Cold Wallet Deployment

⚠️ Prerequisites

🚧 Before you begin, ensure that each air-gapped machine has the following installed:

• openssl
• docker
• docker compose plugin

You will receive a cold wallet bundle via a presigned URL pointing to an S3 location.

You should follow the link and accept the file download for cold-wallet.tar.gz, and transfer it to a memory stick so that it can be moved onto one more air-gapped machine (no internet).

After transferring the bundle, you can proceed with one of the setup options below.

Option 1. Easy Setup (Single Machine Configuration)

Use this setup if you want to run both cold wallet nodes on the same air-gapped machine.

Step 1: Unpack the Bundle

Once transferred, the admin of each cold wallet node machine should unpack the cold wallet bundle using the following command:

tar -xvf cold-wallet.tar.gz

Step 2: Load Docker Images

Load the cold wallet container:

docker load -i coldwallet.docker

Run the following command to load the container for the provided Redis broker:

docker load -i redis.docker

Step 3: Configure Cold Wallet Nodes

Each node admin should update their node’s configuration file (node0.yaml andnode1.yaml):

1. Generate a key pair for each node:

openssl genpkey -algorithm ed25519 -out node-private.pem
openssl pkey -in node-private.pem -pubout -out node-public.pem

2. This will generate a .pem file for each of the nodes' private and public keys, which should be used to fill in the placeholders:

3. all_public_keys → Fill in node 1 and node 2's public keys

4. our_private_key → This node’s private key

5. ers_public_key → Your Emergency Recovery System (ERS) public key.

cors:
  allow_origins:
    - "http://localhost:3001"
mode: "node"
node:
  broker:
    all_public_keys:
      0: "MCowBQYDK2VwAyEA9VgI4Nwgmk6qhAsE0JA66L64fwGTDx+SeGMIzux1uqQ="
      1: "MCowBQYDK2VwAyEA9GkEqVnQdWq0FxaTJ7g8WrZnS37xuSG+5KWysZAsL24="
    our_private_key: "MC4CAQAwBQYDK2VwBCIEIMvWGmaSMohWCV8x8s/KsuzBcNFIvwt+TZIxRArO5BrU"
    redis:
      connect_timeout: "30s"
      expire_keys: true
      max_message_receivers: 20
      max_sessions: 50
      receive_batch_size: 10
      send_batch_size: 10
      session_timeout: "10m"
      url: "redis://cold_wallet_broker_<redacted>:6379/0"
  database:
    backup_dir: "./db-backup"
    dir: "./db"
    key: "izwghq0i<redacted>"
  ers_public_key: "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"
  node_index: 0
  presignature_counts:
    ecdsa_secp256k1: 1000
    eddsa_ed25519: 1000
port: 8900

❗️ Include only the key values, not the header or footer lines in the .pem files

Step 4: Start the Cold Wallet

After completing the configuration, start the cold wallet:

docker compose up

Option 2. Secure Setup (Multi-Machine Configuration)

Use this setup for a more secure, multi-party computation (MPC) configuration with two separate air-gapped machines.

Step 1: Unpack the bundle

On each air-gapped machine, unpack the cold wallet bundle using the following command:

tar -xvf cold-wallet.tar.gz

Step 2: Load Cold Wallet Image

Load the cold wallet container with the following command:

docker load -i coldwallet.docker

Step 3: Configure Node

Each node admin should update their node’s configuration file (node0.yaml ornode1.yaml):

1. Each node admin should generate a key pair for their cold wallet node using the following commands:

openssl genpkey -algorithm ed25519 -out node-private.pem
openssl pkey -in node-private.pem -pubout -out node-public.pem

2. Use the generated keys to populate the relevant placeholders in your configuration file.
3. all_public_keys → Fill in node 1 and node 2's public keys
4. our_private_key → This node’s private key
5. ers_public_key → Your Emergency Recovery System (ERS) public key.

❗️ Share your public key only with the other node admin so they can include it in their configuration. Never share your private key.

Step 4: Redis Broker Setup

If using the provided Redis broker

One of the node admins should run the broker on their machine. To load the image for the Redis broker, run the following command:

docker load -i redis.docker

If using an existing Redis OSS standard broker

The node admins should modify the docker-compose.yml:

• Remove the entire of cold_wallet_broker_redis component.
• Remove depends_on from the other components.
• Update the Redis configuration in both node0.yaml and node1.yaml to match your broker setup.

Step 5: Update docker-compose.yml per Machine

Update each machine’s docker-compose.yml to include only the components that it should run.

Step 6: Start the Cold Wallet

Start Docker Compose on both machines.

docker compose up