# Join the Cosmos Hub Mainnet
See the launch repo for information on the mainnet, including the correct version of the Cosmos-SDK to use and details about the genesis file.
You need to install gaia before you go further
# Setting Up a New Node
These instructions are for setting up a brand new full node from scratch.
First, initialize the node and create the necessary config files:
Monikers can contain only ASCII characters. Using Unicode characters will render your node unreachable.
You can edit this
moniker later, in the
You can edit the
~/.gaiad/config/app.toml file in order to enable the anti spam mechanism and reject incoming transactions with less than the minimum gas prices:
Your full node has been initialized!
# Genesis & Seeds
# Copy the Genesis File
Fetch the mainnet's
genesis.json file into
gaiad's config directory.
Note we use the
latest directory in the launch repo which contains details for the mainnet like the latest version and the genesis file.
If you want to connect to the public testnet instead, click here
To verify the correctness of the configuration run:
# Add Seed Nodes
Your node needs to know how to find peers. You'll need to add healthy seed nodes to
launch repo contains links to some seed nodes.
If those seeds aren't working, you can find more seeds and persistent peers on a Cosmos Hub explorer (a list can be found on the launch page).
You can also ask for peers on the Validators Riot Room
For more information on seeds and peers, you can read this.
# A Note on Gas and Fees
On Cosmos Hub mainnet, the accepted denom is
1atom = 1.000.000uatom
Transactions on the Cosmos Hub network need to include a transaction fee in order to be processed. This fee pays for the gas required to run the transaction. The formula is the following:
gas is dependent on the transaction. Different transaction require different amount of
gas amount for a transaction is calculated as it is being processed, but there is a way to estimate it beforehand by using the
auto value for the
gas flag. Of course, this only gives an estimate. You can adjust this estimate with the flag
1.0) if you want to be sure you provide enough
gas for the transaction.
gasPrice is the price of each unit of
gas. Each validator sets a
min-gas-price value, and will only include transactions that have a
gasPrice greater than their
fees are the product of
gasPrice. As a user, you have to input 2 out of 3. The higher the
fees, the higher the chance that your transaction will get included in a block.
For mainnet, the recommended
Your full-node keeps unconfirmed transactions in its mempool. In order to protect it from spam, it is better to set a
minimum-gas-prices that the transaction must meet in order to be accepted in your node's mempool. This parameter can be set in the following file
The initial recommended
0.025uatom, but you might want to change it later.
# Pruning of State
There are three strategies for pruning state, please be aware that this is only for state and not for block storage:
PruneEverything: This means that all saved states will be pruned other than the current.
PruneNothing: This means that all state will be saved and nothing will be deleted.
PruneSyncable: This means that only the state of the last 100 and every 10,000th blocks will be saved.
By default every node is in
PruneSyncable mode. If you would like to change your nodes pruning strategy then you must do so when the node is initialized. For example, if you would like to change your node to the
PruneEverything mode then you can pass the
---pruning everything flag when you call
Note: When you are pruning state you will not be able to query the heights that are not in your store.
# Run a Full Node
Start the full node with this command:
Check that everything is running smoothly:
View the status of the network with the Cosmos Explorer.
# Export State
Gaia can dump the entire application state to a JSON file, which could be useful for manual analysis and can also be used as the genesis file of a new network.
Export state with:
You can also export state from a particular height (at the end of processing the block of that height):
If you plan to start a new network from the exported state, export with the
# Verify Mainnet
Help to prevent a catastrophe by running invariants on each block on your full node. In essence, by running invariants you ensure that the state of mainnet is the correct expected state. One vital invariant check is that no atoms are being created or destroyed outside of expected protocol, however there are many other invariant checks each unique to their respective module. Because invariant checks are computationally expensive, they are not enabled by default. To run a node with these checks start your node with the assert-invariants-blockly flag:
If an invariant is broken on your node, your node will panic and prompt you to send a transaction which will halt mainnet. For example the provided message may look like:
When submitting a invariant-broken transaction, transaction fee tokens are not deducted as the blockchain will halt (aka. this is a free transaction).
# Upgrade to Validator Node
You now have an active full node. What's the next step? You can upgrade your full node to become a Cosmos Validator. The top 125 validators have the ability to propose new blocks to the Cosmos Hub. Continue onto the Validator Setup.