Function new_rest_chain_service 

pub async fn new_rest_chain_service(
    url: String,
    network: Network,
    api_type: ChainApiType,
    credentials: Option<Credentials>,
) -> Arc<dyn BitcoinChainService>

Constructs a shareable REST-based BitcoinChainService.

Pass the returned Arc to multiple SdkBuilders via SdkBuilder::with_chain_service to reuse a single underlying HTTP client (and its connection pool) across SDK instances. All SDKs sharing the service must use the same network.

For one-off, non-shared use, prefer SdkBuilder::with_rest_chain_service.