin Control allows users of the Dash Core Wallet to specify which addresses and Unspent Transaction Outputs (UTXOs) should be used as inputs in transactions. This allows you to keep a specific balance on certain addresses in your wallet, while spending others freely. In Dash Core Wallet, click Settings > Options > Wallet > Enable coin control features. Now, when you go to the Send tab in your wallet, a new button labelled Inputs… will appear. Click this button to select which UTXOs can be used as input for any transactions you create. The following window appears:

../../_images/coin-selection.png

Coin Selection window in Dash Core wallet, showing two masternodes (testnet)

Right click on the transaction(s) you do not want to spend, then select Lock unspent. A small lock will appear next to the transaction. You can click the Toggle lock state button to invert the locked/unlocked state of all UTXOs. When you are ready to continue, click OK. You can now safely create transactions with your remaining funds without affecting the locked UTXOs.

../../_images/coin-selection-lock.png
../../_images/coin-selection-locked.png

Locking UTXOs in Dash Core wallet

Multisignature

This section presents a worked example to demonstrate multisig functionality in Dash Core. While the transactions are no longer visible on the current testnet blockchain and some address formats or RPC responses may differ slightly from the version shown here, the principle and commands are the same. The example demonstrates how to set up a 2-of-3 multisig address and create a transaction. The example parties involved are a buyer, a seller and an arbiter. This example is based on:

Step 1: Create three addresses

Seller:

seller@testnet03:~$ ./dash-cli getnewaddress
n18cPEtj4ZfToPZxRszUz2XPts4eGsxiPk
seller@testnet03:~$ ./dash-cli validateaddress n18cPEtj4ZfToPZxRszUz2XPts4eGsxiPk
{
    "isvalid" : true,
    "address" : "n18cPEtj4ZfToPZxRszUz2XPts4eGsxiPk",
    "ismine" : true,
    "isscript" : false,
    "pubkey" : "02a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e",
    "iscompressed" : true,
    "account" : ""
}
seller@testnet03:~$ ./dash-cli dumpprivkey n18cPEtj4ZfToPZxRszUz2XPts4eGsxiPk
cVQVgBr8sW4FTPYz16BSCo1PcAfDhpJArgMPdLxKZQWcVFwMXRXx

Buyer:

buyer@testnet03:~$ ./dash-cli getnewaddress
mp5orHuaFaHCXFSCeYvUPL7H16JU8fKG6u
buyer@testnet03:~$ ./dash-cli validateaddress mp5orHuaFaHCXFSCeYvUPL7H16JU8fKG6u
{
    "isvalid" : true,
    "address" : "mp5orHuaFaHCXFSCeYvUPL7H16JU8fKG6u",
    "ismine" : true,
    "isscript" : false,
    "pubkey" : "0315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c",
    "iscompressed" : true,
    "account" : ""
}
buyer@testnet03:~$ ./dash-cli dumpprivkey mp5orHuaFaHCXFSCeYvUPL7H16JU8fKG6u
cP9DFmEDb11waWbQ8eG1YUoZCGe59BBxJF3kk95PTMXuG9HzcxnU

Arbiter:

arbiter@testnet03:~$ ./dash-cli getnewaddress
n1cZSyQXhach5rrj2tm5wg6JC7uZ3qPNiN
arbiter@testnet03:~$ ./dash-cli validateaddress n1cZSyQXhach5rrj2tm5wg6JC7uZ3qPNiN
{
    "isvalid" : true,
    "address" : "n1cZSyQXhach5rrj2tm5wg6JC7uZ3qPNiN",
    "ismine" : true,
    "isscript" : false,
    "pubkey" : "0287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce",
    "iscompressed" : true,
    "account" : ""
}
arbiter@testnet03:~$ ./dash-cli dumpprivkey n1cZSyQXhach5rrj2tm5wg6JC7uZ3qPNiN
cUbDFL81a2w6urAGZf7ecGbdzM82pdHLeCaPXdDp71s96SzDV49M

This results in three keypairs (public/private):

seller:    02a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e / cVQVgBr8sW4FTPYz16BSCo1PcAfDhpJArgMPdLxKZQWcVFwMXRXx
buyer:     0315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c / cP9DFmEDb11waWbQ8eG1YUoZCGe59BBxJF3kk95PTMXuG9HzcxnU
arbiter:   0287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce / cUbDFL81a2w6urAGZf7ecGbdzM82pdHLeCaPXdDp71s96SzDV49M

Step 2: Create multisig address

The createmultisig command takes as variables the number n signatures of m keys (supplied as json array) required. In this example, 2 of 3 keys are required to sign the transaction.

Note: The address can be created by anyone, as long as the public keys and their sequence are known (resulting address and redeemScript are identical, see below).

Seller:

seller@testnet03:~$ ./dash-cli createmultisig 2 '["02a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e","0315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c","0287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce"]'
{
    "address" : "2MuEQCZh7VB8pNrT4bj1CFZQh2oK7XZYLQf",
    "redeemScript" : "522102a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e210315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c210287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce53ae"
}

Buyer:

buyer@testnet03:~$ ./dash-cli createmultisig 2 '["02a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e","0315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c","0287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce"]'
{
    "address" : "2MuEQCZh7VB8pNrT4bj1CFZQh2oK7XZYLQf",
    "redeemScript" : "522102a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e210315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c210287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce53ae"
}

Arbiter:

arbiter@testnet03:~$ ./dash-cli createmultisig 2 '["02a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e","0315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c","0287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce"]'
{
    "address" : "2MuEQCZh7VB8pNrT4bj1CFZQh2oK7XZYLQf",
    "redeemScript" : "522102a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e210315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c210287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce53ae"
}

Step 3: Buyer funds the multisig address

This works the same as a usual transaction.

Buyer:

buyer@testnet03:~$ ./dash-cli sendtoaddress 2MuEQCZh7VB8pNrT4bj1CFZQh2oK7XZYLQf 777.77
a8b3bf5bcace91a8dbbddbf9b7eb027efb9bd001792f043ecf7b558aaa3cb951

The seller/arbiter can trace the transaction by its txid in the block explorer. Or from the console as follows.

Buyer:

seller@testnet03:~$ ./dash-cli getrawtransaction a8b3bf5bcace91a8dbbddbf9b7eb027efb9bd001792f043ecf7b558aaa3cb951 1
{
    "hex" : "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    "txid" : "a8b3bf5bcace91a8dbbddbf9b7eb027efb9bd001792f043ecf7b558aaa3cb951",
    "version" : 1,
    "locktime" : 0,
[...]
    "vout" : [
        {
            "value" : 777.77000000,
            "n" : 0,
            "scriptPubKey" : {
                "asm" : "OP_HASH160 15c85c2472f5941b60a49462a2cfd0d17ab49d1c OP_EQUAL",
                "hex" : "a91415c85c2472f5941b60a49462a2cfd0d17ab49d1c87",
                "reqSigs" : 1,
                "type" : "scripthash",
                "addresses" : [
                    "2MuEQCZh7VB8pNrT4bj1CFZQh2oK7XZYLQf"
                ]
            }
        },
[...]
    ],
    "blockhash" : "000000034def806f348cadf6a80660aed1cfc30ccbd1492a8ea87062800ea94d",
    "confirmations" : 3,
    "time" : 1409224896,
    "blocktime" : 1409224896
}

Step 4: Spending the multisig

Now we assume the deal is complete, the buyer got the goods and everyone is happy. Now the seller wants to get his Dash. As a 2-of-3 multisig was used, the transaction must be signed by 2 parties (seller + buyer or arbiter). The seller creates a transaction (we will reuse his public address from above).

Seller:

seller@testnet03:~$ ./dash-cli createrawtransaction '[{"txid":"a8b3bf5bcace91a8dbbddbf9b7eb027efb9bd001792f043ecf7b558aaa3cb951","vout":0}]' '{"n18cPEtj4ZfToPZxRszUz2XPts4eGsxiPk":777.77}'
010000000151b93caa8a557bcf3e042f7901d09bfb7e02ebb7f9dbbddba891ceca5bbfb3a80000000000ffffffff0140d6de1b120000001976a914d728be76cd74b5d148eba2a49246b80dac12f73e88ac00000000

And partially signs it, using the redeemScript, scriptPubKey and his private key

Seller:

seller@testnet03:~$ ./dash-cli signrawtransaction '010000000151b93caa8a557bcf3e042f7901d09bfb7e02ebb7f9dbbddba891ceca5bbfb3a80000000000ffffffff0140d6de1b120000001976a914d728be76cd74b5d148eba2a49246b80dac12f73e88ac00000000' '[{"txid":"a8b3bf5bcace91a8dbbddbf9b7eb027efb9bd001792f043ecf7b558aaa3cb951","vout":0,"scriptPubKey":"a91415c85c2472f5941b60a49462a2cfd0d17ab49d1c87","redeemScript":"522102a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e210315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c210287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce53ae"}]' '["cVQVgBr8sW4FTPYz16BSCo1PcAfDhpJArgMPdLxKZQWcVFwMXRXx"]'
{
    "hex" : "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",
    "complete" : false
}

Note that the output hex is getting longer, but complete flag is “false” as the transaction needs another signature. So now either the buyer or the arbiter can complete the signature of the transaction, using the output from above and their private key. Let’s assume the buyer is completing the signature.

Buyer:

buyer@testnet03:~$ ./dash-cli signrawtransaction '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' '[{"txid":"a8b3bf5bcace91a8dbbddbf9b7eb027efb9bd001792f043ecf7b558aaa3cb951","vout":0,"scriptPubKey":"a91415c85c2472f5941b60a49462a2cfd0d17ab49d1c87","redeemScript":"522102a862b412ff9e3afd01a2873a02622897f6df92e3fc85597788b898309fec882e210315617694c9d93f0ce92769e050a6868ffc74d229077379c0af8bfb193c3d351c210287ce6cf69b85593ce7db801874c9a2fb1b653dbe5dd9ebfa73e98b710af9e9ce53ae"}]' '["cP9DFmEDb11waWbQ8eG1YUoZCGe59BBxJF3kk95PTMXuG9HzcxnU"]'
{
    "hex" : "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",
    "complete" : true
}

The signature is complete now, and either of the parties can transmit the transaction to the network.

Buyer:

buyer@testnet03:~$ ./dash-cli sendrawtransaction 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
cf1a75672006a05b38d94acabb783f81976c9e83a8de4da9cbec0de711cf2d71

Again, this transaction can be traced in a block explorer. And the seller is happy to receive his coins at his public address as follows.

Seller:

seller@testnet03:~$ dash-cli listtransactions "" 1
[
    {
        "account" : "",
        "address" : "n18cPEtj4ZfToPZxRszUz2XPts4eGsxiPk",
        "category" : "receive",
        "amount" : 777.77000000,
        "confirmations" : 17,
        "blockhash" : "000000067a13e9bd5c1d5ff48cb4b9f8414a6adcc470656262731bfd013510dd",
        "blockindex" : 9,
        "blocktime" : 1409228449,
        "txid" : "cf1a75672006a05b38d94acabb783f81976c9e83a8de4da9cbec0de711cf2d71",
        "time" : 1409227887,
        "timereceived" : 1409227887
    }
]