Version: Current

Mithril signer node

info

Mithril signer is responsible for producing individual signatures that are collected and aggregated by the Mithril aggregator.

tip

For more information about the Mithril network, please see the architecture overview
For more information about the Mithril signer node, please see this overview
Check out the Run a Mithril signer node guide.

info

The Mithril network configurations are available in the Network configurations section of the user manual.

Resources

Node	Source repository	Rust documentation	Docker packages	Network configurations
Mithril signer	↗️	↗️	↗️	↗️

Prerequisites

Install the latest stable version of the correctly configured Rust toolchain
Install build tools build-essential and m4; for example, on Ubuntu/Debian/Mint, run sudo apt install build-essential m4
Install OpenSSL development libraries; for example, on Ubuntu/Debian/Mint, run apt install libssl-dev.

Download the source file

You can download the source file from GitHub (HTTPS):

git clone https://github.com/input-output-hk/mithril.git

Or (SSH):

git clone git@github.com:input-output-hk/mithril.git

Switch to the desired branch/tag:

# Replace **YOUR_BUILD_BRANCH_OR_TAG** with the appropriate branch or tag name
# Please refer to the [**Network configurations**](http://mithril.network/manual/getting-started/network-configurations) section of the user manual
git checkout **YOUR_BUILD_BRANCH_OR_TAG**

Change the directory:

cd mithril/mithril-signer

Development testing and building

Run tests:

make test

Create the help menu:

make help

Generate the Rust documentation:

make doc

Run in debug mode with the default configuration:

make debug

Release the build and run the binary

To build and run in release mode with the default configuration:

make run

Or, you can build only in release mode:

make build

Display the help menu:

./mithril-signer --help

You should see:

An implementation of a Mithril signer

Usage: mithril-signer [OPTIONS]

Options:
  -r, --run-mode <RUN_MODE>
          Run Mode

          [env: RUN_MODE=]
          [default: dev]

  -v, --verbose...
          Verbosity level, add more v to increase

  -c, --configuration-dir <CONFIGURATION_DIR>
          Directory where the configuration file is located

          [default: ./config]

      --disable-digests-cache
          Disable immutables digests cache

      --reset-digests-cache
          If set the existing immutables digests cache will be reset.

          Will be ignored if set in conjunction with `--disable-digests-cache`.

      --enable-metrics-server
          Enable metrics HTTP server (Prometheus endpoint on /metrics)

          [env: ENABLE_METRICS_SERVER=]

      --metrics-server-ip <METRICS_SERVER_IP>
          Metrics HTTP server IP

          [env: METRICS_SERVER_IP=]
          [default: 0.0.0.0]

      --metrics-server-port <METRICS_SERVER_PORT>
          Metrics HTTP server listening port

          [env: METRICS_SERVER_PORT=]
          [default: 9090]

      --allow-unparsable-block
          If set no error is returned in case of unparsable block and an error log is written instead.

          Will be ignored on (pre)production networks.

  -h, --help
          Print help (see a summary with '-h')

  -V, --version
          Print version

Run in release mode with the default configuration:

./mithril-signer

Run in release mode using a specific mode:

./mithril-signer -r preview

Run in release mode with a custom configuration using environment variables:

NETWORK=**YOUR_CARDANO_NETWORK** AGGREGATOR_ENDPOINT=**YOUR_AGGREGATOR_ENDPOINT** ./mithril-signer

tip

If you wish to delve deeper and access several levels of logs from the Mithril signer, use the following:

Add -v for some logs (WARN)
Add -vv for more logs (INFO)
Add -vvv for even more logs (DEBUG)
Add -vvvv for all logs (TRACE).

Download the pre-built binary

Each Release / Pre-Release distribution comes with pre compiled binaries ready to use or wrapped in a debian package for linux¹.

You can download them from the Release / Pre-Release distribution page that depends on the Mithril Network you are targeting.

These links are available in the Build From column of the above Mithril Networks table.

¹ The Linux binaries target glibc, and have a minimum requirement of glibc 2.31 (compatible with Ubuntu 20.04 or Debian Bullseye).

Build and run a Docker container

Build a local Docker image:

make docker-build

Run a local Docker container:

make docker-run

Configuration parameters

The configuration parameters can be set in either of the following ways:

In a configuration file, depending on the --run-mode parameter. If the runtime mode is testnet, the file is located in ./conf/testnet.json.
The value can be overridden by an environment variable with the parameter name in uppercase.

Here is a list of the available parameters:

Parameter	Command line (long)	Command line (short)	Environment variable	Description	Default value	Example	Mandatory
`verbose`	`--verbose`	`-v`	`VERBOSE`	Verbosity level	-	Parsed from the number of occurrences: `-v` for `Warning`, `-vv` for `Info`, `-vvv` for `Debug` and `-vvvv` for `Trace`	✔️
`run_mode`	`--run-mode`	`-r`	`RUN_MODE`	Runtime mode	`dev`	-	✔️
`cardano_cli_path`	-	-	`CARDANO_CLI_PATH`	Cardano CLI tool path	-	`cardano-cli`	✔️
`cardano_node_socket_path`	-	-	`CARDANO_NODE_SOCKET_PATH`	Path of the socket used by the Cardano CLI tool to communicate with the Cardano node	-	`/tmp/cardano.sock`	✔️
`db_directory`	`--db-directory`	-	`DB_DIRECTORY`	Directory to snapshot from the Cardano node	`/db`	-	✔️
`network`	-	-	`NETWORK`	Cardano network	-	`testnet` or `mainnet` or `devnet`	✔️
`network_magic`	-	-	`NETWORK_MAGIC`	Cardano network magic number (for `testnet` and `devnet`)	-	`1097911063` or `42`	-
`party_id`	-	-	`PARTY_ID`	Party Id of the signer, usually the `Pool Id` of the SPO	-	`pool1pxaqe80sqpde7902er5kf6v0c7y0sv6d5g676766v2h829fvs3x`	Mandatory in `pool Id declaration mode` where the owner is not verified (decommissioned, only available when built with `allow_skip_signer_certification` feature, for test only)
`run_interval`	-	-	`RUN_INTERVAL`	Interval between two runtime cycles in ms	-	`60000`	✔️
`aggregator_endpoint`	-	-	`AGGREGATOR_ENDPOINT`	Aggregator node endpoint	-	`https://aggregator.pre-release-preview.api.mithril.network/aggregator`	✔️
`data_stores_directory`	-	-	`DATA_STORES_DIRECTORY`	Directory to store signer data (stake, protocol initializers, ...)	-	`./mithril-signer/stores`	✔️
`store_retention_limit`	-	-	`STORE_RETENTION_LIMIT`	Maximum number of records in stores. If not set, no limit is set.	-	-	-
`kes_secret_key_path`	-	-	`KES_SECRET_KEY_PATH`	Path to the `Cardano KES secret key` file. Mandatory in `Pool Id certification mode` where the owner is verified (experimental, soon to be stable & preferred mode)	-	-	-
`operational_certificate_path`	-	-	`OPERATIONAL_CERTIFICATE_PATH`	Path to the `Cardano operational certificate` file. Mandatory in `Pool Id certification mode` where the owner is verified (experimental, soon to be stable & preferred mode)	-	-	-
`era_reader_adapter_type`	`--era-reader-adapter-type`	-	`ERA_READER_ADAPTER_TYPE`	Era reader adapter type that can be `cardano-chain`, `file` or `bootstrap`.	`bootstrap`	-	-
`era_reader_adapter_params`	`--era-reader-adapter-params`	-	`ERA_READER_ADAPTER_PARAMS`	Era reader adapter params that is an optional JSON encoded parameters structure that is expected depending on the `era_reader_adapter_type` parameter	-	-	-
`enable_metrics_server`	`--enable-metrics-server`	-	`ENABLE_METRICS_SERVER`	Enable metrics HTTP server (Prometheus endpoint on /metrics)	`false`	-	-
`metrics_server_ip`	`--metrics-server-ip`	-	`METRICS_SERVER_IP`	Metrics HTTP server IP	`0.0.0.0`	-	-
`metrics_server_port`	`--metrics-server-port`	-	`METRICS_SERVER_PORT`	Metrics HTTP server listening port	`9090`	-	-
`allow_unparsable_block`	`--allow-unparsable-block`	-	`ALLOW_UNPARSABLE_BLOCK`	If set no error is returned in case of unparsable block and an error log is written instead. Will be ignored on (pre)production networks.	`false`	-	-
`enable_transaction_pruning`	-	-	`ENABLE_TRANSACTION_PRUNING`	If set, the signer will prune the cardano transactions in database older than the [network_security_parameter]
`network_security_parameter`	-	-	`NETWORK_SECURITY_PARAMETER`	Also known as `k`, it defines the number of blocks that are required for the blockchain to be considered final, preventing any further rollback `[default: 2160]`.	`2160`	-	-
`preload_security_parameter`	-	-	`PRELOAD_SECURITY_PARAMETER`	Blocks offset, from the tip of the chain, to exclude during the cardano transactions preload `[default: 3000]`.	`3000`	-	-
`transactions_import_block_chunk_size`	-	-	`TRANSACTIONS_IMPORT_BLOCK_CHUNK_SIZE`	Chunk size for importing transactions, combined with transaction pruning it reduces the storage footprint of the signer by reducing the number of transactions stored on disk at any given time.	`1500`	-	-
`cardano_transactions_block_streamer_max_roll_forwards_per_poll`	-	-	`CARDANO_TRANSACTIONS_BLOCK_STREAMER_MAX_ROLL_FORWARDS_PER_POLL`	The maximum number of roll forwards during a poll of the block streamer when importing transactions.	`1000`	-	-
`preloading_refresh_interval_in_seconds`	`--preloading-refresh-interval-in-seconds`	-	`PRELOADING_REFRESH_INTERVAL_IN_SECONDS`	The preloading refresh interval in seconds.	`7200`	-	-

Resources​

Prerequisites​

Download the source file​

Development testing and building​

Release the build and run the binary​

Download the pre-built binary​

Build and run a Docker container​

Configuration parameters​