Desktop Wallets Groestlcoin Core Groestlcoin Core is a full Groestlcoin client and builds the backbone of the network. It offers high levels of security, privacy, and stability. However, it has fewer features and it takes a lot of space and memory. Electrum-GRS Electrum-GRS's focus is speed and simplicity, with low resource usage. It uses remote servers that handle the most complicated parts of the Groestlcoin system, allowing you to recover your wallet from a secret phrase.