Topics

GRS BlueWallet is a thin client for Groestlcoin.

GRS BlueWallet is built with React Native and Electrum-GRS.

Changelog 6.1.9
• ADD: camera on main screen
• ADD: Shortcuts on Scan button long press
• FIX: Set the first launch flag (issue with disappearing wallets)
• ADD: Catalan translation
• ADD: Slovak translation
• ADD: custom success animation to onchain transactions
• ADD: fiat input for receive & send
• ADD: Fee details to lighting invoice
• ADD: Entropy via dice rolls and coin flip
• ADD: Exclude wallet transactions
• ADD: Detect language automatically
• ADD: Launch screen dark mode
• ADD: Dark Mode
• ADD: support importing watch-only in groestlcoincore format fingerprint/derivationxpub (wallet descriptors)
• ADD: Split for large devices
• ADD: Export file option
• ADD: Slovenian & Hebrew language
• ADD: KES, NGN, TWD Fiat
• ADD: Import LNDHub from QR
• ADD: Electrum server import from QR
• ADD: Privacy Settings Screen
• ADD: Clipboard read opt-out
• ADD: Support lnurl fallback scheme
• ADD: Philippines Peso currency
• ADD: Market Widget for iOS 14
• ADD: Large iOS widget
• ADD: Turkish Lira
• ADD: Price Current/Previous Widget
• ADD: Allow image for importing wallet
• ADD: ARS fiat currency
• ADD: Coin Control
• ADD: new languages: Bulgarian, Polish, Welsh
• ADD: UYU currency
• ADD: Multisig Vaults
• ADD: Create Multisig Vaults
• ADD: Import Multisig Vaults
• ADD: Vaults Backup
• ADD: Coordination Backup
• ADD: Manage/edit Keys
• ADD: Share co-signers
• ADD: Quorum setup
• ADD: Choose address type
• ADD: Persian language
• ADD: Help section and tips to Vaults
• ADD: enable batch-send on multisig wallets
• ADD: Easily share a Vault key with QR code
• ADD: How many signatures can this Vault make
• ADD: Electrum servers history - fast connect
• ADD: Ability to set servers via QR code scanning
• ADD: CoinControl multi-selection
• ADD: iOS 14.5 support
• ADD: Electrum-grs json import support
• ADD: Offline Signing and Cold Storage
• ADD: Encrypted Message sign/verify
• ADD: Allow send MAX and BATCH for all wallet types
• ADD: TZS currency
• ADD: ANG and AWG currencies
• ADD: Tor support
• ADD: Hierarchy Navigator (List of addresses)
• ADD: Slip39 wallets (Shamir's Secret Sharing)
• ADD: PSBT for all HD watch-only wallets

Features
• Multi-currency- GRS Bluewallet supports more than 20 currencies, including USD, AUD, BRL, CAD, CHF, CZK, CNY, EUR, GDP, HRK, INR, JPY, MXN, MYR, or RUB.
• Multi-language - GRS Bluewallet supports more than 20 languages, including Chinese, Japanese, Portuguese, Spanish, Indonesian, Russian, Ukranian, Italian, German, Swedish, Norwegian, French, Danish or Turkish.
• Export TXHEX - You can get your transaction HEX (TXHEX) without broadcasting it, and only do it with the relay of your choice.
• Be in control - On your Groestlcoin wallet your private keys never leave your device. You are in full control of your private keys. You can at any moment generate backups and export/import your wallets, with full control of what to do with your private keys.
• Multiple wallets support - GRS Bluewallet aims to support the maximum wallet standards. Currently supported: BIP44 (HD), BIP49 (HD SegWit), BIP84 (HD bech32, native SegWit), BIP39 Groestlwallet-compatible (m/0'/0/0), Legacy single-address, SegWit single-address (P2SH). You can have many wallets in a single app at the same time.
• HD wallets - The Hierarchical Deterministic (HD) key creation and transfer protocol (BIP32), which allows creating child keys from parent keys in a hierarchy. The HD Wallets will generate you different public keys for each transactions.
• SegWit - SegWit supported in P2SH-compatibility mode and bech32 Native mode. Segwit was a massive upgrade to the Groestlcoin Protocol released in 2017. You will find all wallets with SegWit enabled by default.
• Full encryption - On top of the phone multi-layer encryption, GRS Bluewallet can encrypt everything with an added password. Biometric security (touch ID, Face ID) is not safe, so you will have an additional password to encrypt your wallet instead.
• Plausible deniability - A custom made feature thinking about your personal security. GRS Bluewallet allows you to define a different password which will decrypt a fake wallet set up. For any situation you are forced to disclose your access or when you don't want or you can't show your real wallet.
• Open Source - GRS Bluewallet is built on a public repo, up-to-date and available on the Groestlcoin GitHub. This means that any user can build it and run it on his own, without any custodial dependencies. Verify the code and contribute to the wallet development. GRS BlueWallet is made with ReactNative and Distributed under a MIT licensed.
• Watch-only wallets - Watch-only wallets allows you to keep an eye on your cold storage without touching your private key. Easily import your address or xpub and watch it from your app without ever touching it.
• Lightning Wallets - Wallets with support for the Lightning Network Protocol. Unfairly cheap and fast transactions. You can send, receive and refill your wallets.
• Bump and Cancel transactions - Ability to bump and cancel sent transactions with "Replace-by-fee" (RBF) and ability to Bump received transactions with "Child-pays-for-parent" (CPFP) on Native Segwit wallets (bech32/BIP84).
• Plug-in your Groestlcoin Full node new - Ability to plug-in your own Groestlcoin Full node through Electrum Personal Server (EPS), ElectrumX or Electrs. Don't trust, verify for a maximum sovereignty.

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

GRS BlueWallet is available in the App store:
https://apps.apple.com/us/app/grs-bluewallet/id1518766083

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

Groestlcoin Spark Lightning Wallet Android: A minimalistic wallet GUI for c-lightning through Android

Groestlcoin Spark is currently oriented for technically advanced users and is not an all-in-one package, but rather a "remote control" interface for a c-lightning node that has to be managed separately.
Groestlcoin Sparks supports sending and receiving payments, viewing history, and managing channels.
Groestlcoin Spark is a purely off-chain wallet, with no on-chain payments. This allows Groestlcoin Spark to fully realize the awesome UX enabled by lightning.
Groestlcoin Spark has a responsive UI suitable for mobile, tablet and desktop devices, but is best optimized for use on mobile

Changelog 0.3.1:
• BOLT12: Send payments using BOLT12 offers (including support for any amounts, quantities, fiat denomination and sending a payer_note to the payee). Requires c-lightning v0.10.1+ with experimental-offers enabled.
• BOLT12: Create reusable BOLT12 offers to receive multiple payments (basic support only). Requires c-lightning v0.10.1+ with experimental-offers enabled.
• BOLT12: Pull payments using BOLT12 withdrawal offers (send_invoice=true). Requires c-lightning v0.10.1+ with experimental-offers enabled.
• UI: Non-blocking payments with paystatus tracking
• Payments are now sent in the background without blocking the UI, with pending/failed payments shown in the homepage payment history.
• UI: Improve the main screen initial loading times
• Pay/Request can now be used immediately, without waiting for the wallet's data to load first.
• UI: Always display payment amounts in USD terms too
• UI: Improved error reporting and display
• Update clightning-client to v0.1.4
• Use newaddr all to avoid creating new addresses when switching types
• This raises the minimally supported c-lightning version to v0.7.1.
• Reproducibility: Due to changes in third-party dependencies, the Android apk build and the Windows portable runner are no longer reproducible, while the Linux AppImage now is.
• Cordova: Target Android SDK version 30

Features:
• Pay and Request are pretty intuitive and don't require much explaining. Try them!
• Display unit: Click the balance on the top-right or the unit in the "request payment" page to toggle the currency display unit. The available options are gro, groestls, milli, grs and usd.
• Theme switcher: Click the theme name on the bottom-right to change themes (you can choose between 16 bootswatch themes).
• Payment details: Click on payments in the list to display more details. (note that the fee shown includes c-lightning's overpayment randomization)
• Expert mode: Click the version number on the bottom-left to toggle expert mode. This will add two new menu items, "Logs" and "RPC Console", and display yaml dumps with additional information throughout the app.
• Node address: Click the node id on the footer to open the node info page which displays your node address (as text and QR).
• Channel management: Click the "Channels" button inside the node info page to show and manage channels.

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.

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

Source code: https://github.com/Groestlcoin/groestlcoin-spark/

Groestlcoin Spark Lightning Wallet: A minimalistic wallet GUI for c-lightning through desktop apps.

Groestlcoin Spark is currently oriented for technically advanced users and is not an all-in-one package, but rather a "remote control" interface for a c-lightning node that has to be managed separately.
Groestlcoin Sparks supports sending and receiving payments, viewing history, and managing channels.
Groestlcoin Spark is a purely off-chain wallet, with no on-chain payments. This allows Groestlcoin Spark to fully realize the awesome UX enabled by lightning.

Changelog 0.3.1:
• BOLT12: Send payments using BOLT12 offers (including support for any amounts, quantities, fiat denomination and sending a payer_note to the payee). Requires c-lightning v0.10.1+ with experimental-offers enabled.
• BOLT12: Create reusable BOLT12 offers to receive multiple payments (basic support only). Requires c-lightning v0.10.1+ with experimental-offers enabled.
• BOLT12: Pull payments using BOLT12 withdrawal offers (send_invoice=true). Requires c-lightning v0.10.1+ with experimental-offers enabled.
• UI: Non-blocking payments with paystatus tracking
• Payments are now sent in the background without blocking the UI, with pending/failed payments shown in the homepage payment history.
• UI: Improve the main screen initial loading times
• Pay/Request can now be used immediately, without waiting for the wallet's data to load first.
• UI: Always display payment amounts in USD terms too
• UI: Improved error reporting and display
• Fix: Properly display the NoScript message on Firefox
• Update clightning-client to v0.1.4
• Use newaddr all to avoid creating new addresses when switching types
• This raises the minimally supported c-lightning version to v0.7.1.
• Reproducibility: Due to changes in third-party dependencies, the Android apk build and the Windows portable runner are no longer reproducible, while the Linux AppImage now is.

Features:
• Pay and Request are pretty intuitive and don't require much explaining. Try them!
• Display unit: Click the balance on the top-right or the unit in the "request payment" page to toggle the currency display unit. The available options are gro, groestls, milli, grs and usd.
• Theme switcher: Click the theme name on the bottom-right to change themes (you can choose between 16 bootswatch themes).
• Payment details: Click on payments in the list to display more details. (note that the fee shown includes c-lightning's overpayment randomization)
• Expert mode: Click the version number on the bottom-left to toggle expert mode. This will add two new menu items, "Logs" and "RPC Console", and display yaml dumps with additional information throughout the app.
• Node address: Click the node id on the footer to open the node info page which displays your node address (as text and QR).
• Channel management: Click the "Channels" button inside the node info page to show and manage channels.

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.

Download the OSX wallet here: https://github.com/Groestlcoin/groestlcoin-spark/releases/download/v0.3.1/groestlcoin-spark-0.3.1-mac-x64.zip

Download Windows installer here: https://github.com/Groestlcoin/groestlcoin-spark/releases/download/v0.3.1/groestlcoin-spark-0.3.1-win-setup.exe
Download Windows portable version here: https://github.com/Groestlcoin/groestlcoin-spark/releases/download/v0.3.1/groestlcoin-spark-0.3.1-win-portable.exe
                                       
Download Linux Appimage installer here: https://github.com/Groestlcoin/groestlcoin-spark/releases/download/v0.3.1/groestlcoin-spark-0.3.1-linux-x86_64.AppImage
Download Linux Snap installer here: https://github.com/Groestlcoin/groestlcoin-spark/releases/download/v0.3.1/groestlcoin-spark-0.3.1-linux-amd64.snap
Download Linux Deb installer here: https://github.com/Groestlcoin/groestlcoin-spark/releases/download/v0.3.1/groestlcoin-spark-0.3.1-linux-amd64.deb

Source code: https://github.com/Groestlcoin/groestlcoin-spark/

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

https://www.youtube.com/watch?v=qNMTDEPhWhY

Changelog v1.3.6.0
• Taproot support
• Specify default payment method through UI and Greenfield API
• Disallow cancelling payment request when "Allow payee to create invoices in their own denomination" is not enabled
• Support custom currencies for Pay button generator
• Show total balance on wallets list
• Add ability to set invoice status from details page
• Add ability to accept tips in POS terminal
• Add ability to wipe all the transactions of a wallet for admins
• Allow User to delete own account
• Allow email notifications when creating invoices from Web UI
• Greenfield: Provide negative undue when overpaid.
• Support topup invoices in apps
• Support Lightning in Pull Payments.
• Support LNURL and Lightning address in Pull Payments
• Add boolean overPaid to the invoice settled webhook
• Ability to display and update the appname in crowdfund and PoS
• Add ability to require refund email from app level
• Azerbaijan support for the checkout
• Upgrade to Bootstrap 5.1.3

Features
• Direct, P2P Groestlcoin Testnet payments
• Lightning Network Testnet support
• 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 our host. The self-hosted solution allows you not only to attach an unlimited number of stores but also become the payment processor for others.
• Open Source - MIT license

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.

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

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

https://www.youtube.com/watch?v=qNMTDEPhWhY

Changelog v1.3.6.0
• Taproot support
• Specify default payment method through UI and Greenfield API
• Disallow cancelling payment request when "Allow payee to create invoices in their own denomination" is not enabled
• Support custom currencies for Pay button generator
• Show total balance on wallets list
• Add ability to set invoice status from details page
• Add ability to accept tips in POS terminal
• Add ability to wipe all the transactions of a wallet for admins
• Allow User to delete own account
• Allow email notifications when creating invoices from Web UI
• Greenfield: Provide negative undue when overpaid.
• Support topup invoices in apps
• Support Lightning in Pull Payments.
• Support LNURL and Lightning address in Pull Payments
• Add boolean overPaid to the invoice settled webhook
• Ability to display and update the appname in crowdfund and PoS
• Add ability to require refund email from app level
• Azerbaijan support for the checkout
• Upgrade to Bootstrap 5.1.3

Features
• Direct, P2P Groestlcoin payments
• Lightning Network support
• Complete control over private keys
• Enchanced privacy
• SegWit support
• Process payments for others
• Easy-embeddable Payment buttons
• Point of sale app
• 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 our host. The self-hosted solution allows you not only to attach an unlimited number of stores but also become the payment processor for others.
• Open Source - MIT license

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.

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

C-lightning: A specification compliant Lightning Network implementation in C

C-lightning is a lightweight, highly customizable and standard compliant implementation of the Lightning Network protocol.
C-lightning only works on Linux and Mac OS, and requires a locally (or remotely) running groestlcoind (version 2.16.0 or above) that is fully caught up with the network you're testing on.

Changelog 0.10.2
• Payments can now be retried without affecting the status of prior attempts.
• The route selection will now use the log-propability-based channel selection to increase success rate and reduce time to completion.
• close now reports the feeranges each side enforced, which allows users to determine which side caused a high or low feerate.
• Removal of old HTLC information and vacuuming shrinks large lightningd.sqlite3 by a factor of 2-3.
• setchannelfee now has a grace period during which both old and new fee policies are considered. This prevents a fee update from making the channel unusable until the update propagated.
• We now perform quick-close if the peer supports it.
• We send regular pings to detect dead connections (particularly for Tor).
• Errors returning a channel_update no longer return an outdated one.
• Anchor output mutual close allow a fee higher than the final commitment transaction.
• Plugins now are notified about an upcoming shutdown, allowing them to store data and clean up before exiting.
• The datastore API (datastore, deldatastore, and listdatastore) exposes a simple key-value store, allowing plugin authors to store data in the c-lightning database.
• ping now only works if we have a channel with the peer.
• Relaxed the sqlite3 version match requirements to be at least a minimum version and a major version match

Features
• Creating channels.
• Closing channels.
• Completely managing all channel states (including the exceptional ones!).
• Performing path finding within the network, passively forwarding incoming payments.
• Sending outgoing onion-encrypted payments through the network.
• Automatic channel management (autopilot).

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.

Linux: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-ubuntu
OSX: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-macos

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

[The following were tested in Debian 11]

The following were tested in Debian 11, some dependencies can be different in other distros

• apt-get update -y && apt-get upgrade -y && apt-get dist-upgrade -y
• dd if=/dev/zero of=/swapfile bs=1M count=4096
• mkswap /swapfile
• swapon /swapfile
• echo "/swapfile swap swap defaults 0 0" >> /etc/fstab
• apt-get install build-essential libssl-dev libboost-all-dev libdb5.3 libdb5.3-dev libdb5.3++-dev libtool automake libevent-dev bsdmainutils -y
• apt-get install git ntp make g++ gcc autoconf cpp ngrep iftop sysstat autotools-dev pkg-config libminiupnpc-dev libzmq3-dev -y
• apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common git screen -y
• curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
• add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
• apt-get update
• apt-get install docker-ce -y
• git clone https://github.com/trezor/blockbook
• cd blockbook
• make deb-backend-groestlcoin_signet deb-blockbook-groestlcoin_signet
• cd build
• apt install ./blockbook-g*deb ./backend-g*deb -y
• systemctl start backend-groestlcoin-signet
• cd /opt/coins/data/groestlcoin_signet/backend/signet
• wait till deamon is synced (check with: tail debug.log)
• systemctl restart backend-groestlcoin-signet
• systemctl enable backend-groestlcoin-signet
• systemctl start blockbook-groestlcoin-signet
• cd /opt/coins/blockbook/groestlcoin_signet/logs/
• wait till blockbook is synced (check with: tail blockbook.INFO)
• systemctl enable blockbook-groestlcoin-signet
• sudo apt-get install certbot
• certbot certonly --standalone -d blockbook-signet.groestlcoin.org
• crontab -e
• Add end of file:
  14 3 * * * /usr/sbin/service nginx stop
  15 3 * * * /usr/bin/certbot renew --quiet
  16 3 * * * /usr/sbin/service nginx start
• Crtl+o enter, ctrl X
• systemctl restart blockbook-groestlcoin-signet
• apt-get install nginx
• nano /etc/nginx/sites-available/default
• delete all and paste:
  server {
      listen 80;
      listen 443 ssl;
      ssl_certificate /etc/letsencrypt/live/blockbook-signet.groestlcoin.org/fullchain.pem;
      ssl_certificate_key /etc/letsencrypt/live/blockbook-signet.groestlcoin.org/privkey.pem;
  
      server_name blockbook-signet.groestlcoin.org;
  
      # force https-redirects
      if ($scheme = http) {
          return 301 https://blockbook-signet.groestlcoin.org$request_uri;
      }
  
      location / {
          add_header Access-Control-Allow-Origin '*' always;
          proxy_pass https://localhost:19147;
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-NginX-Proxy true;
  
          # Enables WS support
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection "upgrade";
          proxy_redirect off;
      }
  }
• systemctl reload nginx

[The following were tested in Ubuntu 14.04 and Ubuntu 16.04]

The following were tested in Ubuntu 14.04 and Ubuntu 16.04, some dependencies can be different in other distros.

• aptitude update -y && aptitude upgrade -y && apt-get update -y && apt-get upgrade -y && apt-get dist-upgrade -y
• dd if=/dev/zero of=/swapfile bs=1M count=4096
• mkswap /swapfile
• swapon /swapfile
• echo "/swapfile swap swap defaults 0 0" >> /etc/fstab
• sudo apt-get install build-essential libssl-dev libboost-all-dev libdb5.3 libdb5.3-dev libdb5.3++-dev libtool automake libevent-dev bsdmainutils -y
• sudo apt-get install git ntp make g++ gcc autoconf cpp ngrep iftop sysstat autotools-dev pkg-config libminiupnpc-dev libzmq3-dev -y
• sudo apt-get install libgmp-dev libsqlite3-dev python python3 net-tools zlib1g-dev gettext jq -y
• curl -sL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
• sudo apt-get install nodejs -y
• npm install --global yarn
• git clone https://github.com/Groestlcoin/audio2bip39
• cd audio2bip
• screen
• nano webpack.config.dev.js
• Add under devServer:
  disableHostCheck: true,
• npm install --force
• npm start
• ctrl+d and ctrl+a
• cd ..
• sudo apt-get install software-properties-common
• sudo add-apt-repository ppa:certbot/certbot
• sudo apt-get update
• sudo apt-get install certbot python-certbot-nginx -y
• certbot --nginx -d audio2bip39.groestlcoin.org
• crontab -e
• Add end of file:
  15 3 * * * /usr/bin/certbot renew --quiet
• Crtl+o enter, ctrl X
• apt-get install nginx
• nano /etc/nginx/sites-available/default
• delete all and paste:
  server {
      listen 80;
      listen 443 ssl;
      ssl_certificate /etc/letsencrypt/live/audio2bip39.groestlcoin.org/fullchain.pem;
      ssl_certificate_key /etc/letsencrypt/live/audio2bip39.groestlcoin.org/privkey.pem;
     
      server_name audio2bip39.groestlcoin.org;
  
      # force https-redirects
      if ($scheme = http) {
          return 301 https://audio2bip39.groestlcoin.org$request_uri;
      }
  
      location / {
          proxy_pass http://localhost:8080;
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-NginX-Proxy true;
  
          # Enables WS support
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection "upgrade";
          proxy_redirect off;
      }
  }
• Crtl+o enter, ctrl X
• service nginx restart

[The following were tested in Ubuntu 14.04 and Ubuntu 16.04]

The following were tested in Ubuntu 14.04 and Ubuntu 16.04, some dependencies can be different in other distros.

• aptitude update -y && aptitude upgrade -y && apt-get update -y && apt-get upgrade -y && apt-get dist-upgrade -y
• dd if=/dev/zero of=/swapfile bs=1M count=4096
• mkswap /swapfile
• swapon /swapfile
• echo "/swapfile swap swap defaults 0 0" >> /etc/fstab
• sudo apt-get install build-essential libssl-dev libboost-all-dev libdb5.3 libdb5.3-dev libdb5.3++-dev libtool automake libevent-dev bsdmainutils -y
• sudo apt-get install git ntp make g++ gcc autoconf cpp ngrep iftop sysstat autotools-dev pkg-config libminiupnpc-dev libzmq3-dev -y
• sudo apt-get install libgmp-dev libsqlite3-dev python python3 net-tools zlib1g-dev gettext jq -y
• git clone https://github.com/groestlcoin/groestlcoin
• cd groestlcoin
• ./autogen.sh
• ./configure
• make
• strip src/groestlcoind src/groestlcoin-cli src/groestlcoin-tx src/groestlcoin-wallet src/groestlcoin-util
• sudo mv src/groestlcoind src/groestlcoin-cli src/groestlcoin-tx src/groestlcoin-wallet src/groestlcoin-util /usr/bin
• mkdir ~/.groestlcoin
• nano ~/.groestlcoin/groestlcoin.conf
• write:
  listen=1
  server=1
  maxconnections=863
  daemon=1
  txindex=1
  blockfilterindex=1
  coinstatsindex=1
  rpcuser=yourusernamehere
  rpcpassword=yourpasswordhere
• Crtl+o enter, ctrl X
• groestlcoind -signet
• Let it sync (can take up to 2 hours), verify with groestlcoin-cli -signet -getinfo
• curl -sL https://deb.nodesource.com/setup_16.x | sudo bash -
• sudo apt-get install nodejs -y
• git clone https://github.com/Groestlcoin/grs-rpc-explorer
• cd grs-rpc-explorer
• screen
• nano .env
• edit:
  BTCEXP_GROESTLCOIND_URI=http://yourusernamehere:[email protected]:31441?timeout=10000
  BTCEXP_GROESTLCOIND_HOST=127.0.0.1
  BTCEXP_GROESTLCOIND_PORT=31441
  BTCEXP_GROESTLCOIND_USER=yourusernamehere
  BTCEXP_GROESTLCOIND_PASS=yourpasswordhere
  #BTCEXP_ADDRESS_API=electrum
  #BTCEXP_ELECTRUMX_SERVERS=tls://127.0.0.1:51002
• npm install
• npm start
• ctrl+d and ctrl+a
• cd ..
• sudo apt-get install software-properties-common
• sudo add-apt-repository ppa:certbot/certbot
• sudo apt-get update
• sudo apt-get install certbot python-certbot-nginx -y
• certbot --nginx -d rpcexplorer-signet.groestlcoin.org
• crontab -e
• Add end of file:
  15 3 * * * /usr/bin/certbot renew --quiet
• Crtl+o enter, ctrl X
• apt-get install nginx
• nano /etc/nginx/sites-available/default
• delete all and paste:
  server {
      listen 80;
      listen 443 ssl;
      ssl_certificate /etc/letsencrypt/live/rpcexplorer-signet.groestlcoin.org/fullchain.pem;
      ssl_certificate_key /etc/letsencrypt/live/rpcexplorer-signet.groestlcoin.org/privkey.pem;
     
      server_name rpcexplorer-signet.groestlcoin.org;
  
      # force https-redirects
      if ($scheme = http) {
          return 301 https://rpcexplorer-signet.groestlcoin.org$request_uri;
      }
  
      location / {
          proxy_pass http://localhost:3002;
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-NginX-Proxy true;
  
          # Enables WS support
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection "upgrade";
          proxy_redirect off;
      }
  }
• Crtl+o enter, ctrl X
• service nginx restart

Groestlcoin VerifySignature: This implementation can accept get parameters, so it is linkable externally, and users could easily copy-paste one link to their counterparties to verify. This should be useful for people who do OTC and regularly do proof-of-funds before the transaction.

This tool makes it easier for users to verify signatures online/offline.

Features
• open source
• compiles into static html files so it can run completely offline

Live version available at https://verify.groestlcoin.org/VerifySignature  But it is recommended to download Groestlcoin VerifySignature offline and run it on your pc. Open index.html to get started.

Download Groestlcoin VerifySignature here: https://github.com/Groestlcoin/VerifySignature/archive/refs/heads/master.zip

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

A Hierarchical Deterministic Groestlcoin Testnet Wallet

The app allows you to send and receive testnet Groestlcoins on your Android device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself! This will save your wallet in a password protected file. Then your testnet coins can be retrieved even if you lose your phone.

Changelog 8.14
• Fix issue with not being able to send due to blockchain replay.
• Fix layout on 10in tablets.
• Customize the connectivity notification in trusted peer mode.
• Fix a build reproducibility issue.
• Update translations from Transifex.
• Improve offline payments via Bluetooth for Android 8.1 (Oreo) and up. Merchants should configure their own Bluetooth address in the settings.
• Restructure the settings page.
• Use CoinGecko.com for exchange rates.
• The color of the transaction confirmation indicator has been changed. It now starts red with one confirmation, slowly blending to green for 7 confirmations.
• On Android 9 and older, switched the app-widget back to dark. On Android 10, use the dark/light system setting.
• Get rid of the last internal content provider; replace it with a repository and an SQLite database.
• Minor bugfixes.
• Remove the ability to directly add an address to the address book from the clipboard due to safety concerns. The QR code scanner can still be used, and addresses you've already sent to can be added as well.
• Visual overhaul of the address book.
• Visual overhaul of the network monitor.
• Visual overhaul of the exchange rates list.
• Visual overhaul of the transactions list.
• Allow multiple trusted peers by separating them with a space character.
• The app now requires Android 6.0 (Marshmallow) or higher.
• On modern devices: Introduce a blockchain synchronization mode that prioritizes privacy vs data usage.
• Trusted peers with custom TCP ports are now supported. Use the IPv4:port or [IPv6]:port syntax.
• Based on groestlcoinj 0.15.10.

Features:
• Sweep testnet paper wallets
• Transparant - free and open source
• Testnet blockexplorer support
• Network monitor
• Backup/restore option
• Spending pin
• tpub support
• Ability to reset blockchain
• Ability to change denomination
• Ability to connect to trusted peer
• Connectivity indicator

If the app crashes you can send the report via email or another method if your phone allows it.  Reports of errors can also be posted in this topic.
To close the app, simply press the back button until you reach your home screen.  The app will close itself (there is no need for a disconnect option).
This application is licensed under the GPL version 3. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

Groestlcoin Testnet Wallet is available on Fdroid:
https://f-droid.org/en/packages/hashengineering.groestlcoin.wallet_test/

Source code:
https://github.com/Groestlcoin/groestlcoin-wallet

A Hierarchical Deterministic Groestlcoin Wallet

The app allows you to send and receive Groestlcoins on your device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself! This will save your wallet in a password protected file. Then your coins can be retrieved even if you lose your phone.

Changelog 8.14
• Fix issue with not being able to send due to blockchain replay.
• Fix layout on 10in tablets.
• Customize the connectivity notification in trusted peer mode.
• Fix a build reproducibility issue.
• Update translations from Transifex.
• Improve offline payments via Bluetooth for Android 8.1 (Oreo) and up. Merchants should configure their own Bluetooth address in the settings.
• Restructure the settings page.
• Use CoinGecko.com for exchange rates.
• The color of the transaction confirmation indicator has been changed. It now starts red with one confirmation, slowly blending to green for 7 confirmations.
• On Android 9 and older, switched the app-widget back to dark. On Android 10, use the dark/light system setting.
• Get rid of the last internal content provider; replace it with a repository and an SQLite database.
• Minor bugfixes.
• Remove the ability to directly add an address to the address book from the clipboard due to safety concerns. The QR code scanner can still be used, and addresses you've already sent to can be added as well.
• Visual overhaul of the address book.
• Visual overhaul of the network monitor.
• Visual overhaul of the exchange rates list.
• Visual overhaul of the transactions list.
• Allow multiple trusted peers by separating them with a space character.
• The app now requires Android 6.0 (Marshmallow) or higher.
• On modern devices: Introduce a blockchain synchronization mode that prioritizes privacy vs data usage.
• Trusted peers with custom TCP ports are now supported. Use the IPv4:port or [IPv6]:port syntax.
• Based on groestlcoinj 0.15.10.

Features:
• Sweep paper wallets
• Transparant - free and open source
• Blockexplorer support
• Network monitor
• Backup/restore option
• Spending pin
• xpub support
• Ability to reset blockchain
• Ability to change denomination
• Ability to connect to trusted peer
• Connectivity indicator

If the app crashes you can send the report via email or another method if your phone allows it.
To close the app, simply press the back button until you reach your home screen.  The app will close itself (there is no need for a disconnect option).
This application is licensed under the GPL version 3. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

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

Groestlcoin Wallet is available on Fdroid:
https://f-droid.org/en/packages/hashengineering.groestlcoin.wallet

Source code:
https://github.com/Groestlcoin/groestlcoin-wallet

GRS RPC Explorer Testnet: Simple, database-free Groestlcoin testnet blockchain explorer via RPC to Groestlcoin Core.

GRS RPC Explorer testnet is a simple, self-hosted explorer for the Groestlcoin testnet blockchain, driven by RPC calls to your own Groestlcoin testnet node. It is easy to run and can be connected to other tools (like ElectrumX) to achieve a full-featured explorer.
Whatever reasons one may have for running a full node (trustlessness, technical curiosity, supporting the network, etc) it's helpful to appreciate the "fullness" of your node. With this explorer, you can explore not just the blockchain database, but also explore the functional capabilities of your own node.

Changelog 3.2.0
• Public API! See the docs at /api/docs
• XPUB pages: search for any xpub (ypub, zpub, etc) and see summary details and a list of associated addresses
• Homepage: add "Predicted Next Block" section
• Mempool Summary: add top-fee transactions table
• Improvements to transaction details UI, especially on smaller screens
• Cleanup support for Taproot/bech32m
• New /mining-template tool, showing structured output of getblocktemplate command
• Various improvements to charts and graphs throughout the tool (including lots of y-axis changes: linear->log)
• Better support for BIP9 soft forks shown on /node-details (e.g. Taproot ST in 2.21.1)
• New "Recent" and "Favorites" sections on /rpc-browser
• Block lists: show (min, avg, max) fee rates instead of just avg
• Random Groestlcoin-related quote shown in footer on each page load
• New /quotes, curated list of Groestlcoin-related quotes (each quote also having its own page like this)
• Preemptive support for upcoming format change to getrawtransaction output
• Fix for incorrect homepage block count when using BTCEXP_UI_HOME_PAGE_LATEST_BLOCKS_COUNT
• Fix for inaccurate difficulty adjustment estimates
• Link to Tor v3 Hidden Service in footer
• Fix for DEBUG environment variable being ignored
• Fix for /rpc-terminal not parsing non-int parameters properly
• Fix for edge case where txindex availability check fails at startup (add retries with exp. backoff)
• Fix for tiny-value display (i.e. 1e-8 -> 0.00000001)
• Misc UI/UX tweaks
• Cache busting for frontend resources
• Improved error handling in many places
• Updated dependencies
• Fix for regtest network errors on homepage
• Fix for server errors in Docker-based installs
• Improvements to no-txindex support: now available for all versions of Groestlcoin Core
•  Add back the /peers tool in the "Tools" menu. Note: The map on the peers tool now requires users set their own BTCEXP_MAPBOX_APIKEY in .env
• Response compression
• Remove reference to unused fonts.css
• Increased static-files cache: 1hr -> 1mo
• Clearer UX around RPC connection failures (show the fact clearly, instead of flooding the log with cryptic errors)
• Fixed changelog for v3.0.0 release (added/clarified some issues)
• Updated favicons
• Fix for homepage error after failure to get AU exchange rate
• UX improvements on /peers page
• Graphs for top items in /admin/stats
• Optional support for plausible.io analytics
• Fix to avoid displaying empty "Summary" section when we fail to get address txid list
• UX improvement around electrs too-many-txs-for-address errors
• Major visual refresh:
  - All new design (layout, fonts, colors, etc)
  - Redesigned Dark Mode (now the default)
  - New app icon
• Support for pruned nodes and nodes with disabled txindex! Note: Currently only Groestlcoin Core versions 2.21+ are able to support this feature (a future improvement is planned to make it available to all versions)
• Mempool Summary improvements:
  - Greatly improved performance for multiple loads via caching
  - Added: "Blocks Count" column by fee-rate bucket
  - Tool for estimating Block Depth of a transaction or a fee rate
• Mining Summary: added doughnut chart for rev. breakdown, simplified table data
• Upgraded to Bootstrap 5 (currently beta3...)
• Update mapbox API. Note: The map on the /peers page now requires that users set the env var BTCEXP_MAPBOX_APIKEY to their own API key
• Fix for 404 pages hanging
• Add convenience redirect for baseUrl
• Make url in logs clickable
• Caching for static files (maxAge=1hr)
• Frontend performance optimizations
• Smarter performance/memory defaults for slow devices
• Major refactoring, modernization, and code-reuse improvements
• UX improvements and polish throughout
• URL changes:
  - /node-status -> /node-details
  - /unconfirmed-tx -> /mempool-transactions
• Environment variable changes:
  - The below changes were made to more clearly acknowledge that multiple Electrum-protocol implementations (e.g. ElectrumX, Electrs) can be used for address queries:
  - BTCEXP_ADDRESS_API value electrumx -> electrum (electrumx should still works)
  - BTCEXP_ELECTRUMX_SERVERS -> BTCEXP_ELECTRUM_SERVERS (BTCEXP_ELECTRUMX_SERVERS should still work)
• Updated dependencies:
  - jQuery: v3.4.1 -> v3.6.0
  - highlight.js: v9.14.2 -> v10.7.1
  - fontawesome: v5.7.1 -> v5.15.3
• New fee rate data on /block-analysis pages
• New minor misc peer data available in Groestlcoin Core RPC v2.21+
• New gold exchange rate on homepage
• Fix for SSO token generation URL encoding
• Fix for /peers map
• Fix for README git clone
• Support for running on a configurable BASEURL, e.g. "/explorer/"
• Support for SSO
• Support for signet and taproot
• Support for listening on 0.0.0.0
• Support for viewing list of block heights for each miner on /mining-summary
• Sanitizing of environment variables
• Fix for XSS vulnerabilities
• Fix for low severity lodash dependency vulnerability
• Fix for zero block reward (eventually on mainnet, now on regtest)
• Fix for cryptic error when running regtest with no blocks
• Fix for pagination errors on /blocks (not displaying genesis block on the last page; error on last page when sort=asc)
• Electrum-grs connect/disconnect stats on /admin
• Add P2SH bounty address /fun items
• Misc cleanup

Features
• Network Summary dashboard
• View details of blocks, transactions, and addresses
• Analysis tools for viewing stats on blocks, transactions, and miner activity
• See raw JSON content from groestlcoind used to generate most pages
• Search by transaction ID, block hash/height, and address
• Optional transaction history for addresses by querying from ElectrumX
• Mempool summary, with fee, size, and age breakdowns
• RPC command browser and terminal

GRS RPC Explorer testnet 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 GRS RPC Explorer testnet, no compensation will be given. Use GRS RPC Explorer testnet solely at your own risk.

GRS RPC Explorer testnet is available via https://rpcexplorer-test.groestlcoin.org/

Source code: https://github.com/Groestlcoin/grs-rpc-explorer

GRS RPC Explorer: Simple, database-free Groestlcoin blockchain explorer via RPC to Groestlcoin Core.

GRS RPC Explorer is a simple, self-hosted explorer for the Groestlcoin blockchain, driven by RPC calls to your own Groestlcoin node. It is easy to run and can be connected to other tools (like ElectrumX) to achieve a full-featured explorer.
Whatever reasons one may have for running a full node (trustlessness, technical curiosity, supporting the network, etc) it's helpful to appreciate the "fullness" of your node. With this explorer, you can explore not just the blockchain database, but also explore the functional capabilities of your own node.

Changelog 3.2.0
• Public API! See the docs at /api/docs
• XPUB pages: search for any xpub (ypub, zpub, etc) and see summary details and a list of associated addresses
• Homepage: add "Predicted Next Block" section
• Mempool Summary: add top-fee transactions table
• Improvements to transaction details UI, especially on smaller screens
• Cleanup support for Taproot/bech32m
• New /mining-template tool, showing structured output of getblocktemplate command
• Various improvements to charts and graphs throughout the tool (including lots of y-axis changes: linear->log)
• Better support for BIP9 soft forks shown on /node-details (e.g. Taproot ST in 2.21.1)
• New "Recent" and "Favorites" sections on /rpc-browser
• Block lists: show (min, avg, max) fee rates instead of just avg
• Random Groestlcoin-related quote shown in footer on each page load
• New /quotes, curated list of Groestlcoin-related quotes (each quote also having its own page like this)
• Preemptive support for upcoming format change to getrawtransaction output
• Fix for incorrect homepage block count when using BTCEXP_UI_HOME_PAGE_LATEST_BLOCKS_COUNT
• Fix for inaccurate difficulty adjustment estimates
• Link to Tor v3 Hidden Service in footer
• Fix for DEBUG environment variable being ignored
• Fix for /rpc-terminal not parsing non-int parameters properly
• Fix for edge case where txindex availability check fails at startup (add retries with exp. backoff)
• Fix for tiny-value display (i.e. 1e-8 -> 0.00000001)
• Misc UI/UX tweaks
• Cache busting for frontend resources
• Improved error handling in many places
• Updated dependencies
• Fix for regtest network errors on homepage
• Fix for server errors in Docker-based installs
• Improvements to no-txindex support: now available for all versions of Groestlcoin Core
•  Add back the /peers tool in the "Tools" menu. Note: The map on the peers tool now requires users set their own BTCEXP_MAPBOX_APIKEY in .env
• Response compression
• Remove reference to unused fonts.css
• Increased static-files cache: 1hr -> 1mo
• Clearer UX around RPC connection failures (show the fact clearly, instead of flooding the log with cryptic errors)
• Fixed changelog for v3.0.0 release (added/clarified some issues)
• Updated favicons
• Fix for homepage error after failure to get AU exchange rate
• UX improvements on /peers page
• Graphs for top items in /admin/stats
• Optional support for plausible.io analytics
• Fix to avoid displaying empty "Summary" section when we fail to get address txid list
• UX improvement around electrs too-many-txs-for-address errors
• Major visual refresh:
  - All new design (layout, fonts, colors, etc)
  - Redesigned Dark Mode (now the default)
  - New app icon
• Support for pruned nodes and nodes with disabled txindex! Note: Currently only Groestlcoin Core versions 2.21+ are able to support this feature (a future improvement is planned to make it available to all versions)
• Mempool Summary improvements:
  - Greatly improved performance for multiple loads via caching
  - Added: "Blocks Count" column by fee-rate bucket
  - Tool for estimating Block Depth of a transaction or a fee rate
• Mining Summary: added doughnut chart for rev. breakdown, simplified table data
• Upgraded to Bootstrap 5 (currently beta3...)
• Update mapbox API. Note: The map on the /peers page now requires that users set the env var BTCEXP_MAPBOX_APIKEY to their own API key
• Fix for 404 pages hanging
• Add convenience redirect for baseUrl
• Make url in logs clickable
• Caching for static files (maxAge=1hr)
• Frontend performance optimizations
• Smarter performance/memory defaults for slow devices
• Major refactoring, modernization, and code-reuse improvements
• UX improvements and polish throughout
• URL changes:
  - /node-status -> /node-details
  - /unconfirmed-tx -> /mempool-transactions
• Environment variable changes:
  - The below changes were made to more clearly acknowledge that multiple Electrum-protocol implementations (e.g. ElectrumX, Electrs) can be used for address queries:
  - BTCEXP_ADDRESS_API value electrumx -> electrum (electrumx should still works)
  - BTCEXP_ELECTRUMX_SERVERS -> BTCEXP_ELECTRUM_SERVERS (BTCEXP_ELECTRUMX_SERVERS should still work)
• Updated dependencies:
  - jQuery: v3.4.1 -> v3.6.0
  - highlight.js: v9.14.2 -> v10.7.1
  - fontawesome: v5.7.1 -> v5.15.3
• New fee rate data on /block-analysis pages
• New minor misc peer data available in Groestlcoin Core RPC v2.21+
• New gold exchange rate on homepage
• Fix for SSO token generation URL encoding
• Fix for /peers map
• Fix for README git clone
• Support for running on a configurable BASEURL, e.g. "/explorer/"
• Support for SSO
• Support for signet and taproot
• Support for listening on 0.0.0.0
• Support for viewing list of block heights for each miner on /mining-summary
• Sanitizing of environment variables
• Fix for XSS vulnerabilities
• Fix for low severity lodash dependency vulnerability
• Fix for zero block reward (eventually on mainnet, now on regtest)
• Fix for cryptic error when running regtest with no blocks
• Fix for pagination errors on /blocks (not displaying genesis block on the last page; error on last page when sort=asc)
• Electrum-grs connect/disconnect stats on /admin
• Add P2SH bounty address /fun items
• Misc cleanup

Features
• Network Summary dashboard
• View details of blocks, transactions, and addresses
• Analysis tools for viewing stats on blocks, transactions, and miner activity
• See raw JSON content from groestlcoind used to generate most pages
• Search by transaction ID, block hash/height, and address
• Optional transaction history for addresses by querying from ElectrumX
• Mempool summary, with fee, size, and age breakdowns
• RPC command browser and terminal

GRS RPC Explorer 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 GRS RPC Explorer, no compensation will be given. Use GRS RPC Explorer solely at your own risk.

GRS RPC Explorer is available via https://rpcexplorer.groestlcoin.org/

Source code: https://github.com/Groestlcoin/grs-rpc-explorer

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

https://www.youtube.com/watch?v=qNMTDEPhWhY

Changelog v1.2.3.0
• Add payjoin to hot wallet setup and turn on by default
• Support spending to Taproot
• Show Immature Balance in walletsend page
• Auto-detect language on payment page
• Pull payments: Detect External OnChain Payouts
• Allow marking payout as paid manually
• Use CSP to prevent future XSS attacks.
• Fix XSS vulnerabilities in summernote, the rich text editor

Features
• Direct, P2P Groestlcoin Testnet payments
• Lightning Network Testnet support
• 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 our host. The self-hosted solution allows you not only to attach an unlimited number of stores but also become the payment processor for others.
• Open Source - MIT license

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.

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

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

https://www.youtube.com/watch?v=qNMTDEPhWhY

Changelog v1.2.3.0
• Add payjoin to hot wallet setup and turn on by default
• Support spending to Taproot
• Show Immature Balance in walletsend page
• Auto-detect language on payment page
• Pull payments: Detect External OnChain Payouts
• Allow marking payout as paid manually
• Use CSP to prevent future XSS attacks.
• Fix XSS vulnerabilities in summernote, the rich text editor

Features
• Direct, P2P Groestlcoin payments
• Lightning Network support
• Complete control over private keys
• Enchanced privacy
• SegWit support
• Process payments for others
• Easy-embeddable Payment buttons
• Point of sale app
• 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 our host. The self-hosted solution allows you not only to attach an unlimited number of stores but also become the payment processor for others.
• Open Source - MIT license

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.

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

C-lightning: A specification compliant Lightning Network implementation in C

C-lightning is a lightweight, highly customizable and standard compliant implementation of the Lightning Network protocol.
C-lightning only works on Linux and Mac OS, and requires a locally (or remotely) running groestlcoind (version 2.16.0 or above) that is fully caught up with the network you're testing on.

Changelog 0.10.1
• experimental-dual-fund allows advertizement of funding rates which we will contribute to channels automatically, on a 1-month lease.
• withdraw and close (if peer supports) now supports Taproot (and other future) addresses.
• listchannels can now be queried by destination, as well as source.
• plugin rescan now automatically reloads plugins which have changed.
• We try to restart automatically if we notice subdaemons have been upgraded underneath us.
• fundpsbt will no longer include uneconomic UTXOs (unless all).
• close will return a stream of notifications if there is a delay in closing.
• Unilateral close feerates were reduced from groestlcoind's "2 CONSERVATIVE" to "6 ECONOMICAL".
• Tor v2 is deprecated: please upgrade to v3!
• Fixed disconnection bug when an HTLC failed.
• Fixed bug in rapid feerate changes, and make code space them out (LND compat).
• Fixed bug where Tor on different ports could be advertized incorrectly.
• Fixed various bugs to make pay more robust.
• payment secrets in invoices are now compulsory, finally closing a potential probing (or, with amountless invoices, stealing) attack.
• option_shutdown_anysegwit allows peers to close channels to any future segwit version address (taproot!).
• keysend now understands routehints, for routing to unpublished nodes, and sets the final CLTV to 22, for rust-lightning nodes.
• invoice now allows creation of wumbo invoices (> 0.0429 GRS).
• We will now discuss old channels with peers who reconnect, even if we consider them closed.
• Manual pages now document exactly the JSON you can expect from each command (and it's tested!)
• Plugins can now publish notifications for other plugins to listen to.
• force-feerates allows complete feerate override (mainly for regtest), and a bug fixed where we could send 0 update_fee on regtest.
• The HSM daemon is now separated into libhsmd, which also provides Python bindings.
• createonion can now make variable-sized onions, and sendonion no longer requires direction and channel for firsthop.
• dev-sendcustommsg is now simply sendcustommsg.
• Many offers API improvements and updates, including unsigned offers (smaller QR codes!).

Features
• Creating channels.
• Closing channels.
• Completely managing all channel states (including the exceptional ones!).
• Performing path finding within the network, passively forwarding incoming payments.
• Sending outgoing onion-encrypted payments through the network.
• Automatic channel management (autopilot).

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.

Linux: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-ubuntu
OSX: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-macos

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

Electrum-grs is a lightweight "thin client" groestlcoin wallet Android based on a client-server protocol. Its main advantages over the original Groestlcoin client include support for multi-signature wallets and not requiring the download of the entire block chain.

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

Changelog 4.1.5
• Kivy/Android: fix a regression where a non-LN wallet could not open the settings
• Kivy/Android: fix paying bip70 invoices (regression)
• Kivy GUI: implement freezing LN channels

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

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

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

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

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

Electrum-grs is a lightweight "thin client" groestlcoin wallet Windows, MacOS and Linux based on a client-server protocol. Its main advantages over the original Groestlcoin client include support for multi-signature wallets and not requiring the download of the entire block chain.

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

Changelog 4.1.5
• Builds/binaries:
   - Android: the binaries (APKs) should now be reproducible
   - AppImage: fix some startup issues by including libxcb deps
   - macOS: the .dmg binary should now be reproducible
• Lightning:
   - smarter LN pathfinding (if trampoline is disabled):
     - estimate liquidity in channels using previous attempts
     - consider inflight HTLCs and try to route around them
   - bugfix: add more safety checks to avoid "batch RBF" feature
     merging LN funding txs
   - remove HTLC value upper limit of ~42 mGRS
   - improve payment success when using trampoline
• imported wallets: when enabling the "Use change addresses" option, change will now be sent to a random unused imported address. As before, by default, change is sent back to the "from address".
• seed generation: make sure newly created electrum-grs seeds don't have correct bip39 checksum by chance
• other minor fixes
• CLI/RPC: fix "close_wallet" command
• fix: payment requests not saved if process is killed
• add support for signet test network
• Qt GUI:
   - allow restoring from SLIP39 seeds
   - rework QR code scanning on Windows and macOS
   - support smaller window sizes, decrease minimums
• GUIs: add "funded or unused" filter option to Addresses tab

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

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

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

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

Download the OSX wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.1.5/electrum-grs-4.1.5.dmg

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.1.5/electrum-grs-4.1.5-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.1.5/electrum-grs-4.1.5.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.1.5/electrum-grs-4.1.5-portable.exe
                                       
Download Linux installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.1.5/electrum-grs-4.1.5-x86_64.AppImage

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

[What's new in version v22.0?This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v22.0 but with Groestlcoin specific patches.]

A new major Groestlcoin Core version 22.0 is now available for download, so it is recommended to upgrade to it if you are running a full Groestlcoin node or a local Groestlcoin Core wallet.

v22.0 is now the official release version of Groestlcoin Core. It is recommended to upgrade to this version as soon as possible.

What's new in version v22.0?
This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v22.0 but with Groestlcoin specific patches.

Changelog 22.0:
https://github.com/Groestlcoin/groestlcoin/blob/22.0.0/doc/release-notes/release-notes-22.0.0.md

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, v2.16.0, v2.16.3, v2.17.2, v2.18.2, v2.19.1, v2.21.0 and v2.21.1 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.
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. Users running macOS Catalina need to "right-click" and then choose "Open" to open the Groestlcoin Core .dmg.

Download the Windows Installer (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-win64-setup-unsigned.exe
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-win64.zip

Download the OSX Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-osx-unsigned.dmg
Download the OSX binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-osx64.tar.gz

Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-x86_64-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-arm-linux-gnueabihf.tar.gz
Download the RISC-V Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-riscv64-linux-gnu.tar.gz
Download PowerPC linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-powerpc64-linux-gnu.tar.gz
Download PowerPC LE linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v22.0/groestlcoin-22.0-powerpc64le-linux-gnu.tar.gz
Linux Snapcraft: https://snapcraft.io/groestlcoin-core
Linux Flathub: https://flathub.org/apps/details/org.groestlcoin.groestlcoin-qt
Linux Launchpad: https://launchpad.net/~groestlcoin/+archive/ubuntu/groestlcoin

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