Messages

Aegis Groestlcoin Wallet is developed using the highest standards in the fields of cryptography and information security. It utilises proven security algorithms and protocols to deliver you a first class application/system and user experience. Its main advantages over the original Groestlcoin Android wallet include support for android wear, watch address, NFC tag as encryption and sending GRS over SMS.

If you want to use your android wearables, track a watch address, use a NFC tag as encryption or send GRS over SMS then Aegis GroestlCoin wallet is the way to go!

Changelog Aegis Groestlcoin Wallet 1.1.6.3 :
• Updated DNS seeds
• Updated Checkpoints
• Updated Protocol number
• Bloom filters enabled

Features
• NFC Security - Store your encryption key separate on an NFC tag.
• Keys are encrypted on the device at all times
• Active GroestlCoin Wallet - Balance and transactions are continuously updated in real-time
• If your phone is lost or stolen, your GRS is safe due to encryption
• New user interface that is easy to use
• Import of private keys
• Watch addresses - Track watch addresses
• SMS support - If you don't know a person's Groestlcoin address, you can put in their mobile number and they will receive an SMS telling them to reply with their Groestlcoin address. Once they reply, Aegis will take the address and ask you to confirm. The Aegis Wallet app does not read your SMS messages or send them to any place
• Android wear support - Support for android wear notifications, receive address, display qr code and balance
• Backup your Groestlcoins securely using the Aegis Backup feature, then restore your wallet when needed
• Transparant - Aegis Groestlcoin Wallet is free and open source

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 send GRS over SMS?
5. Does it calculate exchange rates properly?
6. How fast is a transaction?
7. Can you use a NFC tag as encryption without problems?
8. Is the watch-only function working properly?
9. Is your android wear working fine with Aegis Groestlcoin wallet?

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.

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

Source code:
https://github.com/GroestlCoin/groestlcoinj - Groestlcoin Java Library for Aegis Groestlcoin wallet
https://github.com/GroestlCoin/AegisWallet - The Aegis GroestlCoin wallet

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 v1.5.25 :
• 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

A BIP-0032/-0039/-0044 compatible Hierarchical Deterministic Groestlcoin Wallet

After a measure of hard work adapting the latest Wallet32 (v0.3.17) for Android to Groestlcoin, the Groestlcoin wallet32 beta (v0.1.3) is ready for testing. The app allows you to send and receive Groestlcoins on your device using QR codes and URI links. 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.

Groestlcoin wallet32 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)
BIP-0044 to implement a logical hierarchy for deterministic wallets based on an algorithm described in BIP-0032 (specific format of a BIP-0032 wallet)

Changelog Groestlcoin Wallet32 v0.1.3h :
• Updated DNS seeds
• Updated Checkpoints
• Updated Protocol number
• Bloom filters enabled
• Changed all KeyCrypts to Groestl

Features
• Multiple logical "accounts" within each wallet.
• Fresh receive and change addresses are used for each transfer.
• Wallet only needs to be backed up once, on initial creation.
• Wallet backup consists of simple list of 12 common words (BIP-0039).
• Same wallet may be securely accessed concurrently from multiple devices.
• Wallet data is protected by Groestl passcode.
• Import paper wallets and sweep them.

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?

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 Wallet32 is available in the Google play store:
https://play.google.com/store/apps/details?id=hashengineering.groestlcoin.wallet32

Source code:
https://github.com/HashEngineering/groestlcoinj - Groestlcoin Java Library (for the Android App and possibly other software)
https://github.com/GroestlCoin/GroestlCoin-Wallet32 - The Groestlcoin wallet32 Android Source code

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Wallet

After a measure of hard work adapting the latest Bitcoin wallet (v4.46) for Android to Groestlcoin, the Groestlcoin Android wallet beta (v4.46) is ready for testing.
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 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

Hi gielbier!

I have seen your work on github and it is impressive. We have good hopes that you will be successfull on Groestlcore. Welcome in our team.

Best regards,

gruve_p

Just saying Hi,

I'm gielbier (oooow no, an other dutchie).

I'm a NodeJS-dev, doing mostly mobile applications atm.
Also wrote some stuff for bit-post (text/tuts), wrote some code for cryptobetfair (JS clientside provably fair validator), also made a twitter tipbot. (https://github.com/Biersteker/node-tip-bot-twitter) and a lot of other stuff.

Working on porting bitcore (fullstack) for groestl atm.

[Note: The QR code scanner is not supported in Windows and OSX binaries]

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 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? (small amounts to avoid losing them)
2. Can you send coins?
3. Does the cosigner pool work when using a multi-signature wallet?
4. Does the virtual keyboard work when it asks to enter your wallet password?
5. Does it automatically detect electrum1.groestlcoin.org and electrum2.groestlcoin.org under Tools - Network?
6. Are you able to sweep private keys?
7. Are you able to sign/verify messages?
8. 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 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 Linux wallet here: https://github.com/GroestlCoin/electrum-grs/releases/download/v2.5.4/Electrum-GRS-2.5.4_Linux_x86_64-Installer.bin
Download the OSX PKG wallet here: https://github.com/GroestlCoin/electrum-grs/releases/download/v2.5.4/Electrum-GRS-2.5.4-Installer.pkg
Download Windows wallet here: https://github.com/GroestlCoin/electrum-grs/releases/download/v2.5.4/Electrum-grs-2.5.4-Windows-setup.exe
Note: The QR code scanner is not supported in Windows and OSX binaries

Source code:
GitHub Source server: https://github.com/Groestlcoin/electrum-grs-server
Github Source client: https://github.com/Groestlcoin/electrum-grs

Groestlcoin SGminer5-grs is now available. Its main advantages over the original SGminer5 binary include support for GBT solo mining along with signing your mined blocks.

If you want to solo mine with Groestlcoin then SGminer5-grs is the right choice for you

Features
• GBT solo mining support by using the --grs-address flag
• Support to add a signature to sign your mined blocks by using the --grs-sig flag
• Free software - Gnu GPL v3. Anyone can audit the code.
• Written in C - The code is short, and easy to review.
• User Friendly - no need to use the --difficulty-multiplier flag anymore
• Multiple Groestlcoin kernels included for testing

Example how to use:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_HEAP_SIZE 50
sgminer.exe -k groestlcoin -o http://192.168.1.2:1441 -u u -p p --grs-address FZ4AfMJjHNzjtMHvFR244TZf2934Y6J5Fr --grs-sig YourSignatureHere -g 1 -w 256 --no-submit-stale -I 20 --gpu-engine 1100 --gpu-memclock 1500 --gpu-fan 100

It is appreciated if feedback of the following is provided:
1. Can you solo mine?
2. Can you pool mine?
3. Can you sign your own mined blocks?

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 or damage your CPU/GPU, 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 Wolf on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=80740
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

Download the SGminer5-grs here: https://github.com/Groestlcoin/sgminer/releases/download/1.1/sgminer5-grs.zip

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

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 to FXSLUT2zcZPnhJ7J3BqGUCQMj5cEUyN31V.  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.

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:
vanitygen -G FXSLUT
Difficulty: 264104224
Pattern: FXSLUT                                                               
Address: FXSLUT2zcZPnhJ7J3BqGUCQMj5cEUyN31V
Privkey: 5KNtRRpMfpYXVuSv86GF2pKhS4TDvVGy4c2L6psSLRkPikFbzUf

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 sweep the private keys (using any of our clients)?
3. 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 Wolf on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=80740
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

Download the Groestlcoin vanitygen here: https://github.com/GroestlCoin/vanitygen/releases/download/1.0/grs-vanitygen.zip

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

A BIP-0032/-0039/-0044 compatible Hierarchical Deterministic Groestlcoin Wallet

After a measure of hard work adapting the latest Wallet32 (v0.3.17) for Blackberry to Groestlcoin, the Groestlcoin wallet32 beta (v0.1.3) is ready for testing. The app allows you to send and receive Groestlcoins on your device using QR codes and URI links. 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.

Groestlcoin wallet32 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)
BIP-0044 to implement a logical hierarchy for deterministic wallets based on an algorithm described in BIP-0032 (specific format of a BIP-0032 wallet)

Features
• Multiple logical "accounts" within each wallet.
• Fresh receive and change addresses are used for each transfer.
• Wallet only needs to be backed up once, on initial creation.
• Wallet backup consists of simple list of 12 common words (BIP-0039).
• Same wallet may be securely accessed concurrently from multiple devices.
• Wallet data is protected by Groestl passcode.
• Import paper wallets and sweep them.

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.  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?

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 Wallet32 is available in the Blackberry World:
https://appworld.blackberry.com/webstore/content/59983902/

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library (for the Blackberry App and possibly other software)
https://github.com/Groestlcoin/GroestlCoin-Wallet32 - The Groestlcoin wallet32 Blackberry Source code

Aegis Groestlcoin wallet is developed using the highest standards in the fields of cryptography and information security. It utilises proven security algorithms and protocols to deliver you a first class application/system and user experience. Its main advantages over the original Groestlcoin Blackberry wallet include support for android wear, watch address, NFC tag as encryption and sending GRS over SMS.

If you want to use your Android wearables, track a watch address, use a NFC tag as encryption or send GRS over SMS then Aegis GroestlCoin wallet is the way to go!

Features
• NFC Security - Store your encryption key separate on an NFC tag
• Keys are encrypted on the device at all times
• Active Groestlcoin wallet - Balance and transactions are continuously updated in real-time
• If your phone is lost or stolen, your GRS is safe due to encryption
• New user interface that is easy to use
• Import of private keys
• Watch addresses - Track watch addresses
• SMS support - If you don't know a person's Groestlcoin address, you can put in their mobile number and they will receive an SMS telling them to reply with their Groestlcoin address. Once they reply, Aegis will take the address and ask you to confirm. The Aegis Wallet app does not read your SMS messages or send them to any place
• Android wear support - Support for android wear notifications, receive address, display qr code and balance
• Backup your Groestlcoins securely using the Aegis Backup feature, then restore your wallet when needed
• Transparant - Aegis Groestlcoin Wallet is free and open source

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 send GRS over SMS?
5. Does it calculate exchange rates properly?
6. How fast is a transaction?
7. Can you use a NFC tag as encryption without problems?
8. Is the watch-only function working properly?
9. Is your android wear working fine with Aegis Groestlcoin wallet?

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.

Aegis Groestlcoin wallet is available in the Blackberry World:
https://appworld.blackberry.com/webstore/content/59984007/

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library for Aegis Groestlcoin wallet
https://github.com/Groestlcoin/AegisWallet - The Aegis GroestlCoin wallet

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)

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

Groestlcoin Armory is the most secure and full featured solution available for advanced users and enterprise business to generate and store Groestlcoin private keys. Groestlcoin Armory empowers users with multiple encrypted Groestlcoin wallets and provides permanent one-time 'paper backups'. Groestlcoin Armory makes Groestlcoin security best practices accessible to everyone through its unique interface and is created with developers in mind for building Groestlcoin apps like exchanges and crowdfunding platforms. Groestlcoin Armory has no independent networking components built in. Instead, it relies on the Groestlcoin Core to securely connect to peers, validate blockchain data, and broadcast transactions for us. The reliance on Groestlcoin Core right now is actually making Groestlcoin Armory more secure!

If you want to manage multiple wallets (deterministic and watching-only), print paper backups that work forever, import or sweep private keys, and keep your savings in a computer that never touches the internet (while still being able to manage incoming payments, and create outgoing payments with the help of a USB key) Groestlcoin Armory is the right choice for you!

Features
• Encrypted wallet (optional). Wallet encryption with GPU-resistent key derivation function: AES256 in-place key encryption. Encryption key is generated with a scrypt-based algorithm to renders GPU-acceleration useless for brute-force passphrase guessing. Speed and memory parameters are calibrated to your system speed.
• Corruption-resistent wallet files Wallet code auto-corrects bit-flips on your hard-drive, and also uses a synchronous backup wallet scheme that guarantees no matter which nanosecond the power goes out, your wallet will never be corrupted (or automatically recovered if it does).
• Maintain offline wallets for 100% security from online attackers. You can use Groestlcoin Armory to create a wallet on a computer that will never touch the internet again, and then make a watching-only copy to use on the internet computer. You can monitor transactions online, and sign transactions offline without needing the blockchain. And since it doesn't need the blockchain, even a computer with 512 MB of RAM can be used as the offline system.
• Import addresses created with VanityGen or sweep funds from paperwallets. Import trusted private keys into your wallets, or just "sweep" the funds to another address in your wallet. Supports private keys in hex, base58, and mini-private-key format used on Groestlcoin Address Utility.
• Toggle between "Standard", "Advanced", and Expert modes to guarantee an appropriate set of options and information. Choose between "Standard", "Advanced" and "Expert", to scale the functionality according to your experience level. "Standard" user mode has a reduced set of functionality and only presents information necessary for basic wallet management and transactions. "Advanced" and "Expert" modes have a plethora of extra options and information that most users don't need or want.
• Ability to add "Watching-Only" Wallets. "Watching-only" wallets can be used generate addresses and confirm incoming payments, but cannot spend the money. Keep the full wallet on an offline computer, and maintain it safely from the online computer. Or create a master wallet for your business, and give a watching-only copy to your employees to do business. It's impossible for a hacker (or employee) to steal your Groestlcoins if your private keys are on a computer that never touched the internet!
• SecurePrint for all Backup Types. Print a paper backup of your wallet on one sheet of paper, and keep it in a book on your bookshelf, in a safe, or drop it in a safe-deposit box at your bank. Paper wallets are superior to digital media, because paper is cheap, easy to store, and you can verify the integrity of the backup by eye. If you backup your wallet to a USB key, how do you know that it will still work when you plug it in two years from now? If you can read the characters on the paper backup, you can recover all the funds you ever received to it!
• Developer-Friendly! Thoroughly-commented Python code. Thoroughly-commented C++ code. Thousands of lines of unit-test code for verifying almost every sub-function of the entire library. Simple wallet files. And the "Developer" user mode will give you everything you could possibly need to help you with your own development: browse the blockchain, examine tx scripts, etc.
• Multi-wallet interface: Manage as many wallets as you want simultaneously. Groestlcoin Armory was designed from the start for multi-wallet operations without limit on number.
• Deterministic wallets: Your entire wallet is recoverable from only the root address and a "chaincode." You only need to backup your wallet once, and your funds will be safe forever. (NOTE: if you have imported private keys, consider using the "Backup Individual Keys" dialog instead --you can backup both the root key & chaincode, along with the raw private key data for imported keys, all in one screen).
• One-time-only Backups: Did you know that you need to backup your Groestlcoin Core wallet every 100 addresses? This is a dangerous and unnecessary burden for most users. With Groestlcoin Armory, regardless of whether you make a paper backup or digital backup, it will be good forever. Do it once (though, maybe multiple copies). Store it safely. Never worry again about whether your coins are protected against hard-drive failure.
• Get your private keys! There is no database software obscuring key data. All keys are stored in a straightforward binary wallet format, and easily extractable. If you want to switch to another wallet application, you can simply "Backup Individual Keys" and import them into the other wallet.
• Decentralized Multi-Signature "Lockboxes" (up to 7-of-7)
• Daemon/API for Services and Network Integration
• Message Signing
• Fragmented (M-of-N) Backups

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 use MultiSig?
4. Can you sweep private keys?
5. Can you verify and sign messages?
6. Can you broadcast Raw transactions?
7. Can you use the EC Calculator?
8. Can you export transactions?
9. Can you export log files?
10. Does it work with Tor?
11. Does the default URL handler work?
12. Can you import private keys?
13. Can you filter your wallets?
14. Can you watch your transactions on the block explorer?

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 errors in this topic.

Important:
Groestlcoin Armory uses a filename .wallet instead of wallet.dat (like in Groestlcoin Core). Back up your files by making a copy of it and moving it to a secure location.
The multi-signature addresses starts with a "3" and not with a "F".
• Location Windows: Navigate to C:\Users\USER NAME\AppData\Roaming\GroestlcoinArmory (or open windows explorer and enter %appdata%\GroestlcoinArmory) and back up your .wallet file by making a copy of it and moving it to a secure location.
• Location Mac: Navigate to ~/Libarary/Application Support/GroestlcoinArmory and back up your .wallet file by making a copy of it and moving it to a secure location.

You can download it using the links below:
Download Windows Wallet here: https://github.com/GroestlCoin/GroestlcoinArmory/releases/download/v0.93.99.1/GroestlcoinArmory_x64.msi
Download the OSX DMG Wallet here: https://github.com/GroestlCoin/GroestlcoinArmory/releases/download/v0.93.99.1/groestlcoin-armory_osx.tar.gz
Compile the Linux wallet: https://github.com/GroestlCoin/GroestlcoinArmory#building-groestlcoin-armory-from-source

Source code:
https://github.com/GroestlCoin/GroestlcoinArmory

Groestlcoin Easyminer has been updated to v2.0. Groestlcoin Easyminer is a software package designed to remove all the painstaking, torturous technological spellcastings an average person feels they have to perform in order to mine Groestlcoin. The Easy Miner package includes the latest auto-tuning mining software for Groestlcoin and Electrum-GRS wallet for fast and easy access to mined coins.

If you want an easy miner with no massive hunting for proper configuration files based on their GPU model then Groestlcoin Easyminer is the right choice for you.

Changelog EasyMiner 2.0:
• New GUI
• Mining is logged into the GUI
• Removed CPU thread-setting support (see next change)
• Now mines on GPU if support is available otherwise CPU (instead doing both)
• Comes now with an installer
• Ccminer support for Nvidia cards (instead with Sgminer)
• Branded with Groestlcoin logo
• Fixed GPU and 64 bit CPU mining support over initial version of Easyminer-GUI
• Fixed GPU logging over initial version of Easyminer-GUI
• Now installs a shortcut so rather than relying on a "run me" file
• Tweaked timings on installation instructions to be a bit smoother
• Changed some wordings in the miner to better work the features it has

Features
• Built-in autotuning mechanism - auto-tunes itself on the fly according to the user's CPU or GPU capacities
• No searching for pools and figuring out how to join
• No need to edit bat files
• No hours of loading of their Groestlcoin wallet before they can use it or start seeing payments come in
• Excellent support - It works with all cpu's and gpu's
• Real easy - One file to click at
• The program prompts the user to update their latest video card drivers (if necessary)
• No knowledge needed of how mining works
• Free and decentralised - Open Source

It is appreciated if feedback of the following is provided:
1. Are you able to mine Groestlcoin with your cpu?
2. Are you able to mine Groestlcoin with your AMD graphic card?
3. Are you able to mine Groestlcoin with your nVidia graphic card?
4. Are you receiving coins in your wallet?
5. Does the autotuning feature work properly?

There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app or damage your CPU/GPU, 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.

Important:
Store your secret phrase somewhere safe!
Electrum-GRS creates an encrypted filename default_wallet instead of wallet.dat (like in Groestlcoin Core)
• Location of your wallet: 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.

Download the Groestlcoin Easyminer installer here: https://github.com/GroestlCoin/Groestlcoin-Easyminer/releases/download/2.0/GroestlcoinEasyminer.exe

Source code: https://github.com/GroestlCoin/Groestlcoin-Easyminer

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Wallet

After adapting our latest Groestlcoin Android wallet (v0.24) to Blackberry, the Groestlcoin Blackberry wallet beta (v0.24) is ready for testing.
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.

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

Groestlcoin Address Utility allows a user to do various useful functions with Groestlcoin addresses, such as convert them between various formats, encrypt and decrypt them, and print them as paper wallets. This program is written in C# and is based on Microsoft's .NET / Visual Studio toolchain. Groestlcoin Address Utility runs natively for Windows, and also runs on Linux and Mac using Mono.

If you need a utility to do all kind of conversions between Groestlcoin hex/address and public/private keys Groestlcoin Address Utility is the right choice for you!

Features:
• Ability to copy Qr code graphic into the clipboard for use with other programs.
• Base58 Calculator allows arbitrary conversions of base58 values to hexadecimal and vice versa, regardless of length.  Add a "?" to the end of any base58 string to suspend verification of the checksum.
• Support for compressed public keys and the ability to convert between compressed and uncompressed.
• A calculator that lets you convert between private and public keys, hex and base58 Groestlcoin addresses.
• Bulk Groestlcoin address generator
• Paper wallet printer
• Decrypter for encrypted private keys
• Self-escrow utility
• Intermediate code generator (used for creating encrypted paper wallets)
• Physical Groestlcoin insert printer (the small round private key paper found in physical Bitcoins)

Groestlcoin Address utility screen:
Create new Groestlcoin addresses with corresponding minikey and standard private key formats
Copy Groestlcoin addresses and private keys to the clipboard as QR code images
Convert minikeys to WIF/hexadecimal private key formats
Create private keys from text strings via groestl hash ("brainwallet")
Convert between hexadecimal and WIF private key formats
Decrypt/encrypt private keys per BIP 0038
Calculate public key from private key
Calculate compressed/uncompressed equivalents for public keys
Confirm that public keys are valid (i.e. that they represent a valid EC curve point)
Calculate Hash160 from public key
Calculate Groestlcoin address
View balance on block explorer

Base 58 Calculator screen:
The Base58 calculator screen allows quick conversions between the Base58 encoding commonly used in Groestlcoin-related objects and the encoded hexadecimal equivalent. This screen is especially useful for discovering what hexadecimal prefix is required to create Base58 strings with a specific prefix, or for seeing what is encoded in non-standard Base58 strings generated by service providers.
The 32-bit checksum is verified on all Base58 entries, and "invalid" is displayed in the hex box if the checksum is incorrect. However, verification of the checksum can be skipped simply by appending a question mark (?) to the end of the Base58 string. Once the hexadecimal equivalent is known, simply making an insignificant change to the hex box (such as adding a space to the end) will result in the correct checksum being recomputed and displayed.
If "invalid" is still shown after adding a question mark to the Base58 string, it probably contains invalid characters such as 0, O, I, or l.

Key Combiner screen:
The Key Combiner screen allows elliptic-curve arithmetic on Groestlcoin public and private keys. Specifically, multiplication can be used for creating two-factor Groestlcoin addresses, and addition can be used for secure vanity address generation.
The two boxes accept either a public or private key in any recognized format (hexadecimal, WIF, minikey, etc.).
Multiplying or adding two private keys yields a new private key, as well as its corresponding public key and Groestlcoin address.
Multiplying or adding a private key and public key yields a combined public key and Groestlcoin address, but no private key. When the public key input is replaced by the matching private key, then calculating the resulting private key becomes possible.

Two-Factor Groestlcoin Tools:
When you order a 2-factor item, you can protect it with a passphrase which you can convert to an intermediate code. The Intermediate Code preserves enough information about the passphrase to be able to create a public key and 2-factor groestlcoin address from it, but not the private key. The 2-factor system ensures that nobody can redeem the value from the item unless they have the passphrase.

Escrow tools:
Escrow allows two people to transact in Groestlcoin while leaving their funds visible to everybody and accessible to nobody until somebody releases them. It allows the payer or the payee to release funds to one another, and also lets a third person decide for them if the two can't agree.  The third person never has access to take the funds, and is only needed to release the funds if the original two can't agree who gets them.  Whoever gets a copy of all three "invitations" gets access to the funds.

Vanity private keys:
Generate a random address, and then add a question mark to the WIF private key (turns off checksum). Substitute characters. Convert to hex and then back to WIF (which will replace the checksum with a valid one). Once you have a working vanity private key that stays the same no matter which way you convert it, then generate the public key and groestlcoin address from it.

It is appreciated if feedback of the following is provided:
1. Can you generate bulk addresses?
2. Can you use Base58 calculator succesfully?
3. Can you use Key Decrypter succesfully?
4. Can you use Two-factor Groestlcoin Tools succesfully?
5. Can you use Escrow Tools succesfully?
6. Can you copy QR code into other programs?
7. Can you print paper wallets?
8. Can you watch ur addresses on the block explorer?

This application is licensed under the GPLv3 license. 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.

Important:
Save all your private keys before closing the program by copying it and moving it to a secure location. Otherwise all the information will be gone!

Windows:

• Download the installer here https://github.com/GroestlCoin/Groestlcoin-Address-Utility/releases/download/v2.6/groestlcoin-address-utility.msi

Linux:

• Download ZIP archive here https://github.com/GroestlCoin/Groestlcoin-Address-Utility/archive/v2.6.zip.
• Install Mono On Ubuntu: apt-get install mono-complete.
• Set Execution mode for file GrsAddress.exe: chmod +x GrsAddress.exe.
• Run: ./GrsAddress.exe

OS X:

• Download ZIP archive here https://github.com/GroestlCoin/Groestlcoin-Address-Utility/archive/v2.6.zip.
• Download and install Mono for OS X: http://www.mono-project.com/download/.
• Set Execution mode for file GrsAddress.exe: chmod +x GrsAddress.exe.
• Run: mono GrsAddress.exe

Note: ZIP archive contains 3 files: GrsAddress.exe BouncyCastle.Crypto.dll ThoughtWorks.QRCode.dll

Source code: https://github.com/GroestlCoin/Groestlcoin-Address-Utility