Cronos POS

Overview

CRONOS is the native asset of the Cronos POS blockchain. It utilizes:

Account model
EcDSA signature algorithm

Cronos POS is a Cosmos SDK–based Layer 1 using Tendermint BFT consensus with Proof-of-Stake (PoS). Validators finalize blocks, ensuring high throughput and instant finality. The network natively supports IBC for cross-chain communication.

Explorer

https://cronos-pos.org/explorer/

Wallets Types

BitGo enables holding Cronos POS in the following wallet types:

	Multisig Cold	Multisig Hot	MPC Cold	MPC Hot
Custodial	❌	❌	✅	❌
Self Managed	❌	❌	✅	✅

Ticker Symbols

Mainnet	Testnet
cronos	tcronos

Faucet

Testnet tcronos coins can be requested from the Cronos POS faucet.

Units

CRO is divisible by 10^-8 and the base unit is a basecro:

1 cro = 100,000,000 basecro
1 basecro = 0.00000001 cro

Cronos POS balances can be in either integer or string format. However, BitGo recommends using string format to ensure values don't exceed the programmable number limit.

Tokens

The Cronos POS blockchain doesn't natively support tokens.

Fees

CRO has the following fees:

Minimum fee = 0.0003 CRO
Default fee rate = 0.0003 CRO

Address Format

Cronos addresses follow the format: cro1<38-character-bech32-body>. All addresses are exactly 42 characters in length and begin with the fixed prefix cro1. This format adheres to the following regular expression:

/^(cro)1(['qpzry9x8gf2tvdw0s3jn54khce6mua7l]{38})$/

Memo ID Support

Optionally, a ?memoId=<n> query parameter can be appended to the address for use cases such as identifying transaction metadata. Here, <n> can be any integer.
Using memoId-based addressing eliminates the need to generate multiple deposit addresses per user. A single static address can be reused safely across users and use cases, with the memoId serving as the unique identifier.
Since Cronos uses memoId-based receive addresses, manual consolidation is not required.

Create Wallet

    export BITGO_EXPRESS_HOST="<YOUR_LOCALHOST>"
    export COIN="tcronos"
    export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
      export LABEL="<DESIRED_WALLET_NAME>"
        export PASSPHRASE="<YOUR_BITGO_LOGIN_PASSPHRASE>"
          export ENTERPRISE_ID="<YOUR_ENTERPRISE_ID>"

            curl -X POST \
            http://$BITGO_EXPRESS_HOST/api/v2/$COIN/wallet/generate \
            -H 'Content-Type: application/json' \
            -H "Authorization: Bearer $ACCESS_TOKEN" \
            -d '{
              "label": "'"$LABEL"'",
              "passphrase": "'"$PASSPHRASE"'",
              "enterprise": "'"$ENTERPRISE_ID"'",
              "disableTransactionNotifications": true,
              "disableKRSEmail": true
            }'

    const { BitGo } = require('bitgo');

    const accessToken = '<YOUR_ACCESS_TOKEN>';

    // Initialize the SDK
    const bitgo = new BitGo({
      accessToken: accessToken,
      env: 'test',
    });

    // Generate hot wallet
    async function createHotWalletSimple() {
      const newWallet = await bitgo.coin('tcronos').wallets().generateWallet({
      label: '<DESIRED_WALLET_NAME>',
      passphrase: '<YOUR_BITGO_LOGIN_PASSWORD>',
    });

      console.log(JSON.stringify(newWallet, undefined, 2));
    }

Create Address

    export COIN="tcronos"
    export WALLET_ID="<YOUR_WALLET_ID>"
    export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"

      curl -X POST \
      https://app.bitgo-test.com/api/v2/$COIN/wallet/$WALLET_ID/address \
      -H 'Content-Type: application/json' \
      -H "Authorization: Bearer $ACCESS_TOKEN"

    const { BitGo } = require('bitgo');
    const accessToken = '<YOUR_ACCESS_TOKEN>';

    // Initialize the SDK
    const bitgo = new BitGo({
      accessToken: accessToken,
      env: 'custom',
      customRootURI: 'https://app.bitgo.com',
    });

    // Create address
    const wallet = await bitgo.coin('tcronos').wallets().generateWallet({
      label: '<DESIRED_WALLET_NAME>',
      passphrase: '<YOUR_BITGO_LOGIN_PASSPHRASE>',
    });

    const address = await wallet.createAddress(
    );

    // Print address details
    console.log(JSON.stringify(address, undefined, 2));

Estimate Fee

    export COIN="tcronos"
    export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"

    curl -X GET \
    https://app.bitgo-test.com/api/v2/$COIN/tx/fee \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $ACCESS_TOKEN"

    const BitGoJS = require('../../../src/index.js');
    const bitgo = new BitGoJS.BitGo({ env: 'test' });
    const accessToken = '<YOUR_ACCESS_TOKEN>';
    const coin = 'tcronos';
    async function getFeeEstimate() {
      try {
        await bitgo.authenticateWithAccessToken({ accessToken });
        const res = await bitgo.coin(coin).feeEstimate({ numBlocks: 2 });
        console.dir(res);
      } catch (err) {
        console.error('Error fetching fee estimate:', err);
      }
    }
    getFeeEstimate();

Transact

    export BITGO_EXPRESS_HOST="<YOUR_LOCALHOST>"
    export COIN="tcronos"
    export WALLET_ID="<YOUR_WALLET_ID>"
      export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
        export ADDRESS="<DESTINATION_ADDRESS>"
          export AMOUNT="<AMOUNT_IN_BASE_UNITS>"
            export WALLET_PASSPHRASE="<YOUR_WALLET_PASSPHRASE>"

              curl -X POST \
              http://$BITGO_EXPRESS_HOST/api/v2/$COIN/wallet/$WALLET_ID/sendcoins \
              -H 'Content-Type: application/json' \
              -H "Authorization: Bearer $ACCESS_TOKEN" \
              -d '{
                "address": "'"$ADDRESS"'",
                "amount": "'"$AMOUNT"'",
                "walletPassphrase": "'"$WALLET_PASSPHRASE"'"
              }'

    export BITGO_EXPRESS_HOST="<YOUR_LOCALHOST>"
    export COIN="tcronos"
    export WALLET_ID="<YOUR_WALLET_ID>"
      export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
        export ADDRESS_1="<DESTINATION_ADDRESS_1>"
          export ADDRESS_2="<DESTINATION_ADDRESS_2>"
            export AMOUNT_1="<AMOUNT_1_IN_BASE_UNITS>"
              export AMOUNT_2="<AMOUNT_2_IN_BASE_UNITS>"
                export WALLET_PASSPHRASE="<YOUR_WALLET_PASSPHRASE>"

                  curl -X POST \
                  http://$BITGO_EXPRESS_HOST/api/v2/$COIN/wallet/$WALLET_ID/sendmany \
                  -H 'Content-Type: application/json' \
                  -H "Authorization: Bearer $ACCESS_TOKEN" \
                  -d '{
                    "recipients": [
                  {
                    "address": "'"$ADDRESS_1"'",
                    "amount": "'"$AMOUNT_1"'"
                  },
                  {
                    "address": "'"$ADDRESS_2"'",
                    "amount": "'"$AMOUNT_2"'"
                  }
                    ],
                    "walletPassphrase": "'"$WALLET_PASSPHRASE"'"
                  }'

    const tx = await fundedWallet.send({
    address: `<DESTINATION_ADDRESS>`,
    amount: `<AMOUNT>`,
    walletPassphrase: process.env.PASSWORD as string,
  });

    let params = {
    recipients: [
  {
    amount: "<AMOUNT_1>",
    address: "<DESTINATION_ADDRESS_1>",
  },
  {
    amount: "<AMOUNT_2>",
    address: "<DESTINATION_ADDRESS_2>",
  },
    ],
    walletPassphrase: "<YOUR_WALLET_PASSPHRASE>",
  };
    wallet.sendMany(params).then(function (transaction) {
    // Print transaction details
    console.dir(transaction);
  });