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

HD Wallets

Upgrade to HD

Aviso

A new backup must be created after upgrading to an HD wallet.

Since version 0.17.0.2, Dash Core has included the ability upgrade a non-hierarchical deterministic (HD) wallet to an HD wallet via the upgradetohd command. The command can be run by either opening the console from Tools -> Debug console or issuing the following RPC command from dash-cli:

upgradetohd "" "" <walletpassphrase>

If your wallet is already encrypted you must enter the passphrase as the third parameter to the command. If your wallet is not already encrypted, specifying a wallet passphrase will trigger wallet encryption.

To see full details for the command, run the following from either the console or dash-cli:

help upgradetohd

Create HD Wallet

Since version 0.12.2.0, Dash Core has included an implementation of BIP39/BIP44 compatible hierarchical deterministic (HD) key generation. This functionality is only available from the command line by specifying the usehd option when starting Dash Core for the first time. Use this function with care, since the mnemonic seed and keys will be stored in plain text until you specify a wallet passphrase. Note that the wallet passphrase is different to the mnemonic passphrase, which is often also referred to as the «25th word» or «extension word». The wallet passphrase encrypts the wallet file itself, while the mnemonic passphrase is used to specify different derivation branches from the same mnemonic seed.

We will use the Windows GUI wallet in this example, but the commands are similar if using dash-qt or dashd on other operating systems. Enter the following command to get started with a randomly generated HD wallet seed and no mnemonic passphrase:

dash-qt.exe --usehd=1

A new HD wallet will be generated and Dash Core will display a warning informing you that you must encrypt your wallet after verifying it works correctly. Open the console from Tools -> Debug console or issue the following RPC command from dash-cli to view the mnemonic seed:

dumphdinfo

Dash Core will display the HD seed in both hexadecimal and as a BIP39 mnemonic. To restore an existing HD wallet, or define your own separately generated mnemonic and/or passphrase, ensure no wallet.dat file exists in the datadir and enter the following command:

dash-qt.exe --usehd=1 --mnemonic="enter mnemonic" --mnemonicpassphrase="optional mnemonic passphrase"

The HD wallet will be restored and your balance will appear once sync is complete.

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
    }
]

Daemon

Dash can be run as a background process (or daemon) on Linux systems. This is particularly useful if you are running Dash as a server instead of as a GUI node. This guide assumes you have installed Dash Core for Linux as described in the Linux Installation Guide.

  1. Create a user and group to run the daemon:

    sudo useradd -m dash -s /bin/bash
    
  2. Create a data directory for Dash in the new user’s home directory:

    sudo -u dash mkdir -p /home/dash/.dashcore
    
  3. Create a configuration file in the new Dash data directory:

    sudo -u dash nano /home/dash/.dashcore/dash.conf
    
  4. Paste the following basic configuration to your dash.conf file, replacing the password with a long and random password:

    listen=1
    server=1
    daemon=1
    
  5. Register the dashd daemon as a system service by creating the following file:

    sudo nano /etc/systemd/system/dashd.service
    
  6. Paste the following daemon configuration into the file:

    [Unit]
    Description=Dash Core Daemon
    After=syslog.target network-online.target
    
    [Service]
    Type=forking
    User=dash
    Group=dash
    OOMScoreAdjust=-1000
    ExecStart=/usr/local/bin/dashd -pid=/home/dash/.dashcore/dashd.pid
    TimeoutStartSec=10m
    ExecStop=/usr/local/bin/dash-cli stop
    TimeoutStopSec=120
    Restart=on-failure
    RestartSec=120
    StartLimitInterval=300
    StartLimitBurst=3
    
    [Install]
    WantedBy=multi-user.target
    
  7. Register and start the daemon with systemd:

    sudo systemctl daemon-reload
    sudo systemctl enable dashd
    sudo systemctl start dashd
    

Dash is now installed as a system daemon. View the status as follows:

systemctl status dashd

View logs as follows:

sudo journalctl -u dashd

Tor

Tor is free and open-source software for enabling anonymous communication. The name derived from the acronym for the original software project name «The Onion Router». Tor directs Internet traffic through a free, worldwide, volunteer overlay network consisting of more than seven thousand relays to conceal a user’s location and usage from anyone conducting network surveillance or traffic analysis.

Dash Core GUI

Dash Core traffic can be directed to pass through Tor by specifying a running Tor service as a proxy. First install Tor by visiting https://www.torproject.org/download/ and downloading the appropriate Tor Browser bundle for your system. Set up the Tor browser by following the documentation on Installation and Running Tor Browser for the First Time.

Once Tor Browser is running, you have two options to configure Dash Core to use Tor for network traffic.

  1. Using the GUI: Start Dash Core and go to Settings > Options > Network and enable the Connect through SOCKS5 proxy setting. Specify 127.0.0.1 for the Proxy IP and 9150 for the Port. Click OK and restart Dash Core.

  2. Using dash.conf: Ensure Dash Core is not running and edit your dash.conf settings file. Add the line proxy=127.0.0.1:9150, save the file and start Dash Core.

You are now connected through the Tor network. You will need to remember to start the Tor Browser each time before you start Dash Core or you will not be able to sync.

Tor onion service

Tor onion services allows other users to connect to your Dash node using an onion address, providing further anonymity by concealing your IP address. Follow these steps to set up an onion service under Ubuntu Linux:

  1. Install tor:

    sudo apt install tor
    
  2. Add the following line to the torrc file:

    sudo bash -c "echo -e 'ControlPort 9051\nCookieAuthentication 1\nCookieAuthFileGroupReadable 1' >> /etc/tor/torrc"
    
  3. Restart Tor:

    sudo systemctl restart tor
    
  4. Determine the group Tor is running under (usually the last entry in your groups file):

    tail /etc/group
    

    The group is usually debian-tor under Debian-based Linux distributions.

  5. Add the user running Dash to the Tor group:

    sudo usermod -aG debian-tor dash
    
  6. Add the following two lines to dash.conf:

    proxy=127.0.0.1:9050
    torcontrol=127.0.0.1:9051
    
  7. Restart Dash and monitor debug.log for onion informatoin:

    grep -i onion ~/.dashcore/debug.log
    

    You should see a line similar to the following:

    2020-06-29 03:43:57 tor: Got service ID knup3fvr6fyvypu7, advertising service knup3fvr6fyvypu7.onion:19999
    

Your onion service is now available at the shown address.

Multiple wallets

It is possible to select between different Dash wallets when starting Dash Core by specifying the wallet argument, or even run multiple instances of Dash Core simultaneously by specifying separate data directories using the datadir argument.

To begin, install the Dash Core wallet for your system according to the installation instructions. When you get to the step Running Dash Core for the first time, you can decide whether you want to maintain separate wallet.dat files in the default location (simpler if you do not need to run the wallets simultaneously), or specify entirely separate data directories such as e.g. C:\Dash1 (simpler if you do want to run the wallets simultaneously).

Separate wallet.dat files

For this scenario, we will create two shortcuts on the desktop, each using a different wallet file. Navigate to the binary file used to start Dash Core (typically locatd at C:\Program Files\DashCore\dash-qt.exe or similar) and create two shortcuts on the desktop. Then open the Properties window for each of these shortcuts.

../../_images/shortcuts.png

Creating desktop shortcuts using Windows 10

Modify the Target property of each shortcut to point to a different wallet file by specifying the wallet argument when starting the wallet. If you do not specify a wallet argument, wallet.dat will be used by default. The specified wallet file will be created if it does not exist. The following example demonstrates two wallets named workwallet.dat and homewallet.dat:

  • Wallet Target 1: "C:\Program Files\DashCore\dash-qt.exe" -wallet=workwallet.dat

  • Wallet Target 2: "C:\Program Files\DashCore\dash-qt.exe" -wallet=homewallet.dat

../../_images/walletfiles.png

Specifying separate wallet files

You can now use the two icons to quickly and easily open different wallets from your desktop. Note that you cannot open both wallets simultaneously. To do this, you will need two separate data directories, as described below.

Separate data directories

Start Dash Core and allow it to synchronize with the network, then close Dash Core again. You can now create two directories at e.g. C:\Dash1 and C:\Dash2 and copy the blocks and chainstate directories from the synchronized data directory into the new directories. Each of these will serve as a separate data directory, allowing you to run two instances of Dash Core simultaneously. Create two (or more) shortcuts on your desktop as described above, then specify arguments for datadir as shown below:

  • Datadir Target 1: "C:\Program Files\DashCore\dash-qt.exe" -datadir=C:\Dash1 -listen=0

  • Datadir Target 2: "C:\Program Files\DashCore\dash-qt.exe" -datadir=C:\Dash2 -listen=0

../../_images/datadirs.png

Specifying separate datadirs

You can now use the two icons to quickly and easily open different wallets simultaneously from your desktop. Both wallets maintain separate and full copies of the blockchain, which may use a lot of drive space. For more efficient use of drive space, consider using an SPV or «light» wallet such as Dash Electrum to maintain multiple separate wallets without keeping a full copy of the blockchain.

../../_images/2wallets.png

Two instances of Dash Core running simultaneously

KeePass

Since version 0.11.0, Dash Core has supported integration with KeePass, the popular open source password manager. This guide describes how to configure the association between Dash Core and KeePass, and how to save a Dash Core wallet passphrase in KeePass using the integration. When this is done, KeePass can be used to unlock the wallet.

Instalação

You will need the following:

If not already installed, install these packages according to the instructions linked below:

Commands

The following KeePass RPC commands are available in the Dash Core client console or server:

keepass genkey

Generates a base64 encoded 256 bit AES key that can be used for communication with KeePassHttp. This is only necessary for manual configuration. Use init for automatic configuration.

keepass init

Sets up the association between Dash and KeePass by generating an AES key and sending an association message to KeePassHttp. This will trigger KeePass to ask for an ID for the association. Returns the association and the base64 encoded string for the AES key.

keepass setpassphrase

Updates the passphrase in KeePassHttp to a new value. This should match the passphrase you intend to use for the wallet. Please note that the standard RPC commands walletpassphrasechange and the wallet encryption from the QT GUI already send the updates to KeePassHttp, so this is only necessary for manual manipulation of the password.

The following new arguments are available for dashd and dash-qt:

keepass

Use KeePass 2 integration using KeePassHttp plugin (default: 0)

keepassport=<port>

Connect to KeePassHttp on port <port> (default: 19455)

keepasskey=<key>

KeePassHttp key for AES encrypted communication with KeePass

keepassid=<name>

KeePassHttp id for the established association

keepassname=<name>

Name to construct url for KeePass entry that stores the wallet passphrase