Become a Block Producer

(Become an Active Witness)


A Block-Producing Witness

Requirements

  • A registered account in the corresponding network
  • Some funds in the account to pay for the registration fee
  • Executable binary
  • Lifetime Member (LTM) status

Block Producer (Active Witness) Duties

  • Be a reliable blockproducer
  • Maintain a public seednode
  • Publish accurate, frequently updated (check 1-2 times per hour), price feeds for the Smart Coins & Market Pegged Assets

How to become a Block-Producing Witness

Steps

1. Run the Witness/Full Node on the Network

We first run the witness node without block production and connect it to the P2P network with the following command:

$ programs/witness_node/witness_node --rpc-endpoint 127.0.0.1:8090

This command opens a RPC port 8090 for localhost so that we can later connect the CLI wallet with it. After the network was synced and periodically receives new blocks from other participants, we can go on to the next step.

2. Create a CLI Wallet

We now open up the cli_wallet. The following command connects to our plain Witness (Fill) node:

$ programs/cli_wallet/cli_wallet -s ws://127.0.0.1:8090

After launched the wallet successfully, first thing to do is setting up a password for the newly created wallet prior to importing any private keys:

  • set_password:

    new >>> set_password <password>
    set_password <password>
    null
    locked >>>
    
  • unlock:

    locked >>> unlock "<password>"
    unlock "<password>"
    null
    unlocked >>>
    
Wallet creation is now done.

3. Import your Account (and funds) into CLI Wallet

To gain access to Blockchain, we import the account name (owner key) and the balance containing (active key) into the CLI wallet:
  • import_key (owner wifkey), import_key (active wifkey), list_my_accounts , list_account_balances:

    >>> import_key <accountname> <owner wif key>
    true
    >>> import_key <accountname> <active wif key>
    true
    >>> list_my_accounts
    [{
        "id": "1.2.15",
        ...
        "name": <accountname>,
        ...
    ]
    >>> list_account_balances <accountname>
    XXXXXXX BTS
    
Both keys can be exported from the web wallet.

4. Upgrade your Account to a Lifetime Member

  • upgrade_account

Since only lifetime members can become witnesses, you must first upgrade to a lifetime member. This step costs the lifetime-upgrade fee:

>>> upgrade_account <accountname> true
[a transaction in json format]

5. Registering a New Witness (become a witness)

To become a witness and be able to produce blocks, you first need to create a witness object that can be voted in.
  • create_witness:

    >>> create_witness <accountname> "http://<url-to-proposal>" true
    {
      "ref_block_num": 139,
      "ref_block_prefix": 3692461913,
      "relative_expiration": 3,
      "operations": [[
      21,{
        "fee": {
          "amount": 0,
          "asset_id": "1.3.0"
        },
        "witness_account": "1.2.16",
        "url": "url-to-proposal",
        "block_signing_key": "<PUBLIC KEY>",
        "initial_secret": "00000000000000000000000000000000000000000000000000000000"
      }
    ]
      ],
      "signatures": [
          "1f2ad5597af2ac4bf7a50f1eef2db49c9c0f7616718776624c2c09a2dd72a0c53a26e8c2bc928f783624c4632924330fc03f08345c8f40b9790efa2e4157184a37"
      ]
    }
    
Our witness is registered, but it can’t produce blocks because nobody has voted it in. You can see the current list of block producers (active_witnesses) by the following command:
  • get_global_properties:

    >>> get_global_properties
    {
      "active_witnesses": [
    "1.6.0",
    "1.6.1",
    "1.6.2",
    "1.6.3",
    "1.6.4",
    "1.6.5",
    "1.6.7",
    "1.6.8",
    "1.6.9"
      ],
      ...
    

6. Upvote the Witness

Now, we should vote our witness in. Vote all of the shares your account <accountname> in favor of your new witness.
  • vote_for_witness:

    >>> vote_for_witness <accountname> <accountname> true true
    [a transaction in json format]
    

Note

If you want to experiment with things that require voting, be aware that votes are only tallied once per day at the maintenance interval. get_dynamic_global_properties tells us when that will be in next_maintenance_time. Once the next maintenance interval passes, run get_global_properties again and you should see that your new witness has been voted in.

We need to wait until the next maintenance interval until we can see votes casted for our witness.

7. Configuration of the Witness Node

Get the witness object using get_witness and take note of two things.

id:(i.e. witness-id) is displayed in get_global_properties when the witness is voted in, and we will need it on the witness_node command line to produce blocks
signing_key:(i.e. private-key) the public signing_key, we can look up the corresponding private key.
  • get_witness:

    >>> get_witness <accountname>
    {
      [...]
      "id": "1.6.10",
      "signing_key": "GPH7vQ7GmRSJfDHxKdBmWMeDMFENpmHWKn99J457BNApiX1T5TNM8",
      [...]
    }
    
Once we have both values, run dump_private_keys which lists the public-key private-key pairs to find the private key.

Warning

dump_private_keys will display your keys unencrypted on the terminal, don’t do this with someone looking over your shoulder.

  • dump_private_keys:

    >>> dump_private_keys
    [[
      ...
      ],[
    "GPH7vQ7GmRSJfDHxKdBmWMeDMFENpmHWKn99J457BNApiX1T5TNM8",
    "5JGi7DM7J8fSTizZ4D9roNgd8dUc5pirUe9taxYCUUsnvQ4zCaQ"
      ]
    ]
    

Now we need to start the witness, so shut down the wallet (ctrl-d), and shut down the witness (ctrl-c).

Re-launch the witness, now mentioning the new witness 1.6.10 and its keypair:

./witness_node --rpc-endpoint=127.0.0.1:8090 \
               --witness-id '"1.6.10"' \
               --private-key '["GPH7vQ7GmRSJfDHxKdBmWMeDMFENpmHWKn99J457BNApiX1T5TNM8", "5JGi7DM7J8fSTizZ4D9roNgd8dUc5pirUe9taxYCUUsnvQ4zCaQ"]'

Alternatively, you can also add this line into your config.ini:

witness-id = "1.6.10"
private-key = ["GPH7vQ7GmRSJfDHxKdBmWMeDMFENpmHWKn99J457BNApiX1T5TNM8","5JGi7DM7J8fSTizZ4D9roNgd8dUc5pirUe9taxYCUUsnvQ4zCaQ"]

Note

Make sure to use YOUR public/private keys instead of the once given above!

If you monitor the output of the witness_node, you should see it generate blocks signed by your witness:

Witness 1.6.10 production slot has arrived; generating a block now...
Generated block #367 with timestamp 2015-07-05T20:46:30 at time 2015-07-05T20:46:30