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Network Details

Umbraline Testnet is an Avalanche Subnet with GHOST as the native gas token.

Network Configuration​

PropertyValue
Chain ID47474
Chain ID (hex)0xB99A
RPC URLhttps://testnet-rpc.umbraline.com
Block Explorerhttps://umbrascan.com
Native TokenGHOST
Block Time~2 seconds

Adding to MetaMask​

Manual Configuration:

  1. Open MetaMask → Networks → Add Network
  2. Enter the following:
    • Network Name: Umbraline Testnet
    • RPC URL: https://testnet-rpc.umbraline.com
    • Chain ID: 47474
    • Currency Symbol: GHOST
    • Block Explorer URL: https://umbrascan.com

Programmatic:

await window.ethereum.request({
  method: 'wallet_addEthereumChain',
  params: [{
    chainId: '0xB99A',
    chainName: 'Umbraline Testnet',
    nativeCurrency: {
      name: 'GHOST',
      symbol: 'GHOST',
      decimals: 18,
    },
    rpcUrls: ['https://testnet-rpc.umbraline.com'],
    blockExplorerUrls: ['https://umbrascan.com'],
  }],
});

Gas Costs​

OperationEstimated Gas
commit()~75K-100K
commitWithCallback()~100K-150K
verifyAndNullify()~150K-200K
revealWithCallback()~200K-300K
info

Gas costs are estimates. Actual costs may vary based on proof complexity and callback logic. Verify with actual transactions on testnet.

Getting Testnet GHOST​

Use the faucet at portal.ghostcoin.com/faucet:

  • Rate limit: 1 request per address per 24 hours
  • Amount: 100 GHOST per request

Checking Connection​

# Check current block
cast block-number --rpc-url https://testnet-rpc.umbraline.com

# Check chain ID
cast chain-id --rpc-url https://testnet-rpc.umbraline.com