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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

[BIP66 soft fork]

BIP66 soft fork
Version 2.11.0 of Groestlcoin core fixes very important common vulnerabilities and exposures (classified as CVE-2015-3641) and all users MUST upgrade to this version as soon as possible. Deamons and QT wallets that are derived from Bitcoin and have a codebase prior to Bitcoin 0.10.2 needs to address this CVE as soon as possible.
To address this CVE, Groestlcoin used the BIP66 soft fork. The majority of the Groestlcoin miners have already upgraded to the latest version of Groestlcoin Core which activated the new BIP66 consensus rule. This soft fork was a two stage process where certain thresholds have been reached, consisting of the following conditions:

• Once 75% of the last 1000 blocks are version 3, strict DER encoding for signatures will be enforced when new blocks are generated, preventing non-standard transactions from being included in them.
• Once 95% of the last 1000 blocks are version 3, propagation of version 112 (aka 1) and version 2 blocks will be rejected from the network entirely.

Users
From a users perspective, the change will be seamless and is purely a backed change. Older version (v2.1.0.6) is still compatible with the network, however it is extremely important that you upgrade to version 2.11.0 (link) if you haven't done so already due to the security fixes, new features and privacy enhancements.

Miners
If you're a miner, below you will find a list of the pools who have upgraded and the ones who haven't. If you're a miner on a pool which hasn't upgraded yet, please temporarily move your hashing power to another pool until they have upgraded otherwise mining version 112 (aka 1) blocks will be orphaned and you will generate no revenue.

The following pools have upgraded and enforce the new rules:
Coinmine.pl
Dwarfpool
Miningpoolhub
Suprnova

The following pools have not yet upgraded:
Coin-base
Please note that we will update this list as soon as any there are any updates.

The 75% threshold value was reached in approximately 6 days. The 95% threshold value was reached in approximately 10 days. As of last week the Groestlcoin network BIP66 soft fork is completed.

Bitcoin BIP66 Fork Incident
Bitcoin's BIP66 enforcement lead to a fork of the network once the 95% threshold had been reached. This was caused by mining pools representing half the hashing power of the network not validating blocks properly due to SPV mining, despite publishing v3 blocks and building on top of an invalid block leading to a 6 block deep fork. After the issue was identified, the miners corrected the issue and a block reorgonisation took place, orphaning the invalid fork.
We have discussed this issue with various pools and have confirmed that full validation nodes are being used. Despite this, we have been monitoring the network to make sure any issues were promptly dealt with. More details about the incident can be found here.

Double Groestl:
Block headers
Message
Address
Alert Messages
OP_HASH256

Single SHA256:
Message Signing
Transactions
Transaction Signatures

Double SHA256:
MerkleRoots
BIP38

Mainnet:
Groestlcoin pubkey hash (P2PKH address) lead Symbol = F
Groestlcoin pubkey hash (P2PKH address) lead Hex value = 0x24
Groestlcoin pubkey hash (P2PKH address) lead Decimal = 36
Groestlcoin Script hash (P2SH address) Lead Symbol = 3
Groestlcoin Script hash (P2SH address) Hex value : 0x05
Groestlcoin script hash (P2SH address) Decimal : 5
Groestlcoin uncompressed private key lead Symbol = 5
Groestlcoin uncompressed private key lead Hex value = 0x80
Groestlcoin uncompressed private key lead Decimal = 128
Groestlcoin compressed private key lead Symbols = K or L
Groestlcoin compressed private key lead Hex value = 0x80
Groestlcoin compressed private key lead Decimal = 128
Groestlcoin BIP32 pubkey lead symbol = xpub
Groestlcoin BIP32 pubkey Hex value: 0x0488b21e
Groestlcoin BIP32 pubkey Decimal: 4 136 178 30
Groestlcoin BIP32 private key lead Symbol = xprv
Groestlcoin BIP32 private key Hex value: 0x0488ade4
Groestlcoin BIP32 private key Decimal: 4 136 173 228
Groestlcoin NetworkMagic Hex value: 0xf9beb4d4
Groestlcoin NetworkMagic bytes = \xF9\xBE\xB4\xD4
Groestlcoin hrp = grs
P2P port: 1331
RPC port: 1441
Groestlcoin Genesis hash hex = 0x00000ac5927c594d49cc0bdb81759d0da8297eb614683d3acb62f0703b639023
Groestlcoin Genesis hash =
Groestlcoin Genesis tx hash hex = 0x3ce968df58f9c8a752306c4b7264afab93149dbc578bd08a42c446caaa6628bb
Groestlcoin Genesis tx hash =

Testnet:
Groestlcoin pubkey hash (P2PKH address) lead Symbol = m or n
Groestlcoin pubkey hash (P2PKH address) lead Hex value = 0x6F
Groestlcoin pubkey hash (P2PKH address) lead Decimal = 111
Groestlcoin Script hash (P2SH address) Lead Symbol = 2
Groestlcoin Script hash (P2SH address) Hex value : 0xC4
Groestlcoin script hash (P2SH address) Decimal : 196
Groestlcoin uncompressed private key lead Symbol = 9
Groestlcoin uncompressed private key lead Hex value = 0xEF
Groestlcoin uncompressed private key lead Decimal = 239
Groestlcoin compressed private key lead Symbols = c
Groestlcoin compressed private key lead Hex value = 0xEF
Groestlcoin compressed private key lead Decimal = 239
Groestlcoin BIP32 pubkey lead symbol = tpub
Groestlcoin BIP32 pubkey Hex value: 0x043587CF
Groestlcoin BIP32 pubkey Decimal: 4 53 135 207
Groestlcoin BIP32 private key lead Symbol = tprv
Groestlcoin BIP32 private key Hex value: 0x04358394
Groestlcoin BIP32 private key Decimal: 4 53 131 148
Groestlcoin NetworkMagic Hex value: 0x0b110907
Groestlcoin NetworkMagic bytes = \x0B\x11\x09\x07
Groestlcoin hrp = tgrs
P2P port: 17777
RPC port: 17766
Groestlcoin Genesis hash hex = 0x000000ffbb50fc9898cdd36ec163e6ba23230164c0052a28876255b7dcf2cd36
Groestlcoin Genesis hash =
Groestlcoin Genesis tx hash hex =  0x3ce968df58f9c8a752306c4b7264afab93149dbc578bd08a42c446caaa6628bb
Groestlcoin Genesis tx hash =   

Regtest:
Groestlcoin pubkey hash (P2PKH address) lead Symbol = m or n
Groestlcoin pubkey hash (P2PKH address) lead Hex value = 0x6F
Groestlcoin pubkey hash (P2PKH address) lead Decimal = 111
Groestlcoin Script hash (P2SH address) Lead Symbol = 2
Groestlcoin Script hash (P2SH address) Hex value : 0xC4
Groestlcoin script hash (P2SH address) Decimal : 196
Groestlcoin uncompressed private key lead Symbol = 9
Groestlcoin uncompressed private key lead Hex value = 0xEF
Groestlcoin uncompressed private key lead Decimal = 239
Groestlcoin compressed private key lead Symbols = c
Groestlcoin compressed private key lead Hex value = 0xEF
Groestlcoin compressed private key lead Decimal = 239
Groestlcoin BIP32 pubkey lead symbol = tpub
Groestlcoin BIP32 pubkey Hex value: 0x043587CF
Groestlcoin BIP32 pubkey Decimal: 4 53 135 207
Groestlcoin BIP32 private key lead Symbol = tprv
Groestlcoin BIP32 private key Hex value: 0x04358394
Groestlcoin BIP32 private key Decimal: 4 53 131 148
Groestlcoin NetworkMagic Hex value: 0xfabfb5da
Groestlcoin NetworkMagic bytes = \xFA\xBF\xB5\xDA
Groestlcoin hrp = grsrt
P2P port: 18888
RPC port: 18443
Groestlcoin Genesis hash hex = 0x000000ffbb50fc9898cdd36ec163e6ba23230164c0052a28876255b7dcf2cd36
Groestlcoin Genesis hash =
Groestlcoin Genesis tx hash hex =  0x3ce968df58f9c8a752306c4b7264afab93149dbc578bd08a42c446caaa6628bb
Groestlcoin Genesis tx hash =   

Signet:
Groestlcoin pubkey hash (P2PKH address) lead Symbol = m or n
Groestlcoin pubkey hash (P2PKH address) lead Hex value = 0x6F
Groestlcoin pubkey hash (P2PKH address) lead Decimal = 111
Groestlcoin Script hash (P2SH address) Lead Symbol = 2
Groestlcoin Script hash (P2SH address) Hex value : 0xC4
Groestlcoin script hash (P2SH address) Decimal : 196
Groestlcoin uncompressed private key lead Symbol = 9
Groestlcoin uncompressed private key lead Hex value = 0xEF
Groestlcoin uncompressed private key lead Decimal = 239
Groestlcoin compressed private key lead Symbols = c
Groestlcoin compressed private key lead Hex value = 0xEF
Groestlcoin compressed private key lead Decimal = 239
Groestlcoin BIP32 pubkey lead symbol = tpub
Groestlcoin BIP32 pubkey Hex value: 0x043587CF
Groestlcoin BIP32 pubkey Decimal: 4 53 135 207
Groestlcoin BIP32 private key lead Symbol = tprv
Groestlcoin BIP32 private key Hex value: 0x04358394
Groestlcoin BIP32 private key Decimal: 4 53 131 148
Groestlcoin NetworkMagic Hex value: 0x6f892b8f
Groestlcoin NetworkMagic bytes = \x6F\x89\x2B\x8F
Groestlcoin hrp = tgrs
P2P port: 31331
RPC port: 31441
Groestlcoin Genesis hash hex = 0x0000007fcaa2a27993c6cde9e7818c254357af517b876ceba2f23592bb14ab31
Groestlcoin Genesis hash =
Groestlcoin Genesis tx hash hex =  0x3ce968df58f9c8a752306c4b7264afab93149dbc578bd08a42c446caaa6628bb
Groestlcoin Genesis tx hash =

[Important: • 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.• Encrypt your wallet. This can be done by clicking the settings menu from inside the wallet. Make sure your password is secure and do not forget it. • Make a copy your wallet.dat file as a backup and move it to a secure location:Location Windows: Navigate to C:\Users\Username\AppData\Roaming\groestlCoin\wallet.dat (or open windows explorer and enter %appdata%\Groestlcoin\wallet.dat)Location Mac: Finder -> Go {Hold Option] -> Library -> groestlcoin -> wallet.dat (~/Library/Application Support/groestlcoin/wallet.dat) WARNING:While this branch has been extensively tested to be compatible with the existing Groestlcoin v2.1.0.6 network there is the possibility that we missed something. BACKUP YOUR GROESTLCOIN DATA DIRECTORY and wallet.dat because after you run v2.11.0 the old v2.1.0.6 version is no longer compatible with your on-disk data. Without this your node will need start syncing (or importing from bootstrap.dat) anew afterwards. It is possible that the data from a completely synchronised v2.11.0 node may be usable in older versions as-is, but this is not supported and may break as soon as the older version attempts to reindex. Because release v2.11.0 makes use of headers-first synchronization and parallel block download, the block files and databases are not backwards-compatible with older versions of Groestlcoin Core or other software:• Blocks will be stored on disk out of order (in the order they are received), which makes it incompatible with some tools or other programs. Reindexing using earlier versions will also not work anymore as a result of this.• The block index database will now hold headers for which no block is stored on disk, which earlier versions won't support.]

A new major Groestlcoin Core version 2.11.0 is now available for download bringing both new features and bug fixes, so it is recommended to upgrade to it if you are running a full Groestlcoin node or a local Groestlcoin Core wallet.

v2.11.0 is now the official release version of Groestlcoin Core. On top of the new features, this update contains very important security fixes and all users MUST upgrade to this version as soon as possible. Pool operators, P2Pool and solo miners especially, as once BIP 66 is enforced, blockversion 112 (aka 1) and blockversion 2 will be rejected from the network entirely and only blockversion 3 will be accepted.

What's new in version v2.11.0?
This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin v0.11.0 but with Groestlcoin specific patches. On a general level, most of what is new is is hidden where block synchronization and various internals are considerably faster and more efficient, and it has several major privacy improvements.  The most significant changes include:
• Qt dependency changed. Version upgraded to 5.5.
• OpenSSL dependency changed. Version upgraded to 1.0.2a (19 March 2015).
• BerkeleyDB dependency changed. Version for Windows and MAC upgraded to 5.3.21 (11 May 2012).
• Protocolversion changed to 70002
• Blockversion 112 interpreted as version 1. All new blocks will have blockversion 3, but v2.11.0 clients will also accept blockversion 1 (v112) and blockversion 2 blocks until 95% of all blocks will be blockversion 3. After this moment all blockversion 1 and blockversion 2 will be rejected.
• All possible languages added.
• New alert keys added.
• Canonical name for .GroestlCoin in UNIX changed to use all lowercase: .groestlcoin.
• Extra main seeds added.
• New testnet created.
• Comes now with a installer.
• Transaction-URL support of third parties blockexplorers.
• Coin control support.
• Ability to open Groestlcoin URI or payment request.
• Ability to spent unconfirmed coins.
• Ability to see receive and send addresses.
• Groestlcoin-cli. Another change in the v2.11.0 release is moving away from the groestlcoind executable functioning both as a server and as a RPC client. The RPC client functionality ("tell the running groestlcoin daemon to do THIS") was split into a separate executable, 'groestlcoin-cli'.
• Transaction malleability-related fixes
• Autotools build system. For v2.11.0 we switched to an autotools-based build system instead of individual makefiles. Using the standard "./autogen.sh; ./configure; make" to build Groestlcoin-Qt and Groestlcoind makes it easier for experienced open source developers to contribute to the project.
• Rebranding to Groestlcoin Core. To reduce confusion between Groestlcoin-the-network and Groestlcoin-the-software we have renamed the reference client to Groestlcoin Core.
• OP_RETURN and data in the block chain support.
• Standard script rules relaxed for P2SH addresses.
• Watch-only wallet support. This allows the wallet to track transactions to and form wallets for which you know the address of but do not have the private key to.
• Memory usage optimization. There have been many changes in this release to reduce the default memory usage of a node.
• Experimental support for big-endian CPU architectures was added in this release.
• Privacy: Stream isolation for Tor. This release adds functionality to create a new circuit for every peer connection, when the software is used with Tor.
• Privacy: Disable wallet transaction broadcast
• Block file pruning for nodes (without wallet). This release supports running a fully validating node without maintaining a copy of the raw block and undo data on disk. Pruning is disabled by default.
• Faster blockchain synchronization due to headers-first synchronization and support for downloading blocks in parallel. Downloading the blockchain is now much quicker and can be completed within a half hour instead of taking hours for some users.
• A REST interface which allows unauthenticated access to public node data when the -rest flag is specified.
• RPC Server "Warm-Up" Mode which starts earlier than previous versions. This helps users or services relying on it know that the server has already started and will be available soon.
• Improved signing security. This is due to using the libsecp256k1 library for signing instead of OpenSSL. libsecp256k1 is a cryptographic library optimized for elliptic curve uses which Groestlcoin relies on and was created by Bitcoin Core developer Pieter Wuille. Featuring better security, via hardening against timing leaks and derandomization, this library is believed to be better tested and more thoroughly reviewed than the implementation in OpenSSL.
• Improved algorithm used for fee estimation. This release automatically estimates how high a transaction fee (or how high a priority) transactions require to be confirmed quickly.
• Consensus library. Starting from v2.11.0, the Groestlcoin Core distribution includes a consensus library. The purpose of this library is to make the verification functionality that is critical to Groestlcoin's consensus available to other applications, e.g. alternative node implementations.
• New utility applications including groestlcoin-tx for transaction related functionality and groestlcoin-cli for RPC command line functionality as groestlcoind no longer accepts them.
• Strict DER encoding for signatures (BIP 66). This introduces block version 3 and a new consensus rule which prevents non-standard transactions from being included in blocks. This also removes the dependency on OpenSSL's signature parsing. Eventually, libsecp256k1 will be used for all consensus related tasks, depreciating the need for OpenSSL entirely.
• RPC Access Changes. RPC access now supports binary network addresses. This means that you can specify a single IP address, a CIDR network address or a netmask for accessing the RPC service. Please note, wildcard string matching no longer works and will display an error in the debug.log file when you attempt to use use a wildcard string in the rpcallowip= variable, either as a config setting or launch parameter. Note: IPv6 addresses can also be used.
• Added option -alerts' to opt out of the network alert system. Please note that disabling network alerts should only be used by power users as this system is used for network emergencies and important security releases. The default behavior is that network alerts are enabled.
• Detect and reject LibreSSL. This prevents a non-approved SSL library being used for compiling Groestlcoin Core, preventing potential consensus compatibility issues.
• Improved getbalance RPC functionality to allow the user to display zero confirmation transactions (this works with watch-only addresses as well).

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 view your transaction on a third party blockexplorer (restart the client after entering the url of the blockexplorer) ?
4. Can you use the wallet with TOR?
5. Are you able to backup your wallet (wallet.dat) file?
6. Are you able to encrypt your wallet (wallet.dat) file?
7. Are you able to use watch-only function?
8. How long does it take to fully synchronize?
9. Are you able to sign/verify messages?
10. Are you able to see you send/receive addresses?
11. Are you able to use the wallet in your local language?

The application may have unfound bugs and problems. Please report using the issue tracker at github:
https://github.com/groestlcoin/groestlcoin/issues

Important:
• 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.
• Encrypt your wallet. This can be done by clicking the settings menu from inside the wallet. Make sure your password is secure and do not forget it.
• Make a copy your wallet.dat file as a backup and move it to a secure location:
Location Windows: Navigate to C:\Users\Username\AppData\Roaming\groestlCoin\wallet.dat (or open windows explorer and enter %appdata%\Groestlcoin\wallet.dat)
Location Mac: Finder -> Go {Hold Option] -> Library -> groestlcoin -> wallet.dat (~/Library/Application Support/groestlcoin/wallet.dat)

WARNING:
While this branch has been extensively tested to be compatible with the existing Groestlcoin v2.1.0.6 network there is the possibility that we missed something. BACKUP YOUR GROESTLCOIN DATA DIRECTORY and wallet.dat because after you run v2.11.0 the old v2.1.0.6 version is no longer compatible with your on-disk data. Without this your node will need start syncing (or importing from bootstrap.dat) anew afterwards. It is possible that the data from a completely synchronised v2.11.0 node may be usable in older versions as-is, but this is not supported and may break as soon as the older version attempts to reindex. Because release v2.11.0 makes use of headers-first synchronization and parallel block download, the block files and databases are not backwards-compatible with older versions of Groestlcoin Core or other software:
• Blocks will be stored on disk out of order (in the order they are received), which makes it incompatible with some tools or other programs. Reindexing using earlier versions will also not work anymore as a result of this.
• The block index database will now hold headers for which no block is stored on disk, which earlier versions won't support.

How to Upgrade?
If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Groestlcoin-Qt (on Mac).
Linux users: Canonical name for .GroestlCoin in Linux is changed to use all lowercase: .groestlcoin. Please make a link as a solution: ln .GroestlCoin .groestlcoin and rename the GroestlCoin.conf to groestlcoin.conf.  And copy over groestlcoind/Groestlcoin-qt.

Download the Windows Wallet (64 bit) here: https://github.com/GroestlCoin/groestlcoin/releases/download/v2.11.0/groestlcoin_x64.msi
Download the Windows Wallet (32 bit) here: https://github.com/GroestlCoin/groestlcoin/releases/download/v2.11.0/groestlcoin_x86.msi
Download the MAC Wallet here: https://github.com/GroestlCoin/groestlcoin/releases/download/v2.11.0/Groestlcoin-Qt.dmg

Source code:
https://github.com/Groestlcoin/groestlcoin
Build instructions for Linux can be found here: https://github.com/GroestlCoin/groestlcoin/blob/master/doc/build-unix.md
Build instructions for OSX can be found here: https://github.com/GroestlCoin/groestlcoin/blob/master/doc/build-osx.md
Build instructions for Windows can be found here: https://github.com/GroestlCoin/groestlcoin/blob/master/doc/build-windows.md

Groestlcoin Multisig is a powerful account management and secure storage tool for Groestlcoin. It features decentralized offline key generation, offline signing, watch-only shared wallets, fast multidevice synchronization, full support for BIP32 (hierarchical deterministic wallets), and general m-of-n multisignature transactions. It has many applications, from secure cold storage for individuals to enterprise-wide accounts that can be deployed and monitored across entire organizations. A Multisig wallet for Windows, MacOS and Linux with the security of a full node.

If you need an interactive desktop application for transacting on the Groestlcoin network supporting m-of-n signature policies and multiuser/multidevice account management Groestlcoin multisig is the right choice for you!

Features
• Groestlcoin Multisig also lets the user configure the wallet to use a local full node such as Groestlcoin-qt and Groestlcoin-wpf.
• Create invoices for your enterprise.
• Accounts can be configured to allow any number of authorised and necessary signatures, dependent on the signing policy a company wishes to implement. For example, a company might create a signing policy with 5 authorised signatures of which a minimum of 3 would be required to broadcast a transaction. Once the required signatures have been obtained, Groestlcoin Multisig broadcasts the transaction to the Groestlcoin network.
• Has no standard public address. The wallet will always use a pay to script hash address (p2sh), even if it is only 1 of 1.
• Feels more like a encryption key management system than a wallet.
• Built atop three custom libraries, CoinCore, CoinQ, and CoinDB, which provide all core functionality for managing Groestlcoin data structures, connecting to peers and handling persistent storage.
• The wallet can support up to 8-of-8 addresses for signing transactions.
• An enterprise level wallet functioning similar to Armory.
• Easy to install - It includes default options for the most common configurations. It has been designed with a logically-organized and uncluttered graphical interface that clearly presents the most important user functions and relevant user data.
• Offers both secure enterprise-level solutions and straightforward single-user account management. From the start it was designed to support shared multisignature account policies using hierarchical deterministic keychains. It supports the best securiry practices in the industry and is rated amongst the most secure wallets by our team. Generate private keychains offline, safely share public keychains, and create joint accounts with m-of-n signature policies. Export private keychains or print them for secure backup.
• Built over a Service-Oriented Architecture (SOA) platform, and fully supports enterprise-wide policies, as well as keychain and account management. It can easily handle a virtually unlimited number of keys, and new accounts can quickly and easily be created and synchronized from many devices.
• Very fast - It is natively compiled C++. It also features simplified payment verification (SPV), eliminating the need to download the full blockchain to achieve network synchronization. For those who desire the security of their own full validation node, can connect to any node that speaks the Groestlcoin protocol.
• No Lock-In - You can export your private keys.
• 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).
• Import and export your private keys or seeds.
• 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.
• No single point of failure - The code is open source and can run with your own local full node.
• Transactions are signed locally - Your private keys are not shared with the server. You do not have to trust the server with your money.
• Free software - Anyone can audit the code.
• Proof Checking - Groestlcoin Multisig verifies all the transactions in your history using full node.
• Cold Storage - Keep your private keys offline, and go online with a watching-only wallet. Sign transactions from a computer that 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. Compact serialization format for unsigned or partially signed transactions, that includes the BIP32 master public key and derivation needed to sign inputs.

Groestlcoin Multisig Concepts
• Vaults - Vaults are files with extension .vault containing accounts, keychains, and transaction history. They can be opened directly in Groestlcoin Multisig and constitute the basic document type that Groestlcoin Multisig can create and edit.
• Keychains - Keychains are collections of private and/or public keys generated deterministically from a master seed using BIP32. They can be imported and exported to and from Groestlcoin Multisig as files with extensions .priv and .pub respectively. Every keychain can be given an arbitrary name and has a hash that is uniquely determined by the master seed and remains fixed.
• Accounts - Accounts are logically grouped collections of deposit addresses generated deterministically from a set of keychains and an m-of-n policy. The account balance consists of all the transaction outputs spendable using the aforementioned keychains subject to the m-of-n policy. Each distinct account contains a separate set of addresses that always remain part of that account. Addresses are generated by using keychain sequences/trees in parallel. Public keys are sorted lexicographically in the redeemscript. Accounts also have a starting timestamp that indicates how far back in the blockchain we should look when scanning for transactions. Shared accounts, a.k.a. watch-only accounts, are accounts that have been stripped of all private keys. They can only be used to monitor transactions, not to spend.

How To use Groestlcoin Multisig:
1. Create a new vault file.
From the File menu, select "New Vault..." – or alternately, click on the toolbar button. You will be prompted to pick a name for your vault file. Create a new folder for your vault files, make sure to use the file extension ".vault" and then save.
2. Create an account by either using the wizard or manually.

USING THE WIZARD (easy)
From the Accounts menu, select "Account Wizard..." – or alternately, click on the button in the toolbar. You will be asked for an account name and an account policy. If you just want a simple account, leave the policy as 1 of 1.
NOTE: Groestlcoin Multisig always uses pay-to-script-hash addresses, which begin with the character 3 in Groestlcoin, even for 1 of 1 accounts.
For multisignature accounts: on the left select the minimum number of signatures required to sign transactions from the account. On the right select the total number of keychains to use for the account. An account will automatically be created for you along with a new set of keychains.

MANUALLY (advanced)
From the Keychains menu, select "New Keychain..." – or alternately, click on the toobar button. You will be prompted to name the keychain. Pick whatever name you want.
Repeat step 2 to create multiple keychains if desired.
Right-click on any keychain in the Keychains tab and select "Export Private Keychain..." to make backups of the keychain. Select "Export Public Keychain..." to export a file you can share with other people or devices that you wish to make part of the account.Using the same menu, select "Import keychain..." to import public or private keychains from file.
Click "New Account" button on toolbar. Check the keychains you wish to use to sign for the account, then select the minimum signatures required. The creation time defaults to your system clock – it is used to determine how far back in the blockchain to scan. Make sure the creation time precedes the first transaction made to the account.

You'll see the new account appear in the Accounts tab. Right-click the account to get a popup menu. Select "Export Account..." to backup the account to file – this backup will include any private keys you have. To export the public watch-only account, select "Export Shared Account..." instead. You'll be able to import this file on another device where you can view all activity with signing functionality completely disabled.

3. Connect to network.
By default, Groestlcoin Multisig will attempt to connect to our Groestlcoin node running on groestlcoin.org. If you don't want to run a full node beside this program, leave this setting alone. If you would prefer to connect to a local Groestlcoin node (i.e. a local running instance of Groestlcoin-Qt or Groestcloin-wpf), you can change the IP address to localhost and port under Network->Settings...(File->Preferences ... on Mac).
NOTE: Groestlcoin Multisig only connects via the peer-to-peer protocol and does not require any special RPC access to other nodes.
At the bottom right of the main window, you should see two numbers followed by an icon. The two numbers tell you the blockchain synchronization state. The top number is how many blocks are stored in your vault file, the bottom number is how many blocks were in the blockchain the last time you synchronized. If you have not connected to the network before, it should read 0/0 and the icon should display a red X.
Make sure the Groestlcoin node to which you're connecting (i.e. Groestlcoin-Qt) is synchronized, then select "Connect to <host>" from the Network menu – or click the "Connect" button from the toolbar. If the connection is successful, you should see the bottom number rise, then you should see the top number rise until they are the same. While this happens, the icon will contain a rotating arrow in an orange circle. Once the vault is synched, the icon will turn green.

4. Fund the account
Select the Accounts tab. In it you should see the account you just created. Make sure the account is selected. Click on the "Receive" toolbar button. You will be asked to give the payment a label and specify an amount – these are optional. Click the "New Invoice" button. At the bottom of the dialog you will see Script Details. On the right you'll get a QR code. Copy the "Address" from there and send a payment to it from another wallet. If successful, you should see the account balance credited the deposited amount.

5. View your transaction
Make sure the account is selected in the Accounts tab. Then select the Transactions tab. In it you should see the deposit you just made. Right-click on the transaction and select "View at blockchain.info" to open up a browser and view the transaction details.

6. Unlock keychains
In the Keychains tab, you must right-click the keychains you want to use to sign transactions and click "Unlock keychain..." from pop-up menu. Once unlocked, the keychains can be used to sign repeatedly within a session. When the program is closed and reopened, the keychains will again need to be unlocked. This is a security feature.
You will have the option to set a keychain passphrase. This will encrypt the keychain – the decrypted keychain will only be kept in memory while the keychain is unlocked. When exporting the keychain or account to file, only the encrypted keychain will be saved.
VERY IMPORTANT: IF YOU FORGET YOUR PASSPHRASE, TOO BAD! You might want to write down the passphrase and save it in a different location from where you store the encrypted keychain backups.

7. Send your first payment
Select the Accounts tab. Make sure the account from which you want to send is selected. Click the "Send" toolbar button. You will be asked to specify a fee, an address, an amount, and a label (For). A fee is generally required by the Groestlcoin network for transactions involving outputs smaller than 0.02 GRS, so if you're sending very small amounts it is recommended to use a fee of at least 0.0005 GRS. A higher fee tends to result in faster confirmation times, but exact confirmation time cannot be predicted. Once you've entered the transaction information, click "Save Unsigned". The unsigned transaction will appear at the top of the Transactions tab. Right-click it and select "Signatures..." to open the signature dialog. At the top you'll see the unsigned transaction hash as well as the number of signatures that are still required. Right-click a keychain and select "Add signature..." to sign for that keychain. NOTE: You can only sign for keychains for which you have the private master key. From the same popup menu, you can select "Export Transaction To File..." and "Import Transaction From File...". Use these commands to share unsigned or partially signed transactions as files with other people or other devices. Any added signatures get merged into the transaction when you import it. Once the minimum signatures required by your m-of-n policy have been added you'll have the option to send the transaction to the network by right-clicking it and selecting "Send Transaction".

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 create invoices?
4. Does the watch-only function works?
5. Can you use the wallet without running a local node?
6. Can you use the wallet running with a local node?

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 Multisig uses a filename .vault 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.

You can download it using the links below and be up and running with Groestlcoin in 5 minutes.
Compile the Linux wallet: https://github.com/GroestlCoin/Groestlcoin-Multisig/blob/master/docs/linux-build-environment
Download the OSX DMG Wallet here: https://github.com/GroestlCoin/Groestlcoin-Multisig/releases/download/0.9.4/Groestlcoin-Multisig.dmg
Download the Windows Wallet (64 bit) here: https://github.com/GroestlCoin/Groestlcoin-Multisig/releases/download/0.9.4/groestlcoin-multisig_x64.msi
Download the Windows Wallet (32 bit) here: https://github.com/GroestlCoin/Groestlcoin-Multisig/releases/download/0.9.4/groestlcoin-multisig_x86.msi

Source code:
https://github.com/GroestlCoin/Groestlcoin-Multisig - The Groestlcoin Multisig Wallet 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 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!

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)

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

Groestlcoin-wpf is an alternative full node client with optional lightweight "thin client" mode based on WPF. WPF, which stands for Windows Presentation Foundation, is Microsoft's latest approach to a GUI framework, used with the .NET framework. Its main advantages over the original Groestlcoin client include support for exporting blockchain.dat, and lite wallet mode which does not requiring the download of the entire block chain.

If you want an alternative full node wallet and simply want a wallet that just works without hassle, then groestlcoin-wpf is the right choice for you.

Features
• Works via TOR or SOCKS5 proxy
• Can use bootstrap.dat format as blockchain database
• Import/Export blockchain to/from bootstrap.dat
• Import wallet.dat from Groestlcoin-qt wallet
• Export wallet to wallet.dat or xml format
• Use both groestlcoin-wpf and groestlcoin-qt with the same addresses parallely. When you send money from one program, the transaction will automatically be visible on the other wallet.
• Rescan blockchain with a simple mouse click
• Works as a full node and listens to port 1331 (listening port can be changed)
• Fast Block verifying, parralel processing on multi-core CPUs
• Mine Groestlcoins with your cpu by a simple mouse click
• All private keys are kept encrypted on your local machine (or on a USB stick)
• Lite - Has a lightweight "thin client" mode which 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
• Free and decentralised - Open Source under GNU license

GroestlCoin-WPF Database Modes
• Normal mode - Customized DBLite library format. It uses persistent HashTable with parallel transactions. Non-compatible with other wallets. groestlcoin-wpf is set to 'normal mode' by default.
• Bootstrap mode - It is a flat, binary file containing Groestlcoin blockchain data, from the genesis block through a recent height. All versions automatically validate and import the file "grs.bootstrap.dat" in the grs directory. Grs.bootstrap.dat is compatible with Qt wallet. GroestlCoin-Qt can load from it.
• Lite (SPV) mode - Lite mode brings lightning-fast syncing with the Groestlcoin blockchain. Design based on the principles of the "Simplified Payment Verification" or "SPV" system outlined in section 8 of Satoshi's Whitepaper. We've integrated optional lite functionality within the wallet.

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 view your transaction on the blockexplorer?
4. Can you use the wallet with TOR?
5. Are you able to import your groestlcoin-qt (wallet.dat) file?
6. Are you able to export bootstrap.dat?
7. How long does it take to fully synchronize on normal and lite mode?

This application is licensed under the GNU 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 erros in this topic.

Important:
GroestlCoin-WPF uses a filename wallet.db instead of wallet.dat (like in Groestlcoin-QT)
Location Windows: Navigate to C:\Users\USER NAME\AppData\Roaming\GroestlCoin-WPF (or open windows explorer and enter %appdata%\GroestlCoin-WPF) and back up your wallet.db file by making a copy of it and moving it to a secure location.

You can download it using the links below.
Download the Windows Wallet (64 bit) here: https://github.com/GroestlCoin/Groestlcoin-WPF/releases/download/2.1.0.6/groestlcoin-wpf_x64.msi
Download the Windows Wallet (32 bit) here: https://github.com/GroestlCoin/Groestlcoin-WPF/releases/download/2.1.0.6/groestlcoin-wpf_x86.msi

Source code:
https://github.com/GroestlCoin/Groestlcoin-WPF - The GroestlCoin-WPF Wallet Source code

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.

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

How to use Groestlcoin Easyminer:
1. Unzip the zipfile
2. Run the RunMe.vbs file
3. Chose option 1 to start mining

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 erros 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%\Electryum-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 here: https://github.com/GroestlCoin/Groestlcoin-Easyminer/archive/1.0.zip

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

Hi!

To raise more awareness for Groestlcoin we have the following signatures available for our community



Please PM me to get the signatures.

Best Regards

gruve_p.

Instant HTML5 cross-platform Groestlcoin wallet, 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 that is cross-browser and platform compatible.
                                   
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 mouse around the screen (or finger on touch devices) 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

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:
Either copy the full URL somewhere safe or bookmark it for future access.
Even though the 'secret URL' is never stored on the Internet itself, most modern browsers will save every URL they see, meaning your new brain wallet may get saved too. That's handy if you're the only person using your machine, but more dangerous if you're using a shared or public computer. For this reason, the JSWallet team recommends setting a password, or using JSWallet only for quick transactions after which the new wallet is emptied and disposed of. Even if a hacker were to somehow gain access to a user's secret URL, a password would prevent them accessing your funds. Otherwise, be sure to clean out the browser's history as you would to get rid of any other embarrassing or unwanted URL record. While using multiple, easily created Groestlcoin addresses is a step toward anonymity and makes payments more difficult to tie to an individual.

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.

Create yours at jswallet.groestlcoin.org

Source code will be online soon here:
https://github.com/Groestlcoin/grs-rush-wallet - JSwallet running in node.js

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)

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

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/