Chain Configuration

Specter is a Cosmos SDK-based blockchain with a full EVM execution environment. This page documents all chain identifiers, RPC endpoints, native token parameters, and related configuration details.

Chain Identity

Parameter	Value
EVM Chain ID	5446 (decimal) / 0x1546 (hex)
Cosmos chain-id	umbraline_9001-1
Bech32 prefix	umbra
Consensus	CometBFT (Byzantine Fault Tolerant)
Execution	EVM-compatible (go-ethereum based)

Chain ID 47474 is Deprecated

An earlier Avalanche L1 deployment used Chain ID 47474. That chain is no longer active. If you have 47474 configured in your wallet or application, you must update to 5446. Symptoms of using the wrong chain ID include:

• Balance showing 0 despite receiving tokens
• Transactions failing silently
• RPC calls returning unexpected results

RPC Endpoints

Endpoint	Type	Status
https://testnet.specterchain.com	EVM JSON-RPC	Primary
https://testnet.umbraline.com	EVM JSON-RPC	Active (legacy alias)
https://testnet-rpc.umbraline.com	EVM JSON-RPC	May be stale — avoid for production

Both testnet.specterchain.com and testnet.umbraline.com resolve to the same infrastructure and are interchangeable. Use testnet.specterchain.com as the canonical endpoint.

caution

The testnet-rpc.umbraline.com endpoint may point to a stale or unmaintained node. Always prefer testnet.specterchain.com for reliable connectivity.

RPC Methods

Specter supports standard Ethereum JSON-RPC methods with the following caveats:

Method	Support	Notes
eth_getBalance	Full	Returns native GHOST balance in aghost (wei equivalent).
eth_call	Full	Standard contract call support.
eth_sendRawTransaction	Full	Standard transaction submission.
eth_getTransactionReceipt	Partial	May return parse errors for certain transaction types. Use computed addresses instead of relying on receipt logs for CREATE/CREATE2 deployments.
eth_getLogs	Limited	Known limitation: May return empty results due to Cosmos EVM indexing constraints. Use the relayer indexer API (relayer.specterchain.com/api/indexer) for reliable event queries.
eth_getBlockByNumber	Full	Standard block queries.
eth_estimateGas	Full	Standard gas estimation.

Native Token

Parameter	Value
Name	GHOST
Symbol	GHOST
Decimals	18
Smallest unit	aghost
Conversion	1 GHOST = 10^18 aghost
Genesis supply	1,000,000,000 GHOST (1 billion)

The aghost denomination follows the Cosmos SDK convention of using an a prefix for the smallest unit (analogous to aevmos, aatom in other Cosmos chains). In the EVM context, aghost is equivalent to wei — the 18-decimal base unit.

Minting and Burning

Unlike standard EVM chains where the native token cannot be minted or burned by contracts, Specter provides the ghostmint precompile at address 0x0808. This precompile bridges between the EVM and the Cosmos x/bank module, enabling:

• Minting: The NativeAssetHandler contract mints fresh GHOST during reveal operations.
• Burning: The NativeAssetHandler burns GHOST during commit operations.

Only the NativeAssetHandler (0xA0bA5389b07BAdDAaE89B8560849774Bf015acc3) is authorized to call the precompile.

Relayer API

The Specter relayer provides off-chain services that complement the on-chain protocol:

Endpoint	Description
https://relayer.specterchain.com/api/merkle-proof	Fetch Merkle inclusion proofs for a given leaf index.
https://relayer.specterchain.com/api/submit-reveal	Submit reveal transactions via the relayer (gasless reveals).
https://relayer.specterchain.com/api/tree-status	Query current Merkle tree root, size, and sync status.
https://relayer.specterchain.com/api/indexer	Query indexed on-chain events (commitments, reveals, transfers).
https://relayer.specterchain.com/api/health	Relayer health check.

Cosmos Configuration

For applications interacting with the Cosmos layer (staking, governance, IBC):

Parameter	Value
chain-id	umbraline_9001-1
Bech32 prefix	umbra
Coin type	60 (Ethereum)
Address format	umbra1... (Bech32) or 0x... (EVM hex)
Key algorithm	eth_secp256k1

Address Interoperability

Specter uses the same key derivation as Ethereum (coin type 60, secp256k1). A single private key maps to both:

• An EVM address: 0x... (20 bytes, hex-encoded)
• A Cosmos address: umbra1... (Bech32-encoded with the umbra prefix)

Both addresses refer to the same account. Use the EVM address for smart contract interactions and the Cosmos address for native Cosmos operations (staking, governance, IBC transfers).

MetaMask Configuration

Add Specter to MetaMask with these parameters:

Field	Value
Network Name	Specter Testnet
RPC URL	https://testnet.specterchain.com
Chain ID	5446
Currency Symbol	GHOST
Decimals	18

Faucet

The testnet faucet provides GHOST tokens for development and testing:

• Amount: 100 GHOST per request
• Cooldown: 24 hours per address
• Endpoint: POST https://faucet.specterchain.com/api/drip
• Body: {"address": "0xYourAddress"}