Running a PoL Watchtower

Steps to run a PoL Watchtower multi-client

The PoL Watchtower is a node in the infinity watch that participates in the PoL (Proof-of-Location) protocol and measures the location claims made by a prover. It can also act as a Prover to prove it's own location claim when challenged.

Witness Chain AVS mainnet Upgrade notes

Prerequisites

Before you begin, ensure you have the following

Running your Watchtower client

Key Points to consider before proceeding...

  1. We have 2 sets of keys - Operator Key and Watchtower Key.

    1. Operator Key is your EigenLayer Operator Key that you have been using with various AVSes including our Witness Chain AVS. Continue to use that here too. This key is used for registering the Watchtower Key(s).

    2. Watchtower Key - This is the signing key for the PoL Watchtower Client. Create a new Key for the same. Don't reuse the Operator Key for the Watchtower Key. It has to be a ECDSA Key.

  2. You are encouraged to setup as many unique watchtowers as you can support (ideally 1 per region of your infrastructure operating). All of the should be registered with the same operator key in the process described in this doc.

  3. Ports to be opened if using public IP:

Incoming ports to be opened (TCP & UDP ):

11112
22223
33334
33335
33336
44445
44446
44447
55556

Outgoing ports: Allow all

0. Creating the Watchtower Key

  1. Create a ECDSA private key using Metamask or other utilities that will be used as Watchtower Key.

  2. Store the watchtower's private key in the file (Make sure you keep track of the file name and its location, as it would be refered later)

echo "YOUR_WATCHTOWER_PRIVATE_KEY" > my_watchtower_private.key

Setting up the watchtower

  1. Prepare a environment file watchtower.env with the following entries as example shown below:

latitude=37.01511676489697
longitude=-79.0392271449855
radius=1000
privateKey=<my_super_secret_watchtower_private_key>
walletPublicKey=<my_open_operator_public_address>
keyType=ethereum
saveResultsInDatabase=false
submitResultsToContract=false
rpcUrl=https://rpc.witnesschain.com
projectName=eigenlayer-<my_operator_name>

Latitude and Longitude are optional. If not provided, they will be automatically determined based on the approximate location of the IP address. However it's recommended to be set for better accuracy.

Explanation:

  • 
        "latitude": 37.015, // Latitude of the machine running the watchtower client
        "longitude": -79.039, // Longitude of the machine running the watchtower client
        "radius": 1000 // Optional. Accuracy in km
    
  • privateKey is your PoL signing key (Watchtower Key)

  • walletPublicKey is the wallet addresses where your contributions go (Operator address)

  • havePublicIPv4Address (and havePublicIPv6Address) set them to true if you have a public IPv4 (or IPv6)

  • havePrivateIPv4Address (and havePrivateIPv6Address) set them to true if you want to force the use of private IP

  • saveResultsInDatabase saves the login, session, and challenge related data in a .sqlite file within the container

  • projectName is the tagging mechanism to ensure we can identify our operators. It is a required field in the format eigenlayer-<your operator name>

We collect various telemetry data from your node, such as the logs etc. You can choose to opt-out by setting TELEMETRY=false in the watchtower.env file

  1. Once you have the config.json ready, the watchtower client can be started with

docker run -d \
  --network=host \
  --name pol-watchtower \
  --env-file ./watchtower.env \
  witnesschain/infinity-watch:1.0.2

you can verify that the watchtower is running by looking at the container status

docker ps 

Explanation:

  1. docker run -d: Runs the container in detached mode (in the background).

    • --network=host
      Uses the host's network stack.
    • --name pol-watchtower
      Names the container as 'pol-watchtower'.
    • witnesschain/infinity-watch:1.0.2: The name of the Docker image to run.

Post Setup

Once the setting up and registration is successful, you can check the logs from the watchtower client ready for challenges. (docker logs -f pol-watchtower). Congratulations, you are now a part of our Watchtower family!

Troubleshooting

As the only prerequisite is docker, make sure you are running atleast version 23.0.0 or above for the commands mentioned in the doc to work. The days might be rainy or snowy, but we've got umbrellas and sweaters! Join our Discord or Telegram—we're happy to help. :D

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