Messages

Instant HTML5 Android Groestlcoin JSwallet, only controlled by you.

Groestlcoin is excited to announce our new HTML5 instant wallet, JSWallet. We've listened to the community and have created a fast, easy, sexy wallet for Android.
                                   
Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins as all keys and info are stored client-side. Moreover, should our site ever go offline your wallet can be easily imported into another wallet system.
                                   
Create a wallet in under 5 seconds by moving your finger on the device without having to provide any user information. The client-side input of the motions generate entropy (randomness) which is couple with a random generator to create a Groestlcoin wallet.

You can consider JSWallet a hot wallet where your secret URL is your key, a key that can be further secured with a password should you so choose. JSWallet generates a brand new wallet with a public key. Look in the URL/address bar and you will see a random-looking string starting with '#' or hash – the code after the hash is your brain wallet seed, and is a 'secret link' not visible anywhere other than on your local browser. Either copy the full URL somewhere safe or bookmark it for future access.

Features
• No logins required
• Optional passwords
• Works on multiple devices
• Create a brainwallet
• Groestlcoins stored on client-side
• Written in HTML5
• Takes only 5 seconds
• Set your preferred fiat currency
• Export private key
• Export brainwallet key
• Set custom fee
• Easter egg 1 (fake send): Enter "vapor" in the amount box
• Easter egg 2 (huge balance): Enter "ballin" in the amount box
• Easter egg 3 (huge balance with sound): Enter "baron" in the amount box
• Easter egg 4 (play turn down for what): Enter "tdfw" in the amount box
• Easter egg 5 (stop playing sound): Enter "stop" in the amount box

Create your own URL by using a brainwallet. A brainwallet refers to a random passphrase that only you know. This allows you to easily remember your URL and type it on any browser to retrieve your wallet. Choosing a secure passphrase is critical. Typically a good passphrase is:
• At least 10 words long
• Use letters, capitals, numbers, and spaces
• Never been written in a book, song, or password system
• Easy for you to remember
• Impossible for someone to guess

It is appreciated if feedback of the following is provided:
1.  Can you receive coins? (small amounts to avoid losing them)
2.  Can you send coins?
3.  Can you scan a QR code from another phone?
4.  Do you hear a sound when sending and receiving?
5.  Does it work on all (mobile) browsers?
6.  Does the transaction takes couple of seconds??
7.  Does it calculate exchange rates properly?

Important:
Export your private key

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.

Groestlcoin JSWallet is available in the Google play store:
https://play.google.com/store/apps/details?id=org.groestlcoin.walletjs

Source code:
https://github.com/Groestlcoin/grs-rush-wallet-android

Instant HTML5 cross-platform Groestlcoin wallet, only controlled by you.

Groestlcoin is excited to announce our new HTML5 instant wallet, JSWallet. We've listened to the community and have created a fast, easy, sexy wallet that is cross-browser and platform compatible.
                                   
Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins as all keys and info are stored client-side. Moreover, should our site ever go offline your wallet can be easily imported into another wallet system.
                                   
Create a wallet in under 5 seconds by moving your mouse around the screen (or finger on touch devices) without having to provide any user information. The client-side input of the motions generate entropy (randomness) which is couple with a random generator to create a Groestlcoin wallet.

You can consider JSWallet a hot wallet where your secret URL is your key, a key that can be further secured with a password should you so choose. JSWallet generates a brand new wallet with a public key. Look in the URL/address bar and you will see a random-looking string starting with '#' or hash – the code after the hash is your brain wallet seed, and is a 'secret link' not visible anywhere other than on your local browser. Either copy the full URL somewhere safe or bookmark it for future access.

Changelog:
• Use Bittrex ticker
• Removed some fiat currencies
• Use low 's' values for signatures
• Changed favicon
• Enable CORS
• Reveal Easter egg 1 (fake send): Enter "vapor" in the amount box
• Reveal Easter egg 2 (huge balance): Enter "ballin" in the amount box
• Reveal Easter egg 3 (huge balance with sound): Enter "baron" in the amount box
• Reveal Easter egg 4 (play turn down for what): Enter "tdfw" in the amount box
• Reveal Easter egg 5 (stop playing sound): Enter "stop" in the amount box

Features
• No logins required
• Optional passwords
• Works on multiple devices
• Create a brainwallet
• Groestlcoins stored on client-side
• Written in HTML5
• Takes only 5 seconds
• Set your preferred fiat currency
• Export private key
• Export brainwallet key
• Set custom fee

Create your own URL by using a brainwallet. A brainwallet refers to a random passphrase that only you know. This allows you to easily remember your URL and type it on any browser to retrieve your wallet. Choosing a secure passphrase is critical. Typically a good passphrase is:
• At least 10 words long
• Use letters, capitals, numbers, and spaces
• Never been written in a book, song, or password system
• Easy for you to remember
• Impossible for someone to guess

It is appreciated if feedback of the following is provided:
1.  Can you receive coins? (small amounts to avoid losing them)
2.  Can you send coins?
3.  Can you scan a QR code from another phone?
4.  Do you hear a sound when sending and receiving?
5.  Does it work on all (mobile) browsers?
6.  Does the transaction takes couple of seconds??
7.  Does it calculate exchange rates properly?

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

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

Create yours at jswallet.groestlcoin.org

Source code:
https://github.com/Groestlcoin/grs-rush-wallet - JSwallet running in node.js

Groestlpay is a secure open source, multisignature wallet platform for both desktop and mobile devices. Groestlpay is free and open source software run on non-proprietary servers, so there's no need to rely on anybody for continuous support.

Manage shared funds with friends and coworkers. Share a wallet with your child and introduce them to groestlcoin. Groestlpay makes sharing a wallet simple and secure.
Groestlpay users can hold funds individually or share finances securely with other users with multisignature wallets, which prevent unauthorized payments by requiring multiple approvals. Here are some ways Groestlpay can be used with others:
- To save for vacations or joint purchases with friends
- To track family spending and allowances
- To manage business, club, or organization funds and expenses

Features:
• Multiple wallet creation and management in-app. Groestlpay is a true Groestlcoin wallet, not an account service. Secure your personal funds with multiple signatures, or just one.
• Intuitive, multisignature security for personal or shared wallets. Take security into your own hands and avoid trusting third parties with your savings. Like a joint-checking account, your Groestlpay wallet can have multiple users. To send money, the group approves each transaction.
• Easy spending proposal flow for shared wallets and group payments.
• BIP32 Hierarchical deterministic (HD) address generation and wallet backups. Manage personal and business wallets easily, all without leaving the app. Groestlpay uses hierarchical-deterministic (HD) wallets, allowing for secure in-app wallet generation and backup.
• Device-based security: all private keys are stored locally, not in the cloud. The Groestlpay app securely stores multiple, distinct groestlcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated.
• Synchronous access across all major mobile and desktop platforms.
• Payment protocol (BIP70-BIP73) support: easily-identifiable payment requests and verifiable, secure groestlcoin payments. Groestlpay is one of the first Groestlcoin wallets to support the full Groestlcoin Payment Protocol (BIP 0070-0073). When you send money to a Payment Protocol-enabled merchant, Groestlpay securely verifies that your payment will go to the right place.
• Support for over 150 currency pricing options and unit denomination in GRS or uGRS.
• Mnemonic (BIP39) support for wallet backups.
• Paper wallet sweep support (BIP38).
• Customizable wallet naming and background colors.
• Multiple languages supported, including French, Italian, German, Polish, Russian, Chinese (Simplified), and Spanish.
• Available for iOS, Android, Chrome OS, Linux, Windows and OS X devices
• Open Source. Not only is the Groestlpay app open source, the server is too. Enterprise and power users can take full control of their finances by deploying their own version of the Groestpay apps and Groestlcore Wallet Service.
• Support for using unconfirmed funds.
• Fingerprint support for iOS and Android.
• Spending password support.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from a phone?
4. Does it calculate exchange rates properly?
5. How fast is a transaction?
6. Can you sweep a paperwallet?
7. Are you able to create a shared wallet?
8. Are you able to join a shared wallet?
9. Are you able to give your wallet an alias?
10. Are you able to change the color of your wallet?
11. Are you able to backup your wallet?
12. Does the spending password feature work?
13. Are you able to export wallet?
14. Are you able to import wallet?
15. Are you able to see your transactions on groestlsight?
16. Are you able to place comments on your transactions?
17. Are you able to use fingerprint scan?

WARNING:
installation on jailbroken devices is strongly discouraged

Important:
When using Groestlpay, please store your secret phrase somewhere safe! Then your coins can be retrieved even if you loose your device. Furthermore, this puts the user in total control of their funds at any given time.

Groestlpay 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 groestlsight, no compensation will be given. Use Groestlpay 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.

Download link: https://itunes.apple.com/US/app/groestlpay/id1225131227?mt=8

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

Groestlpay is a secure open source, multisignature wallet platform for both desktop and mobile devices. Groestlpay is free and open source software run on non-proprietary servers, so there's no need to rely on anybody for continuous support.

Manage shared funds with friends and coworkers. Share a wallet with your child and introduce them to groestlcoin. Groestlpay makes sharing a wallet simple and secure.
Groestlpay users can hold funds individually or share finances securely with other users with multisignature wallets, which prevent unauthorized payments by requiring multiple approvals. Here are some ways Groestlpay can be used with others:
- To save for vacations or joint purchases with friends
- To track family spending and allowances
- To manage business, club, or organization funds and expenses

Features:
• Multiple wallet creation and management in-app. Groestlpay is a true Groestlcoin wallet, not an account service. Secure your personal funds with multiple signatures, or just one.
• Intuitive, multisignature security for personal or shared wallets. Take security into your own hands and avoid trusting third parties with your savings. Like a joint-checking account, your Groestlpay wallet can have multiple users. To send money, the group approves each transaction.
• Easy spending proposal flow for shared wallets and group payments.
• BIP32 Hierarchical deterministic (HD) address generation and wallet backups. Manage personal and business wallets easily, all without leaving the app. Groestlpay uses hierarchical-deterministic (HD) wallets, allowing for secure in-app wallet generation and backup.
• Device-based security: all private keys are stored locally, not in the cloud. The Groestlpay app securely stores multiple, distinct groestlcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated.
• Synchronous access across all major mobile and desktop platforms.
• Payment protocol (BIP70-BIP73) support: easily-identifiable payment requests and verifiable, secure groestlcoin payments. Groestlpay is one of the first Groestlcoin wallets to support the full Groestlcoin Payment Protocol (BIP 0070-0073). When you send money to a Payment Protocol-enabled merchant, Groestlpay securely verifies that your payment will go to the right place.
• Support for over 150 currency pricing options and unit denomination in GRS or uGRS.
• Mnemonic (BIP39) support for wallet backups.
• Paper wallet sweep support (BIP38).
• Customizable wallet naming and background colors.
• Multiple languages supported, including French, Italian, German, Polish, Russian, Chinese (Simplified), and Spanish.
• Available for iOS, Android, Chrome OS, Linux, Windows and OS X devices
• Open Source. Not only is the Groestlpay app open source, the server is too. Enterprise and power users can take full control of their finances by deploying their own version of the Groestpay apps and Groestlcore Wallet Service.
• Support for using unconfirmed funds.
• Fingerprint support for iOS and Android.
• Spending password support.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from a phone?
4. Does it calculate exchange rates properly?
5. How fast is a transaction?
6. Can you sweep a paperwallet?
7. Are you able to create a shared wallet?
8. Are you able to join a shared wallet?
9. Are you able to give your wallet an alias?
10. Are you able to change the color of your wallet?
11. Are you able to backup your wallet?
12. Does the spending password feature work?
13. Are you able to export wallet?
14. Are you able to import wallet?
15. Are you able to see your transactions on groestlsight?
16. Are you able to place comments on your transactions?
17. Are you able to use fingerprint scan?

WARNING:
installation on rooted devices is strongly discouraged

Important:
When using Groestlpay, please store your secret phrase somewhere safe! Then your coins can be retrieved even if you loose your device. Furthermore, this puts the user in total control of their funds at any given time.

Groestlpay 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 groestlsight, no compensation will be given. Use Groestlpay 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.

Download link: https://play.google.com/store/apps/details?id=org.groestlcoin.groestlpay

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

Groestlpay is a secure open source, multisignature wallet platform for both desktop and mobile devices. Groestlpay is free and open source software run on non-proprietary servers, so there's no need to rely on anybody for continuous support.

Manage shared funds with friends and coworkers. Share a wallet with your child and introduce them to groestlcoin. Groestlpay makes sharing a wallet simple and secure.
Groestlpay users can hold funds individually or share finances securely with other users with multisignature wallets, which prevent unauthorized payments by requiring multiple approvals. Here are some ways Groestlpay can be used with others:
- To save for vacations or joint purchases with friends
- To track family spending and allowances
- To manage business, club, or organization funds and expenses

Features:
• Multiple wallet creation and management in-app. Groestlpay is a true Groestlcoin wallet, not an account service. Secure your personal funds with multiple signatures, or just one.
• Intuitive, multisignature security for personal or shared wallets. Take security into your own hands and avoid trusting third parties with your savings. Like a joint-checking account, your Groestlpay wallet can have multiple users. To send money, the group approves each transaction.
• Easy spending proposal flow for shared wallets and group payments.
• BIP32 Hierarchical deterministic (HD) address generation and wallet backups. Manage personal and business wallets easily, all without leaving the app. Groestlpay uses hierarchical-deterministic (HD) wallets, allowing for secure in-app wallet generation and backup.
• Device-based security: all private keys are stored locally, not in the cloud. The Groestlpay app securely stores multiple, distinct groestlcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated.
• Synchronous access across all major mobile and desktop platforms.
• Payment protocol (BIP70-BIP73) support: easily-identifiable payment requests and verifiable, secure groestlcoin payments. Groestlpay is one of the first Groestlcoin wallets to support the full Groestlcoin Payment Protocol (BIP 0070-0073). When you send money to a Payment Protocol-enabled merchant, Groestlpay securely verifies that your payment will go to the right place.
• Support for over 150 currency pricing options and unit denomination in GRS or uGRS.
• Mnemonic (BIP39) support for wallet backups.
• Paper wallet sweep support (BIP38).
• Customizable wallet naming and background colors.
• Multiple languages supported, including French, Italian, German, Polish, Russian, Chinese (Simplified), and Spanish.
• Available for iOS, Android, Chrome App, Linux, Windows and OS X devices
• Open Source. Not only is the Groestlpay app open source, the server is too. Enterprise and power users can take full control of their finances by deploying their own version of the Groestpay apps and Groestlcore Wallet Service.
• Support for using unconfirmed funds.
• Fingerprint support for iOS and Android.
• Spending password support.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from a phone?
4. Does it calculate exchange rates properly?
5. How fast is a transaction?
6. Can you sweep a paperwallet?
7. Are you able to create a shared wallet?
8. Are you able to join a shared wallet?
9. Are you able to give your wallet an alias?
10. Are you able to change the color of your wallet?
11. Are you able to backup your wallet?
12. Does the spending password feature work?
13. Are you able to export wallet?
14. Are you able to import wallet?
15. Are you able to see your transactions on groestlsight?
16. Are you able to place comments on your transactions?

Important:
When using Groestlpay, please store your secret phrase somewhere safe! Then your coins can be retrieved even if you loose your device. Furthermore, this puts the user in total control of their funds at any given time.

Groestlpay 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 groestlsight, no compensation will be given. Use Groestlpay 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.

You can download it using the links below and be up and running with Groestlpay in 5 minutes.
Download the Linux wallet here: https://github.com/Groestlcoin/GroestlPay/releases/download/v1.0.2-grs/Groestlpay-linux.zip
Download the OSX DMG Wallet here: https://github.com/Groestlcoin/GroestlPay/releases/download/v1.0.2-grs/Groestlpay-osx.dmg
Download the Windows Wallet here: https://github.com/Groestlcoin/GroestlPay/releases/download/v1.0.2-grs/Groestlpay-win.exe


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

Groestlpay is a secure open source, multisignature wallet platform for both desktop and mobile devices. Groestlpay is free and open source software run on non-proprietary servers, so there's no need to rely on anybody for continuous support.

Manage shared funds with friends and coworkers. Share a wallet with your child and introduce them to groestlcoin. Groestlpay makes sharing a wallet simple and secure.
Groestlpay users can hold funds individually or share finances securely with other users with multisignature wallets, which prevent unauthorized payments by requiring multiple approvals. Here are some ways Groestlpay can be used with others:
- To save for vacations or joint purchases with friends
- To track family spending and allowances
- To manage business, club, or organization funds and expenses

Features:
• Multiple wallet creation and management in-app. Groestlpay is a true Groestlcoin wallet, not an account service. Secure your personal funds with multiple signatures, or just one.
• Intuitive, multisignature security for personal or shared wallets. Take security into your own hands and avoid trusting third parties with your savings. Like a joint-checking account, your Groestlpay wallet can have multiple users. To send money, the group approves each transaction.
• Easy spending proposal flow for shared wallets and group payments.
• BIP32 Hierarchical deterministic (HD) address generation and wallet backups. Manage personal and business wallets easily, all without leaving the app. Groestlpay uses hierarchical-deterministic (HD) wallets, allowing for secure in-app wallet generation and backup.
• Device-based security: all private keys are stored locally, not in the cloud. The Groestlpay app securely stores multiple, distinct groestlcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated.
• Synchronous access across all major mobile and desktop platforms.
• Payment protocol (BIP70-BIP73) support: easily-identifiable payment requests and verifiable, secure groestlcoin payments. Groestlpay is one of the first Groestlcoin wallets to support the full Groestlcoin Payment Protocol (BIP 0070-0073). When you send money to a Payment Protocol-enabled merchant, Groestlpay securely verifies that your payment will go to the right place.
• Support for over 150 currency pricing options and unit denomination in GRS or uGRS.
• Mnemonic (BIP39) support for wallet backups.
• Paper wallet sweep support (BIP38).
• Customizable wallet naming and background colors.
• Multiple languages supported, including French, Italian, German, Polish, Russian, Chinese (Simplified), and Spanish.
• Available for iOS, Android, Chrome OS, Linux, Windows and OS X devices
• Open Source. Not only is the Groestlpay app open source, the server is too. Enterprise and power users can take full control of their finances by deploying their own version of the Groestpay apps and Groestlcore Wallet Service.
• Support for using unconfirmed funds.
• Fingerprint support for iOS and Android.
• Spending password support.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from a phone?
4. Does it calculate exchange rates properly?
5. How fast is a transaction?
6. Can you sweep a paperwallet?
7. Are you able to create a shared wallet?
8. Are you able to join a shared wallet?
9. Are you able to give your wallet an alias?
10. Are you able to change the color of your wallet?
11. Are you able to backup your wallet?
12. Does the spending password feature work?
13. Are you able to export wallet?
14. Are you able to import wallet?
15. Are you able to see your transactions on groestlsight?
16. Are you able to place comments on your transactions?

Important:
When using Groestlpay, please store your secret phrase somewhere safe!! Then your coins can be retrieved even if you loose your device. Furthermore, this puts the user in total control of their funds at any given time.
This app runs only on Chrome OS.

Groestlpay 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 groestlsight, no compensation will be given. Use Groestlpay 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.

Groestlpay is available on Chrome OS via https://chrome.google.com/webstore/detail/groestlpay/afjhgbdchdpacedpjdpdchnmoanbblph

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

Groestlpay is a secure open source, multisignature wallet platform for both desktop and mobile devices. Groestlpay is free and open source software run on non-proprietary servers, so there's no need to rely on anybody for continuous support.

Manage shared funds with friends and coworkers. Share a wallet with your child and introduce them to groestlcoin. Groestlpay makes sharing a wallet simple and secure.
Groestlpay users can hold funds individually or share finances securely with other users with multisignature wallets, which prevent unauthorized payments by requiring multiple approvals. Here are some ways Groestlpay can be used with others:
- To save for vacations or joint purchases with friends
- To track family spending and allowances
- To manage business, club, or organization funds and expenses

Features:
• Multiple wallet creation and management in-app. Groestlpay is a true Groestlcoin wallet, not an account service. Secure your personal funds with multiple signatures, or just one.
• Intuitive, multisignature security for personal or shared wallets. Take security into your own hands and avoid trusting third parties with your savings. Like a joint-checking account, your Groestlpay wallet can have multiple users. To send money, the group approves each transaction.
• Easy spending proposal flow for shared wallets and group payments.
• BIP32 Hierarchical deterministic (HD) address generation and wallet backups. Manage personal and business wallets easily, all without leaving the app. Groestlpay uses hierarchical-deterministic (HD) wallets, allowing for secure in-app wallet generation and backup.
• Device-based security: all private keys are stored locally, not in the cloud. The Groestlpay app securely stores multiple, distinct groestlcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated.
• Synchronous access across all major mobile and desktop platforms.
• Payment protocol (BIP70-BIP73) support: easily-identifiable payment requests and verifiable, secure groestlcoin payments. Groestlpay is one of the first Groestlcoin wallets to support the full Groestlcoin Payment Protocol (BIP 0070-0073). When you send money to a Payment Protocol-enabled merchant, Groestlpay securely verifies that your payment will go to the right place.
• Support for over 150 currency pricing options and unit denomination in GRS or uGRS.
• Mnemonic (BIP39) support for wallet backups.
• Paper wallet sweep support (BIP38).
• Customizable wallet naming and background colors.
• Multiple languages supported, including French, Italian, German, Polish, Russian, Chinese (Simplified), and Spanish.
• Available for iOS, Android, Chrome OS, Linux, Windows and OS X devices
• Open Source. Not only is the Groestlpay app open source, the server is too. Enterprise and power users can take full control of their finances by deploying their own version of the Groestpay apps and Groestlcore Wallet Service.
• Support for using unconfirmed funds.
• Fingerprint support for iOS and Android.
• Spending password support.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from a phone?
4. Does it calculate exchange rates properly?
5. How fast is a transaction?
6. Can you sweep a paperwallet?
7. Are you able to create a shared wallet?
8. Are you able to join a shared wallet?
9. Are you able to give your wallet an alias?
10. Are you able to change the color of your wallet?
11. Are you able to backup your wallet?
12. Does the spending password feature work?
13. Are you able to export wallet?
14. Are you able to import wallet?
15. Are you able to see your transactions on groestlsight?
16. Are you able to place comments on your transactions?

Important:
When using Groestlpay, please store your secret phrase somewhere safe! Then your coins can be retrieved even if you loose your device. Furthermore, this puts the user in total control of their funds at any given time.

Groestlpay 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 groestlsight, no compensation will be given. Use Groestlpay 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.

Groestlpay webwallet is available via https://groestlpay.groestlcoin.org/

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

Groestlsight is an open-source Groestlcoin blockchain explorer with complete REST and websocket APIs that can be used for writing web wallets and other apps that need more advanced blockchain queries than provided by groestlcoind RPC.

Groestlsight REST API provides you with a convenient, powerful and simple way to read data from the groestlcoin network and build your own services with it.

Features
• Support to verify signed messages online. Verify that a message comes from a specific Groestlcoin address.
• Support to broadcast transactions online. Broadcast a raw transaction in hex format over the Groestlcoin network.
• Multiple languages supported, including Japanese, German and Spanish.
• Fast - Fast navigation using client side javascript rendering with AngularJS.
• Mined by - Check which pool mined the block.
• Multiple platforms - Supports all browsers
• API - Complete REST and Websocket API for quering blocks, transactions, and addresses; and receiving live updates
• Light - Thin data model using groestlcoind RPC interfase to validate blockchain information. Fast groestlcoind blockchain syncronization (~1hrs for the entire livenet), using LevelDB for data storage and, optionally, raw groestlcoind data files processing.
• Exhaustive - Reports on double spend attempts, outpoints confirmations, outputs spend status reports. Input and Outputs hyperlinks in transactions. Extended view in transactions to show advance details.
• Open source - Opensourced, written in node.js and based on the powerful groestlcore nodejs library.

It is appreciated if feedback of the following is provided:
1. Can you verify signed messages?
2. Can you broadcast a raw transaction?

Groestlsight 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 groestlsight, no compensation will be given. Use groestlsight 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.

Groestlsight is available via http://groestlsight.groestlcoin.org/

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

Groestlcoin is excited to announce our first ios wallet, groestlwallet.

We've listened to the community and have created a fast, easy, sexy wallet.
Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins. Moreover, should groestlwallet ever get removed from the app store it can be easily imported into the Android version of groestlwallet or MultiGroestl HD.

Groestlwallet is designed to protect you from malware, browser security holes, even physical theft. With AES hardware encryption, app sandboxing, keychain and code signatures, groestlwallet represents a significant security advance over web and desktop wallets, and other mobile platforms.
Simplicity is groestlwallet's core design principle. Because groestlwallet is "deterministic", your balance and entire transaction history can be restored from just your recovery phrase.

Groestlwallet implementations:
BIP-0032 to implement a hierarchical deterministic wallet
BIP-0039 to implement a mnemonic code of mnemonic sentence for the generation of deterministic wallets (process for turning in into a BIP-0032 seed)

Features:
• Send and receive coin payments in seconds, online or in person
• One button payments to coin-accepting merchants and websites
• Store your coins safely and securely using built in hardware encryption
• Simple recovery phrase enables you to recover funds when your device is lost or broken
• Direct network client - no servers to get hacked or go down
• Simplified payment verification for fast mobile performance
• No server to get hacked or go down
• Single backup phrase that works forever
• Private keys never leave your device
• Import (password protected) paper wallets
• Payment protocol payee identity certification
• Intuitive design
• Multiple languages
• Check balances of a public address
• Multiple local currencies support

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from a phone?
4. Does it calculate exchange rates properly?
5. How fast is a transaction?
6. Can you sweep a paperwallet?
7. Are you able to check a balance of a public address?

WARNING:
installation on jailbroken devices is strongly discouraged

Important:
When using this app, please store your secret phrase somewhere safe! Then your coins can be retrieved even if you loose your phone. Furthermore, this puts the user in total control of their funds at any given time.

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.

Download link: https://itunes.apple.com/us/app/groestlwallet/id1185311702?mt=8

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

Groestlcoin is excited to announce our Android variant of groestlwallet.

We've listened to the community and have created a fast, easy, sexy wallet.
Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins. Moreover, should groestlwallet ever get removed from Google Play it can be easily imported into the iOS version of groestlwallet or MultiGroestl HD.

Groestlwallet is designed to protect you from malware, browser security holes, even physical theft. With AES hardware encryption, app sandboxing, keychain and code signatures, groestlwallet represents a significant security advance over web and desktop wallets, and other mobile platforms.
Simplicity is groestlwallet's core design principle. Because groestlwallet is "deterministic", your balance and entire transaction history can be restored from just your recovery phrase.

Groestlwallet implementations:
BIP-0032 to implement a hierarchical deterministic wallet
BIP-0039 to implement a mnemonic code of mnemonic sentence for the generation of deterministic wallets (process for turning in into a BIP-0032 seed)

Features:
• Send and receive coin payments in seconds, online or in person
• One button payments to coin-accepting merchants and websites
• Store your coins safely and securely using built in hardware encryption
• Simple recovery phrase enables you to recover funds when your device is lost or broken
• Direct network client - no servers to get hacked or go down
• Simplified payment verification for fast mobile performance
• No server to get hacked or go down
• Single backup phrase that works forever
• Private keys never leave your device
• Import (password protected) paper wallets
• Payment protocol payee identity certification
• Intuitive design

It is appreciated if feedback of the following is provided:
1.  Can you receive coins? (small amounts to avoid losing them)
2.  Can you send coins?
3.  Can you scan a QR code from a phone?
4.  Does it calculate exchange rates properly?
5.  How fast is a transaction?
6. Can you sweep a paperwallet?

WARNING:
installation on rooted devices is strongly discouraged

Important:
When using this app, please store your secret phrase somewhere safe! Then your coins can be retrieved even if you loose your phone. Furthermore, this puts the user in total control of their funds at any given time.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

Download link: https://play.google.com/store/apps/details?id=hashengineering.groestlcoin.groestlwallet

Source code: https://github.com/Groestlcoin/groestlwallet-android

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.

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

Live version available at http://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?

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

Groestlcoinomi is a lightweight "thin client" Groestlcoin wallet based on a client-server protocol. Its main advantages over the Groestlcoin Core wallet include support for not requiring to sync with the blockchain.

In order to bring Groestlcoin to the mainstream masses the Groestlcoinomi is ready for testing. The app allows you to send and receive Groestlcoins on your device without syncing the blockchain. When using this app, please store your secret phrase and email them to yourself! Then your coins can be retrieved even if you loose your phone. Furthermore, this puts the user in total control of their funds at any given time.

Groestlcoinomi implementations:
BIP-0032 to implement a hierarchical deterministic wallet
BIP-0039 to implement a mnemonic code of mnemonic sentence for the generation of deterministic wallets (process for turning in into a BIP-0032 seed)

Features
• Show ammount in USD
• Added ability to spend own unconfirmed change funds
• Manual receiving address management (enable in settings)
• Wallet only needs to be backed up once, on initial creation
• Wallet backup consists of simple list of 12 common words (BIP-0039)
• Automatic connectivity management with fast reconnects and detection of network change
• Password protect your recovery phrase
• Support payment URIs requests from browsers and other apps

It is appreciated if feedback of the following is provided:
1.  Can you receive coins? (small amounts to avoid losing them)
2.  Can you send coins?
3.  Can you scan a QR code from a phone?
4.  Does it calculate exchange rates properly?
5.  How fast is a transaction?

Important:
Store your secret phrase somewhere safe!

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.

You can download it using the links below and be up and running with Groestlcoin in 5 minutes.
Download the Linux wallet here: https://github.com/Groestlcoin/electrum-grs-lite/releases/download/v1.1/groestlcoinomi_unix_1_1.sh
Download the OSX DMG Wallet here: https://github.com/Groestlcoin/electrum-grs-lite/releases/download/v1.1/groestlcoinomi_macos_1_1.dmg
Download the Windows Wallet here: https://github.com/Groestlcoin/electrum-grs-lite/releases/download/v1.1/groestlcoinomi_windows-x64_1_1.exe

Source code:
https://github.com/Groestlcoin/groestlcoinj - Groestlcoin Java Library
https://github.com/Groestlcoin/electrum-grs-lite - Groestlcoinomi

[Pool operators, P2Pool and solo miners especially because by default, Groestlcoin Core automatically set and unsets version bits as required.The deployment sets the block version number to 0x20000023 between midnight 21th Jan 2017 and midnight 21th June 2017 to signal readiness for deployment. The version number consists of 0x20000000 to indicate version bits together with setting bit 0, bit 1 and bit 5 to indicate support for this combined deployment, shown as "csv", "segwit" and "bip65" in the "getblockchaininfo" RPC call. Please note it will keep generating blocks with version 0x20000023 until "csv", "segwit" and "bip65" are activated at which point is will automatically unset bit 0, bit 1 and bit 5.All pools, services, exchanges are already upgraded.We would like to thank everybody for a smooth and fast upgrade (in no particular order):SuprnovaDwarfpoolZpoolMiningpoolhubCoinmine.plChainzBchainCryptoguruFogifyBittrexCryptopia]

A new major Groestlcoin Core version 2.13.3 is now available for download bringing both new features and bug fixes, so it is recommended to upgrade to it if you are running a full Groestlcoin node or a local Groestlcoin Core wallet.

v2.13.3 is now the official release version of Groestlcoin Core. On top of the new features and performance improvements, this update contains very important security fixes. It is recommended to upgrade to this version as soon as possible.

Pool operators, P2Pool and solo miners especially because by default, Groestlcoin Core automatically set and unsets version bits as required.
The deployment sets the block version number to 0x20000023 between midnight 21th Jan 2017 and midnight 21th June 2017 to signal readiness for deployment. The version number consists of 0x20000000 to indicate version bits together with setting bit 0, bit 1 and bit 5 to indicate support for this combined deployment, shown as "csv", "segwit" and "bip65" in the "getblockchaininfo" RPC call. Please note it will keep generating blocks with version 0x20000023 until "csv", "segwit" and "bip65" are activated at which point is will automatically unset bit 0, bit 1 and bit 5.

All pools, services, exchanges are already upgraded.
We would like to thank everybody for a smooth and fast upgrade (in no particular order):
Suprnova
Dwarfpool
Zpool
Miningpoolhub
Coinmine.pl
Chainz
Bchain
Cryptoguru
Fogify
Bittrex
Cryptopia

What's new in version v2.13.3?
This is a major release of Groestlcoin Core with many protocol level improvements and code optimizations, featuring the technical equivalent of Bitcoin v0.13.3 but with Groestlcoin specific patches. On a general level, most of what is new is the ability to roll out several soft forks at once, the greatly anticipated segregated witness (segwit) innovation, csv and BIP65.

Changelog:
• Qt dependency changed. Version upgraded to 5.7.1
• BerkeleyDB dependency changed. Version for Windows and MAC upgraded to 5.3.28 (9 September 2013).
• Blockversion bumped to 0x20000000 to get ready for BIP9 deployment.
• Alert keys removed.
• Extra DNS seed added.
• Hardcoded main seeds added.
• Hardcoded test seeds added.
• Installer comes now with Groestlcoin logo and uninstaller.
• New transaction cost mechanism.
• Chinese, Bulgarian, Russian, Ukrainian, Japanese and Arabic translation for Groestlcoin added.
• All possible languages updated.
• BIP9 - This BIP allows multiple soft fork changes to be deployed in parallel.
• BIP65 - This BIP allows a transaction output to be made unspendable until some point in the future.
• BIP68 - This BIP allows relative locktime enforcement through sequence numbers.
• BIP112 - This BIP is a proposal to redefine the semantics used in determining a time-locked transaction's eligibility for inclusion in a block. The median of the last 11 blocks is used instead of the block's timestamp, ensuring that it increases monotonically with each block.
• BIP113 - This BIP describes a new opcode (CHECKSEQUENCEVERIFY) for the groestlcoin scripting system that in combination with BIP68 allows execution pathways of a script to be restricted based on the age of the output being spent.
• BIP130 - This BIP adds a new message, "sendheaders", which indicates that a node prefers to receive new block announcements via a "headers" message rather than an "inv".
• BIP133 - This BIP adds a new message "feefilter", which serves to instruct peers not to send "inv"s to the node for transactions with fees below the specified fee rate.
• BIP141 - This BIP defines a new structure called a "witness" that is committed to blocks separated from the transaction merkle tree.
• BIP143 - This BIP contains the logic for signature verification for version 0 witness program.
• BIP144 - This BIP contains the logic for new messages and serialization formats for propagation of transactions and blocks committing to segregated witness structures.
• BIP147 - This BIP contains changes to the transaction validity rules to fix a malleability vector.
• BIP152 - This BIP add compact block relay to reduce the bandwidth required to propagate new blocks.
• Segregated witness soft fork. To allow for greater transaction output and mitigation of transaction malleability.
• Hierarchical Deterministic Key Generation. Groestlcoin Core will support hierarchical deterministic wallets, as described in BIP32, also known as HD wallets.
• Signature validation using libsecp256k1. ECDSA signatures inside Groestlcoin transactions now use validation using libsecp256k1 instead of OpenSSL.
• Wallet: Pruning. To reduce block size storage.
• Memory pool limiting. Better mempool filtering of transactions.
• Automatically use Tor hidden services. Inbuilt Tor control socket API support if Tor is running and also stream isolation for Tor communication.
• Option to reduce upload traffic. It is now possible to reduce the total upload traffic via the '-maxuploadtarget' parameter.
• Notifications through ZMQ. Groestlcoind can now (optionally) asynchronously notify clients through a ZMQ-based PUB socket of the arrival of new transactions and blocks.
• NODE_BLOOM  service bit. Support for the  NODE_BLOOM  service bit, as described in BIP 111, has been added to the P2P protocol code.
• Removal of internal miner. As CPU mining in the wallet has been useless for a long time, the internal miner has been removed in this release, and replaced with a simpler implementation for the test framework.
• Opt-in Replace-by-fee transactions. It is now possible to replace transactions in the transaction memory pool of Groestlcoin Core 2.13.3 nodes.
• RPC: SSL support dropped. SSL support for RPC, previously enabled by the option  rpcssl  has been dropped from both the client and the server. This was done for removing the dependency on OpenSSL for the daemon completely.
• Fix buffer overflow in bundled upnp. Bundled miniupnpc was updated to 1.9.20151008. This fixes a buffer overflow in the XML parser during initial network discovery.
• Test for LowS signatures before relaying. Make the node require the canonical 'low-s' encoding for ECDSA signatures when relaying or mining. This removes a nuisance malleability vector. Consensus behavior is unchanged.
• Windows bug fix for corrupted UTXO database on unclean shutdowns. This release no longer relies on memory-mapped files for the UTXO database, which significantly reduced the frequency of unclean shutdowns leading to required reindexes.
• RPC: Random-cookie RPC authentication. When no  -rpcpassword  is specified, the daemon now uses a special 'cookie' file for authentication. This file is generated with random content when the daemon starts, and deleted when it exits. Its contents are used as authentication token.
• Relay: Any sequence of pushdatas in OP_RETURN outputs now allowed. Previously OP_RETURN outputs with a payload were only relayed and mined if they had a single pushdata. This restriction has been lifted to allow any combination of data pushes and numeric constant opcodes (OP_1 to OP_16) after the OP_RETURN. The limit on OP_RETURN output size is now applied to the entire serialized scriptPubKey, 83 bytes by default. (the previous 80 byte default plus three bytes overhead).
• Relay: New and only new blocks relayed when pruning. When running in pruned mode, the client will now relay new blocks. When responding to the getblocks message, only hashes of blocks that are on disk and are likely to remain there for some reasonable time window (1 hour) will be returned (previously all relevant hashes were returned).
• Relay and Mining: Priority transactions. In Groestlcoin Core 2.13.3, when mempool limit has been reached a higher minimum relay fee takes effect to limit memory usage. Transactions which do not meet this higher effective minimum relay fee will not be relayed or mined even if they rank highly according to the priority heuristic.
• Wallet: Transaction fees. Various improvements have been made to how the wallet calculates transaction fees.
• Wallet: Negative confirmations and conflict detection. The wallet will now report a negative number for confirmations that indicates how deep in the block chain the conflict is found.
• Wallet: Merkle branches removed. Previously, every wallet transaction stored a Merkle branch to prove its presence in blocks. This wasn't being used for more than an expensive sanity check. Since 2.13.3, these are no longer stored. When loading a 2.13.2 wallet into an older version, it will automatically rescan to avoid failed checks.
• Option parsing behavior. Command line options are now parsed strictly in the order in which they are specified.
• RPC: Low-level API changes. Monetary amounts can be provided as strings. This means that for example the argument to sendtoaddress can be "0.0001" instead of 0.0001. This can be an advantage if a JSON library insists on using a lossy floating point type for numbers, which would be dangerous for monetary amounts.
• Database cache memory increased. The default was changed to 300 MiB in this release.
• Groestlcoin-cli: arguments privacy. The RPC command line client gained a new argument: "-stdin" to read extra arguments from standard input, one per line until EOF/Ctrl-D.
• Mining transaction selection ("Child Pays For Parent"). The mining transaction selection algorithm has been replaced with an algorithm that selects transactions based on their feerate inclusive of unconfirmed ancestor transactions.
• Reindexing changes. In earlier versions, reindexing did validation while reading through the block files on disk. These two have now been split up, so that all blocks are known before validation starts. This was necessary to make certain optimizations that are available during normal synchronizations also available during reindexing.
• New bytespersigop implementation.
• Change to wallet handling of mempool rejection.
• Low-level P2P changes. The optional new p2p message "feefilter" is implemented and the protocol version is bumped to 70015.
• Low-level RPC changes. Removed RPC commands: setgenerate, getgenerate. New RPC commands: generatetoaddress, importprunedfunds, removeprunedfunds, signmessagewithprivkey, getmempoolancestors, getmempooldescendants, getmempoolentry, createwitnessaddress, addwitnessaddress.
• Mining Code Changes. The mining code in 2.13.3 has been optimized to be significantly faster and use less memory. As part of these changes, consensus critical calculations are cached on a transaction's acceptance into the mempool and the mining code now relies on the consistency of the mempool to assemble blocks. However all blocks are still tested for validity after assembly.
• Other P2P Changes. The list of banned peers is now stored on disk rather than in memory. Restarting groestlcoind will no longer clear out the list of banned peers; instead a new RPC call (clearbanned) can be used to manually clear the list. The new setban RPC call can also be used to manually ban or unban a peer.

CSV, Segregated Witness and BIP65 Upgrade Information
The csv, segwit and BIP65 soft fork is fully backwards compatible with all Groestlcoin wallets, so you will continue to be able to safely send and receive groestlcoins whether or not csv, segwit and BIP65 is activated.

CSV, Segwit and BIP65 timeline:
• Signal: Miners will be able to signal that they are willing and able to enforce csv, segwit and BIP65 starting at the beginning of the first 2016 block retarget period on or after 21 January 2017 (UTC). In short signalling will start on block 1435392.
• Lock-in: Once 95% of blocks in a 2016 block long period have signaled that their miners are ready to enforce csv, segwit and BIP65 then csv, segwit and BIP65 will lock-in – meaning that unless the blockchain is rolled back at that point, csv, segwit and BIP65 will become active. In short Lock-in will be on block 1437408.
• Activate: After another 2016 block period, csv, segwit and BIP65 will activate, allowing miners to produce blocks containing csv, segwit and BIP65 transactions on Groestlcoin's mainnet. In short Activate will be on block 1439424. When segwit is activated, transaction-producing software will be able to separate (segregate) transaction signatures (witnesses) from the part of the data in a transaction that is covered by the txid.

Segwit benefits
1. Elimination of unwanted transaction malleability
Segregating the witness allows both existing and upgraded software to calculate the transaction identifier (txid) of transactions without referencing the witness, which can sometimes be changed by third-parties (such as miners) or by co-signers in a multisig spend. This solves all known cases of unwanted transaction malleability, which is a problem that makes programming Groestlcoin wallet software more difficult and which seriously complicates the design of smart contracts for Groestlcoin.
2. Capacity increase
Segwit transactions contain new fields that are not part of the data currently used to calculate the size of a block, which allows a block containing segwit transactions to hold more data than allowed by the current maximum block size. Estimates based on the transactions currently found in blocks indicate that if all wallets switch to using segwit, the network will be able to support about 70% more transactions. The network will also be able to support more of the advanced-style payments (such as multisig) than it can support now because of the different weighting given to different parts of a transaction after segwit activates (see the following section for details).
3. Weighting data based on how it affects node performance
Some parts of each Groestlcoin block need to be stored by nodes in order to validate future blocks; other parts of a block can be immediately forgotten (pruned) or used only for helping other nodes sync their copy of the block chain. One large part of the immediately prunable data are transaction signatures (witnesses), and segwit makes it possible to give a different "weight" to segregated witnesses to correspond with the lower demands they place on node resources. Specifically, each byte of a segregated witness is given a weight of 1, each other byte in a block is given a weight of 4, and the maximum allowed weight of a block is 4 million. Weighting the data this way better aligns the most profitable strategy for creating blocks with the long-term costs of block validation.
4. Signature covers value
A simple improvement in the way signatures are generated in segwit simplifies the design of secure signature generators (such as hardware wallets), reduces the amount of data the signature generator needs to download, and allows the signature generator to operate more quickly. This is made possible by having the generator sign the amount of bitcoins they think they are spending, and by having full nodes refuse to accept those signatures unless the amount of groestlcoins being spent is exactly the same as was signed. For non-segwit transactions, wallets instead had to download the complete previous transactions being spent for every payment they made, which could be a slow operation on hardware wallets and in other situations where bandwidth or computation speed was constrained.
5. Linear scaling of sighash operations
In 2015 a block in Bitcoin was produced that required about 25 seconds to validate on modern hardware because of the way transaction signature hashes are performed. Other similar blocks, or blocks that could take even longer to validate, can still be produced today. The problem that caused this can't be fixed in a soft fork without unwanted side-effects, but transactions that opt-in to using segwit will now use a different signature method that doesn't suffer from this problem and doesn't have any unwanted side-effects.
6. Increased security for multisig
Groestlcoin addresses (both P2PKH addresses that start with a 'F' and P2SH addresses that start with a '3') use a hash function known as RIPEMD-160. For P2PKH addresses, this provides about 160 bits of security---which is beyond what cryptographers believe can be broken today. But because P2SH is more flexible, only about 80 bits of security is provided per address. Although 80 bits is very strong security, it is within the realm of possibility that it can be broken by a powerful adversary. Segwit allows advanced transactions to use the Groestl hash function instead, which provides about 128 bits of security (that is 281 trillion times as much security as 80 bits and is equivalent to the maximum bits of security believed to be provided by Groestlcoin's choice of parameters for its Elliptic Curve Digital Security Algorithm [ECDSA].)
7. More efficient almost-full-node security
Satoshi Nakamoto's original Bitcoin paper describes a method for allowing newly-started full nodes to skip downloading and validating some data from historic blocks that are protected by large amounts of proof of work. Unfortunately, Nakamoto's method can't guarantee that a newly-started node using this method will produce an accurate copy of Groestlcoin's current ledger (called the UTXO set), making the node vulnerable to falling out of consensus with other nodes. Although the problems with Nakamoto's method can't be fixed in a soft fork, Segwit accomplishes something similar to his original proposal: it makes it possible for a node to optionally skip downloading some blockchain data (specifically, the segregated witnesses) while still ensuring that the node can build an accurate copy of the UTXO set for the block chain with the most proof of work. Segwit enables this capability at the consensus layer, but note that Groestlcoin Core does not provide an option to use this capability as of this 2.13.3 release.
8. Script versioning
Segwit makes it easy for future soft forks to allow Groestlcoin users to individually opt-in to almost any change in the Groestlcoin Script language when those users receive new transactions. Features currently being researched by Bitcoin Core contributors that may use this capability include support for Schnorr signatures, which can improve the privacy and efficiency of multisig transactions (or transactions with multiple inputs), and Merklized Abstract Syntax Trees (MAST), which can improve the privacy and efficiency of scripts with two or more conditions. Other Bitcoin community members are studying several other improvements that can be made using script versioning.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you view your transaction on a third party blockexplorer (restart the client after entering the url of the blockexplorer) ?
4. Can you use the wallet with TOR?
5. Are you able to backup your wallet (wallet.dat) file?
6. Are you able to encrypt your wallet (wallet.dat) file?
7. Are you able to use watch-only function?
8. How long does it take to fully synchronize?
9. Are you able to sign/verify messages?
10. Are you able to see you send/receive addresses?
11. Are you able to use the wallet in your local language?

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

Important:
• There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.
• Encrypt your wallet. This can be done by clicking the settings menu from inside the wallet. Make sure your password is secure and do not forget it.
• Make a copy your wallet.dat file as a backup and move it to a secure location:
Location Windows: Navigate to C:\Users\Username\AppData\Roaming\groestlcoin\wallet.dat (or open windows explorer and enter %appdata%\Groestlcoin\wallet.dat)
Location Mac: Finder -> Go {Hold Option] -> Library -> groestlcoin -> wallet.dat (~/Library/Application Support/groestlcoin/wallet.dat)

WARNING:
While this branch has been extensively tested to be compatible with the existing Groestlcoin v2.11.0 network there is the possibility that we missed something. ALWAYS BACKUP YOUR GROESTLCOIN WALLET BEFORE UPGRADING.

How to Upgrade?
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.
Mac: 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 Wallet (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.13.3/groestlcoin_x64.msi
Download the Windows Wallet (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.13.3/groestlcoin_x86.msi
Download the MAC Wallet here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.13.3/Groestlcoin-Qt.dmg

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

Groestlcoin Samourai is a wallet for the streets. A modern Groestlcoin wallet handforged to keep your transactions private, your identity masked, and your funds secure. Its main advantages are extremely portable and highly secure mobile Groestlcoin HD wallet.

We builded a wallet that Groestlcoin deserves. If you are looking for a wallet that Silicon Valley will never build, the regulators will never allow, and the VC's will never invest in. This is the right wallet for you!

Features
• Open source and unlicensed.
• Refresh button - Query instant the Groestlcoin Network.
• Military Grade Encryption - Groestlcoin Samourai is encrypted on the phone using AES-256 encryption.
• Strong Default Protection with BIP 44 and BIP 39 - Groestlcoin Samourai enforces a BIP 39 passphrase on wallet creation, hardening the security of your wallet right out of the gate.
• Secure PIN Login - Use a 5-8 digit PIN to access your wallet. PIN screen is randomized on every load to thwart screen recording spyware.
• You control your private keys - Private keys are created and stored on your device and are never communicated with any server or anyone.
• Certificate Pinning - Protects HTTPS websites from impersonation using fraudulent certificates issued by compromised certificate authorities.
• No address reuse - Groestlcoin Samourai never reuses addresses, never leaking valuable metadata about you and your purchase habits.
• Randomized change outputs - Groestlcoin Samourai is the only wallet to randomize the number of change outputs for each send, making gathering wallet address metadata more difficult.
• Deterministic inputs/outputs positioning - Groestlcoin Samourai positions the inputs/outputs of each transaction deterministically after a send, decreasing the effectiveness of block chain snooping.
• Avoid linking previous change outputs - Groestlcoin Samourai parses all previous transactions before building a new transaction to make sure it isn't leaking valuable metadata about your and your wallet.
• Tor and VPN Support - Groestlcoin Samourai is enabled with Tor and VPN support allowing you the ability to route all transactions through an anonymous IP address.
• Send in your favorite currency - Instant currency conversion makes it easier to send Groestlcoin. Local currency exchange rates provided by Cryptopia and Bittrex.
• Smart Miner Fees - Groestlcoin Samourai offers three different miner fee profiles: Auto to use our smart fee detection algorithm, Priority during times of network stress to ensure quick confirmations, Custom to set a fee of your own choice.
• Block Chain Obfuscation - Groestlcoin Samourai offers three different presets that provide varying levels of obfuscations: Simple to send a basic HD transaction with no added obfuscation, Groestlcoin Samourai Send to send a transaction that uses decoy change addresses,  CoinJoin Simulation to send a transaction that is indistinguishable from a CoinJoin transaction on the block chain.
• Export your wallet anywhere, anytime - You may export your wallet to any Groestlcoin wallet than follows BIP 39,44 specifications.
• Restore any HD wallet - You may restore an existing HD wallet from any wallet provider with or without a BIP 39 passphrase
• Choose your favorite groestlcoin unit - GRS, mGRS, µGRS, It is up to you.
• Choose your favorite Block Explorer - Most popular block explorers are available to view transactions on the web.
• Transactional Privacy - Groestlcoin Samourai has formulated multiple algorithms that help preserve your transactional privacy.
• Block Chain Privacy - Basic transaction obscuring on block chain with change address manipulation. Groestlcoin Samourai anonymization feature uses tricks with inputs and outputs of your own wallet that create transactions on the blockchain designed to confuse outsiders.
• Advanced Sending - Groestlcoin Samourai gives you fine grained control over privacy and miners fees with every send.
• BIP 47 "Reusable Payment Codes" support - The first full BIP 47 implementation, bringing privacy to public payment addresses. Payment channels are a brand new way to privately send and receive Groestlcoin without sharing addresses or losing privacy.
• Remote SMS Commands - The first Groestlcoin wallet to hide itself and offer a remote self destruct button.
• Stealth Mode - Operate silently on the device.

How to use Reusable Payment Codes
Scan a payment code to open a payment channel - A payment channel will be created between both wallets by sending a special transaction on the blockchain. This is called a broadcast transaction and requires 1 network confirmation to confirm.
Tap to send - Once the broadcast transaction is confirmed the payment channel is open. Simply tap the channel name to send Groestlcoin directly to that wallet. No need to know their address.
Your wallet now has a Reusable Payment Code that you can share - Your payment code is unique to the wallet and never changes. You can publish and share your payment code without a loss of privacy for you or the sender.
No address needed - When your payment code is added by another wallet you will be able to receive Groestlcoin without ever sharing a Groestlcoin address. You can optionally send Groestlcoin back to the other wallet without sharing addresses.

Stealth Mode & Remote Commands
To remotely retrieve your wallet seed for backup/restore. Send an SMS to your phone with the following message: SW seed YOUR_PIN_CODE
You will receive the HEX seed of your wallet in response which you can use to restore access to your Groestlcoin.
To remotely wipe your wallet send an SMS to your phone with the following message: SW wipe YOUR_PIN_CODE
You will receive confirmation that the wallet has been securely wiped from the device.
If your phone is stolen and the thief has switched the SIM Card you can still initiate remote commands. With Sim Switch Defence enabled Groestlcoin Samourai will send your registered trusted number an SMS as soon as the SIM card is changed on your stolen phone. You can now send a remote wipe command to the new number.
While in Stealth Mode Groestlcoin Samourai will not appear on your phone home screen, app list, launcher, or recent apps. To open your wallet once it is in Stealth Mode you must dial a special code: **YOUR_PIN_CODE#
If the code has been entered correctly Samourai Wallet will launch.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from another phone.
4. Can you request coins via email or other android service?
5. How long does it take to query the blockchain?
6. Does it calculate exchange rates properly?
7. Does the Refresh button work?
8. Can you use the wallet through VPN?
9. Can you use the wallet through TOR?
10. Is the stealth mode working properly?
11. Is the remote self destruct working properly?
12. Can you receive coins over a payment channel? (small amounts to avoid losing them)
13. can you send coins over a payment channel?
14. Is the Groestlcoin samourai send working properly?
15. Is the Coinjoin Simluation send working properly?
16. Are you able to chose from multiple blockexplorers?
17. Are you able to export and import your wallet?
18. Is the scramble pin option working?

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.
Important note: Wallet only queries the network when really needed, use the refresh button to query instantly.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

Groestlcoin Samourai is available in the Blackberry World:
https://appworld.blackberry.com/webstore/content/59999901/

Source code:
https://github.com/Groestlcoin/groestlcoin-samourai-wallet-android - The Groestlcoin Samourai Source code

Groestlcoin Samourai is a wallet for the streets. A modern Groestlcoin wallet handforged to keep your transactions private, your identity masked, and your funds secure. Its main advantages are extremely portable and highly secure mobile Groestlcoin HD wallet.

We builded a wallet that Groestlcoin deserves. If you are looking for a wallet that Silicon Valley will never build, the regulators will never allow, and the VC's will never invest in. This is the right wallet for you!

Features
• Open source and unlicensed.
• Refresh button - Query instant the Groestlcoin Network.
• Military Grade Encryption - Groestlcoin Samourai is encrypted on the phone using AES-256 encryption.
• Strong Default Protection with BIP 44 and BIP 39 - Groestlcoin Samourai enforces a BIP 39 passphrase on wallet creation, hardening the security of your wallet right out of the gate.
• Secure PIN Login - Use a 5-8 digit PIN to access your wallet. PIN screen is randomized on every load to thwart screen recording spyware.
• You control your private keys - Private keys are created and stored on your device and are never communicated with any server or anyone.
• Certificate Pinning - Protects HTTPS websites from impersonation using fraudulent certificates issued by compromised certificate authorities.
• No address reuse - Groestlcoin Samourai never reuses addresses, never leaking valuable metadata about you and your purchase habits.
• Randomized change outputs - Groestlcoin Samourai is the only wallet to randomize the number of change outputs for each send, making gathering wallet address metadata more difficult.
• Deterministic inputs/outputs positioning - Groestlcoin Samourai positions the inputs/outputs of each transaction deterministically after a send, decreasing the effectiveness of block chain snooping.
• Avoid linking previous change outputs - Groestlcoin Samourai parses all previous transactions before building a new transaction to make sure it isn't leaking valuable metadata about your and your wallet.
• Tor and VPN Support - Groestlcoin Samourai is enabled with Tor and VPN support allowing you the ability to route all transactions through an anonymous IP address.
• Send in your favorite currency - Instant currency conversion makes it easier to send Groestlcoin. Local currency exchange rates provided by Cryptopia and Bittrex.
• Smart Miner Fees - Groestlcoin Samourai offers three different miner fee profiles: Auto to use our smart fee detection algorithm, Priority during times of network stress to ensure quick confirmations, Custom to set a fee of your own choice.
• Block Chain Obfuscation - Groestlcoin Samourai offers three different presets that provide varying levels of obfuscations: Simple to send a basic HD transaction with no added obfuscation, Groestlcoin Samourai Send to send a transaction that uses decoy change addresses,  CoinJoin Simulation to send a transaction that is indistinguishable from a CoinJoin transaction on the block chain.
• Export your wallet anywhere, anytime - You may export your wallet to any Groestlcoin wallet than follows BIP 39,44 specifications.
• Restore any HD wallet - You may restore an existing HD wallet from any wallet provider with or without a BIP 39 passphrase
• Choose your favorite groestlcoin unit - GRS, mGRS, µGRS, It is up to you.
• Choose your favorite Block Explorer - Most popular block explorers are available to view transactions on the web.
• Transactional Privacy - Groestlcoin Samourai has formulated multiple algorithms that help preserve your transactional privacy.
• Block Chain Privacy - Basic transaction obscuring on block chain with change address manipulation. Groestlcoin Samourai anonymization feature uses tricks with inputs and outputs of your own wallet that create transactions on the blockchain designed to confuse outsiders.
• Advanced Sending - Groestlcoin Samourai gives you fine grained control over privacy and miners fees with every send.
• BIP 47 "Reusable Payment Codes" support - The first full BIP 47 implementation, bringing privacy to public payment addresses. Payment channels are a brand new way to privately send and receive Groestlcoin without sharing addresses or losing privacy.
• Remote SMS Commands - The first Groestlcoin wallet to hide itself and offer a remote self destruct button.
• Stealth Mode - Operate silently on the device.

How to use Reusable Payment Codes
Scan a payment code to open a payment channel - A payment channel will be created between both wallets by sending a special transaction on the blockchain. This is called a broadcast transaction and requires 1 network confirmation to confirm.
Tap to send - Once the broadcast transaction is confirmed the payment channel is open. Simply tap the channel name to send Groestlcoin directly to that wallet. No need to know their address.
Your wallet now has a Reusable Payment Code that you can share - Your payment code is unique to the wallet and never changes. You can publish and share your payment code without a loss of privacy for you or the sender.
No address needed - When your payment code is added by another wallet you will be able to receive Groestlcoin without ever sharing a Groestlcoin address. You can optionally send Groestlcoin back to the other wallet without sharing addresses.

Stealth Mode & Remote Commands
To remotely retrieve your wallet seed for backup/restore. Send an SMS to your phone with the following message: SW seed YOUR_PIN_CODE
You will receive the HEX seed of your wallet in response which you can use to restore access to your Groestlcoin.
To remotely wipe your wallet send an SMS to your phone with the following message: SW wipe YOUR_PIN_CODE
You will receive confirmation that the wallet has been securely wiped from the device.
If your phone is stolen and the thief has switched the SIM Card you can still initiate remote commands. With Sim Switch Defence enabled Groestlcoin Samourai will send your registered trusted number an SMS as soon as the SIM card is changed on your stolen phone. You can now send a remote wipe command to the new number.
While in Stealth Mode Groestlcoin Samourai will not appear on your phone home screen, app list, launcher, or recent apps. To open your wallet once it is in Stealth Mode you must dial a special code: **YOUR_PIN_CODE#
If the code has been entered correctly Samourai Wallet will launch.

It is appreciated if feedback of the following is provided:
1. Can you receive coins? (small amounts to avoid losing them)
2. Can you send coins?
3. Can you scan a QR code from another phone.
4. Can you request coins via email or other android service?
5. How long does it take to query the blockchain?
6. Does it calculate exchange rates properly?
7. Does the Refresh button work?
8. Can you use the wallet through VPN?
9. Can you use the wallet through TOR?
10. Is the stealth mode working properly?
11. Is the remote self destruct working properly?
12. Can you receive coins over a payment channel? (small amounts to avoid losing them)
13. can you send coins over a payment channel?
14. Is the Groestlcoin samourai send working properly?
15. Is the Coinjoin Simluation send working properly?
16. Are you able to chose from multiple blockexplorers?
17. Are you able to export and import your wallet?
18. Is the scramble pin option working?

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.
Important note: Wallet only queries the network when really needed, use the refresh button to query instantly.

The application may have unfound bugs and problems. To leave feedback: 
1.  PM hashengineering on bitcointalk: https://bitcointalk.org/index.php?action=profile;u=155038
2.  Email: [email protected]
3.  Reports of errors can also be posted in this topic.

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

Source code:
https://github.com/Groestlcoin/groestlcoin-samourai-wallet-android - The Groestlcoin Samourai Source code