input-output-hk/mantis

---

input-output-hk/mantis.json

{
  "createdAt": "2016-12-12T12:51:31Z",
  "defaultBranch": "develop",
  "description": "A Scala based client for Ethereum-like Blockchains. ",
  "fullName": "input-output-hk/mantis",
  "homepage": "",
  "language": "Scala",
  "name": "mantis",
  "pushedAt": "2021-12-15T14:56:12Z",
  "stargazersCount": 233,
  "topics": [
    "etc",
    "ethereum",
    "scala"
  ],
  "updatedAt": "2025-10-31T10:30:29Z",
  "url": "https://github.com/input-output-hk/mantis"
}

Mantis

Ethereum-like Blockchain Scala client built by IOHK’s for Ethereum Classic (ETC) network

Status - Not maintained

The lastest ETC hard-fork supported by the client is Magneto hard-fork

You can check the latest build results of the current branch by clicking the status icon in the header of the Github file browser.

Download the client

The latest release can be downloaded from here

Command line version

In the bin directory, you can find the generic launcher. To connect to a pre-configured network just pass the network name as a parameter.

Example:

• ./bin/mantis-launcher etc - for joining Ethereum Classic network

Possible networks: etc, eth, mordor, testnet-internal

Command Line Interface

cli is a tool that can be used to:

• generate a new private key

./bin/mantis cli generate-private-key

• derive an address from private key

./bin/mantis cli derive-address 00b11c32957057651d56cd83085ef3b259319057e0e887bd0fdaee657e6f75d0

• generate genesis allocs (using private keys and/or addresses)

`./bin/mantis cli generate-allocs --balance=42 --address=8b196738d90cf3d9fc299e0ec28e15ebdcbb0bdcb281d9d5084182c9c66d5d12 --key=00b11c32957057651d56cd83085ef3b259319057e0e887bd0fdaee657e6f75d1`

• generate multiple key-pairs (following example generate 5 key-pairs)

./bin/mantis cli generate-key-pairs 5

• encrypt private key (default passphrase is empty string)

./bin/mantis cli encrypt-key --passphrase=pass 00b11c32957057651d56cd83085ef3b259319057e0e887bd0fdaee657e6f75d0

The command output uses the same format as the keystore so it could be used ex. to setup private faucet

ex.

{
  "id":"3038d914-c4cd-43b7-9e91-3391ea443f95",
  "address":"c28e15ebdcbb0bdcb281d9d5084182c9c66d5d12",
  "version":3,
  "crypto":{
    "cipher":"aes-128-ctr",
    "ciphertext":"6ecdb74b2a33dc3c016b460dccc96843d9d050aea3df27a3ae5348e85b3adc3e",
    "cipherparams":{
      "iv":"096b6490fe29e42e68e2db902920cad6"
    },
    "kdf":"scrypt",
    "kdfparams":{
      "salt":"cdcc875e116e2824ab02f387210c2f4ad7fd6fa1a4fc791cc92b981e3062a23e",
      "n":262144,
      "r":8,
      "p":1,
      "dklen":32
    },
    "mac":"8388ae431198d31d57e4c17f44335c2f15959b0d08d1145234d82f0d253fa593"
  }
}

Building the client

As an alternative to downloading the client, build the client from source.

With SBT

Prerequisites to build

• JDK 1.8 (download from java.com)
• sbt (download sbt)
• python 2.7.15 (download from python.org)

Build the client

In the root of the project:

git submodule update --recursive --init
sbt dist

This updates all submodules and creates a distribution zip in ~/target/universal/.

Note: building in dev mode allows faster and incremental compilation, for this:

• set environment variable MANTIS_DEV to true, or
• use the system property -DmantisDev=true

With Nix

In the root of the project:

Build the client

nix-build

On a Mac

This project uses Nix for CI, deployment and, optionally, local development. Some of the dependencies are not available for Darwin (macOS) however. To work with Nix on a Mac you can instead use Docker via the nix-in-docker/run script, which will start a nix-shell with the same environment as CI.

Update sbt+nix dependencies

When updating project dependencies, the nix fixed-output-derivation will need to be updated so that it includes the new dependency state.

To do so, please run:

./update-nix.sh
git add ./nix/overlay.nix
git commit -m "Update nix-sbt sha"

For this command to work you’ll need the Flakes feature enabled in your nix environment.

NOTE: This should only be necessary when updating dependencies (For example, edits to build.sbt or project/plugins.sbt will likely need to be regenerated)

Monitoring

Locally build & run monitoring client

A docker-compose setup using Prometheus and Grafana, and a preconfigured dashboard, is available. As a precondition you need to have docker and sbt installed. Before running the script, you need to enable metrics by editing the file metrics.conf and setting mantis.metrics.enabled=true

To build the monitoring, run the following script at ./docker/mantis/build.sh. This script builds a docker image of mantis using the local sources and starts the docker-compose.

Grafana will be available at http://localhost:3000 (using user and password: admin and admin) with a dashboard called Mantis.

TLS setup

Both the JSON RPC (on the node and faucet) can be additionally protected using TLS. The development environment it already properly configured with a development certificate.

Generating a new certificate

If a new certificate is required, create a new keystore with a certificate by running ./tls/gen-cert.sh

Configuring the node

1. Configure the certificate and password file to be used at mantis.network.rpc.http.certificate key on the application.conf file:

   keystore-path: path to the keystore storing the certificates (if generated through our script they are by default located in ”./tls/mantisCA.p12”)

   keystore-type: type of certificate keystore being used (if generated through our script use “pkcs12”)

   password-file: path to the file with the password used for accessing the certificate keystore (if generated through our script they are by default located in ”./tls/password”)

2. Enable TLS in specific config:

   • For JSON RPC: mantis.network.rpc.http.mode=https

Configuring the faucet

1. Configure the certificate and password file to be used at mantis.network.rpc.http.certificate key on the faucet.conf file:

   keystore-path: path to the keystore storing the certificates (if generated through our script they are by default located in ”./tls/mantisCA.p12”)

   keystore-type: type of certificate keystore being used (if generated through our script use “pkcs12”)

   password-file: path to the file with the password used for accessing the certificate keystore (if generated through our script they are by default located in ”./tls/password”)

2. Enable TLS in specific config:

   • For JSON RPC: mantis.network.rpc.http.mode=https

3. Configure the certificate used from RpcClient to connect with the node. Necessary if the node uses http secure. This certificate and password file to be used at faucet.rpc-client.certificate key on the faucet.conf file:

   keystore-path: path to the keystore storing the certificates keystore-type: type of certificate keystore being used (if generated through our script use “pkcs12”) password-file: path to the file with the password used for accessing the certificate keystore

Faucet setup and testing

1. First start a client node using the docker-compose, by running the script found at ./docker/mantis/build.sh Modify the script before running it by adding the volumes and command sections to mantis configuration:

mantis:
image: mantis:latest
ports:
- 8546:8546
- 13798:13798
- 9095:9095
networks:
- mantis-net
volumes:
- $HOME/.mantis:/home/demiourgos728/.mantis/
command: -Dconfig.file=./conf/sagano.conf

2. Create a wallet address. Run the following curl command, replacing <password> by a password of your choice:

curl --request POST \
  --url http://127.0.0.1:8546/ \
  --header 'Cache-Control: no-cache' \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "method": "personal_newAccount",
  "params": ["<password>"],
  "id": 1
}'

You will receive a response like this:

{"jsonrpc":"2.0","result":"<address>","id":1}

3. Modify src/universal/conf/faucet.conf file, config your account address created in the previous step. with the password choosen by you:

wallet-address = "<address>"
wallet-password = "<password>"

4. Now check the keystore folder in ~/.mantis/testnet-internal-nomad/keystore. Inside you will find a key generate with the curl request sent in step 2.. Copy that file to ~/.mantis-faucet/keystore/:

cp UTC--<date>--<key> ~/.mantis-faucet/keystore/

5. Start the faucet in command line:

sbt -Dconfig.file=src/universal/conf/faucet.conf "run faucet"

6. Run the following curl command to send tokens from your faucet to a wallet address:

curl --request POST \
  --url http://127.0.0.1:8099/ \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "method": "faucet_sendFunds",
  "params": ["<address>"],
  "id": 1
}'

Happy transfer!

Note: In order for the transfer transaction be persisted, a faucet needs sufficient founds in its account and in this test case a new faucet, without ETC tokens, is being created.

Feedback

Feedback gratefully received through the Ethereum Classic Forum (http://forum.ethereumclassic.org/)

Known Issues

There is a list of known issues in the ‘RELEASE’ file located in the root of the installation.