Croeseid Testnet: Running Nodes

The latest Cronos PoS Chain Testnet has been named as Croeseid.

This is detailed documentation for setting up a Validator or a full node on Croeseid testnet testnet-croeseid-4.


Supported OS

We officially support macOS, Windows and Linux only. Other platforms may work but there is no guarantee. We will extend our support to other platforms after we have stabilized our current architecture.

Prepare your machine

  • To run Cronos PoS Chain nodes in the testnet, you will need a machine with the following minimum requirements to run different types of nodes:

Archive Node (setting pruning = nothing)

  • RAM: 16GB (goleveldb)

  • Disk: 281GB

  • CPU: 4 cores

Default Full Node (setting pruning = default)

  • RAM 16GB (goleveldb)

  • Disk: 83GB (Depends on how long the node is running for)

  • CPU: 4 cores

Step 0: Notes on network upgrades

For those that would like to build a Run a Full Node with complete blockchain data from scratch, note that there were several breaking network upgrades, requiring upgrading at designated block heights below:

Block heightBinary VersionInstruction

1 - 8,302,700


Start with this version.



When it reaches the target block height 8,302,700 update the binary and restart

IMPORTANT: If you are not able to perform this upgrades, you can also reqeust a testnet archive snapshot from us

Step 1. Get the Cronos PoS Chain testnet binary

Remarks: The following is the minimal setup for a validator node.

Reminder: The binary for testnet and the binary for mainnet are two different binaries. Please make sure you are using the correct binary.

To simplify the following step, we will be using Linux (Intel x86) for illustration. Binary for Mac (Intel x86 / M1)and Windows are also available.

  • To install Cronos PoS Chain released testnet binaries from GitHub:

    $ curl -LOJ
    $ tar -zxvf chain-main_3.1.0-croeseid_Linux_x86_64.tar.gz
  • You can verify the installation by checking the version of the chain-maind, the current version is 3.1.0-croeseid.

Reminder: For macOS users: the binary is not signed, you have to follow the steps here to make the binary runnable.

$./chain-maind version

Step 2. Configure chain-maind

Before kick-starting your node, we will have to configure your node so that it connects to the Croeseid testnet:

Step 2-0 (Optional) Clean up the old blockchain data

  • If you have joined testnet-croeseid-3 before, you would have to clean up the old blockchain data and start over again, it can be done by running:

    $ ./chain-maind unsafe-reset-all

    and remove the old Genesis file by

    $ rm ~/.chain-maind/config/genesis.json
  • You can not override the previous validator through chain-maind init. If you want to have a new validator, you need to manually remove the priv_validator_key.json:

    rm ~/.chain-maind/config/priv_validator_key.json

    Then, in Step 2-1, chain-maind init should help you to generate a new validator key file.

Step 2-1 Initialize chain-maind

  • First of all, you can initialize chain-maind by:

      $ ./chain-maind init [moniker] --chain-id testnet-croeseid-4

    This moniker will be the displayed ID of your node when connected to Cronos PoS Chain network. When providing the moniker value, make sure you drop the square brackets since they are not needed. The example below shows how to initialize a node named pegasus-node :

      $ ./chain-maind init pegasus-node --chain-id testnet-croeseid-4


    • Depending on your chain-maind home setting, the chain-maind configuration will be initialized to that home directory. To simply the following steps, we will use the default chain-maind home directory ~/.chain-maind/ for illustration.

    • You can also put the chain-maind to your binary path and run it by chain-maind

Step 2-2 Configure chain-maind

  • Download and replace the Croeseid Testnet genesis.json by:

    $ curl > ~/.chain-maind/config/genesis.json
  • Verify sha256sum checksum of the downloaded genesis.json. You should see OK! if the sha256sum checksum matches.

    $ if [[ $(sha256sum ~/.chain-maind/config/genesis.json | awk '{print $1}') = "cf20fb923be3bc565e49a57e81a47ca969e8a973be7b3ed44e2734e369118b6c" ]]; then echo "OK"; else echo "MISMATCHED"; fi;


    • For Mac environment, sha256sum was not installed by default. In this case, you may setup sha256sum with this command:

      function sha256sum() { shasum -a 256 "$@" ; } && export -f sha256sum
  • In ~/.chain-maind/config/app.toml, update minimum gas price to avoid transaction spamming

    $ sed -i.bak -E 's#^(minimum-gas-prices[[:space:]]+=[[:space:]]+)""$#\1"0.025basetcro"#' ~/.chain-maind/config/app.toml
  • For network configuration, in ~/.chain-maind/config/config.toml, please modify the configurations of persistent_peers, create_empty_blocks_interval and timeout_commit by:

    $ sed -i.bak -E 's#^(persistent_peers[[:space:]]+=[[:space:]]+).*$#\1"71d2a4727bf574d5d368c343e37edff00cd556b1@,8af7c92277f3edce58aa828cf1026cfa74fd6569@"#' ~/.chain-maind/config/config.toml
    $ sed -i.bak -E 's#^(create_empty_blocks_interval[[:space:]]+=[[:space:]]+).*$#\1"5s"#' ~/.chain-maind/config/config.toml
    $ sed -i.bak -E 's#^(timeout_commit[[:space:]]+=[[:space:]]+).*$#\1"2s"#' ~/.chain-maind/config/config.toml  

Note: We suggest using persistent_peers instead of seeds for a stable state-sync experience.

Step 2-3 Enable STATE-SYNC

STATE-SYNC is supported in our testnet! 🎉

With state sync your node will download data related to the head or near the head of the chain and verify the data. This leads to drastically shorter times for joining a network for validators.

However, you should keep in mind that the block before state-sync trust height will not be queryable. So if you want to run a full node, better not use state-sync feature to ensure your node has every data on the blockchain network.

For validator, it will be amazingly fast to sync the near head of the chain and join the network.

Follow the below optional steps to enable state-sync.

  • For state-sync configuration, in ~/.chain-maind/config/config.toml, please modify the configurations of [statesync] enable, rpc_servers, trust_height and trust_hash by:

    $ LATEST_HEIGHT=$(curl -s | jq -r .result.block.header.height); \
    TRUST_HASH=$(curl -s "$BLOCK_HEIGHT" | jq -r .result.block_id.hash)
    $ sed -i.bak -E "s|^(enable[[:space:]]+=[[:space:]]+).*$|\1true| ; \
    s|^(rpc_servers[[:space:]]+=[[:space:]]+).*$|\1\",\"| ; \
    s|^(trust_height[[:space:]]+=[[:space:]]+).*$|\1$BLOCK_HEIGHT| ; \
    s|^(trust_hash[[:space:]]+=[[:space:]]+).*$|\1\"$TRUST_HASH\"| ; \
    s|^(seeds[[:space:]]+=[[:space:]]+).*$|\1\"\"|" ~/.chain-maind/config/config.toml


    • For Mac environment, if jq is missing, you may install it by: brew install jq

Step 3. Run everything


This page only shows the minimal setup for a validator node.

Furthermore, you may want to run full nodes as sentries (see Tendermint), restrict your validator connections to only connect to your full nodes, test secure storage of validator keys etc.

Step 3-1. Create a new key and address

Run the following to create a new key. For example, you can create a key with the name Default by:

  $ ./chain-maind keys add Default

You should obtain an address with tcro prefix, e.g. tcro1quw5r22pxy8znjtdkgqc65atrm3x5hg6vycm5n. This will be the address for performing transactions.

Step 3-2. Obtain test token

Unless you have obtained the CRO testnet token before, use the tcro faucet to obtain test CRO tokens. In case you have reached the daily limit on faucet airdrop, you can simply send a message on Discord #request-tcro channel, stating who you are and your tcro..... address.

Step 3-3. Obtain the validator public key

You can obtain your validator public key by:

  $ ./chain-maind tendermint show-validator

be The public key should in a json format, for example:

  "@type": "/cosmos.crypto.ed25519.PubKey",
  "key": "[The_validator_key]"

Step 3-4. Run everything

Once the chain-maind has been configured, we are ready to start the node and sync the blockchain data:

  • Start chain-maind, e.g.:

  $ ./chain-maind start

Remarks: If you see errors saying too many files opened..., then you need to set a higher number for maximum open file descriptors in your OS.

If you are on OSX or Linux, then the following could be useful:

# Check current max fd
$ ulimit -n
# Set a new max fd
# Example
$ ulimit -Sn 4096 
  • (Optional for Linux) Start chain-maind with systemd service, e.g.:

  $ git clone && cd chain-main
  $ ./networks/
  $ sudo systemctl start chain-maind
  # view log
  $ journalctl -u chain-maind -f

Example: /etc/systemd/system/chain-maind.service created by script

# /etc/systemd/system/chain-maind.service

ExecStart=/usr/local/bin/chain-maind start --home /home/ubuntu/.chain-maind


It should begin fetching blocks from the other peers. Please wait until it is fully synced before moving onto the next step.

  • You can query the node syncing status by

    $ ./chain-maind status 2>&1 | jq '.SyncInfo.catching_up'

    If the above command returns false, It means that your node is fully synced; otherwise, it returns true and implies your node is still catching up.

  • One can check the current block height by querying the public full node by:

    curl -s | jq "{height: .result.signed_header.header.height}"

    and you can check your node's progress (in terms of block height) by

    $ ./chain-maind status 2>&1 | jq '.SyncInfo.latest_block_height'

Step 3-5. Send a create-validator transaction

Once the node is fully synced, we are now ready to send a create-validator transaction and join the network, for example:

$ ./chain-maind tx staking create-validator \
--from=[name_of_your_key] \
--amount=500000tcro \
--pubkey='{"@type":"/cosmos.crypto.ed25519.PubKey","key":"PUBLIC_KEY"}'  \
--security-contact="[security contact email/contact method]" \
--chain-id="testnet-croeseid-4" \
--commission-rate="0.10" \
--commission-max-rate="0.20" \
--commission-max-change-rate="0.01" \
--min-self-delegation="1" \
--gas 80000000 \
--gas-prices 0.1basetcro

confirm transaction before signing and broadcasting [y/N]: y

You will be required to insert the following:

  • --from: The trco... address that holds your funds;

  • --pubkey: The validator public key( See Step 3-3 above );

  • --moniker: A moniker (name) for your validator node;

  • --security-contact: Security contact email/contact method.

Step 3-6. Check your validator status

Once the create-validator transaction completes, you can check if your validator has been added to the validator set:

$ ./chain-maind tendermint show-address
## [tcrocnclcons... address] ##
$ ./chain-maind query tendermint-validator-set | grep -c [tcrocnclcons...]
## 1 = Yes; 0 = Not yet added ##

To further check if the validator is signing blocks, kindly run this script, for example:

$ curl -sSL | bash -s -- \
--tendermint-url \
--pubkey $(cat ~/.chain-maind/config/priv_validator_key.json | jq -r '.pub_key.value')

The validator is in the active validator set under the address  <YOUR_VALIDATOR_ADDRESS>
The validator is signing @ Block#<BLOCK_HEIGHT> 👍
$ curl -sSL | bash -s -- \
--tendermint-url \
--bechpubkey [tcrocnclconspub1....]

The validator is in the active validator set under the address  <YOUR_VALIDATOR_ADDRESS>
The validator is signing @ Block#<BLOCK_HEIGHT> 👍

Alternatively, you can run it on this browser based IDE, by specifying your validator public key in the "YOUR_PUBKEY" field, where this key can be obtained by running

$ cat ~/.chain-maind/config/priv_validator_key.json | jq -r '.pub_key.value'

Step 4. Perform Transactions

Step 4-1. query bank balances - Check your transferable balance

You can check your transferable balance with the balances command under the bank module.

Example: Check your address balance

$ ./chain-maind query bank balances tcro1quw5r22pxy8znjtdkgqc65atrm3x5hg6vycm5n

- amount: "10005471622381693"
  denom: basetcro
  next_key: null
  total: "0"

Step 4-2. tx bank send - Transfer operation

Transfer operation involves the transfer of tokens between two addresses.

Send Funds [tx bank send <from_key_or_address> <to_address> <amount> <network_id>]

Example: Send 10tcro from one address to another.

$ ./chain-maind tx bank send Default tcro1j7pej8kplem4wt50p4hfvndhuw5jprxxn5625q 10tcro --chain-id "testnet-croeseid-4" --gas-prices 0.1basetcro
  ## Transaction payload##
confirm transaction before signing and broadcasting [y/N]: y

Step 4-3. tx staking - Staking operations


  • To get the 'validator-addr' with bech32 prefix, you can run this command:

    ./chain-maind keys show Default --bech val

Staking operations involve the interaction between an address and a validator. It allows you to create a validator and lock/unlocking funds for staking purposes.

Delegate your funds to a validator [tx staking delegate <validator-addr> <amount>]

To bond funds for staking, you can delegate funds to a validator by the delegate command

Example: Delegate funds from Default to a validator under the address tcrocncl16k...edcer

$ ./chain-maind tx staking delegate tcrocncl16kqr009ptgken6qsxnzfnyjfsq6q97g3uedcer 100tcro --from Default --chain-id "testnet-croeseid-4" --gas-prices 0.1basetcro
## Transactions payload##
confirm transaction before signing and broadcasting [y/N]: y

Unbond your delegated funds [tx staking unbond <validator-addr> <amount>]

On the other hand, we can create a Unbond transaction to unbond the delegated funds

Example: Unbond funds from a validator under the address tcrocncl16k...edcer

$ ./chain-maind tx staking unbond tcrocncl16kqr009ptgken6qsxnzfnyjfsq6q97g3uedcer 100tcro --from Default --chain-id "testnet-croeseid-4" --gas-prices 0.1basetcro
## Transaction payload##
confirm transaction before signing and broadcasting [y/N]: y

Once your funds are unbonded, they will be locked until the unbonding_time has passed.

After you have delegated or created a validator, the reward will be accumulated, you can check/ withdraw it by:

query distribution validator-outstanding-rewards - Query un-withdrawn rewards for a validator

We can check the distribution outstanding (un-withdrawn) rewards for a validator and all of their delegations by operator address.

Example: Check all outstanding rewards under the operator address tcrocncl1...zrf8

$ ./chain-maind q distribution validator-outstanding-rewards tcrocncl1kkqxv3szgh099xezt7y38t5anqzue4s326zrf8
  - amount: "1920761912.927067330419141688"
    denom: basetcro

tx distribution validator-outstanding-rewards - Query un-withdrawn rewards for a validator

We can check distribution outstanding (un-withdrawn) rewards for a validator and all of their delegations by their operator address.

Example: Withdraw all outstanding under a delegation address:

$ ./chain-maind tx distribution withdraw-all-rewards --from [key_name] --chain-id "testnet-croeseid-4" --gas-prices 0.1basetcro

confirm transaction before signing and broadcasting [y/N]: y

tx slashing unjail - Unjail a validator

Validator could be punished and jailed due to network misbehaviour, we can check the jailing status of a validator, for example:

$ ./chain-maind query staking validators -o json | jq
      "operator_address": "tcrocncl1hct8ye56gk80qjxvrx299yu9v98aqaxe0y5kvg",
      "consensus_pubkey": {
        "@type": "/cosmos.crypto.ed25519.PubKey",
        "key": "P1/aHuScW5myVs+xH10R8yFT2u0wwaCKXfDKSuVTl60="
      "jailed": true,

Where "jailed": true implies that the validator has been jailed. After the jailing period has passed, one can broadcast a unjail transaction to unjail the validator and resume its normal operations by

$ ./chain-maind tx slashing unjail --from [key_name] --chain-id "testnet-croeseid-4" --gas-prices 0.1basetcro

  confirm transaction before signing and broadcasting [y/N]: y

Congratulations! You've successfully set up a Testnet node and performed some basic transactions! You may refer to Wallet Management for more advanced operations and transactions.

Croeseid testnet faucet and explorer

  • You can lookup data within the testnet-croeseid-4 network by the explorer;

  • To interact with the blockchain, simply use the test-token faucet to obtain test CRO tokens for performing transactions on the Croeseid testnet.

    • Note that you will need to create an address before using the faucet.

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