# Node Configuration

Waves node parameters are stored in the node configuration file (*.conf). The system uses HOCON (Human-Optimized Config Object Notation) format that provides simple syntax and ability to use comments. Read more about HOCON.

For a node installed from the APT repository or from a DEB package, the configuration file is embedded into the package, see the Install Node on Ubuntu article. For a node installed from a JAR file, download the sample configuration file waves-sample.conf.

# Required Parameters

In most cases, such as running a node from scratch, it is sufficient to set the following required parameters specific for your node:

waves.wallet.seed if you want the node to generate blocks or sign transactions on behalf of a particular account;
waves.wallet.password;
waves.rest-api.api-key-hash to use node API;
waves.blockchain.type.

For the rest of the parameters, we recommend to leave the default values.

# Changing Node Parameters

After editing the configuration file, restart the node.

For the node installed from a JAR file, specify the path to the edited configuration file in the start command (replace {*} with the actual file name):

java -jar {*}.jar {*}.conf

# Sections of the Configuration File

Node configuration file contains parameters grouped into the following sections:

Section	Description
waves	Essential node parameters and other configuration subsections
db	Blockchain database parameters
network	Peer to peer network parameters
wallet	Built in node wallet parameters
blockchain	Blockchain parameters
miner	Blocks generator parameters
rest-api	Node API parameters
synchronization	Node synchronization parameters
utx	Unconfirmed transactions pool parameters
features	Features parameters
rewards	Rewards parameters
extensions	Extensions parameters
kamon	Performance metrics parameters
metrics	Blocks, transactions and other info metrics parameters

# Waves Configuration Section

Root configuration section waves holds essential application parameters and other configuration subsections.

Using the enable-light-mode parameter, you can enable and disable the light mode. In the light mode, the node applies ready-made state snapshots without performing transaction validation, and thus significantly speeds up block processing. The default value is no. Light mode is enabled by feature #22 “Light Node”.

With the directory parameter, you can set a path to the base application directory. It is possible to use environment variables to set configuration parameters. For example, by default, the base directory constructed relative to the user’s HOME environment variable. Please, do not enclose environment variables references in quotes, in this case, they will be handled as strings and won’t be resolved.

Make sure the defined directory has a correct owner set: waves, waves-testnet or waves-stagenet for mainnet, testnet or stagenet.

# Default Application Directory

The paths listed below are used by default if the directory parameter is not specified in the configuration file.

For nodes installed from DEB package:

	*nix
Mainnet	`/var/lib/waves`
Testnet	`/var/lib/waves-testnet`
Stagenet	`/var/lib/waves-stagenet`

The following default application directories, depending on the operating system and the type of blockchain, are used for jar nodes if the directory parameter is not set in the node configuration .conf file:

	*nix	macOS	Windows
Mainnet	`$XDG_DATA_HOME/waves-mainnet` or `$HOME/.local/share/waves-mainnet`	`$HOME/Library/Application Support/waves-mainnet`	`%LOCALAPPDATA%/waves-mainnet`
Testnet	`$XDG_DATA_HOME/waves-testnet` or `$HOME/.local/share/waves-testnet`	`$HOME/Library/Application Support/waves-testnet`	`%LOCALAPPDATA%/waves-testnet`
Stagenet	`$XDG_DATA_HOME/waves-stagenet` or `$HOME/.local/share/waves-stagenet`	`$HOME/Library/Application Support/waves-stagenet`	`%LOCALAPPDATA%/waves-stagenet`
Custom	`$XDG_DATA_HOME/waves-custom-<character>` or `$HOME/.local/share/waves-custom-<character>`	`$HOME/Library/Application Support/waves-custom-<character>*`	`%LOCALAPPDATA%/waves-custom-<character>*`

* See address-scheme-character parameter description.

Note: The cache size parameters are set in bytes, but you can use size units:

K - for kilobyte
M - for megabytes
G - for gigabytes

# DB Settings

In DB section you can set blockchain database parameters.

Name	Description	Default value
`directory`	Sets the location of database file.	`${waves.directory}"/data"` The path is resolved with regard to `directory` parameter from `waves` section.
`store-transactions-by-address`	This parameter allows to store transactions by address in database. If disabled, you will not be able to get information from the node.	`true`
`store-invoke-script-results`	This parameter allows to store state changes in database. If disabled, you will not be able to get the state changes on your node.	`true`
`max-cache-size`	Limits the size of caches which are used during block validation. Lower values slightly decrease memory consumption, while higher values might increase node performance. Setting this value to 0 disables caching.	`100000`
`max-rollback-depth`	By default a node can process rollback to up to 2000 blocks without rebuilding blockchain database. The default limit can be changed with this.	`2000`
`use-bloom-filter`	Enabling bloom filter allows to speed up blockchain import. Should be disabled in normal node operation.	`false`
`store-state-hashes`	This setting enables `/debug/stateHash/{height}` api method	`false`

# Network Settings

In network section you can set P2P network parameters.

Name	Description	Default value
`file`	Sets the location of database file where the node stores lists of known and blacklisted peers.	`${waves.directory}"/peers.dat` By default, the path is resolved with regard to `directory` parameter from `waves` section.
`declared-address`	Sets the IP address and port (`address:port`) that is sent as external address during handshake. • Can be set automatically if UPnP is enabled. If the `declared-address` is not set and UPnP is enabled, the node will attempt to connect to an IGD (Internet Gateway Device), retrieve its external IP address and configure the gateway to allow traffic through. If the node succeeds, the IGD's external IP address becomes the node's `declared-address`. • If the `declared-address` is set and the UPnP is disabled, the node will listen to incoming connections on `bind-address:port` and broadcast specified `declared-address` to peers. • If the `declared-address` is not set and UPnP is disabled, the node will not listen to incoming connections at all. • In some cases, however, this setup is not recommended, you can set `declared-address` and enable UPnP (e.g. when IGD can't reliably determine its external IP address), so that the node attempts to configure an IGD to pass traffic from external port to `bind-address:port`.
`bind-address`	Sets the IP address of local network interface on which Waves Node will accept incoming connections.	By default, node binds to `0.0.0.0` that means that it will listen on all available network adapters.
`port`	Sets the network port number to which other Waves nodes will connect. Check that the port is reachable from outside, otherwise your node will connect to P2P network using only outgoing connections. If this the port is used by other application, your node won’t start.	`6868` for Mainnet `6863` for Testnet `6862` for Stagenet
`node-name`	Sets the name of your node visible to other participants of the P2P network. The name is transmitted during initial handshake.	Generated randomly as `Node-${random-nonce}`
`nonce`	This value is sent during handshake. The value is used to distinguish nodes connected from one IP address.	Generated randomly
`known-peers`	This parameter stores the list of bootstrap nodes to which your node will establish outgoing connections while initializing.	no value
`peers-data-residence-time`	Period of time during which the node stores information about external peer since last communication session with it.	`1d`
`black-list-residence-time`	Period of time for which the information about external peer stays in the blacklist.	`15m`
`break-idle-connections-timeout`	Break a connection if there is no message from the peer during this timeout	`5m`
`max-inbound-connections`	Sets the maximum number of simultaneous inbound connections handled by the node.	`100`
`max-outbound-connections`	Number of maximum outgoing network connections.	`100`
`max-single-host-connections`	Allowed number of network connections made from single IP address.	`3`
`connection-timeout`	Network communication timeout.	`30s`
`max-unverified-peers`	Maximum size of the buffer to store information about peers during handshake process.	`100`
`enable-peers-exchange`	Enables or disables requesting and sending the information about peers.	`yes`
`enable-blacklisting`	Enables or disables blacklisting of peers.	`yes`
`peers-broadcast-interval`	Period of time between broadcasts of known peers list to other nodes.	`2m`
`handshake-timeout`	Time period to wait for reply during handshake. In case of no reply the peer will be blacklisted.	`30s`
`upnp`	This section allows to set the UPnP settings. The settings are useful if your node is running in the network where the node can ask your router (Internet Gateway Device) to establish a tunnel.	By default, this functionality is disabled. To enable set the `enable` parameter to `yes`.
`traffic-logger`	This section allows to enable or disable logging of some of the incoming or outgoing network messages. Network messages are logged at TRACE level.

Note: The time span parameters are set in milliseconds, but you can use duration units to shorten the value. Supported units are:

s - second, seconds
m - minute, minutes
h - hour, hours
d - day, days

For usage examples see the list of default settings (do not copy this file and do not use it as the configuration file for your node).

# Wallet Settings

In wallet section you can configure parameters of the wallet built in Waves node.

Name	Description	Default value
`file`	Sets the path to the wallet file.	By default, the path to the file is calculated relative to the base application directory.
`password`	Sets the password string to protect the wallet file.	"password string"
`seed`	This parameter is used to recreate an existing wallet on a new node. Provide the seed base58-encoded. If you don’t have any existing wallet, comment out this parameter and start the node. During the first run, the application will create a new wallet with a random seed for you. In this case, the seed will be displayed in the application log. If you miss it or if you don’t want to check the log files, it will also be available in REST API using the wallet/seed method.	"seed in BASE58"

Warning: Wallet is a critical part of your node. It is better to create its file in a safe and protected location. Don’t forget to backup your wallet’s file. It’s recommended to remove the seed from the configuration file immediately after the start of the node. If an attacker gains access to the seed string, he will have access to your funds on all your addresses!

# Blockchain Settings

In blockchain section you can select the blockchain type or create your own blockchain.

Name	Description	Default value
`type`	Blockchain type: MAINNET, TESTNET, STAGENET, or CUSTOM. For MAINNET or TESTNET or STAGENET types, parameters of blockchain are built in the application so you don’t have to configure the parameters. See standard parameters for different types of blockchain. But if you select CUSTOM blockchain type, you have to provide parameters in the `custom` configuration section.	TESTNET

# Configuring Custom Blockchain

The custom section allows to set parameters of your custom blockchain.

Name	Description	Default value
`address-scheme-character`	This parameter in `custom` section to set the address feature character. This character used while building an address and also passed over a network during a handshake. The latter allow nodes not to connect to the nodes with other blockchains.
`functionality`	Section of blockchain functionality settings. The main settings are given below, for the others we don't recommend changing the defaults
`genesis`	Section of genesis block parameters, see the description below
`rewards`	Section containing the initial block reward and voting settings for changing it (see the Community-Driven Monetary Policy article)

# Functionality settings

Name	Description	Default value
`feature-check-blocks-period`	Number of blocks in the voting period for a new feature and in the period from feature approval to activation (see the Activation Protocol) article	10000
`blocks-for-feature-activation`	The number of blocks with feature support required for its approval	9000
`max-transaction-time-back-offset`	Allowable time a transaction's timestamp can lag behind the block's timestamp	120m
`max-transaction-time-forward-offset`	Allowable time a transaction's timestamp can be ahead of the block's timestamp	90m
`pre-activated-features`	List of pre-activated features and their activation heights (see the Features article)
`dao-address`, `xtn-buyback-address`	Addresses receiving a share of block reward (for more information on block reward distribution, see the Community Driven Monetary Policy article). If the address (or both) is not specified, the corresponding share of block reward goes to the block generator

# Genesis block parameters

Name	Description	Default value
`block-timestamp`	Sets the date of creation of genesis block.
`timestamp`	Sets time of creation for genesis transactions.
`signature`	Sets the signature of genesis block.
`initial-balance`	This parameter allows to set the total amount of coins. This value should be given in the atomic units of token.
`average-block-delay`	Sets the speed of block generation in your blockchain. This is a target period of time between blocks. In reality the delays between blocks may vary.
`transactions`	This parameter allows to provide the list of first transactions. Each transaction is described by recipient’s address (as BASE58 string) and amount. You have to distribute all initial balance to one or more addresses in genesis block. If you failed to do so, the genesis block will be considered as incorrect and the application won’t start.

# Miner Settings

In miner section it is possible to configure parameters of the new blocks generator.

Name	Description	Default value
`enable`	This parameter enables or disables block generation on the node.	By default, it’s enabled, but if you disable it your node won’t try to generate new blocks (won’t mine).
`quorum`	Sets the minimum required number of connected peers to enable and start mining of new blocks.	By default it is set to 1, so your node will start mining as soon as it connects to the first peer in the P2P network. Setting this parameter to 0 will enable off-line generation.
`interval-after-last-block-then-generation-is-allowed`	This parameter allows to tune your node’s blocks download and generation behavior.	By default, it set to 1 day, which means that your node won’t start block generation until it has the last block in the local blockchain not older than 1 day. So, using this parameter you tell your node to actualize the blockchain before starting to generate new blocks. Actually, it works only after long node shutdowns.
`no-quorum-mining-delay`	Sets mining attempts delay, if no quorum is available	`5s`
`micro-block-interval`	Sets the interval between microblocks	`2s` starting from node version 1.4.7 `5s` up to and including node version 1.4.6
`max-transactions-in-micro-block`	Sets max amount of transactions in micro block	`255`
`min-micro-block-age`	Miner references the best microblock which is at least this age	`2s`
`minimal-block-generation-offset`	Sets minimal block generation offset	`0`
`private-keys`	Private keys used for generating blocks insteads of the main account from the node's wallet

# REST API Settings

The rest-api section in the node configuration file contains settings of Node REST API.

Name	Description	Default value
`enable`	Activates REST API. If you want to deactivate REST API, change the default value to `no`	yes
`bind-address`	Network address where the REST API accepts incoming connections. Note. It's not recommended to change the default value. Use Nginx’s proxy pass module or SSH port forwarding for external access	`"127.0.0.1"`
`port`	Port number where the REST API accepts incoming connections	6869
`api-key-hash`	Hash of the API key to access private endpoints. For details see the API Key article	""
`cors-headers`	Section of CORS settings. See the How to Configure CORS: Support For Cross Domain Requests article for details. For a description of the settings, see below	If the section is omitted, web apps of any domains are allowed to make requests to the node API
`transactions-by-address-limit`	• Maximum `limit` value in a request to `/transactions/address/{address}/limit/{limit}` • Maximum number of transaction IDs in request to `/transactions/status` and `/transactions/merkleProof`	1000
`distribution-address-limit`	Maximum `limit` value in a request to `/assets/{assetId}/distribution/{height}/limit/{limit}`	1000
`data-keys-request-limit`	Maximum number of keys in a request to `/addresses/data/{address}`	1000
`asset-details-limit`	Maximum number of token IDs in a request to `/assets/details` and `/assets/balance/{address}`	100
`blocks-request-limit`	• Maximum range `{from}-{to}` in a request to `/blocks/address/{address}/{from}/{to}`, `/blocks/seq/{start}/{end}`, and `/blocks/headers/seq/{start}/{end}`	100
`evaluate-script-complexity-limit`	Maximum complexity of the input expression in `/utils/script/evaluate/{address}`	52 000
`limited-pool-threads`	Maximum number of threads that process requests to `/utils/script/compile*`, `/utils/script/decompile`, `/utils/script/estimate` (the processing time for each request is limited)	2
`minimum-peers`	Minimum required number of connected peers to accept transactions via gRPC or REST API (`broadcast`). If the number of connected peers is less than the specified number, the node rejects transactions received via the API	1

# CORS Settings

Name	Description	Default value
`access-control-allow-headers`	HTTP headers that can be used during the external request	`[ "Authorization", "Content-Type", "X-Requested-With", "Timestamp", "Signature" ]`
`access-control-allow-origin`	Origin that can access the response from requesting code	`"origin-from-request"`, which means that the `Access-control-allow-origin` HTTP header of the node API response contains the domain specified in the `Origin` header of the request. That way, any domain is allowed by default
`access-control-allow-methods`	Allowed HTTP methods when accessing a resource	`["OPTIONS", "POST", "PUT", "GET", "DELETE"]`
`access-control-allow-credentials`	Enable/disable exposing the response to the frontend JS code when the request's credentials mode is `include`	`yes`

# Synchronization Settings

In synchronization section it is possible to tune different aspects of node synchronization process.

Name	Description	Default value
`max-rollback`	This parameter allows to change the length of blockchain that can be discarded in case of fork detection. If your node is on a fork with a lower score, it will try to switch to another fork, to do so the node will rollback few blocks. If the detected fork is longer than the given number, node prefers not to switch to another fork even if its score is bigger.	`100`
`synchronization-timeout`	Sets the timeout on block download operation.	`60s`
`score-ttl`	Sets the time-to-live interval of broadcasted score packets.	`90s`
`history-replier`	In this subsection you can configure the number of last blocks and micro-blocks cached in memory.
`micro-block-synchronizer`	In this subsection you could tune various parameters of Waves-NG protocol.	`2s`

# UTX Pool Settings

The utx section allows to set unconfirmed transactions pool parameters.

Name	Description	Default value
`max-size`	Sets the size of unconfirmed transactions pool (both scripted and non-scripted).	`100000`
`max-scripted-size`	Sets the size of unconfirmed transactions pool for scripted transactions. Prior to node version 1.1.6, the invoke script transactions were not counted (the counted were the transactions for the validation of which it is required to execute a smart contract).	`5000`
`max-transaction-age`	Sets the maximum age of transactions allowed to UTX.

# Features Settings

The features section allows to set features parameters

Name	Description	Default Value
`auto-shutdown-on-unsupported-feature`	If this parameter is turned on, the node will be shut down on activation of a feature that is not implemented by node’s codebase.	yes
`supported`	This parameter contains the list of features IDs, supported by the node owner.	By default, the list is empty.

Example:

waves {
  ...
  features {
    auto-shutdown-on-unsupported-feature = yes
    supported = [20]
  }
}

# Rewards Settings

In this section, you can set the desired reward size using desired parameter. The setting value is specified in WAVELETs.

If the value is greater than the current reward size, then miner votes for the current reward size increase; if the value is smaller — for the decrease.

Example of the setting that has the desired value of 7 WAVES:

waves {
  ...
  rewards {
    desired = 700000000
  }
}

The value can be any integer in the range from 0 to 9,223,372,036,854,775,807 inclusive. Negative value will be ignored.

See Community-Driven Monetary Policy for more information.