//! let block_hash = genesis_block(Network::Bitcoin).header.block_hash();
//! let network_graph = NetworkGraph::new(block_hash, &logger);
//! let rapid_sync = RapidGossipSync::new(&network_graph);
//! let block_hash = genesis_block(Network::Bitcoin).header.block_hash();
//! let network_graph = NetworkGraph::new(block_hash, &logger);
//! let rapid_sync = RapidGossipSync::new(&network_graph);