Messages

Groestlcoin Sentinel is the easiest and fastest way to track/receive/watch payments in your offline Groestlcoin Wallets. Groestlcoin Sentinel is compatible with any standard Groestlcoin address, BIP44 XPUB (Extended Public Key) and Segwit BIP49 YPUB.

Groestlcoin Sentinel is a great solution for anyone who wants the convenience and utility of a hot wallet for receiving payments directly into their cold storage (or future hardware wallets).
Sentinel accepts XPUB's, YPUB'S and individual Groestlcoin address. Once added you will be able to view balances, view transactions, and (in the case of XPUB's and YPUB's) deterministically generate addresses for that particular wallet.
Groestlcoin Sentinel is a fork of Groestlcoin Samourai Wallet with all spending and transaction building code removed.

Changelog v2.7.1:
• Added refresh button
• Groestlsight blockexplorer support
• Haptic PIN entry support
• Track Segwit BIP49 YPUBs
• Sweep P2PKH and Segwit P2SH-P2WPHK amounts into selected account/address
• Use https for blockexplorers

Features
• Open source and unlicensed.
• No Private Keys - Groestlcoin Sentinel only uses Public Keys. It never knows or never asks for your Private Keys.
• Track multiple XPUB's, YPUB's or Addresses - Add multiple XPUB's, YPUB's or addresses to your Groestlcoin Sentinel Watchlist to keep track of balances, transactions, and accept payments into any added wallet or address.
• Deterministically derives Groestlcoin Addresses - Deterministically derive new Groestlcoin addresses associated with your added wallets without needing access or knowledge to your private keys.
• Shareable QR code - Create payment request QR codes with address and amount encoded directly into the image. Share with anyone or any app directly from Groestlcoin Sentinel.
• The most popular Fiat currencies - Groestlcoin Sentinel can convert GRS to your local currency. Supported currencies are: USD, EUR, GBP, CNY and RUB
• Exchanges - Groestloin Sentinel can pull the current Fiat price from Cryptopia and Bittrex.
• Secure PIN Code protection - Add a secure PIN code to protect access to Groestlcoin Sentinel. Optionally turn on PIN Scramble to help thwart against keylogger attacks.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you scan a QR code from another phone.
3. Does it calculate exchange rates properly in your local currency?
4. Can you view the transactions on the block explorer?
5. Are you able to export and restore the wallet?
6. Can you add multiple XPUB's or addresses in the wallet?
7. Can you add multiple YPUB's or addresses in the wallet?
8. Can you sweep legacy paperwallet?
9. Can you sweep non native segwit paperwallet?

This application is unlicensed. 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: [email protected]
3.  Reports of errors can also be posted in this topic.

Groestlcoin sentinel is available in the Google play store:
https://play.google.com/store/apps/details?id=hashengineering.groestlcoin.samourai.sentinel

Source code:
https://github.com/Groestlcoin/groestlcoin-sentinel-android - The Groestlcoin Sentinel source code

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 wallet
BIP-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 v1.5.28:
• Added testnet support and ability to switch between mainnet and testnet
• Added support to receive from non native segwit address
• Added more electrum-grs servers

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 apps

Features
• 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 apps

It 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: [email protected]
3. Reports of errors can also be posted in this topic.

Groestlcoin-GRS Blackberry is available in the Blackberry World:
https://appworld.blackberry.com/webstore/content/59983243/

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

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

In order to bring Groestlcoin to the mainstream masses the Electrum-grs Android 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 Android implementations:
BIP-0032 to implement a hierarchical deterministic wallet
BIP-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 v1.5.28:
• Added testnet support and ability to switch between mainnet and testnet
• Added support to receive from non native segwit address
• Added more electrum-grs servers

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 apps

Features
• 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 apps

It 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 android 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: [email protected]
3. Reports of errors can also be posted in this topic.

Groestlcoin-GRS Android is available in the Google play store:
https://play.google.com/store/apps/details?id=hashengineering.groestlcoin.wallet.electrum

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Android App and possibly other software)
https://github.com/Groestlcoin/android-electrum-grs - Groestlcoin Android Electrum-grs

[Note: The QR code scanner is not supported in OSX binary]

Electrum-grs is a lightweight "thin client" groestlcoin wallet Windows, MacOS and Linux based on a client-server protocol. Its main advantages over the original Groestlcoin client include support for multi-signature wallets and not requiring the download of the entire block chain.

If you are an ordinary user of Groestlcoin and simply want the convenience of a web wallet with the security of a real application and support for multi-signature, then Elecrum-GRS is the right choice for you.

Changelog Electrum-GRS 3.0.6:
• Moved away from Linux binary file. Users must compile from source now.
• Moved away from electrum-grs-server codebase to electrumx-grs 1.2
• The source code is relicensed under the MIT Licence
• Separation between plugins and GUIs
• The command line uses jsonrpc to communicate with the daemon
• New command: 'notify <address> <url>'
• Alternative coin selection policy, designed to help preserve user privacy. Enable it by setting the Coin Selection preference to Privacy.
• The install wizard has been rewritten and improved
• Support minikeys for private key import and sweeping
• QT: add colors to labels
• The wallet file format has been upgraded. This upgrade is not backward compatible, which means that a wallet upgraded to the 2.7 format will not be readable by earlier versions of Electrum-GRS. Multiple accounts inside the same wallet are not supported in the new format; the Qt GUI will propose to split any wallet that has several accounts. Make sure that you have saved your seed phrase before you upgrade Electrum-GRS.
• This version introduces a separation between wallets types and keystores types. 'Wallet type' defines the type of Groestlcoin contract used in the wallet, while 'keystore type' refers to the method used to store private keys.
• Replace-By-Fee: RBF transactions are supported in Qt. A warning is displayed in the history for transactions that are replaceable, have unconfirmed parents, or that have very low fees.
• Qt GUI:
   - A fee slider is visible in the in send tab
   - The Address tab is hidden by default, can be shown with Ctrl-A
   - UTXOs are displayed in the Address tab
• Seed phrases can be extended with a user-chosen passphrase. The length of seed phrases is standardized to 12 words, using 132 bits of entropy. In the wizard, the type of the seed is displayed in the seed input dialog.
• Add number of confirmations to request status.
• In the GUI, refer to passphrase as 'seed extension'.
• Wizard: Hide seed options in a popup dialog.
• Separate sign and broadcast buttons in Qt tx dialog
• Allow spaces in private keys
• Add size to transaction details window
• Move plot plugin to main code
• Merge exchange_rate plugin with main code
• Faster synchronization and transaction creation
• Use fee slider for static fees
• Add fee slider to RBF dialog
• Simplify fee preferences.
• Add Testnet support
• Allow daemon to be launched in the foreground
• Qt: use separate tabs for addresses and UTXOs
• Qt: update fee slider with a network callback
• Enforce https on exchange rate APIs
• Use hardcoded list of exchanges
• Move 'Freeze' menu to Coins (utxo) tab
• Wallet file encryption using ECIES: A keypair is derived from the wallet password. Once the wallet is decrypted, only the public key is retained in memory, in order to save the encrypted file.
• The daemon requires wallets to be explicitly loaded before commands can use them. Wallets can be loaded using: 'electrum-grs daemon load_wallet [-w path]'. This command will require a password if the wallet is encrypted.
• Invoices and contacts are stored in the wallet file and are no longer shared between wallets. Previously created invoices and contacts files may be imported from the menu.
• Fees improvements:
    - Child Pays For Parent (CPFP) dialog in the GUI.
    - RBF is automatically proposed for low fee transactions.
• The GUI shows a blue icon when connected using a proxy.
• Show paid invoices in history tab
• Improve CPFP dialog
• Multiple Chain Validation: Electrum-GRS will download and validate block headers sent by servers that may follow different branches of a fork in the Groestlcoin blockchain. Instead of a linear sequence,block headers are organized in a tree structure. Branching points are located efficiently using binary search. The purpose of MCV is to detect and handle blockchain forks that are invisible to the classical SPV model.
• The desired branch of a blockchain fork can be selected using the network dialog. Branches are identified by the hash and height of the diverging block. Coin splitting is possible using RBF transaction
• MultiGroestl, Groestlwallet, Simple Groestlcoin support: If the user enters a BIP39 seed, the full derivation path is configurable in the install wizard.
• Option to send only confirmed coins
• Qt GUI:
    - Network dialog uses tabs and gets updated by network events.
    - The gui tabs use icons
• Daemon: The wallet password can be passed as parameter to the JSONRPC API.
• Validate contacts on import
• Command-line option for locktime
• Force headers download if headers file is corrupted
• Add websocket to windows builds
• The project was migrated to Python3 and Qt5. Python2 is no longer supported. If you cloned the source repository, you will need to run "python3 setup.py install" in order to install the new dependencies.
• Segwit support:
    - Native segwit scripts are supported using a new type of seed. The version number for segwit seeds is 0x100. The install wizard will not create segwit seeds by default; users must opt-in with the segwit option.
    - Native segwit scripts are represented using bech32 addresses, following BIP173. Please note that BIP173 is still in draft status, and that other wallets/websites may not support it. Thus, you should keep a non-segwit wallet in order to be able to receive groestlcoins during the transition period. If BIP173 ends up being rejected or substantially modified, your wallet may have to be restored from seed. This will not affect funds sent to bech32 addresses, and it will not affect the capacity of Electrum-GRS to spend these funds.
    - The BIP32 master keys of segwit wallets are serialized using new version numbers. The new version numbers encode the script type, and they result in the following prefixes:
         * xpub/xprv : p2pkh or p2sh
         * ypub/yprv : p2wpkh-in-p2sh
         * Ypub/Yprv : p2wsh-in-p2sh
         * zpub/zprv : p2wpkh
         * Zpub/Zprv : p2wsh
These values are identical for mainnet and testnet; tpub/tprv prefixes are no longer used in testnet wallets.
    - The Wallet Import Format (WIF) is similarly extended for segwit scripts. After a base58-encoded key is decoded to binary, its first byte encodes the script type:
         * 128 + 0: p2pkh
         * 128 + 1: p2wpkh
         * 128 + 2: p2wpkh-in-p2sh
         * 128 + 5: p2sh
         * 128 + 6: p2wsh
         * 128 + 7: p2wsh-in-p2sh
The distinction between p2sh and p2pkh in private key means that it is not possible to import a p2sh private key and associate it to a p2pkh address.
• A new version of the Electrum-GRS protocol is required by the client (version 1.1). Servers using older versions of the protocol will not be displayed in the GUI.
• By default, transactions are time-locked to the height of the current block. Other values of locktime may be passed using the command line.
• Sweeping minikeys: search for both compressed and uncompressed pubkeys
• Qt GUI: sweeping now uses the Send tab, allowing fees to be set
• Windows: if using the installer binary, there is now a separate shortcut for "Electrum-GRS Testnet"
• OS notifications for incoming transactions
• Better transaction size estimation:
    - fees for segwit txns were somewhat underestimated
    - some multisig txns were underestimated
    - handle uncompressed pubkeys
• The JSONRPC interface is password protected
• JSONRPC commands are disabled if the GUI is running, except 'ping', which is used to determine if a GUI is already running

Changelog Electrum-GRS 2.5.4:
• Linux binary file included
• Fixed sweeping private keys
• Fixed signing/verifying messages
• Electrum-GRS servers updated to 2.5.4
• Installwizard: do not allow direct copy-paste of the seed
• The QT GUI supports multiple windows in the same process. When a new Electrum-GRS instance is started, it checks for an already running Electrum-GRS process, and connects to it.
• The network layer uses select(), so all server communication is handled by a single thread. Moreover, the synchronizer, verifier, and exchange rate plugin now run as separate jobs within the networking thread instead of as their own threads.
• Plugins are revamped
• Simplified Chinese wordlist
• Dynamic Fees: using estimatefee value returned by server
• Various GUI improvements
• Arbitrary m-of-n multisig wallets are supported (n<=15).
• Transaction fees set manually in the GUI are retained, including when the user uses the '!' shortcut.
• New 'email' plugin, that enables sending and receiving payment requests by email.
• improvements to the transaction dialog:
    - request password after showing transaction
    - show change addresses in yellow color
• Improved logic for the network layer.
• More efficient coin selection. Spend oldest coins first, and minimize the number of transaction inputs.
• The command line accepts the '!' syntax to send the maximum amount available. It can be combined with the '--from' option. Example: 'payto <destination> ! --from <from_address>'
• The command line also accepts a '?' shortcut for private keys arguments, that triggers a prompt.
• Payment requests can be signed with a SSL certificate, and published as bip70 files in a public web directory.
• Show amounts (thousands separators and decimal point) according to locale in GUI
• Show unmatured coins in balance
• Faster startup, thanks to the following optimizations:
   1. Transaction input/outputs are cached in the wallet file
   2. Fast X509 certificate parser, not using pyasn1 anymore.
• The 'Invoices' and 'Send' tabs have been merged.
• Contacts are stored in a separate file, shared between wallets.
• A Search Box is available in the GUI (Ctrl-S)
• Own addresses are shown in green in the Transaction dialog.
• Address History dialog.
• The password dialog will ask for password again if the user enters a wrong password
• The Master Public Key dialog displays which keys belong to the wallet, and which are cosigners
• The transaction dialog will ask to save unsaved transaction received from cosigner pool, when user clicks on 'Close'
• The multisig restore dialog accepts xprv keys.

Features
• Encrypted wallet - the file that contains your groestlcoins is protected with a password. You are protected from thieves.
• Deterministic key generation - If you lose your wallet, you can recover it from its seed. You are protected from your own mistakes.
• Instant on - the client does not download the blockchain, it requests that information from a server. No delays, always up-to-date.
• Freedom and Privacy - The server does not store user accounts. You are not tied to a particular server, and the server does not need to know you.
• No scripts - Electrum-GRS does not download any script. A compromised server cannot send you arbitrary code and steal your groestlcoins.
• No single point of failure - The server code is open source, anyone can run a server.
• Transactions are signed locally - Your private keys are not shared with the server. You do not have to trust the server with your money.
• Firewall friendly - The client does not need to open a port, it simply polls the server for updates.
• Free software - Gnu GPL v3. Anyone can audit the code.
• Written in Python - The code is short, and easy to review.
• User Friendly - Support for Groestlcoin URIs, signed URIs and Groestlcoin aliases
• No Lock-In - You can export your private keys and use them in other groestlcoin clients.
• No Downtimes - Electrum-GRS servers are decentralized and redundant. Your wallet is never down.
• Proof Checking - Electrum-GRS Wallet verifies all the transactions in your history using SPV.
• Cold Storage - Keep your private keys offline, and go online with a watching-only wallet. Sign transactions from a computer taht is always offline. Broadcast them from a machine that does not have your keys.
• Multisign - Split the permission to spend your coins between several wallets using parallel BIP32 derivations and P2SH addresses ("2 of 2", "2 of 3"). Compact serialization format for unsigned or partially signed transactions, that includes the BIP32 master public key and derivation needed to sign inputs. Serialized transactions can be sent to cosigners or to cold storage using QR codes
• Cosigner Pool plugin - encrypted communication channel for multisign wallets, to send and receive partially signed transactions.
• Get noticed - Run a public Electrum-GRS server, publish your message and reach thousands of Groestlcoin users

It is appreciated if feedback of the following is provided:
1. Can you receive coins with legacy addresses? (small amounts to avoid losing them)
2. Can you receive coins with bech32 addresses? (small amounts to avoid losing them)
3. Can you receive coins with legacy testnet addresses? (small amounts to avoid losing them)
4. Can you receive coins with bech32 testnet addresses? (small amounts to avoid losing them)
5. Can you send coins with legacy addresses? (small amounts to avoid losing them)?
6. Can you send coins with bech32 addresses? (small amounts to avoid losing them)?
7. Can you send coins with legacy testnet addresses? (small amounts to avoid losing them)?
8. Can you send coins with bech32 testnet addresses? (small amounts to avoid losing them)?
9. Does the cosigner pool work when using a multi-signature wallet?
10. Does the virtual keyboard work when it asks to enter your wallet password?
11. Does it automatically detect servers under Tools - Network?
12. Are you able to sweep private keys?
13. Are you able to sign/verify messages?
14. Are you able to encrypt/decrypt messages?

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 me
2. Email: [email protected]
3. Post reports of erros in this topic.

Important:
Store your secret phrase somewhere safe!
The multi-signature and non native segwit addresses starts with a "3" and not with a "F".
Electrum-GRS creates an encrypted filename default_wallet instead of wallet.dat (like in Groestlcoin Core)
• Location Windows: Navigate to C:\Users\USER NAME\AppData\Roaming\Electrum-grs\wallets (or open windows explorer and enter %appdata%\Electrum-grs\wallets) and back up your default_wallet file by making a copy of it and moving it to a secure location.
• Location Mac: Navigate to ~/Library/Application Support/Electrum-grs/wallets and back up your default_wallet file by making a copy of it and moving it to a secure location.

You can download it using the links below and be up and running with Groestlcoin in 5 minutes.

Download the OSX wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.0.6/electrum-grs-v3.0.6.dmg
Note: The QR code scanner is not supported in OSX binary

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.0.6/electrum-grs-v3.0.6-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.0.6/electrum-grs-v3.0.6.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.0.6/electrum-grs-v3.0.6-portable.exe

Linux wallet instructions:
sudo apt-get install python3-setuptools python3-pyqt5 python3-pip python3-dev libssl-dev
sudo pip3 install groestlcoin_hash
sudo pip3 install https://github.com/Groestlcoin/electrum-grs/releases/download/v3.0.6/electrum-grs-3.0.6.tar.gz
electrum-grs

Source code:
GitHub Source server: https://github.com/Groestlcoin/electrumx-grs
Github Source server installer: https://github.com/Groestlcoin/electrumx-grs-installer
Github Source client: https://github.com/Groestlcoin/electrum-grs
Github Source Icons: https://github.com/Groestlcoin/electrum-grs-icons
Github Source locale: https://github.com/Groestlcoin/electrum-grs-locale

Groestlcoin BIP39 tool: an open source web tool for converting BIP39 mnemonic codes! Groestlcoin BIP39 is a tool for converting BIP39 mnemonic phrases to addresses and private keys.

Enter your BIP39 phrase into the 'BIP39 Phrase' field, or press 'Generate Random Phrase'. Use the correct derivation path and word count.
See the table for a list of addresses generated from the phrase. Toggle columns to blank to easily copy/paste a single column of data, eg to import private keys into a wallet or supply someone with a list of addresses.

Features
• Support for Groestlwallet (Use path m/0'/0)
• Support for MultiGroestl HD (Use path m/0'/0)
• Support for Simple Groestlcoin (Use path m/0'/0)
• Support for Groestlcoinomi (Use path m/44'/17'/0'/0)
• Support for Coinomi (Use path m/44'/17'/0'/0)
• Support for Groestlpay (use path m/44'/0'/0'/0)
• Support for Groestlcoin Samourai (use path m/44'/0'/0'/0 and enter BIP39 Passphrase)
• Support for GRS Mainnet and GRS Testnet
• You can enter an existing BIP39 recovery phrase, or generate a new random one (typing your own twelve words will probably not work how you expect, since the words require a particular structure as the last word is a checksum)
• Number of words support for: 3, 6, 9, 12, 15, 18, 21 and 24
• BIP32 support
• BIP44 support

Live version available at https://groestlcoin.org/bip39-standalone.html  But it is recommended to download the BIP39 tool offline and run it on your pc. Open bip39-standalone.html to get started.

It is appreciated if feedback of the following is provided:
1. Are you able to extract private keys of Groestlwallet?
2. Are you able to extract private keys of MultiGroestl HD?
3. Are you able to extract private keys of Simple Groestlcoin?
4. Are you able to extract private keys of Groestlcoin Electrum GRS?
5. Are you able to extract private keys of Coinomi?
6. Are you able to extract private keys of Groestlpay?

This application is licensed under MIT. 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 me
2. Email: [email protected]
3. Post reports of errors in this topic.

Download the Groestlcoin BIP39 tool here: https://github.com/Groestlcoin/bip39/archive/grs.zip

Source code: https://github.com/groestlcoin/bip39

Groestlcoin Webwallet: an open source, multisignature, HD Wallet and more! Webwallet is a a open source browser based Groestlcoin webwallet.

Webwallet is a playground for Groestlcoin in javascript to experiment with. It supports multisig, OP_HODL, RBF and many more. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.

Changelog:
• Segwit support added

Features
• Offline Compressed & uncompressed Address creation.
• Offline Multisignature Address creation.
• In browser Key (re)generation.
• Send and receive payments.
• Ability to decode transactions, redeem scripts and more offline.
• Build custom transactions offline.
• Sign transactions offline.
• Signatures are deterministic as per RFC 6979 (https://tools.ietf.org/html/rfc6979#section-3.2)
• Broadcast transactions.
• nLockTime support.
• Add custom data to transactions with the use of OP_RETURN.
• Brain wallet support.
• Compatible with Groestlcoin Core
• Offline qrcode creator and scanning tool
• HD (bip32) support
• CHECKLOCKTIMEVERIFY (OP_HOLD) supported for time locked addresses
• Replace by fee (RBF) Support
• Segwit Support

Live version available at http://groestlcoin.org/webwallet. But it is recommended to download the webwallet offline and run it on your pc. Open index.html to get started.
The built-in wallet can be used with any (non) existing mailaddress and any password.

It is appreciated if feedback of the following is provided:
1. Are you able to create a compressed address?
2. Are you able to create an uncompressed address?
3. Are you able to create a multisig address?
4. Are you able to receive?
5. Are you able to send?
6. Are you able to decode transactions?
7. Are you able to sign offline transactions?
8. Are you able to broadcast transactions?
9. Are you able to use the RBF option?
10. Are you able to scan the QR code?
11. Are you able to add custom data to transactions with use of OP_RETURN?
12. Are you able to use OP_HODL?
13. Are you able to use the built-in wallet?
14. Are you able to create a segwit address?


This application is licensed under MIT. 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.

Warning:
Remember the mailaddress and password you used otherwise you will loose your funds.

The application may have unfound bugs and problems. To leave feedback: 
1. PM me
2. Email: [email protected]
3. Post reports of errors in this topic.

Download the Groestlcoin Webwallet here: https://github.com/Groestlcoin/webwallet/archive/master.zip

Source code: https://github.com/groestlcoin/webwallet

Groestlcoin Segwit paperwallet: A simple groestlcoin paper wallet generator that utilizes Segregated Witness (SegWit) Pay To Witness Public Key Hash (P2WPKH) addresses and transactions.

Segwit paperwallet supports creating segwit paperwallet in bulk, keypair generation with QR codes and sweeping tool. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.

Features
• Keypair generation with QR Codes
• Bulk address generator
• Vanity generator (very slow, but hey it's javascript)
• Key Sweeping Tool to move all funds belonging to a single SegWit private key.

Live version available at https://www.groestlcoin.org/segwitpaper.html. But it is recommended to download the segwit paperwallet offline and run it on your pc. Open index.html to get started.

It is appreciated if feedback of the following is provided:
1. Are you able to generate segwit addresses?
2. Are you able to sweep segwit private key?
3. Are you able to scan with webcam?
4. Are you able to generate bulk keys?

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 me
2. Email: [email protected]
3. Post reports of errors in this topic.

Download the Groestlcoin Webwallet here: https://github.com/Groestlcoin/segwitaddress/archive/master.zip

Source code: https://github.com/Groestlcoin/segwitaddress

Instant HTML5 iOS Groestlcoin JSwallet, only controlled by you.

Groestlcoin is excited to announce our new HTML5 instant wallet, JSWallet. We've listened to the community and have created a fast, easy, sexy wallet for iOS.
                                   
Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins as all keys and info are stored client-side. Moreover, should our site ever go offline your wallet can be easily imported into another wallet system.
                                   
Create a wallet in under 5 seconds by moving your finger on the device without having to provide any user information. The client-side input of the motions generate entropy (randomness) which is couple with a random generator to create a Groestlcoin wallet.

You can consider JSWallet a hot wallet where your secret URL is your key, a key that can be further secured with a password should you so choose. JSWallet generates a brand new wallet with a public key. Look in the URL/address bar and you will see a random-looking string starting with '#' or hash – the code after the hash is your brain wallet seed, and is a 'secret link' not visible anywhere other than on your local browser. Either copy the full URL somewhere safe or bookmark it for future access.

Features
• No logins required
• Optional passwords
• Works on multiple devices
• Create a brainwallet
• Groestlcoins stored on client-side
• Written in HTML5
• Takes only 5 seconds
• Set your preferred fiat currency
• Export private key
• Export brainwallet key
• Set custom fee
• Easter egg 1 (fake send): Enter "vapor" in the amount box
• Easter egg 2 (huge balance): Enter "ballin" in the amount box
• Easter egg 3 (huge balance with sound): Enter "baron" in the amount box
• Easter egg 4 (play turn down for what): Enter "tdfw" in the amount box
• Easter egg 5 (stop playing sound): Enter "stop" in the amount box

Create your own URL by using a brainwallet. A brainwallet refers to a random passphrase that only you know. This allows you to easily remember your URL and type it on any browser to retrieve your wallet. Choosing a secure passphrase is critical. Typically a good passphrase is:
• At least 10 words long
• Use letters, capitals, numbers, and spaces
• Never been written in a book, song, or password system
• Easy for you to remember
• Impossible for someone to guess

It 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.  Do you hear a sound when sending and receiving?
5.  Does it work on all (mobile) iphone versions?
6.  Does the transaction takes couple of seconds?
7.  Does it calculate exchange rates properly?

Important:
Export your private key

The application may have unfound bugs and problems. To leave feedback: 
1. PM me
2. Email: [email protected]
3. Post reports of erros in this topic.

Groestlcoin JSWallet is available in the appstore:
https://itunes.apple.com/us/app/jswallet/id1312673741

Source code:
https://github.com/Groestlcoin/grs-rush-wallet-ios

Groestlcoin Testnet Paperwallet: JavaScript Client-Side Groestlcoin Testnet Wallet Generator

Now Groestlcoin testnet addresses and their corresponding private key can be conveniently generated in a web browser.
If you leave/refresh the site or press the "Generate New Address" button then a new private key will be generated and the previously displayed private key will not be retrievable. Your Groestlcoin private key should be kept a secret. Treat a paper Testnet wallet not like cash.
Check your balance by going to https://chainz.cryptoid.info/grs-test and entering your Groestlcoin Testnet address.

Features
• Offline single Address creation.
• Offline bulk Address creation.
• Offline brain Address creation.
• Offline vanity Address creation.
• QR code support
• In browser Key (re)generation.
• Ability to view wallet details by entering the private key.

Live version available at http://www.groestlcoin.org/testpaper.html. But it is recommended to download the testnet paperwallet offline and run it on your pc. Open testpaper.html to get started.

It is appreciated if feedback of the following is provided:
1. Are you able to create a single address?
2. Are you able to sweep private key?
3. Are you able to lookup the address on the testnet blockexplorer?
4. Are you able to send funds to the testnet address?
5. Are you able to scan the QR code with the android/blackberry testnet wallet?
6. Are you able to create bulk addresses?

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.

Warning:
For Bulk Wallet we recommended using Google Chrome, it's the fastest.
Requires IE9+, Firefox, Chrome or sufficient JavaScript support.
Mobile Safari only works with iPhone4 or newer devices. Older devices timeout while executing JavaScript.
DO NOT use Opera Mini it renders JavaScript output server side, therefore they might record the private key you generated.
BIP38 most likely will not work on mobile devices due to hardware limitations.

The application may have unfound bugs and problems. To leave feedback: 
1. PM me
2. Email: [email protected]
3. Post reports of errors in this topic.

Download the Groestlcoin Webwallet here: https://github.com/Groestlcoin/Groestlcoin-PaperWallet/archive/master.zip

Source code: https://github.com/Groestlcoin/Groestlcoin-PaperWallet

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Wallet

The app allows you to send and receive Groestlcoins on your device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself!  This will save your wallet in a password protected file.  Then your coins can be retrieved even if you loose your phone.

Changelog Groestlcoin Wallet v5.24.1 :
• After a couple of weeks of not being used, the app will notify if there are still coins in the wallet.
• Improve mechanism for setting a trusted peer and warn if its hostname cannot be resolved.
• Add warning to RBF (replace-by-fee) transactions
• Strengthen security of spending PIN.
• Speed up wallet decryption when using a spending PIN
• Supports HTTP/2 and ALPN on all HTTP calls (e.g. payment protocol).
• Slightly more robust scanning of QR codes.
• Fix detection of network state. This needs the ACCESS_NETWORK_STATE permission
• Nicely animated appearance of main screen on phones.
• Query a set of Electrum-GRS servers to swipe paper wallets

Changelog Groestlcoin Wallet 4.46.2 :
• Automatically close send coins dialog if payment was successful. This can be disabled in the settings.
• Adjusts to the new network fee rules imposed by Groestlcoin Core.
• Now requires Android 4.0.3 (ICS) for all subprojects.
• Hint to enable storage encryption.
• Allow raising the fee of an unconfirmed transaction. Uses child-pays-for-parent (CPFP).
• Pay the default fee for sweeping paper wallets.
• Setting for own name, to be added as a label/memo to payment requests.
• List animations for network monitor.
• Migrate build from Maven to Gradle. This should make things easier for Android Studio users.
• In-app payments integration (integration-android) now available on Maven Central and jCenter.
• Nice slide-in animation for sent payment.
• Tint incoming transactions in green, outgoing in red.
• Tint action bar labels.
• Material design for list of transactions.
• Update android-maven-plugin to 4.2.0, so we can use AARs.
• Use action bar submenu for filtering wallet transactions, rather than a ViewPager.
• Speed up transactions list.
• Update QR-code scanner to ZXing 3.2.0.
• Show derived addresses in address book under "your addresses".
• Show "to addresses" of received payments, rather than "from addresses".
• Speed up blockchain sync.
• Improve entry of password in backup wallet dialog.
• Share current wallet address by tapping on it.
• Update dialogs to material theme on Lollipop devices.
• Show and share extended public key. This can be used to grant read-only access to your wallet. The new option is available in the diagnostics settings.
• Record fiat amount for sent payments.

It 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 android service?
5.  How long does it take to sync the blockchain?
6.  How much space does it take up on your phone?
7.  Does it calculate exchange rates properly?
8.  Are you able to sweep paper wallet?

If the app crashes you can send the report via email or another method if your phone allows it. Reports of errors can also be posted in this topic.
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: [email protected]
3.  Reports of errors can also be posted in this topic.

You can donate in the app directly to Hashengineering for his hard work. On the menu go to "donate"

Groestlcoin Wallet is available in Blackberry world:
https://appworld.blackberry.com/webstore/content/59965920/

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Blackberry App and possibly other software)
https://github.com/Groestlcoin/groestlcoin-wallet - The Groestlcoin Blackberry Wallet Source code

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Wallet

The app allows you to send and receive Groestlcoins on your device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself!  This will save your wallet in a password protected file.  Then your coins can be retrieved even if you loose your phone.

Changelog Groestlcoin Wallet v5.24.1 :
• After a couple of weeks of not being used, the app will notify if there are still coins in the wallet.
• Improve mechanism for setting a trusted peer and warn if its hostname cannot be resolved.
• Add warning to RBF (replace-by-fee) transactions
• On Android 6.0 (Marshmellow) and above, you can now grant or revoke app permissions at will. The current permissions are: Camera (for scanning QR codes) and Read/Write External Storage (for wallet backups).
• Strengthen security of spending PIN.
• Speed up wallet decryption when using a spending PIN
• Supports HTTP/2 and ALPN on all HTTP calls (e.g. payment protocol).
• Slightly more robust scanning of QR codes.
• Fix detection of network state. This needs the ACCESS_NETWORK_STATE permission
• The app now requires Android 4.1 (Jelly Bean) or higher. This makes UI development easier in future.
• For Android 6.0 (Marshmellow) and above, bring back the ability to receive payments via Bluetooth. This means your customers can pay without being connected to the internet!
• Nicely animated appearance of main screen on phones.
• Query a set of Electrum-GRS servers to swipe paper wallets

Changelog Groestlcoin Wallet 4.46.2 :
• Automatically close send coins dialog if payment was successful. This can be disabled in the settings.
• Adjusts to the new network fee rules imposed by Groestlcoin Core.
• Now requires Android 4.0.3 (ICS) for all subprojects.
• Hint to enable storage encryption.
• Allow raising the fee of an unconfirmed transaction. Uses child-pays-for-parent (CPFP).
• Pay the default fee for sweeping paper wallets.
• Setting for own name, to be added as a label/memo to payment requests.
• List animations for network monitor.
• Migrate build from Maven to Gradle. This should make things easier for Android Studio users.
• In-app payments integration (integration-android) now available on Maven Central and jCenter.
• Nice slide-in animation for sent payment.
• Tint incoming transactions in green, outgoing in red.
• Tint action bar labels.
• Material design for list of transactions.
• Update android-maven-plugin to 4.2.0, so we can use AARs.
• Use action bar submenu for filtering wallet transactions, rather than a ViewPager.
• Speed up transactions list.
• Update QR-code scanner to ZXing 3.2.0.
• Show derived addresses in address book under "your addresses".
• Show "to addresses" of received payments, rather than "from addresses".
• Speed up blockchain sync.
• Improve entry of password in backup wallet dialog.
• Share current wallet address by tapping on it.
• Update dialogs to material theme on Lollipop devices.
• Show and share extended public key. This can be used to grant read-only access to your wallet. The new option is available in the diagnostics settings.
• Record fiat amount for sent payments.

It 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 android service?
5.  How long does it take to sync the blockchain?
6.  How much space does it take up on your phone?
7.  Does it calculate exchange rates properly?
8.  Are you able to sweep paper wallet?

If the app crashes you can send the report via email or another method if your phone allows it.  Reports of errors can also be posted in this topic.
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: [email protected]
3.  Reports of errors can also be posted in this topic.

You can donate in the app directly to Hashengineering for his hard work. On the menu go to "donate"

Groestlcoin Wallet is available in the Google play store:
https://play.google.com/store/apps/details?id=hashengineering.groestlcoin.wallet

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Android App and possibly other software)
https://github.com/Groestlcoin/groestlcoin-wallet - The Groestlcoin Android Wallet Source code

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Testnet Wallet

The app allows you to send and receive testnet Groestlcoins on your Blackberry device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself!  This will save your wallet in a password protected file.  Then your testnet coins can be retrieved even if you loose your phone.

Features:

• Sweep testnet paper wallets
• Transparant - free and open source
• Testnet blockexplorer support
• Network monitor
• Backup/restore option
• Spending pin
• tpub support
• Ability to reset blockchain
• Ability to change denomination
• Ability to connect to trusted peer
• Connectivity indicator
• BIP70 support

It is appreciated if feedback of the following is provided:
1.  Can you receive coins?
2.  Can you send coins?
3.  Can you scan a QR code from another phone.
4.  Can you request coins via email or other android service?
5.  How long does it take to sync the blockchain?
6.  How much space does it take up on your phone?
7.  Are you able to sweep paper wallet?

If the app crashes you can send the report via email or another method if your phone allows it.  Reports of errors can also be posted in this topic.
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: [email protected]
3.  Reports of errors can also be posted in this topic.

You can donate in the app directly to Hashengineering for his hard work. On the menu go to "donate"

Groestlcoin Testnet Wallet is available in the Google play store:
https://appworld.blackberry.com/webstore/content/60004887/

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Blackberry App and possibly other software)
https://github.com/Groestlcoin/groestlcoin-wallet - The Groestlcoin Blackberry Wallet Source code

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Testnet Wallet

The app allows you to send and receive testnet Groestlcoins on your Android device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself!  This will save your wallet in a password protected file.  Then your testnet coins can be retrieved even if you loose your phone.

Features:

• Sweep testnet paper wallets
• Transparant - free and open source
• Testnet blockexplorer support
• Network monitor
• Backup/restore option
• Spending pin
• tpub support
• Ability to reset blockchain
• Ability to change denomination
• Ability to connect to trusted peer
• Connectivity indicator
• BIP70 support

It is appreciated if feedback of the following is provided:
1.  Can you receive coins?
2.  Can you send coins?
3.  Can you scan a QR code from another phone.
4.  Can you request coins via email or other android service?
5.  How long does it take to sync the blockchain?
6.  How much space does it take up on your phone?
7.  Are you able to sweep paper wallet?

If the app crashes you can send the report via email or another method if your phone allows it.  Reports of errors can also be posted in this topic.
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: [email protected]
3.  Reports of errors can also be posted in this topic.

You can donate in the app directly to Hashengineering for his hard work. On the menu go to "donate"

Groestlcoin Testnet Wallet is available in the Google play store:
https://play.google.com/store/apps/details?id=hashengineering.groestlcoin.wallet_test

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Android App and possibly other software)
https://github.com/Groestlcoin/groestlcoin-wallet - The Groestlcoin Android Wallet Source code

Groestlcoin Vanitygen: Vanity groestlcoin address generator . Vanitygen is a command-line vanity groestlcoin address generator. Add unique flair when you tell people to send groestlcoins.  Alternatively, vanitygen can be used to generate random addresses offline.

If you're tired of the random, cryptic addresses generated by regular groestlcoin clients, then vanitygen is the right choice for you to create a more personalized address.

Changelog Groestlcoin Vanitygen v1.02b :
• Improved UI for setting a BIP39 passphrase
• Signed Linux and Windows binaries available
• Multiple Makefile fixes
• Multiple OpenCL fixes
• Removed the need for using the -G flag
• Add keyconv support(encryption/decryption of private keys using password)
• Fix misleading error messages
• Bugfix for compiling kernel

Features
• Vanitygen accepts as input a pattern, or list of patterns to search for, and produces a list of addresses and private keys.
• Vanitygen's search is probabilistic, and the amount of time required to find a given pattern depends on how complex the pattern is, the speed of your computer, and whether you get lucky.
• Vanitygen includes components to perform address searching on your CPU (vanitygen) and your OpenCL-compatible GPU (oclvanitygen). Both can be built from source, and both are included in the Windows binary package.
• Upon finding a match for a given pattern, vanitygen will stop searching for additional matches for that pattern. To search for multiple matches for each pattern, use the -k option
• Prefixes are exact strings that must appear at the beginning of the address. When searching for prefixes, vanitygen will ensure that the prefix is possible, and will provide a difficulty estimate.  Exact prefixes are case-sensitive by default, but may be searched case-insensitively using the -i option
• The percentage displayed just shows how probable it is that a match would be found in the session so far. If it finds your address with 5% on the display, you are extremely lucky.  If it finds your address with 92% on the display, you are unlucky.  If you stop vanitygen with 90% on the display, restart it, and it finds your address with 2% on the display, your first session was unlucky, but your second session was lucky.
• Vanitygen uses the OpenSSL random number generator. This is the same RNG used by groestlcoin and a good number of HTTPS servers. It is regarded as well-scrutinized. On Linux, the RNG will be seeded from /dev/urandom. Guessing the private key of an address found by vanitygen will be no easier than guessing a private key created by groestlcoin itself. Nonetheless, if you feel the default RNG is unable to provide numbers that are sufficiently difficult to guess, vanitygen can be directed to seed the RNG from an external file using the -s option.
• To speed up address generation, vanitygen uses the RNG to choose a private key, and literally increments the private key in a loop searching for a match. As long as the starting point is not disclosed, if a match is found, the private key will not be any easier to guess than if every private key tested were taken from the RNG. Vanitygen will also reload the private key from the RNG after 10,000,000 unsuccessful searches (100M for oclvanitygen), or when a match is found and multiple patterns are being searched for.
• Free software - Gnu GPL v3. Anyone can audit the code.
• Written in C - The code is short, and easy to review.

To use vanitygen, you need to open a command line window and change to the directory where you extracted the vanitygen program.  An easy way to do this in Windows 7, hold down the shift key, right-click on the folder where you unzipped vanitygen, and select "Open command window here."  Then, you can type the vanitygen command at the prompt. Example how to use:

Generate an address using CPU(slower):
Linux: ./vanitygen Fgrs
Windows: vanitygen.exe Fgrs
Difficulty: 78508
Pattern: Fgrs
Address: Fgrsa16NshK1ua6KyBSXahz6D9PYUbvL3d
Privkey: 5JssG8to6x62vf9pC7ktJhXc3jJV31JR1Do7qLvQEx8wVUQ37op

Generate an address using GPU(faster):
Linux: ./oclvanitygen Fgrs
Windows: oclvanitygen.exe Fgrs
Difficulty: 78508
Pattern: Fgrs
Address: FgrsjEdkYaubKoxqKJ9uGP9pHxknhrn7Vj
Privkey: 5KHCnR5HAkdrePoQiXcvJh3ZADt1EymnryySi4tkqTArnQGTwQc

Password protected private keys:
Linux: ./vanitygen -e Fgrs
Windows: vanitygen.exe -e Fgrs
Difficulty: 19627
Enter new password:
Verifying - Enter new password:
Pattern: Fgrs
Address: FgRsguD6fqcHM7HXHG6WDqSg78NrdRB4Bz
Protkey: PsTaTXeXSLDrVc8bjJVg6uTvDhdziG5jHXyM6jC1j1wf4EFCt5n5djP5rBbtnztkvQLQ

Decrypting password protected private keys:
Linux: ./keyconv -d PsTaTXeXSLDrVc8bjJVg6uTvDhdziG5jHXyM6jC1j1wf4EFCt5n5djP5rBbtnztkvQLQ
Windows: keyconv.exe -d PsTaTXeXSLDrVc8bjJVg6uTvDhdziG5jHXyM6jC1j1wf4EFCt5n5djP5rBbtnztkvQLQ
Enter import password:
Address: FgRsguD6fqcHM7HXHG6WDqSg78NrdRB4Bz
Privkey: 5JvKJy4XSeGRHapyTich5oVYiwANPbzjvFiHXSafawU4eNcD5Wt

Note: Groestlcoin addresses consist of random digits and uppercase and lowercase letters, with the exception that the uppercase letter "O", uppercase letter "I", lowercase letter "l", and the number "0" are never used to prevent visual ambiguity.

It is appreciated if feedback of the following is provided:
1. Are you able to create vanity addresses for Groestlcoin?
2. Are you able to create a password protected private key?
3. Are you able to decrypt a password protected key?
4. Are you able to sweep the private keys (using any of our clients)?
5. Are you able to import the private keys (using any of our clients)?

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 ExploitAgency on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=951625
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

Download the Groestlcoin vanitygen here:
Linux: https://github.com/Groestlcoin/vanitygen/releases/download/1.02b/linux-binary.tar.gz
Windows: https://github.com/Groestlcoin/vanitygen/releases/download/1.02b/windows-binary.zip

Source code: https://github.com/Groestlcoin/vanitygen

Instant HTML5 Blackberry Groestlcoin JSwallet, only controlled by you.

Groestlcoin is excited to announce our new HTML5 instant wallet, JSWallet. We've listened to the community and have created a fast, easy, sexy wallet for Blackberry.
                                   
Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins as all keys and info are stored client-side. Moreover, should our site ever go offline your wallet can be easily imported into another wallet system.
                                   
Create a wallet in under 5 seconds by moving your finger on the device without having to provide any user information. The client-side input of the motions generate entropy (randomness) which is couple with a random generator to create a Groestlcoin wallet.

You can consider JSWallet a hot wallet where your secret URL is your key, a key that can be further secured with a password should you so choose. JSWallet generates a brand new wallet with a public key. Look in the URL/address bar and you will see a random-looking string starting with '#' or hash – the code after the hash is your brain wallet seed, and is a 'secret link' not visible anywhere other than on your local browser. Either copy the full URL somewhere safe or bookmark it for future access.

Features
• No logins required
• Optional passwords
• Works on multiple devices
• Create a brainwallet
• Groestlcoins stored on client-side
• Written in HTML5
• Takes only 5 seconds
• Set your preferred fiat currency
• Export private key
• Export brainwallet key
• Set custom fee
• Easter egg 1 (fake send): Enter "vapor" in the amount box
• Easter egg 2 (huge balance): Enter "ballin" in the amount box
• Easter egg 3 (huge balance with sound): Enter "baron" in the amount box
• Easter egg 4 (play turn down for what): Enter "tdfw" in the amount box
• Easter egg 5 (stop playing sound): Enter "stop" in the amount box

Create your own URL by using a brainwallet. A brainwallet refers to a random passphrase that only you know. This allows you to easily remember your URL and type it on any browser to retrieve your wallet. Choosing a secure passphrase is critical. Typically a good passphrase is:
• At least 10 words long
• Use letters, capitals, numbers, and spaces
• Never been written in a book, song, or password system
• Easy for you to remember
• Impossible for someone to guess

It 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.  Do you hear a sound when sending and receiving?
5.  Does it work on all (mobile) browsers?
6.  Does the transaction takes couple of seconds??
7.  Does it calculate exchange rates properly?

Important:
Export your private key

The application may have unfound bugs and problems. To leave feedback: 
1. PM me
2. Email: [email protected]
3. Post reports of erros in this topic.

Groestlcoin JSWallet is available in the Blackberry world:
https://appworld.blackberry.com/webstore/content/60004655/

Source code:
https://github.com/Groestlcoin/grs-rush-wallet-android