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MultiGroestl is a lightweight "thin client" Groestlcoin wallet for Windows, MacOS and Linux based on groestlcoinj. Its main advantages over the original Groestlcoin client include support for opening multiple wallets simultaneously, and not requiring the download of the entire block chain.

If you are an ordinary user of Groestlcoin and simply want a wallet that just works without hassle, then MultiGroestl is the right choice for you.

Features
• Multiple wallets can be open at the same time
• Quick and easy to install across all major desktop operating systems (Windows, Mac, Linux)
• Secure by design - all private keys are kept encrypted on your local machine (or on a USB stick)
• Faster - Synchronizes with the network by downloading the block headers only very quickly
• Lighter - It does not require a new user to download the entire Groestlcoin chain and store it
• Easy - no need to search for extra nodes and edit the conf file
• Shows the last GRS to fiat rates from Poloniex
• Import and export your private keys
• Chart of your balance over the last 30 days
• Free and decentralised - Open Source under MIT license
• International - multiple languages

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.  Does the graphic view work for you?
5.  How long does it take to sync the blockchain?
6.  Does it appear in your language?
7.  Does it calculate exchange rates properly?

If the blockchain does not synchronise or is stuck, simply go to Tools - reset Blockchain and Transactions.  The app will synchronise very fast (there is no need for closing the program). 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:
MultiGroestl uses a filename multigroestl.wallet instead of wallet.dat (like in Groestlcoin Core)
• Location Windows: Navigate to C:\Users\USER NAME\AppData\Roaming\multigroestl (or open windows explorer and enter %appdata%\MultiGroestl) and back up your multigroestl.wallet file by making a copy of it and moving it to a secure location.
• Location Mac: Navigate to ~/Libarary/Application Support/multigroestl and back up your multigroestl.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://mega.co.nz/#!74llBIjY!4nQWHuEAMg1ndP1SHlsQ24Yf09greVCIo2qvu4XpDqE
Download the OSX DMG Wallet here: https://mega.co.nz/#!WkkllTBS!d_DSbixYPi38hPx84UBTmrQi05anfrgkgxc5hlgrpcc
Download the Windows Wallet here: https://mega.co.nz/#!LkFRiQSI!mR3JXUMiqUbLeMgOASIfKfaqcHHfZFEWv2zg5VVtMq0

Source code:
https://github.com/GroestlCoin/groestlcoinj-mb-alice - Groestlcoin Java Library for MultiGroestl
https://github.com/GroestlCoin/MultiGroestl - The Multigroestl Wallet Source code

[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.

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 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 servers are decentralized and redundant. Your wallet is never down.
• Proof Checking - Electrum 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 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.  Can you scan a QR code from another phone.
4.  Does the cosigner pool work when using a multi-signature wallet?
5.  Does the virtual keyboard work when it asks to enter your wallet password?
6.  Does it automatically detect electrum1.groestlcoin.org and electrum2.groestlcoin.org under Tools - Network?
7.  Are you able to sweep private keys?

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 ~/Libarary/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 DMG Wallet here: https://github.com/GroestlCoin/electrum-grs/releases/download/v2.0.3/Electrum-grs-2.0.3.dmg
Download Windows Wallet here: https://github.com/GroestlCoin/electrum-grs/releases/download/v2.0.3/Electrum-grs-2.0.3-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-server
Github Source client: https://github.com/GroestlCoin/electrum

A BIP-0032 compatible Hierarchical Deterministic Groestlcoin Wallet

After a measure of hard work adapting the latest Bitcoin wallet (v4.14) for Android to Groestlcoin, the Groestlcoin Android wallet beta (v0.20) 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 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/HashEngineering/groestlcoinj - Groestlcoin Java Library (for the Android App and possibly other software)
https://github.com/HashEngineering/groestlcoin-wallet - The Groestlcoin Android Wallet Source code

[The multipool is only for AMD GPU's]

Welcome to the Groestlcoin Multipool

We mine the most profitable Groestl/myriad-groestl base coin and pay out in Groestlcoin/Bitcoin.
Boostpool is the first multipool that pays out in Groestlcoin. The multipool is only for AMD GPU's. We select the most profitable groestl/myriad-groestl altcoin and mine it, converting the earnings to GRS before sending them to your wallet. If you pay a lot for electricity this could be a better option. Hopefully, this will support Groestlcoin by creating much needed volume on crypto exchanges. All you have to do is point your miner to the pool and we take care of the hard work!

Important Points
•No registration required, all you have to do is use your Groestlcoin/Bitcoin address as your username, just like P2Pool
•Stratum + Vardiff
•Automatically sets proper difficulty multiplier (not required to write --difficulty-multiplier 0.0039062500 anymore)
•Thread-concurrency and lookup-gap parameters are not used anymore
•No coin switch downtime (the miner can switch from Groestl to Myriad-groestl on the fly)
•Daily manual payouts
•High performance Node.js backend
•EU based
•DDOS protected

How To Mine
•Boostpool.com require different/specialized mining software called grs-sgminer, so your standard sgminer will not work. Grs-sgminer is a OpenCL optimized miner for coins using Groestl and MyriadGroestl algo. Download: https://github.com/BoostPool/boost-sgminer/releases/download/1.4.0/grs-sgminer1_4_0.zip
•Simply point your miner to stratum+tcp://boostpool.com:3333 with your GRS/BTC payout address as your username and any password. Remember this pool mines groestl/myriad-groestl and will show the hashrate scaled in scrypt to compare profitablity!

Code Select Expand

code:sgminer -o stratum+tcp://boostpool.com:3333 -u YOUR_WALLET_ADDRESS -p YOUR_EMAIL_ADDRESS -I 20 --gpu-engine 1100 --gpu-memclock 150 --gpu-fan 100

Current Coins
•Digibyte (DGB)
•Myriadcoin (MYR)
•Saffroncoin (SAF)

Why choose a NOMP pool?
•It's safer than a normal Pool. Cause you do not need to give any personal info such email or passwords.
•It's faster: point your miners, set your address in your miner config and get profit.
•It's lighter for your internet connection than normal MPOS pool.

The Groestl algorithm used in Groestlcoin does not give the GPUs a large advantage over CPUs. These are instructions to CPU mine Groestlcoin on a pool with Windows and have the shares deposited to the client/wallet on your computer.

You must have a 64-bit operating system in order to use the CPU miner. If you don't know what version you have, check on this Microsoft page.

CLIENT INSTALL – The best source for the client/wallet is the Groestlcoin website.
1.1. Download the Windows wallet and install it.
2.2. Run the client.
3.3. The client needs to synchronize with the network. Leave it open and continue to the next section.

JOIN A POOL – Most pools are based on the MPOS software so the signup and setup are very similar. Ypool is totally different and will not work using these instructions. The current list of pools can be found on the Groestcoin website's Pools and Mining page.

1. Go to the pool's front page and click on the "Sign Up" link on the left menu.
2. Enter the information to create your account. Some pools require email confirmation while others do not.
3. Login to the pool and click on the "Workers" link on the left menu.
4. You must create a worker for each mining program you use, even if they are on the same computer. The worker password can be anything. You don't need a secure password for the worker.

DOWNLOAD MINER – The most recent version of the CPU miner for Groestlcoin is the Yam M7r by yvg1900. There are many versions available for the different operating systems and CPU architecture combinations. Since you already know the operating system is Win64, you just need to figure out the correct CPU architecture.

1. Determine the CPU you have. If you don't know to do that, check here.
2. Next, figure out the architecture that CPU uses. Go to CPU-World and search for your CPU. In the page for your CPU, you should find the architecture.
3. Go to the download directory on MEGA.
4. Find the correct ZIP for for your architecture and download. Extract everything to a folder.

SETUP MINER – Once you have the correct miner, you can configure the settings.

1. In the main folder, there are many text documents. These are the Read Me files and configuration files. Find the file named 'yam-grs.cfg' and move into the sub-directory named 'win64-<architecture>' where architecture is the one for your CPU.
2. Enter that sub-directory and right-click 'yam-grs.cfg.' In the menu that appears, click on Edit and the file should open in Notepad.
3. Delete everything and then paste this in there:
threads = 0
mining-params = grs:av=0&donation-interval=50
mine = stratum+tcp://USERNAME.WORKER:PASSWORD@POOL-ADDRESS:PORT/grs
compact-stats = 1
print-timestamps = 0
4. Replace USERNAME, WORKER, PASSWORD with the worker info you created on the pool.
5. Replace POOL-ADDRESS and PORT with the info from your pool's Getting Started page.
6. Save the file and exit Notepad.
7. Right-click in a blank area of the folder. In the menu that appears, hover the mouse over New and a second menu will appear. Select Text Document.
8. A new file named 'document.txt' will be created.
9. Double-click on the file. You should have Notepad open with a blank document.
10. Paste this into notepad:
yam --config yam-grs.cfg
pause
12. In Notepad click on File and then Save As.
14. Enter "mine.bat" as the File name (include the quotes). Change Save as type to All Files.
15. Click Save.
16. Double-click on the mine.bat file to start mining.

SETUP PAYOUTS – This is VERY important. You need to setup automatic payouts so the pool automatically sends your mined coins to your wallet. The pool is not an online wallet and can be hacked at any time.

1. Go to the wallet you installed earlier and click on the Receive tab. Right click on the address and click Copy Address.
2. Go to the Pool website and click on "Edit Account."
3. Paste the address in the "Payment Address" field. Set the "Automatic Payout Threshold" to the lowest number if you are only CPU mining.
4. Enter the PIN you chose during signup in the field "4 Digit PIN" and then click on Update Account.

Assuming all went well, you should be CPU mining now. If there is a mistake with the directions, you can let me know via the Contact Form. If you need help with your setup, please ask in the announce thread.

Source: http://cpucoinlist.com/how-to/cpu-mine-groestlcoin/

need more people follow it 

Do you have qq group international? If so, add Groestlcoin QQ Group: 9999618. There are 180 members there who can follow it and recruit new people.

Hello from me my name is Klara, I'm new here!

Welcome!

Can u share us your story how did you found Groestlcoin?

Hello !
I'm a newbie...!
I found Groestlcoin by looking around on the internet and compared it to other algo in testing with my mining rigs. What suprise me is the low cost on electricity. I D'ont understand why it is not more popular. I know it's been only a few months, it takes time for a coin to get known but this one is superb....!!!
Congrat too gruve_p for giving birth to this coin.!

rasta.

Hi rasta,

we have the most energy efficient algo. We don't have much exposure thats why it is not so popular. We have assembled a new team and will be announced shortly to give more exposure.

Thank you for mining this coin.

gruve_p

Welcome and enjoy the ride with us.
I see you are doing a good job with incognitocoin. I hope the relaunch goes well so u can concentrate more on us.

Looking forward to work with you.

Hello all,

I will be in charge of the community management of Groestlcoin.

You will soon be seeing me on the Bitcointalk forums as well.

My name on Bitcointalk is: neutraLTC

Thanks and looking forward to working with all of you!

[not dropping but replacing]

- if you  replace Groestlsend with  " Polymorphic code to resist Asic " the code change to make impossible for asic , will be good idea not dropping but replacing (people has psychological by droping =    ) , i am not programmer i don't know  if this idea is possible but in computer nothing is impossible .
Somme Innovation do not kill!!!

Let me elaborate:
Asic resistance/anti asic is not a reason to buy/sell Groestlcoin, it's a reason to mine.
If a coin matures, they will get ASICs as an ASIC is just a purpose specific computer and they can always outperform general purpose computers. There are Asics for Sha256, Scrypt, Scrypt-N and X11 at this moment. Also using Groestl isn't FPGA resistant because X11 has ASICs and uses groestl as one of its algos. Single algorithms are NOT ASIC resistant and will never be. If a coin is succesfull enough then company's will make asics for it, period.

We never said we don't like innovation but we need to find our OWN niche not try and cash in on other niches.

hi , groestlcoin need accelerated software development Thant just marketing in sites,
if possible:

- android wallet.
- multipool ( Sgminer5 with multi algorithms).
- Groestlsend _ if you can implement as beta _.

We are working on a multipool and android wallet. We dropped Groestlsend

This will help us better distribute hashes and secure the network

Overview:
http://p2pools.org/grs

p2pools:
grs.altmine.net
p2poolcoin.com
ca.p2poolcoin.com