> hyperconnect the world _

ICON is a scalable smart contract enabled blockchain platform with a long-term goal of interoperability between enterprise and public blockchains. Our goal is to Hyperconnect the World, and by combining groundbreaking technology, a strong community, and relentless growth strategies we believe this goal is reachable.

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Becoming a Public Representative (P-Rep)

P-Reps are the consensus nodes that produce, verify blocks and participate in network policy decisions on the ICON Network. To register and become a P-Rep will consist of the following three steps,

1. Install P-Rep tools (CLI for on-chain P-Rep operations)

2. Register as a P-Rep via P-Rep tools

3. Build MainNet P-Rep node

1. Install P-Rep Tools

Quick Install

$ virtualenv venv -p python3    # Create a python 3.6.5+ virtual environment.
$ source venv/bin/activate        # Enter the virtual environment.
(venv) $ pip install preptools

Manual Install

For manual installation and P-Rep tool commands, see full documentation

2. Register via P-Rep Tools

(Registration fee is 2,000 ICX)

There are three ways supply P-Rep registration info to P-Rep Tools; using a json configuration file, using optional arguments, or using interactive command line.

(venv) $ cat registerPRep.json
    "name": "banana node",
    "country": "USA",
    "city": "New York",
    "email": "[email protected]",
    "website": "https://icon.banana.com",
    "details": "https://icon.banana.com/json",
    "p2pEndpoint": "node.example.com:7100"

# Using json file
(venv) $ preptools registerPRep --prep-json registerPRep.json -k keystore

# Using optional argument and interactive command line
(venv) $ preptools registerPRep -k keystore --name "kokoa node" --email "[email protected]"
> Password: 
 > country : USA
 > city : New York
 > website : https://icon.kokoa.com
 > details : https://icon.kokoa.com/json/details.json
 > p2pEndpoint : node.example.com:7100

[Request] ======================================================================
    "from_": "hxef73db5d0ad02eb1fadb37d0041be96bfa56d4e6",
    "to": "cx0000000000000000000000000000000000000000",
    "value": 2000000000000000000000,
    "step_limit": 268435456,
    "nid": 3,
    "nonce": null,
    "version": 3,
    "timestamp": null,
    "method": "registerPRep",
    "data_type": "call",
    "params": {
        "name": "kokoa node",
        "email": "[email protected]",
        "country": "USA",
        "city": "New York",
        "website": "https://icon.kokoa.com",
        "details": "https://icon.kokoa.com/json/details.json",
        "p2pEndpoint": "node.example.com:7100"

See registerPRep command details

The "details" parameter is an external json file that holds additional information about the P-Rep. We strongly recommend that you register this information. Example,

    "representative": {
        "logo": {
            "logo_256": "https://icon.foundation/img/img-256.png",
            "logo_1024": "https://icon.foundation/img/img-1024.png",
            "logo_svg": "https://icon.foundation/img/img-logo.svg"
        "media": {
            "steemit": "",
            "twitter": "",
            "youtube": "",
            "facebook": "",
            "github": "",
            "reddit": "",
            "keybase": "",
              "telegram": "",
            "wechat": ""
  },  "server": {
        "location": {
            "country": "",
            "city": ""
        "server_type": "",
        "api_endpoint": ""

3. Build MainNet P-Rep Node

Examples using Ubuntu 16.04+


The specifications below are recommended for main P-Reps (top 22). Sub P-Reps (outside of top 22) can run lower-end specs as they do not produce/validate blocks but only serve as citizen nodes. Current blockchain size is 153G as of this update (2020/3/17).


DescriptionMinimum SpecificationsRecommended Specifications
CPU modelIntel(R) Xeon(R) CPU @ 3.00GHzIntel(R) Xeon(R) CPU @ 3.00GHz
vCPU (core)1636


OS Requirement

  • Linux (CentOS 7 or Ubuntu 16.04+)

Open Ports

  • TCP 7100: gRPC port used for peer-to-peer connection between peer nodes.
  • TCP 9000: JSON-RPC or RESTful API port serving application requests.

3.1 Install Docker

Docker 18.x+

## Update the apt package index:
$ sudo apt-get update

## Install necessary packages:
$ sudo apt-get install  -y systemd apt-transport-https ca-certificates curl gnupg-agent software-properties-common 

## Add Docker's official GPG key:
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

## Add the apt repository
$ add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

## Update the apt package index:
$ sudo apt-get update

## Install docker-ce:
$ sudo apt-get -y install docker-ce docker-ce-cli containerd.io

## Add your user to the docker group with the following command.
$ sudo usermod -aG docker $(whoami)

## Set Docker to start automatically at boot time:
$ sudo systemctl enable docker.service

## Finally, start the Docker service:
$ sudo systemctl start docker.service

## Then we'll verify docker is installed successfully by checking the version:
$ docker version

3.2 Install Docker Compose

## Install python-pip
$ sudo apt-get install -y python-pip

## Then install Docker Compose:
$ sudo pip install docker-compose

## To verify the successful Docker Compose installation, run:
$ docker-compose version

3.3 Running a P-Rep Node Container using docker-compose

Create a file named docker-compose.yml in a text editor and add the following content:

version: "3"
     image: "iconloop/prep-node"
     container_name: "prep-mainnet"
     network_mode: host     
     restart: "always"
        NETWORK_ENV: "mainnet"
        LOG_OUTPUT_TYPE: "file"
        SWITCH_BH_VERSION3: "10324749"
        CERT_PATH: "/cert"
        ICON_LOG_LEVEL: "DEBUG"        
        FASTEST_START: "yes" # Restore from lastest snapshot DB
        - SYS_TIME      
        - ./data:/data # mount a data volumes
        - ./cert:/cert # Automatically generate cert key files here
        - 9000:9000
        - 7100:7100

Run docker-compose

$ docker-compose up -d

The parameter provided FASTEST_START: "yes" will download the latest full-hour blockchain snapshot, and the remaining blocks will be synchronized automatically. You can check server status and current block height via this API: http://{YOUR_NODE_IP}:9000/api/v1/status/peer.

Citizen Node

Citizen nodes are non-producing nodes on the ICON network. A non-producing node is a node that is not configured to produce blocks, instead it is constantly synchronizing the latest blocks from the network and can be used for on-chain queries. Citizen nodes DO NOT require registration.

ICON node software is identical for P-Rep nodes and Citizen nodes, one can follow the same procedures to set up a P-Rep node, without registration, to operate a Citizen node.

Experiment on TestNet

TestNet Pagoda is available for node operation testing, you can experiment with this docker-compose template.

Pagoda Network Information

API endpointhttps://zicon.net.solidwallet.io/api/v3
Network ID (nid)80
Transaction feeon
SCORE auditon

To receive test ICX, please send email to [email protected] with the following information.

  • Testnet node URL
  • Address to receive the testnet ICX. Address should start with hx followed by a 20-byte string.

Having Trouble?

For troubleshoots and other questions, please join ICON P-Rep MainNet or ICON P-Rep TestNet Telegram Channels.

Updated 9 months ago


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