[ANN][GRS] Groestlcoin | 1st to activate Segwit & Taproot

[jackielove4u]

New exchange coingamex.com accepts Groestlcoin, in case you are interested

GRS/BTC and GRS/ETH markets

Thanks!

[percy_tc]

Groestlcoin doing pretty nicely nowadyas. However difficulty skyrocketed. Sneaky Mr. Baikal

[dieglhix]

Groestlcoin doing pretty nicely nowadyas. However difficulty skyrocketed. Sneaky Mr. Baikal

baikal mines groestl-myriad

not groestl²

[assortedheater]

I think that is an electronic money used Proof of Work, no existing ASIC for Groestl & unlikely that it will soon be developed for it. Groestlcoin ASIC will be free in the near future. Through these features, manifested Groestlcoin dispersants and dispersed quite of Cryptocurrency. Anyone can be exploited efficiently, with minimal resource consumption and nuisance. With a series of benefits that bring the project will satisfy users and attract participants.

[yyz13857180757]

The Groestlcoin project team is working hard, and the medium and long term development of the Groestlcoin project is worth investor's attention.

[tirthraj]

The Groestlcoin project team is working hard, and the medium and long term development of the Groestlcoin project is worth investor's attention.

Yes. but it will take 6 months or year time if my observation is right.

[IMZ Noo Account]

Project Venezuela is quietly progressing

[irwanjabryg]

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.

[jackielove4u]

waitin for 2.16.3 binaries on github, right now i see only checksums, thx

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

[gruve_p]

A new major Groestlcoin Core version 2.16.3 is now available for download which includes both a Denial of Service component and a critical inflation vulnerability, so it is recommended to upgrade to it if you are running a full Groestlcoin node or a local Groestlcoin Core wallet.

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

[gruve_p]

GRSPay Testnet: a free and open-source cryptocurrency payment processor which allows you to receive payments in Groestlcoin Testnet with no fees, transaction cost or a middleman.

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: groestlcoin@gmail.com
3. Post reports of errors in this topic.

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

[gruve_p]

GRSPay: a free and open-source cryptocurrency payment processor which allows you to receive payments in Groestlcoin with no fees, transaction cost or a middleman.

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: groestlcoin@gmail.com
3. Post reports of errors in this topic.

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

[gruve_p]

Groestlcoin bech32 paperwallet: A simple groestlcoin paper wallet generator that utilizes Native Segregated Witness (SegWit) Pay To Witness Public Key Hash (P2WPKH) addresses and transactions.

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: groestlcoin@gmail.com
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

[gruve_p]

Groestlcoin p2sh paperwallet: A simple groestlcoin paper wallet generator that utilizes Segregated Witness (SegWit) Pay To Witness Public Key Hash (P2WPKH) addresses and transactions.

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: groestlcoin@gmail.com
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

[gruve_p]

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

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

Changelog 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: groestlcoin@gmail.com
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

[gruve_p]

Groestlcoin Sentinel Testnet is the easiest and fastest way to track/receive/watch payments in your offline Groestlcoin Testnet Wallets. Groestlcoin Sentinel Testnet is compatible with any standard Groestlcoin Testnet address, BIP44 TPUB (Extended Public Key) BIP49 UPUB and BIP84 VPUB.

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://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: hashengineeringsolutions@gmail.com
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

[gruve_p]

Groestlcoin Sentinel Testnet is the easiest and fastest way to track/receive/watch payments in your offline Groestlcoin Testnet Wallets. Groestlcoin Sentinel Testnet is compatible with any standard Groestlcoin Testnet address, BIP44 TPUB (Extended Public Key) BIP49 UPUB and BIP84 VPUB.

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://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: hashengineeringsolutions@gmail.com
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

[gruve_p]

Groestlcoin Sentinel is the easiest and fastest way to track/receive/watch payments in your offline Groestlcoin Wallets. Groestlcoin Sentinel is compatible with any standard Groestlcoin address, BIP44 XPUB (Extended Public Key) BIP49 YPUB and BIP84 ZPUB.

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://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: hashengineeringsolutions@gmail.com
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

[gruve_p]

Groestlcoin Sentinel is the easiest and fastest way to track/receive/watch payments in your offline Groestlcoin Wallets. Groestlcoin Sentinel is compatible with any standard Groestlcoin address, BIP44 XPUB (Extended Public Key) BIP49 YPUB and BIP84 ZPUB.

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://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: hashengineeringsolutions@gmail.com
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

[gruve_p]

Groestlcoin EasyVanity:This Windows app is built from the ground-up in and makes it easier than ever before to create your very own bespoke Groestlcoin address(es), even whilst not connected to the internet! You can even generate multiple keys with the same prefix and leave it on overnight whilst your CPU or GPU collects and stores these addresses locally.

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: yokomoko@groestlcoin.org
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