Electrum-grs Blackberry is a lightweight "thin client" Groestlcoin Blackberry wallet based on a client-server protocol. Its main advantages over the original Groestlcoin Blackberry wallet include support for not requiring to sync with the blockchain.

In order to bring Groestlcoin to the mainstream masses the Electrum-grs Blackberry wallet (v0.5.22) is ready for testing. The app allows you to send and receive Groestlcoins on your device without syncing the blockchain. When using this app, please store your secret phrase and email them to yourself! Then your coins can be retrieved even if you loose your phone. Furthermore, this puts the user in total control of their funds at any given time.Electrum-grs Blackberry implementations:BIP-0032 to implement a hierarchical deterministic walletBIP-0039 to implement a mnemonic code of mnemonic sentence for the generation of deterministic wallets (process for turning in into a BIP-0032 seed)Changelog Groestlcoin Electrum GRS v1.5.25 :• Improved UI for setting a BIP39 passphrase• Fixed memory leak when restoring a wallet• Fixed crashes on some devices• Possibility to sign and verify messages• Account details screen to view the public key• Some UI optimizations• Bug fixes• Increase the default size of the recovery phrase• Can set an amount in receive screen• Small optimizations when handling the QR code and transactions• Added ability to spend own unconfirmed change funds• Support payment URIs requests from browsers and other appsFeatures• Exchange rates for various national currencies• Manual receiving address management (enable in settings)• Wallet only needs to be backed up once, on initial creation• Wallet backup consists of simple list of 12 common words (BIP-0039)• Empty the wallet with 1 click• Automatic connectivity management with fast reconnects and detection of network change• Password protect your recovery phrase• Top security - Electrum-grs uses bank grade technology. Your money is kept safe by guaranteeing that your private keys will never leave your gadget. The user has absolute control• Warning if there are no connections to the Electrum-GRS servers• Click on any addresses to edit the label or copy it• Support payment URIs requests from browsers and other appsIt is appreciated if feedback of the following is provided:1. Can you receive coins? (small amounts to avoid losing them)2. Can you send coins?3. Can you scan a QR code from another phone.4. Can you request coins via email or other Blackberry service?5. Does it calculate exchange rates properly?6. How fast is a transaction?Important:Store your secret phrase somewhere safe!To close the app, simply press the back button until you reach your home screen. The app will close itself (there is no need for a disconnect option). This application is licensed under the GPL version 3. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.The application may have unfound bugs and problems. To leave feedback:1. PM hashengineering on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=155038 2. Email: hashengineeringsolutions@gmail.com3. Reports of errors can also be posted in this topic.Groestlcoin-GRS Blackberry is available in the Blackberry World:Source code: https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Blackberry App and possibly other software) https://github.com/Groestlcoin/android-electrum-grs - Groestlcoin Blackberry Electrum-grs