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Running the node#

Create a dedicated folder (such as ~/ergo) for running the node and download the latest Ergo client release .jar

Note that instead of downloading the precompiled Ergo jar, you can clone the repository and compile the jar from the source using SBT by issuing the sbt assembly command. Alternatively, you can also use Docker

Create a configuration file ergo.conf containing the following text

ergo {
    node {
        mining = false

Then issue the following command to run the node for the first time.

java -jar -Xmx4G ergo-*.jar --mainnet -c ergo.conf
  • The -Xmx4G flag sets the max heap size for the JVM. 4-6G recommended.

It is better to use more memory on heap-Xmx4g for initial syncing. -Xmx1g should be enough when node is full synced. The node will start syncing immediately after this. Wait for a few minutes for the API to start and go to the next step.

Note: You can use any name for the file instead of ergo.conf. All configuration parameters are to be passed through this file and you only need to rewrite parameters that you want to change from the default values. The above config file actually has the default values.

The node will start syncing immediately after this.

Securing the API#

We need to set a secret password to protect the API. In this example we'll use hello - but you must use a different and strong secret.

Go to and call the API to compute the Blake2b hash of your secret.

Compute Hash of secret

Copy the hash response which we'll place back in the ergo.conf file.

As you can see hello corresponds to the Blake2b hash 324dcf027dd4a30a932c441f365a25e86b173defa4b8e58948253471b81b72cf


We then need to update the config file with API key hash

    ergo {
      node {
        mining = false

    scorex {
     restApi {
        ## Hex-encoded Blake2b256 hash of an API key. 
        ## Should be 64-chars long Base16 string.
        ## below is the hash of the string 'hello'
        ## replace with your actual hash 
        apiKeyHash = "324dcf027dd4a30a932c441f365a25e86b173defa4b8e58948253471b81b72cf"

Restart and your node should now be syncing and you should be able to access the API.

Check if the node is synced#

While the node is syncing, the panel will show "Active synchronization" (see the image below).

active synchronization

After the node is fully synced, the text will change to "Node is synced", as shown below.


You can also check this at and compare to the latest block height given at


To safely shut down the node, use the following command

curl -X POST "" -H "api_key: hello"

Running this command in a new terminal will let you spot any errors or warnings.

tail -Fn+0 ergo.log | grep 'ERROR\|WARN'

Next Steps