Topic: [ANN][GRS] Groestlcoin | 1st to activate Segwit | Building Lightning Network - page 20. (Read 558266 times)

Great project & impressive github 

Any chance of porting the electrs server for GRS?
https://github.com/romanz/electrs
 

Whoo! Haven't visited here in ages! (Noo account)

Project Venezuela is progressing slowly and carefully. Waiting for our smartphones to turn up.

That does not contain all pools:
https://chainz.cryptoid.info/grs/#!extraction

Miningpoolhub is has 1 % hashrate only

List of Groestlcoin mining pools with live stats & hashrate distribution :

https://miningpoolstats.stream/groestlcoin

This coin should be Top 20

AT LEAST

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

Changelog Electrum-GRS 3.2.2:
• Qt GUI: seed word auto-complete during restore
• performance improvements (wallet, and Qt GUI)
• hardware wallets: show debug message during device scan
• add regtest support (via --regtest flag)
• other minor bugfixes and usability improvements
• If present, libsecp256k1 is used to speed up elliptic curve operations. The library is bundled in the Windows, MacOS, and Android binaries. On Linux, it needs to be installed separately.
• Transactions that are dropped from the mempool are kept in the wallet as 'local', and can be rebroadcast. Previously these transactions were deleted from the wallet.
• The scriptSig and witness part of transaction inputs are no longer parsed, unless actually needed. The wallet will no longer display 'from' addresses corresponding to transaction inputs, except for its own inputs.
• The partial transaction format has been incompatibly changed. This was needed as for partial transactions the scriptSig/witness has to be parsed, but for signed transactions we did not want to do the parsing.  Users should make sure that all instances of Electrum-GRS they use to co-sign or offline sign, are updated together.
• Signing of partial transactions created with online imported addresses wallets now supports significantly more setups. Previously only online p2pkh address + offline WIF was supported.  Now the following setups are all supported:
 - online {p2pkh, p2wpkh-p2sh, p2wpkh} address + offline WIF,
 - online {p2pkh, p2wpkh-p2sh, p2wpkh} address + offline seed/xprv,
 - online {p2sh, p2wsh-p2sh, p2wsh}-multisig address + offline seeds/xprvs
 (potentially distributed among several different machines)
Note that for the online address + offline HD secret case, you need the offline wallet to recognize the address (i.e. within gap limit).  Having an xpub on the online machine is still the recommended setup, as this allows the online machine to generate new addresses on demand.
• Segwit multisig for bip39 and hardware wallets is now enabled (both p2wsh-p2sh and native p2wsh).
• Ledger: offline signing for segwit inputs (#3302) This has already worked for Trezor. Offline segwit signing can be combined with online imported addresses wallets.
• Added Revealer plugin. ( https://revealer.cc ) Revealer is a seed phrase back-up solution. It allows you to create a cold, analog, multi-factor backup of your wallet seeds, or of any arbitrary secret. The Revealer utilizes a transparent plastic visual one time pad.
• Fractional fee rates: the Qt GUI now displays fee rates with 0.1 gro/byte precision, and also allows this same resolution in the Send tab.
• Hardware wallets: a "show address" button is now displayed in the Receive tab of the Qt GUI. (#4316)
• Trezor One: implemented advanced/matrix recovery (#4329)
• Windows: use dnspython to resolve dns instead of socket.getaddrinfo (#4422)
• Importing minikeys: use uncompressed pubkey instead of compressed (#4384)
• SPV proofs: check inner nodes not to be valid transactions (#4436)
• Qt GUI: there is now an optional "dark" theme (#4461)
• Several other minor bugfixes and usability improvements.
• Fix DNS resolution on Windows
• Fix websocket bug in daemon

Changelog Electrum-GRS 3.1.2:
• Capital gains: For each outgoing transaction, the difference between the acquisition and liquidation prices of outgoing coins is displayed in the wallet history. By default, historical exchange rates are used to compute acquisition and liquidation prices. These values can also be entered manually, in order to match the actual price realized by the user. The order of liquidation of coins is the natural order defined by the blockchain; this results in capital gain values that are invariant to changes in the set of addresses that are in the wallet. Any other ordering strategy (such as FIFO, LIFO) would result in capital gain values that depend on the presence of other addresses in the wallet.
• Local transactions: Transactions can be saved in the wallet without being broadcast. The inputs of local transactions are considered as spent, and their change outputs can be re-used in subsequent transactions. This can be combined with cold storage, in order to create several transactions before broadcasting them. Outgoing
transactions that have been removed from the memory pool are also saved in the wallet, and can be broadcast again.
• Checkpoints: The initial download of a headers file was replaced with hardcoded checkpoints. The wallet uses one checkpoint per retargeting period. The headers for a retargeting period are downloaded only if transactions need to be verified in this period.
• The 'privacy' and 'priority' coin selection policies have been merged into one. Previously, the 'privacy' policy has been unusable because it was was not prioritizing confirmed coins. The new policy is similar to 'privacy', except that it de-prioritizes addresses that have unconfirmed coins.
• The 'Send' tab of the Qt GUI displays how transaction fees are computed from transaction size.
• The wallet history can be filtered by time interval.
• Replace-by-fee is enabled by default. Note that this might cause some issues with wallets that do not display RBF transactions until they are confirmed.
• Watching-only wallets and hardware wallets can be encrypted.
• The SSL checkbox option was removed from the GUI.
• The Trezor One and T hardware wallet is now supported.
• The Ledger hardware wallet is now supported.
• BIP84: native segwit p2wpkh scripts for bip39 seeds and hardware wallets can now be created when specifying a BIP84 derivation path. This is usable with Trezor and Ledger.
• Windows: the binaries now include ZBar, and QR code scanning should work.
• The Wallet Import Format (WIF) for private keys that was extended in 3.0 is changed. Keys in the previous format can be imported, compatibility is maintained. Newly exported keys will be serialized as "script_type:original_wif_format_key".
• BIP32 master keys for testnet once again have different version bytes than on mainnet. For the mainnet prefixes {x,y,Y,z,Z}|{pub,prv}, the corresponding testnet prefixes are {t,u,U,v,V}|{pub,prv}. Note that due to this change, testnet wallet files created with previous versions of Electrum must be considered broken, and they need to be recreated from seed words.
• A new version of the Electrum-GRS protocol is required by the client (version 1.2). Servers using older versions of the protocol will not be displayed in the GUI.

Changelog Electrum-GRS 3.0.6:
• Moved away from Linux binary file. Users must compile from source now.
• Moved away from electrum-grs-server codebase to electrumx-grs 1.2
• The source code is relicensed under the MIT Licence
• Separation between plugins and GUIs
• The command line uses jsonrpc to communicate with the daemon
• New command: 'notify

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

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

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

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

This application is licensed under the GPL version 3. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

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

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

Download the OSX wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.2.2/electrum-grs-v3.2.2.dmg
Note: The QR code scanner is not supported in OSX binary

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.2.2/electrum-grs-v3.2.2-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.2.2/electrum-grs-v3.2.2.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v3.2.2/electrum-grs-v3.2.2-portable.exe

Linux wallet instructions:
sudo apt-get install python3-setuptools python3-pyqt5 python3-pip python3-dev libssl-dev
sudo pip3 install groestlcoin_hash
sudo pip3 install https://github.com/Groestlcoin/electrum-grs/releases/download/v3.2.2/Electrum-grs-3.2.2.tar.gz
electrum-grs

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

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

Changelog Electrum-GRS 3.2.2:
• Android: fix some crashes
• If present, libsecp256k1 is used to speed up elliptic curve operations. The library is bundled in the Windows, MacOS, and Android binaries. On Linux, it needs to be installed separately.
• Two-factor authentication is available on Android. Note that this will only provide additional security if one time passwords are generated on a separate device.
• Semi-automated crash reporting is implemented for Android.
• Qt/Kivy: added "gro" as optional base unit.
• Kivy GUI: significant performance improvements when displaying history and address list of large wallets; and transaction dialog of large transactions.

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

It is appreciated if feedback of the following is provided:
1. Can you receive coins with legacy addresses? (small amounts to avoid losing them)
2. Can you receive coins with bech32 addresses? (small amounts to avoid losing them)
3. Can you receive coins with legacy testnet addresses? (small amounts to avoid losing them)
4. Can you receive coins with bech32 testnet addresses? (small amounts to avoid losing them)
5. Can you send coins with legacy addresses? (small amounts to avoid losing them)?
6. Can you send coins with bech32 addresses? (small amounts to avoid losing them)?
7. Can you send coins with legacy testnet addresses? (small amounts to avoid losing them)?
8. Can you send coins with bech32 testnet addresses? (small amounts to avoid losing them)?
9. Does it automatically detect servers under Tools - Network?
10. Are you able to sweep private keys?
11. Are you able to sign/verify messages?
12. Are you able to encrypt/decrypt messages?

This application is licensed under the GPL version 3. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

Important:
Store your secret phrase somewhere safe!
The multi-signature and non native segwit addresses starts with a "3" and not with a "F".

Electrum-GRS is available in the Google play store:
https://play.google.com/store/apps/details?id=org.groestlcoin.electrumgrs

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

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

Features
• Ability to continue finding keys after first one is found
• Includes warning on startup if connected to the internet
• Ability to output keys to a text file (And shows button to open that directory)
• Ability to make your match case sensitive (Where possible)
• Show and hide the private key with a simple toggle switch, and copy the private key straight to your clipboard
• Show full output of commands
• Includes statistics whilst the application is running
• Ability to choose between Processor (CPU) and Graphics Card (GPU)
• Automatically detects 32 or 64 bit systems
• Features both a Light and Dark Material Design-Style Themes
• EasyVanity's search is probabilistic, and the amount of time required to find a given pattern depends on how complex the pattern is, the speed of your computer, and whether you get lucky.
• EasyVanity includes components to perform address searching on your CPU (vanitygen) and your OpenCL-compatible GPU (oclvanitygen). Both can be built from source, and both are included in the Windows binary package.
• Prefixes are exact strings that must appear at the beginning of the address. When searching for prefixes, Easyvanity will ensure that the prefix is possible, and will provide a difficulty estimate.
• The percentage displayed just shows how probable it is that a match would be found in the session so far. If it finds your address with 5% on the display, you are extremely lucky.  If it finds your address with 92% on the display, you are unlucky.  If you stop EasyVanity with 90% on the display, restart it, and it finds your address with 2% on the display, your first session was unlucky, but your second session was lucky.
• EasyVanity uses the OpenSSL random number generator. This is the same RNG used by groestlcoin and a good number of HTTPS servers. It is regarded as well-scrutinized. Guessing the private key of an address found by EasyVanity will be no easier than guessing a private key created by groestlcoin itself.
• To speed up address generation, EasyVanity uses the RNG to choose a private key, and literally increments the private key in a loop searching for a match. As long as the starting point is not disclosed, if a match is found, the private key will not be any easier to guess than if every private key tested were taken from the RNG. EasyVanity will also reload the private key from the RNG after 10,000,000 unsuccessful searches (100M for oclvanitygen), or when a match is found and multiple patterns are being searched for.
• Free software - MIT. Anyone can audit the code.
• Written in C# - The code is short, and easy to review.

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

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

This application is licensed under the MIT There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

The application may have unfound bugs and problems. To leave feedback: 
1.  Email: [email protected]
2.  Reports of errors can also be posted in this topic.

Download the Groestlcoin EasyVanity here:
Installer with Binaries: https://github.com/Groestlcoin/Groestlcoin-EasyVanity/releases/download/1/VanityGenInstaller_WithBinaries.msi
Installer without Binaries: https://github.com/Groestlcoin/Groestlcoin-EasyVanity/releases/download/1/VanityGenInstaller_NoBinaries.msi
Non Installer with binaries: https://github.com/Groestlcoin/Groestlcoin-EasyVanity/releases/download/1/Groestlcoin.EasyVanity.No.Install.zip
Non Installer without binaries: https://github.com/Groestlcoin/Groestlcoin-EasyVanity/releases/download/1/Groestlcoin.EasyVanity.No.Install.No.Binaries.zip

Note: There are two separate installers. Some antivirus software may consider the vanitygen executables that this application uses to be malicious, and as a result we have included an installer that does not contain the Vanitygen files. If the full release causes you trouble, download the Install-Only version and copy the latest windows binaries from https://github.com/Groestlcoin/vanitygen/releases into $InstallDirectory\ProgFiles after installation. We're working hard to negate these issues for a future release.

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

---

---

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

Changelog v3.5.02:
• Track Segwit BIP84 ZPUBs extended pubkeys
• Sweep Segwit BIP49 (P2SH-P2WPHK) and Segwit BIP84 (bech32) amounts into selected account/address
• Broadcast hex tx
• Added option to chose from Binance and Upbit as selected Exchange
• Added Korean Won as price option
• Receive address closes upon receipt of groestlcoin
• Fix EUR price

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

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

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you scan a QR code from another phone.
3. Can you broadcast a raw tx?
4. Can you view the transactions on the block explorer?
5. Are you able to export and restore the wallet?
6. Can you add multiple XPUB's or addresses in the wallet?
7. Can you add multiple YPUB's or addresses in the wallet?
8. Can you add multiple ZPUB's or addresses in the wallet?
9. Can you sweep P2PKH (legacy) paperwallet?
10. Can you sweep Segwit BIP49 (P2SH-P2WPHK) paperwallet?
11. Can you sweep Segwit BIP84 (bech32) paperwallet?
12. Does it calculate exchange rates properly in your local currency?

This application is unlicensed. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalksearch.org/user/hashengineering-155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

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

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

---

---

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

Changelog v3.5.02:
• Track Segwit BIP84 ZPUBs extended pubkeys
• Sweep Segwit BIP49 (P2SH-P2WPHK) and Segwit BIP84 (bech32) amounts into selected account/address
• Broadcast hex tx
• Added option to chose from Binance and Upbit as selected Exchange
• Added Korean Won as price option
• Receive address closes upon receipt of groestlcoin
• Fix EUR price

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

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

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you scan a QR code from another phone.
3. Can you broadcast a raw tx?
4. Can you view the transactions on the block explorer?
5. Are you able to export and restore the wallet?
6. Can you add multiple XPUB's or addresses in the wallet?
7. Can you add multiple YPUB's or addresses in the wallet?
8. Can you add multiple ZPUB's or addresses in the wallet?
9. Can you sweep P2PKH (legacy) paperwallet?
10. Can you sweep Segwit BIP49 (P2SH-P2WPHK) paperwallet?
11. Can you sweep Segwit BIP84 (bech32) paperwallet?
12. Does it calculate exchange rates properly in your local currency?

This application is unlicensed. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalksearch.org/user/hashengineering-155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

Groestlcoin Sentinel is available in the Blackberry World:
https://appworld.blackberry.com/webstore/content/59999358/

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

---

---

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

Features
• Sweep P2PKH, Segwit BIP49 (P2SH-P2WPHK) and Segwit BIP84 (bech32) amounts into selected account/address
• Broadcast hex tx
• Receive address closes upon receipt of testnet groestlcoins
• Refresh button
• Multiple blockexplorers support
• Haptic PIN entry support
• Open source and unlicensed.
• No Private Keys - Groestlcoin Sentinel Testnet only uses Public Keys. It never knows or never asks for your Private Keys.
• Track multiple TPUB's, UPUB's, VPUB's or Addresses - Add multiple TPUB's, UPUB's, VPUBS's or addresses to your Groestlcoin Sentinel Testnet Watchlist to keep track of balances, transactions, and accept payments into any added wallet or address.
• Deterministically derives Groestlcoin Testnet Addresses - Deterministically derive new Groestlcoin Testnet addresses associated with your added wallets without needing access or knowledge to your private keys.
• Shareable QR code - Create payment request QR codes with address and amount encoded directly into the image. Share with anyone or any app directly from Groestlcoin Sentinel Testnet.
• Secure PIN Code protection - Add a secure PIN code to protect access to Groestlcoin Sentinel Testnet. Optionally turn on PIN Scramble to help thwart against keylogger attacks.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you scan a QR code from another phone.
3. Can you broadcast a raw tx?
4. Can you view the transactions on the block explorer?
5. Are you able to export and restore the wallet?
6. Can you add multiple TPUB's or addresses in the wallet?
7. Can you add multiple UPUB's or addresses in the wallet?
8. Can you add multiple VPUB's or addresses in the wallet?
9. Can you sweep P2PKH (legacy) paperwallet?
10. Can you sweep Segwit BIP49 (P2SH-P2WPHK) paperwallet?
11. Can you sweep Segwit BIP84 (bech32) paperwallet?

This application is unlicensed. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalksearch.org/user/hashengineering-155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

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

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

---

---

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

Features
• Sweep P2PKH, Segwit BIP49 (P2SH-P2WPHK) and Segwit BIP84 (bech32) amounts into selected account/address
• Broadcast hex tx
• Receive address closes upon receipt of testnet groestlcoins
• Refresh button
• Multiple blockexplorers support
• Haptic PIN entry support
• Open source and unlicensed.
• No Private Keys - Groestlcoin Sentinel Testnet only uses Public Keys. It never knows or never asks for your Private Keys.
• Track multiple TPUB's, UPUB's, VPUB's or Addresses - Add multiple TPUB's, UPUB's, VPUBS's or addresses to your Groestlcoin Sentinel Testnet Watchlist to keep track of balances, transactions, and accept payments into any added wallet or address.
• Deterministically derives Groestlcoin Testnet Addresses - Deterministically derive new Groestlcoin Testnet addresses associated with your added wallets without needing access or knowledge to your private keys.
• Shareable QR code - Create payment request QR codes with address and amount encoded directly into the image. Share with anyone or any app directly from Groestlcoin Sentinel Testnet.
• Secure PIN Code protection - Add a secure PIN code to protect access to Groestlcoin Sentinel Testnet. Optionally turn on PIN Scramble to help thwart against keylogger attacks.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you scan a QR code from another phone.
3. Can you broadcast a raw tx?
4. Can you view the transactions on the block explorer?
5. Are you able to export and restore the wallet?
6. Can you add multiple TPUB's or addresses in the wallet?
7. Can you add multiple UPUB's or addresses in the wallet?
8. Can you add multiple VPUB's or addresses in the wallet?
9. Can you sweep P2PKH (legacy) paperwallet?
10. Can you sweep Segwit BIP49 (P2SH-P2WPHK) paperwallet?
11. Can you sweep Segwit BIP84 (bech32) paperwallet?

This application is unlicensed. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalksearch.org/user/hashengineering-155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

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

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

---

---

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

Changelog 1.4:
• RBF enabled by default
• Bech32 address support added
• Testnet support added

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

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

It is appreciated if feedback of the following is provided:
1. Are you able to create a compressed address?
2. Are you able to create an uncompressed address?
3. Are you able to create a multisig address?
4. Are you able to receive?
5. Are you able to send?
6. Are you able to decode transactions?
7. Are you able to sign offline transactions?
8. Are you able to broadcast transactions?
9. Are you able to use the RBF option?
10. Are you able to scan the QR code?
11. Are you able to add custom data to transactions with use of OP_RETURN?
12. Are you able to use OP_HODL?
13. Are you able to use the built-in wallet?
14. Are you able to create a BIP49 (P2SH-P2WPHK) address?
15. Are you able to create a BIP84 bech32 address?
16. Are you able to use the Testnet version?

This application is licensed under MIT. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

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

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

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

---

---

P2sh paperwallet supports creating p2sh paperwallet in bulk, keypair generation with QR codes and sweeping tool. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.

Changelog 0.3.2
• Details section to validate private keys and to view corresponding segwit address, public key and redeem script.
• Segwit brain wallet
• Removed Vanity generator as it was very slow.
• Rebranded segwit paperwallet to p2sh paperwallet
• Favicon updated
• Testnet support added
• Groestlcoin Sentinel can sweep funds from private keys and QR codes generated with https://www.groestlcoin.org/p2shpaper.html
• Groestlcoin Sentinel Testnet can sweep funds from private keys and QR codes generated with https://www.groestlcoin.org/p2shpaper.html?testnet=true
• Electrum-GRS can import private keys using the console and the importprivkey() command. Import as P2SH segwit: importprivkey('p2wpkh-p2sh:KzTLBvC6mNudLBjEmwYCuk3jrZ7sZS8CzFDzcrwnDM2CVpH8vNAn')
• Electrum-GRS Testnet can import private keys using the console and the importprivkey() command. Import as P2SH segwit: importprivkey('p2wpkh-p2sh:cNNDi1AT8XNng2wJ5HNFN41toufU9XZ2bW8MGi7c9SGw4hnMuASk')

Features
• Keypair generation with QR Codes
• Bulk address generator
• Key Sweeping Tool to move all funds belonging to a single SegWit private key.

Live version available at https://www.groestlcoin.org/p2shpaper.html. But it is recommended to download the p2sh paperwallet offline and run it on your pc. Open index.html to get started. You can enable testnet mode by adding ?testnet=true to the end of the url. Example: https://www.groestlcoin.org/p2shpaper.html?testnet=true Or locally: localhost/webwallet/index.html?testnet=true

It is appreciated if feedback of the following is provided:
1. Are you able to generate p2sh addresses?
2. Are you able to sweep p2sh private key?
3. Are you able to scan with webcam?
4. Are you able to generate bulk keys?
5. Are you able to validate private keys and to view corresponding segwit address, public key and redeem script on the details section?

There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

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

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

---

---

Bech32 paperwallet supports creating bech32 paperwallet in bulk, keypair generation with QR codes and sweeping tool. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.

Features
• Detail section to validate private keys and to view corresponding segwit address, public key and redeem script.
• Segwit brain wallet
• Testnet support
• Groestlcoin Sentinel can sweep funds from private keys and QR codes generated with https://www.groestlcoin.org/bech32paper.html
• Groestlcoin Sentinel Testnet can sweep funds from private keys and QR codes generated with https://www.groestlcoin.org/bech32paper.html?testnet=true
• Electrum-GRS can import private keys using the console and the importprivkey() command. Import as native(bech32) segwit: importprivkey('p2wpkh:KzTLBvC6mNudLBjEmwYCuk3jrZ7sZS8CzFDzcrwnDM2CVpH8vNAn')
• Electrum-GRS Testnet can import private keys using the console and the importprivkey() command. Import as native(bech32) segwit: importprivkey('p2wpkh:cNNDi1AT8XNng2wJ5HNFN41toufU9XZ2bW8MGi7c9SGw4hnMuASk')
• Keypair generation with QR Codes
• Bulk address generator
• Key Sweeping Tool to move all funds belonging to a single SegWit private key.

Live version available at https://www.groestlcoin.org/bech32paper.html. But it is recommended to download the bech32 paperwallet offline and run it on your pc. Open index2.html to get started. You can enable testnet mode by adding ?testnet=true to the end of the url. Example: https://www.groestlcoin.org/bech32paper.html?testnet=true Or locally: localhost/webwallet/index2.html?testnet=true

It is appreciated if feedback of the following is provided:
1. Are you able to generate bech32 addresses?
2. Are you able to sweep bech32 private key?
3. Are you able to scan with webcam?
4. Are you able to generate bulk keys?
5. Are you able to validate private keys and to view corresponding segwit address, public key and redeem script on the details section?

There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

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

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

---

---

GRSPay is a non-custodial invoicing system which eliminates the involvement of a third-party. Payments with GRSPay go directly to your wallet, which increases the privacy and security. Your private keys are never uploaded to the server. There is no address re-use, since each invoice generates a new address deriving from your xpubkey or zpubkey.

GRSPay is available at https://grspay.com
https://www.youtube.com/watch?v=c7s3zZnlQ6M

Features
• Direct, P2P Groestlcoin payments
• Lightning Network support coming soon
• Complete control over private keys
• Enchanced privacy
• SegWit support
• Process payments for others
• Payment buttons
• Point of sale
• No transaction fees (other than those for the crypto networks)
• No processing fees
• No middleman
• No KYC
• The software is built in C#
• You can run GRSPay as a self-hosted solution on your own server or use a our host. The self-hosted solution allows you not only to attach an unlimited number of stores (and soon use the Lightning Network) but also become the payment processor for others.
• Open Source - MIT license

FAQ
### How to use WooCommerce store with GRSPay?
https://www.youtube.com/watch?v=qNMTDEPhWhY

### Why can't I just give my Groestlcoin address to a buyer?

Re-using the address for receiving payments is a privacy issue. Providing a different address manually to each customer is not an optimal solution. Imagine having to send an e-mail that wants to pay you with cryptocurrency.
GRSPay solves the address re-use and automates the checkout process. The software is a complete, automated invoicing system. It integrates into your checkout process and customers can pay you in Groestlcoin in few clicks.
After the payment, the software notifies your store that the order has been paid/completed. Depending on the e-commerce software you're using, it can also change the order status. You worry about getting items shipped, leave the invoicing and payment processing to GRSPay.

### Does GRSPay need my private key?

Absolutely not. The fact that GRSPay never needs access to your master private key for on-chain transactions is a huge security advantage. Even if our server gets hacked, your funds from the on-chain transactions are always safe. Securing your on-chain funds, comes down to your own security.
When we will support lightning node, GRSPay technically will have access to the keys (macarons) of your LN.

### Address re-use - How GRSPay creates a different address?

GRSPay generates a different address for each invoice. The address is derived from your xpubkey or zpubkey. Your private keys are never uploaded or required by GRSPay. The software only needs your extended public key. You can create your private key in your software or hardware wallet and import the public key (xpub/zpub) into GRSPay so that it can derive addresses from it. Meanwhile, you should stick to the best practices for protecting your private key.

### What e-commerce integrations are available?

Currently, GRSPay has integrations with the following e-commerce platforms:
- WordPress / WooCommerce
- Magneto
- Drupal
- Prestashop
- Custom integration

### Do I need to have an online store to accept Groestlcoin?

You can use GRSPay even if you don't have an e-commerce store. You can launch your GRSpay and be the payment processor for your friends or local market. Another use-case is to accept donations through the POS (Point of Sale) app or payment buttons which can be copy-pasted as HTML snippets into any website.

### Does GRSPay Server support groestlcoin to fiat conversion?

At this time, it is not possible to instantly convert your payments into fiat through GRSPay.

### Does GRSPay Support Lightning Network?

No not yet but coming soon.

### What is a "network cost"?

Network cost is a feature in GRSPay which protects merchants from a customer who pays the invoice partially. When an invoice is paid from many outputs, the fee for a merchant to move those funds will be higher.
For example, your customer created an invoice for 20$ and paid 20 x 1$. You as a merchant now have a larger transaction which increases the mining cost should you decide to move those funds. GRSPay applies a network cost after the first transaction, to cover for merchants expense.
The network cost in GRSPay is not the same thing as the mining fee. Your customer would still need to pay for the miner's fee.
The network cost is an optional feature. It's enabled by default, but it's entirely up to a merchant to enable or disable it. Your customers will be able to see this "network cost" at the checkout when they expand the invoice information.
While it protects dust transactions, it can also reflect negatively and your customers might have additional questions and may lead them into thinking you're overcharging them.
Please think twice about how this may affect your business and make sure to communicate it to your customers properly inside your store Terms of Service or by other methods.

## Invalid Status Code:301 when pairing the store with GRSPay.

Please make sure to enter the URL of the host you're trying to pair with correctly, including the HTTP(s) part. For example https://grspay.com

## Invalid derivation scheme

If you're getting this error, this means that you have not connected your wallet to GRSPay. In Store>Settings> Derivation Scheme, on the right-hand side click modify and set up your derivation scheme correctly.

It is appreciated if feedback of the following is provided:
1. Are you able to register at GRSPay?
2. Are you able to create a store?
3. Are you able to create an invoice?
4. Are you able to create a POS?
5. Are you able to receive payments through GRSPay?
6. Are you able to setup your derivation scheme?
7. Are you able to setup 2 factor authentication?

This application is licensed under MIT. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

Source code:
GRSPay: https://github.com/Groestlcoin/btcpayserver - GRSPay code

---

---

GRSPay Testnet is a non-custodial invoicing system which eliminates the involvement of a third-party. Payments with GRSPay Testnet go directly to your wallet, which increases the privacy and security. Your private keys are never uploaded to the server. There is no address re-use, since each invoice generates a new address deriving from your tpubkey or vpubkey.

GRSPay Testnet is available at https://testnet.grspay.com/
https://www.youtube.com/watch?v=c7s3zZnlQ6M

Features
• Direct, P2P Groestlcoin Testnet payments
• Lightning Network Testnet support coming soon
• Complete control over private keys
• Enchanced privacy
• SegWit Testnet support
• Process payments for others
• Payment buttons
• Point of sale
• No transaction fees (other than those for the crypto networks)
• No processing fees
• No middleman
• No KYC
• The software is built in C#
• You can run GRSPay Testnet as a self-hosted solution on your own server or use a our host. The self-hosted solution allows you not only to attach an unlimited number of stores (and soon use the Lightning Network Testnet) but also become the payment processor for others.
• Open Source - MIT license

FAQ
### How to use WooCommerce store with GRSPay Testnet?
https://www.youtube.com/watch?v=qNMTDEPhWhY

### Does GRSPay Testnet need my private key?

Absolutely not. The fact that GRSPay Testnet never needs access to your master private key for on-chain transactions is a huge security advantage. Even if our server gets hacked, your funds from the on-chain transactions are always safe. Securing your on-chain funds, comes down to your own security.
When we will support lightning node, GRSPay Testnet technically will have access to the keys (macarons) of your LN.

### Address re-use - How GRSPay Testnet creates a different address?

GRSPay Testnet generates a different address for each invoice. The address is derived from your tpubkey or vpubkey. Your private keys are never uploaded or required by GRSPay Testnet. The software only needs your extended public key. You can create your private key in your software or hardware wallet and import the public key (tpub/vpub) into GRSPay Testnet so that it can derive addresses from it. Meanwhile, you should stick to the best practices for protecting your private key.

### What e-commerce integrations are available?

Currently, GRSPay Testnet has integrations with the following e-commerce platforms:
- WordPress / WooCommerce
- Magneto
- Drupal
- Prestashop
- Custom integration

### Does GRSPay Testnet Support Lightning Network Testnet?

No not yet but coming soon.

## Invalid Status Code:301 when pairing the store with GRSPay Testnet.

Please make sure to enter the URL of the host you're trying to pair with correctly, including the HTTP(s) part. For example https://testnet.grspay.com

## Invalid derivation scheme

If you're getting this error, this means that you have not connected your wallet to GRSPay Testnet. In Store>Settings> Derivation Scheme, on the right-hand side click modify and set up your derivation scheme correctly.

It is appreciated if feedback of the following is provided:
1. Are you able to register at GRSPay Testnet?
2. Are you able to create a store?
3. Are you able to create an invoice?
4. Are you able to create a POS?
5. Are you able to receive payments through GRSPay Testnet?
6. Are you able to setup your derivation scheme?
7. Are you able to setup 2 factor authentication?

This application is licensed under MIT. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

Source code:
GRSPay: https://github.com/Groestlcoin/btcpayserver - GRSPay code

---

---

v2.16.3 is now the official release version of Groestlcoin Core. This is a new major version release with a very important security updates. It is recommended to upgrade to this version as soon as possible. Stop running versions of Groestlcoin Core affected by CVE-2018-17144 asap: These are 2.13.3 and 2.16.0.


What's new in version v2.16.3?
This is a major release of Groestlcoin Core fixing a Denial of Service component and a critical inflation vulnerability (https://nvd.nist.gov/vuln/detail/CVE-2018-17144) exploitable by miners that has been discovered in Groestlcoin Core version 2.13.3 and 2.16.0. It is recommended to upgrade to 2.16.3 as soon as possible.
If you only occasionally run Groestlcoin Core, then it's not necessary to run out and upgrade it right this second. However, you should upgrade it before you next run it. If you know anyone who is running an older version, tell them to upgrade it ASAP. Stored funds are not at risk, and never were at risk.
At this time we believe over half of the Groestlcoin hashrate has upgraded to patched nodes. We are unaware of any attempts to exploit this vulnerability.
However, it still remains critical that affected users upgrade and apply the latest patches to ensure no possibility of large reorganizations, mining of invalid blocks, or acceptance of invalid transactions occurs.

Technical Details
In Groestlcoin Core 2.13.3, an optimization was added (Bitcoin Core PR #9049) which avoided a costly check during initial pre-relay block validation that multiple inputs within a single transaction did not spend the same input twice which was added in 2012 (Bitcoin Core PR #443). While the UTXO-updating logic has sufficient knowledge to check that such a condition is not violated in 2.13.3 it only did so in a sanity check assertion and not with full error handling (it did, however, fully handle this case twice in prior to 2.1.0.6).
Thus, in Groestlcoin Core 2.13.3, any attempts to double-spend a transaction output within a single transaction inside of a block will result in an assertion failure and a crash, as was originally reported.
In Groestlcoin Core 2.16.0, as a part of a larger redesign to simplify unspent transaction output tracking and correct a resource exhaustion attack the assertion was changed subtly. Instead of asserting that the output being marked spent was previously unspent, it only asserts that it exists.
Thus, in Groestlcoin Core 2.16.0, any attempts to double-spend a transaction output within a single transaction inside of a block where the output being spent was created in the same block, the same assertion failure will occur. However, if the output being double-spent was created in a previous block, an entry will still remain in the CCoin map with the DIRTY flag set and having been marked as spent, resulting in no such assertion. This could allow a miner to inflate the supply of Groestlcoin as they would be then able to claim the value being spent twice.

Groestlcoin would like to publicly thank Reddit user u/Awemany for finding CVE-2018-17144 and reporting it (https://lists.linuxfoundation.org/pipermail/bitcoin-core-dev/2018-September/000064.html). You deserve gratitude and appreciation from cryptoworld, and you have ours. If you want to support him for his work, please consider donating to him on his bitcoin cash address: bitcoincash:qr5yuq3q40u7mxwqz6xvamkfj8tg45wyus7fhqzug5


Changelog:
• Fix for CVE-2018-17144 Denial of Service component and a critical inflation vulnerability
• The `-blockmaxsize` option for miners to limit their blocks' sizes has been removed. Miners should use the `-blockmaxweight` option if they want to limit the weight of their blocks' weights.

It is appreciated if feedback of the following is provided:
1. Can you receive coins on a bech32 address? (small amounts to avoid losing them)
2. Can you receive coins on a legacy address? (small amounts to avoid losing them)
3. Can you receive coins on a p2sh-segwit address? (small amounts to avoid losing them)
4. Can you send coins on a bech32 address?
5. Can you send coins on a legacy address?
6. Can you send coins on a p2sh-segwit address?
7. Can you view your transaction on a third party blockexplorer (restart the client after entering the url of the blockexplorer) ?
8. Can you use the wallet with TOR?
9. Are you able to backup your wallet (wallet.dat) file?
10. Are you able to encrypt your wallet (wallet.dat) file?
11. Are you able to use watch-only function?
12. How long does it take to fully synchronize?
13. Are you able to sign/verify messages?
14. Are you able to see you send/receive addresses?
15. 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 v2.11.0, v2.13.3 and v2.16.0 network there is the possibility that we missed something. ALWAYS BACKUP YOUR GROESTLCOIN WALLET BEFORE UPGRADING.

How to Upgrade?
The first time you run version 2.16.3, your chainstate database may be converted to a new format, which will take anywhere from a few minutes to half an hour, depending on the speed of your machine.
Windows: 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.
OSX: 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), run the dmg and drag Groestlcoin Core to Applications.
Ubuntu users: http://groestlcoin.org/forum/index.php?topic=441.0
Linux users: http://groestlcoin.org/forum/index.php?topic=97.0

Download the Windows Installer (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-win64.msi
Download the Windows Installer (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-win32.msi
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-x86_64-w64-mingw32.zip
Download the Windows binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-i686-w64-mingw32.zip
Download the OSX Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-osx.dmg
Download the OSX binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-x86_64-apple-darwin11.tar.gz
Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-x86_64-linux-gnu.tar.gz
Download the Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-i686-pc-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.16.3/groestlcoin-2.16.3-arm-linux-gnueabihf.tar.gz

SHA-256 hashes of the released files for verification:
groestlcoin-2.16.3-x86_64-linux-gnu.tar.gz
f15bd5e38b25a103821f1563cd0e1b2cf7146ec9f9835493a30bd57313d3b86f
groestlcoin-2.16.3-aarch64-linux-gnu.tar.gz
d576c0aa488fa5d88077fd9cb2fec855619ce2512254cb207085f3e9440305c0
groestlcoin-2.16.3-arm-linux-gnueabihf.tar.gz
a7f9f4fcaaeb31c9617cf9711ea14c67cf810bace6e0fb60d208e559e295a65f
groestlcoin-2.16.3-i686-pc-linux-gnu.tar.gz
d8432224a6bafb06f953200f997e29a3925fc21cfe7f4ee8c22080fcc9eb182d
groestlcoin-2.16.3-osx.dmg
3d54c4c3affa2cceaed0942449cbc07b722295b872b4757077f1f076b0d27f53
groestlcoin-2.16.3-win64.msi
dc7aa2e4598f053ebecee77fa6cf888b2024b9a1b03991622556fd91a209e281
groestlcoin-2.16.3-win32.msi
e8318c3599809117cac56182c5684134b54255533faf8adbfb7e0b36dcfbbde2
groestlcoin-2.16.3-x86_64-w64-mingw32.zip
9617e7ec61a1f8850d11613ff3d4f4e1d8caa29e118ec1c29e07ef323b16557d
groestlcoin-2.16.3-i686-w64-mingw32.zip
28785ef0dd70d39ad6a0f68c651e4ce001e69b5b09dded9bde5f7491eaf3d54b
groestlcoin-2.16.3-x86_64-apple-darwin11.tar.gz
4976c8f60105a32bb0d8e230577f60438d5bed45a9aa92c51f0dd79a13c6b89e

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

All being compiled right now. It will be available within 3 hours.

Huobi listing is very big news because it allows GRS penetration to the Chinese markets;  Binance is big with Westerners and Japanese, but Chinese do not use Binance (Alexa analytics shows this);  Huobi is most liquid exchange for Chinese.  Now GRS will be traded in all major crypto regions.