DarkCrave is a PoS-based cryptocurrency. DarkCrave is dependent upon libsecp256k1. DarkCrave includes an Address Index feature, based on the address index API (searchrawtransactions RPC command) implemented in Bitcoin Core but modified implementation to work with the DarkCrave codebase (PoS coins maintain a txindex by default for instance). DarkCrave is a free open source project derived from Bitcoin, with the goal of providing a long-term energy-efficient scrypt-based crypto-currency. Built on the foundation of Bitcoin, PPCoin and NovaCoin, innovations such as proof-of-stake help further advance the field of crypto-currency.