# Class BSV::Network::Protocols::Chaintracks <a id="class-BSV-Network-Protocols-Chaintracks"></a>

**Inherits:** `BSV::Network::Protocol`

Chaintracks implements the GorillaPool Chaintracks API as a Protocol subclass.

Provides block header lookup and current chain tip height via the GorillaPool
Chaintracks v2 REST API. Pure DSL — no escape hatches needed.

Chaintracks does not use a +{network}+ placeholder in the URL. Mainnet and
testnet are served from separate base URLs; the provider defaults supply the
correct URL for each network.

## Usage

    ct = BSV::Network::Protocols::Chaintracks.new(base_url: 'http://localhost:8080')
    result = ct.call(:current_height)
    result.data  # => 800000

    result = ct.call(:get_block_header, 800_000)
    result.data  # => { 'hash' => '...', 'height' => 800000, 'merkle_root' => '...' }

- **@note** No public Chaintracks instance is hosted by major providers — GorillaPool
serves chain data via JungleBus instead. For general chain-tracking against
GorillaPool, use the porcelain interface:
+BSV::Transaction::ChainTracker.new(BSV::Network::Providers::GorillaPool.mainnet)+
which routes through JungleBus automatically.

## Public Instance Methods
### `initialize(base_url:, api_key: = nil, auth: = nil, http_client: = nil)` <a id="method-i-initialize"></a> <a id="initialize-instance_method"></a>
- **@param** `base_url` [String] base URL for the Chaintracks API
- **@param** `api_key` [String, nil] legacy Bearer API key shorthand — use +auth:+ for new code
- **@param** `auth` [Hash, Symbol, nil] auth config; takes precedence over +api_key:+
- **@param** `http_client` [Object, nil] injectable HTTP client for testing
- **@return** [Chaintracks] a new instance of Chaintracks