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Groestlcoin Electrum Personal Server: Maximally lightweight electrum-grs server for a single user

Groestlcoin Electrum Personal Server aims to make using Electrum groestlcoin wallet more secure and more private. It makes it easy to connect your Electrum-GRS wallet to your own full node.
It is an implementation of the Electrum-grs server protocol which fulfills the specific need of using the Electrum-grs wallet backed by a full node, but without the heavyweight server backend, for a single user. It allows the user to benefit from all of Groestlcoin Core's resource-saving features like pruning, blocksonly and disabled txindex. All of Electrum-GRS's feature-richness like hardware wallet integration, multisignature wallets, offline signing, seed recovery phrases, coin control and so on can still be used, but connected only to the user's own full node.
Full node wallets are important in groestlcoin because they are an big part of what makes the system be trustless. No longer do people have to trust a financial institution like a bank or paypal, they can run software on their own computers. If groestlcoin is digital gold, then a full node wallet is your own personal goldsmith who checks for you that received payments are genuine.
Full node wallets are also important for privacy. Using Electrum-GRS under default configuration requires it to send (hashes of) all your groestlcoin addresses to some server. That server can then easily spy on your transactions. Full node wallets like Groestlcoin Electrum Personal Server would download the entire blockchain and scan it for the user's own addresses, and therefore don't reveal to anyone else which groestlcoin addresses they are interested in. Groestlcoin Electrum Personal Server can also broadcast transactions through Tor which improves privacy by resisting traffic analysis for broadcasted transactions which can link the IP address of the user to the transaction. If enabled this would happen transparently whenever the user simply clicks "Send" on a transaction in Electrum-grs wallet.

Changelog 0.2.4
• Fixed crash caused by deprecated RPC in Groestlcoin Core 23.0
• Added signet support

Features:
• Use your own node
• Tor support
• Uses less CPU and RAM than electrumx
• Used intermittently rather than needing to be always-on
• Doesn't require an index of every groestlcoin address ever used like on electrumx

How To
• If you dont already have them, download and install Groestlcoin Core version 2.17.2 or higher. The Groestlcoin node must have wallet enabled, and must have the RPC server switched on (server=1 in groestlcoin.conf). On first run, it is recommended to create a wallet dedicated to Groestlcoin Electrum Personal Server using the command line argument groestlcoin-cli createwallet electrumpersonalserver true.
• If you dont already have it, download and install Electrum-grs wallet, and set up your Electrum-grs wallet (for example by linking your hardware wallet). To avoid damaging privacy by connecting to public Electrum-GRS servers, disconnect from the internet first or run Electrum-grs with the command line argument --server localhost:50002:s.
• Download the latest release of Groestlcoin Electrum Personal Server. If using Windows OS take the packaged binary release build electrum-grs-personalserver-windows-release-XXX.zip.
• Extract and enter the directory, and copy the file config.ini_sample to config.ini. Edit the file config.ini to configure everything about the server. Add your wallet master public keys or watch-only addresses to the [master-public-keys] and [watch-only-addresses] sections. Master public keys for an Electrum-grs wallet (which start with xpub/ypub/zpub/etc) can be found in the Electrum-grs client menu Wallet -> Information. You can add multiple master public keys or watch-only addresses by adding separate lines for the different keys/addresses:
wallet1 = xpub661MyMwAqRbcF...
wallet2 = xpub7712KLsfsg46G...
• If you created a wallet dedicated to Groestlcoin Electrum Personal Server in Groestlcoin Core, you have to modify the line wallet_filename in the [groestlcoin-rpc] section with the name of the wallet, for example electrumpersonalserver.
• If using the windows packaged binary release, drag the file config.ini onto the file electrum-personal-server.exe to run the server, or on the command line run electrum-personal-server config.ini.
• If installing from the source release, install Groestlcoin Electrum Personal Server in your home directory with pip3 install --user .. On Linux the script electrum-personal-server will be installed in ~/.local/bin. Please note, if for some reason, you want to make a system-wide install, simply run pip3 install . as root (e.g. if you have sudo setup, you could use: sudo pip3 install .). Run electrum-personal-server /path/to/config.ini to start Groestlcoin Electrum Personal Server.
• The first time the server is run it will import all configured addresses as watch-only into the Groestlcoin node, and then exit. If the wallets contain historical transactions you can use the rescan script (electrum-personal-server --rescan /path/to/config.ini) to make them appear. If using the windows packaged binary release build then drag the file config.ini onto the file electrum-personal-server-rescan.bat.
• Run the server again which will start Groestlcoin Electrum Personal Server. Wait until the message Listening for Electrum-grs Wallet ... appears and then tell Electrum-grs to connect to the server in Tools -> Server. By default the server details are localhost if running on the same machine. Make sure the port number matches what is written in config.ini (port 50002 by default).

This application is licensed under the 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.

Windows: https://github.com/Groestlcoin/electrum-personal-server/releases/download/eps-v0.2.4-grs/electrum-grs-personal-server-windows-release-v0.2.4.zip
Linux: https://github.com/Groestlcoin/electrum-personal-server#quick-start-on-a-debianubuntu-machine-with-a-running-groestlcoin-full-node
OSX: https://github.com/Groestlcoin/electrum-personal-server#quick-start-on-a-debianubuntu-machine-with-a-running-groestlcoin-full-node

Note: Right now Groestlcoin Electrum Personal Server can only accept one connection at a time.

Source code: https://github.com/Groestlcoin/electrum-personal-server

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 v1.5.4.0
• New dashboard
• Wallet transactions export
• Allow resending verification email for users
• Allow Users to be disabled/enabled
• Add additional rate providers as supported from CoinGecko

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 v1.5.4.0
• New dashboard
• Wallet transactions export
• Allow resending verification email for users
• Allow Users to be disabled/enabled
• Add additional rate providers as supported from CoinGecko

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 0.11.1
• Protocol: we now support opening multiple channels with the same peer.
• Protocol: we send/receive IP addresses in init, and send updated node_announcement when two peers report the same remote_addr (disable-ip-discovery suppresses this announcement).
• Protocol: we more aggressively send our own gossip, to improve propagation chances.
• Plugins: cln-grpc first class GRPC interface for remotely controlling nodes over mTLS authentication; set grpc-port to activate.
• Database: With the sqlite3:// scheme for --wallet option, you can now specify a second file path for real-time database backup by separating it from the main file path with a : character.
• Protocol: pay (and decode, etc) supports bolt11 payment_metadata a-la lightning/bolts#912
• JSON-RPC: invoice has a new parameter deschashonly to put hash of description in bolt11.
• JSON-RPC: pay has new parameter description, will be required if bolt11 only has a hash.
• JSON-RPC: pay has new parameter maxfee for setting absolute fee (instead of using maxfeepercent and/or exemptfee)
• JSON-RPC: listforwards has new entry style, currently "legacy" or "tlv".
• JSON-RPC: delinvoice has a new parameter desconly to remove description.
• JSON-RPC: new setchannel command generalizes setchannelfee: you can now alter the htlc_minimum_msat and htlc_maximum_msat your node advertizes.
• Config: htlc-minimum-msat and htlc-maximum-msat to set default values to advertizes for new channels.
• JSON-RPC: listpeers now includes a pushed_msat value. For leased channels, is the total lease_fee.
• JSON-RPC: getinfo result now includes our_features (bits) for various Bolt #9 contexts
• Docker build for ARM defaults to groestlcoin, but can be overridden with the LIGHTNINGD_NETWORK envvar.
• Developer: A new Rust library called cln-rpc can be used to interact with the JSON-RPC.
• JSON-RPC: A new msggen library allows easy generation of language bindings for the JSON-RPC from the JSON schemas.
• JSON-RPC: listchannels now includes the funding_outnum.
• JSON-RPC: coin_movement to 'external' accounts now include an 'originating_account' field.
• JSON-RPC: Add exclude option for pay command to manually exclude channels or nodes when finding a route.
• Database: Speed up loading of pending HTLCs during startup by using a partial index.

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
Fedora: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-fedora
OpenBSD: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-openbsd

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

[What's new in version v23.0?This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v23.0 but with Groestlcoin specific patches.]

A new major Groestlcoin Core version 23.0 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.

v23.0 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 v23.0?
This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v23.0 but with Groestlcoin specific patches.

Changelog 23.0:
https://github.com/Groestlcoin/groestlcoin/blob/23.0.0/doc/release-notes/release-notes-23.0.0.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, v2.21.1 and 22.0.0 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.
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/v23.0/groestlcoin-23.0-win64-setup.exe
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-win64.zip

Download the OSX Intel based Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-x86_64-apple-darwin.dmg
Download the OSX Intel based binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-x86_64-apple-darwin.tar.gz
Download the OSX ARM Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-arm64-apple-darwin.dmg
Download the OSX ARM binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-arm64-apple-darwin.tar.gz

Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-x86_64-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-arm-linux-gnueabihf.tar.gz
Download the RISC-V Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-riscv64-linux-gnu.tar.gz
Download PowerPC linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-powerpc64-linux-gnu.tar.gz
Download PowerPC LE linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v23.0/groestlcoin-23.0-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
NixOS: https://search.nixos.org/packages?channel=unstable&show=groestlcoin&from=0&size=50&sort=relevance&type=packages&query=groestlcoin
Homebrew Cask: https://formulae.brew.sh/cask/groestlcoin-core
Homebrew: https://formulae.brew.sh/formula/groestlcoin
Arch Linux User Repository: https://aur.archlinux.org/pkgbase/groestlcoin

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

[The following were tested in Ubuntu 14.04, Ubuntu 16.04 and Ubuntu 18.04]

The following were tested in Ubuntu 14.04, Ubuntu 16.04 and Ubuntu 18.04, 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 half a hour), verify with groestlcoin-cli -signet getnetworkinfo

[The following were tested in Ubuntu 16.04]

The following were tested in Ubuntu 16.04, 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
• 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 1 hour), verify with groestlcoin-cli -testnet getinfo
• cd ~
• git clone https://github.com/Groestlcoin/electrumx-grs-installer.git
• cd electrumx-grs-installer
• sudo -H ./install.sh
• nano /etc/electrumx.conf
• change DAEMON_URL to http://yourusernamehere:yourpasswordhere@localhost/
• Add these:
  NET = signet
  COIN = Groestlcoin
  SERVICES=tcp://:52001,ssl://:52002,wss://:52004
  REPORT_SERVICES=tcp://yourhost:52001,ssl://YourHost:52002
• Crtl+o enter, ctrl X
• service electrumx-grs start
• add your server on https://1209k.com/bitcoin-eye/ele.php?chain=sgrs

check logs with: journalctl -u electrumx-grs -f

[The following were tested in Linux archlinux 5.15.44-1-lts]

The following were tested in Linux archlinux 5.15.44-1-lts, some dependencies can be different in other distros.
If you have issues make sure:
     - HyperVM is enabled in bios (to enable 64bit in virtualbox)
     - Hyper V is uninstalled on Windows
     - Disable mcafee anti-virus, Malwarebytes and roquekiller
     - Disable sleep/hibernate mode on windows

Create a Arch VM as a building environment (it will be accessed via SSH) Follow the instructions at: https://itsfoss.com/install-arch-linux-virtualbox/

You will need an aur.archlinux.org account to publish a package. You need to have a new Public SSH key (generated below) and your public GPG key registered with your account.

Set port forwarding rule on virtualbox:
name: SSH
protocol: TCP
hostport: 22222
guest port: 22

sudo systemctl enable sshd
sudo systemctl start sshd

#Export your key (or export private key on Kleopatra):
gpg --export-secret-keys $ID > my-private-key.asc
# Copy the key to the VM. To copy the exported secret-keys you can use SFTP client on portnumber 22222
#To import the key, run:
gpg --import my-private-key.asc
#Setup a passphrase for the secret key when asked
gpg --edit-key $ID
passwd
#Enter existing passphrase then press enter twice and consider the warnings from the tool and its implications before proceeding.

pacman -Syuq --noconfirm --needed $(pacman -Sgq base-devel | grep -v gcc) gcc-multilib && rm -rf /var/cache/pacman/pkg/*
pacman -Syuq --noconfirm --needed git mercurial bzr subversion openssh && rm -rf /var/cache/pacman/pkg/*
pacman -S nano

sudo nano ~/.gnupg/gpg.conf
default-key D11BD4F33F1DB499
trusted-key D11BD4F33F1DB499
ctrl+o , ctrl+x

sudo nano ~/.makepkg.conf
PACKAGER="groestlcoin <[email protected]>"
GPGKEY="0xD11BD4F33F1DB499"
ctrl+o , ctrl+x

ssh-keygen -f ~/.ssh/aur

sudo nano ~/.ssh/config
Host aur.archlinux.org
  IdentityFile ~/.ssh/aur
  User aur
ctrl+o , ctrl+x

git config --global user.name "gruve-p"
git config --global user.email [email protected]
git config --global user.signingkey D11BD4F33F1DB499
git config --global core.editor nano

#test the package
makepkg -s

git clone ssh://[email protected]/groestlcoin.git
cd groestlcoin
makepkg --printsrcinfo > .SRCINFO
git add Changelog groestlcoin-qt.appdata.xml  groestlcoin-qt.desktop  groestlcoin.sysusers  groestlcoin.tmpfiles  PKGBUILD .SRCINFO
git commit -m "Add groestlcoin pkgbase"
git push

Be sure to regenerate .SRCINFO whenever PKGBUILD metadata changes, such as pkgver() updates; otherwise the AUR will not show updated version numbers.

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 v1.4.7.0
• UX/UI: Easier onboarding
• UX/UI: New navigation
• Greenfield: Add a missingPermission field to 403 errors
• Support for new TLS version of SMTP server
• Greenfield: Added field "StoreId" to a Payment Request
• Greenfield: Can create a payment request without specifying currency (would then use store's default currency)
• Add login code, for easy login to GRSPay Server via a mobile device
• Add LNUrl Auth support as second factor auth
• Batch unarchive invoices
• Ability to bump fees of transactions and invoices via CPFP
• Add ability to add description to pull payment
• Greenfield: Can add store guest/owner to a store
• Plugins: Expose file service
• Plugins: Allow writing Greenfield API endpoints

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 v1.4.7.0
• UX/UI: Easier onboarding
• UX/UI: New navigation
• Greenfield: Add a missingPermission field to 403 errors
• Support for new TLS version of SMTP server
• Greenfield: Added field "StoreId" to a Payment Request
• Greenfield: Can create a payment request without specifying currency (would then use store's default currency)
• Add login code, for easy login to GRSPay Server via a mobile device
• Add LNUrl Auth support as second factor auth
• Batch unarchive invoices
• Ability to bump fees of transactions and invoices via CPFP
• Add ability to add description to pull payment
• Greenfield: Can add store guest/owner to a store
• Plugins: Expose file service
• Plugins: Allow writing Greenfield API endpoints

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

Groestlcoin Esplora Signet is an open-source Groestlcoin blockchain signet explorer.

Groestlcoin Esplora Signet JSON over RESTful API provides you with a convenient, powerful and simple way to read data from the groestlcoin signet network and build your own services with it.

Features
• Explore blocks, transactions and addresses
• Support for Segwit and Bech32 addresses
• Shows previous output and spending transaction details
• Quick-search for txid, address, block hash or height by navigating to /<query>
• Advanced view with script hex/assembly, witness data, outpoints and more
• Mobile-ready responsive design
• Translated to 17 languages
• Light and dark themes
• Noscript support
• Transaction broadcast support
• QR scanner
• API support

Groestlcoin Esplora Signet 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 Groestlcoin Esplora Signet, no compensation will be given. Use Groestlcoin Esplora Signet solely at your own risk.

Groestlcoin Esplora Signet is available via https://esplora-signet.groestlcoin.org/

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

Groestlcoin Esplora Testnet is an open-source Groestlcoin blockchain testnet explorer.

Groestlcoin Esplora Testnet JSON over RESTful API provides you with a convenient, powerful and simple way to read data from the groestlcoin testnet network and build your own services with it.

Changelog
• Taproot support
• New UI Design

Features
• Explore blocks, transactions and addresses
• Support for Segwit and Bech32 addresses
• Shows previous output and spending transaction details
• Quick-search for txid, address, block hash or height by navigating to /<query>
• Advanced view with script hex/assembly, witness data, outpoints and more
• Mobile-ready responsive design
• Translated to 17 languages
• Light and dark themes
• Noscript support
• Transaction broadcast support
• QR scanner
• API support

Groestlcoin Esplora 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 Groestlcoin Esplora Testnet, no compensation will be given. Use Groestlcoin Esplora Testnet solely at your own risk.

Groestlcoin Esplora Testnet is available via https://esplora-test.groestlcoin.org/

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

Groestlcoin Esplora is an open-source Groestlcoin blockchain explorer.

Groestlcoin Esplora JSON over RESTful API provides you with a convenient, powerful and simple way to read data from the groestlcoin network and build your own services with it.

Changelog
• Taproot support
• New UI Design

Features
• Explore blocks, transactions and addresses
• Support for Segwit and Bech32 addresses
• Shows previous output and spending transaction details
• Quick-search for txid, address, block hash or height by navigating to /<query>
• Advanced view with script hex/assembly, witness data, outpoints and more
• Mobile-ready responsive design
• Translated to 17 languages
• Light and dark themes
• Noscript support
• Transaction broadcast support
• QR scanner
• API support

Groestlcoin Esplora 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 Groestlcoin Esplora, no compensation will be given. Use Groestlcoin Esplora solely at your own risk.

Groestlcoin Esplora is available via https://esplora.groestlcoin.org/

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

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 4.2.0
• Kivy GUI:
   - show network setup on first start before wallet creation
   - add "Child Pays For Parent" option
   - improved locale handling

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 4.2.0
• macOS builds are now codesigned and notarized
• The minimum python version was increased to 3.8
• Lightning:
   - redesigned MPP splitting algorithm
   - trampoline: implement multi-trampoline MPP
   - implement option_shutdown_anysegwit, and allow dust limits below 546 gro
   - implement option_channel_type
   - implement modern closing negotiation
• improve support for "lightning:" URIs on all platforms
• Qt GUI:
   - add setting "show amounts with msat precision"
   - add setting "add thousand separators to groestlcoin amounts"
• CLI/RPC:
   - implement Unix sockets and make them the default
   - add "bumpfee" command
• Hardware wallets:
   - trezor: bump trezorlib to 0.13
   - ledger: support "Ledger Nano S Plus"
• Library:
   - added support for sighash types beside "ALL"
   - signmessage: also accept Trezor-type sigs for segwit addrs
   - network: make request timeout configurable
   - paytomany (onchain txout batching) now allows multiple max("!") amounts with specified weights
• Binary builds
   - AppImage: changed base image from ubuntu 16.04 to 18.04
• Integration of Cirrus CI and Github Actions
• Lots of other minor bugfixes and usability improvements.

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/v4.2.0/electrum-grs-4.2.0.dmg

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.2.0/electrum-grs-4.2.0-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.2.0/electrum-grs-4.2.0.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.2.0/electrum-grs-4.2.0-portable.exe
                                       
Download Linux installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.2.0/electrum-grs-4.2.0-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