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[What's new in version v28.0?This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v28.0 but with Groestlcoin specific patches.]

A new major Groestlcoin Core version 28.0 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.

v28.0 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 v28.0?
This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v28.0 but with Groestlcoin specific patches.

Changelog 28.0:
https://github.com/Groestlcoin/groestlcoin/blob/28.0.0/doc/release-notes/release-notes-28.0.0.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, v22.0.0, v23.0.0, v24.0.1, v25.0.0, v26.0.0 and v27.0.0 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/v28.0/groestlcoin-28.0-win64-setup.exe
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-win64.zip

Download the OSX Intel based Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-x86_64-apple-darwin.zip
Download the OSX Intel based binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-x86_64-apple-darwin.tar.gz
Download the OSX ARM Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-arm64-apple-darwin.zip
Download the OSX ARM binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-arm64-apple-darwin.tar.gz

Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-x86_64-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-arm-linux-gnueabihf.tar.gz
Download the RISC-V Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-riscv64-linux-gnu.tar.gz
Download PowerPC linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-powerpc64-linux-gnu.tar.gz
Download PowerPC LE linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v28.0/groestlcoin-28.0-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

[What's new in version v27.0?This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v27.0 but with Groestlcoin specific patches.]

A new major Groestlcoin Core version 27.0 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.

v27.0 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 v27.0?
This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v27.0 but with Groestlcoin specific patches.

Changelog 27.0:
https://github.com/Groestlcoin/groestlcoin/blob/27.0.0/doc/release-notes/release-notes-27.0.0.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, v22.0.0, v23.0.0, v24.0.1, v25.0.0, v26.0.0 and v27.0.0 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/v27.0/groestlcoin-27.0-win64-setup.exe
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-win64.zip

Download the OSX Intel based Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-x86_64-apple-darwin.zip
Download the OSX Intel based binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-x86_64-apple-darwin.tar.gz
Download the OSX ARM Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-arm64-apple-darwin.zip
Download the OSX ARM binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-arm64-apple-darwin.tar.gz

Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-x86_64-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-arm-linux-gnueabihf.tar.gz
Download the RISC-V Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-riscv64-linux-gnu.tar.gz
Download PowerPC linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-powerpc64-linux-gnu.tar.gz
Download PowerPC LE linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v27.0/groestlcoin-27.0-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

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 v1.12.5
• With this release we upgrade to .NET 8, which also requires a current version of the Docker engine for docker deployments (>= 20.10.10).
• We are ending support for Postgresql 11 as it reached 5 years after its initial release.
• Webhooks: Support for Payment Requests, Payouts and extendibility by plugins
• Support BIP129 Multisig wallet import
• POS Keypad: Add plus and change clear functionality
• Forms: Support adjusting invoice amount by multiplier, enables percentage-based discount codes
• Can pair or reset a Boltcard to a pull payment
• Plugins: Allow scheduling installs/updates of future plugins
• Checkout: NFC improvements
• Checkout: Receipt improvements
• Payment Request: Improve public view
• POS Keypad: List recent transactions
• POS Cart: Add options for search and categories display
• POS Cart: Horizontal scrollable filters
• POS and Crowdfund: Item editor improvements
• Reporting: UI improvements
• Server Policies: Add warnings for certain options
• Greenfield: Remove unused checkout type setting from POS
• Greenfield: Make checkout type V2 default for new stores
• Domain mapping: Redirect root app to canonical URL
• Store Branding: Use store logo as favicon
• Rate Providers: Remove Bittrex
• UI: Unify list views
• UI: Unify public page styles
• UI: Add system option for theme switch
• UI: Pull payment improvements
• UI: Switch pos data to metadata in invoice create view
• UI: Improve invoice's webhooks table
• UI: Remove forced center alignment for POS description

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 v1.12.5
• With this release we upgrade to .NET 8, which also requires a current version of the Docker engine for docker deployments (>= 20.10.10).
• We are ending support for Postgresql 11 as it reached 5 years after its initial release.
• Webhooks: Support for Payment Requests, Payouts and extendibility by plugins
• Support BIP129 Multisig wallet import
• POS Keypad: Add plus and change clear functionality
• Forms: Support adjusting invoice amount by multiplier, enables percentage-based discount codes
• Can pair or reset a Boltcard to a pull payment
• Plugins: Allow scheduling installs/updates of future plugins
• Checkout: NFC improvements
• Checkout: Receipt improvements
• Payment Request: Improve public view
• POS Keypad: List recent transactions
• POS Cart: Add options for search and categories display
• POS Cart: Horizontal scrollable filters
• POS and Crowdfund: Item editor improvements
• Reporting: UI improvements
• Server Policies: Add warnings for certain options
• Greenfield: Remove unused checkout type setting from POS
• Greenfield: Make checkout type V2 default for new stores
• Domain mapping: Redirect root app to canonical URL
• Store Branding: Use store logo as favicon
• Rate Providers: Remove Bittrex
• UI: Unify list views
• UI: Unify public page styles
• UI: Add system option for theme switch
• UI: Pull payment improvements
• UI: Switch pos data to metadata in invoice create view
• UI: Improve invoice's webhooks table
• UI: Remove forced center alignment for POS description

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

Core lightning: A specification compliant Lightning Network implementation in C

Core lightning is a lightweight, highly customizable and standard compliant implementation of the Lightning Network protocol.
Core lightning only works on Linux and Mac OS, and requires a locally (or remotely) running groestlcoind (version 22.0 or above) that is fully caught up with the network you're testing on.

Changelog 24.02.1
• The recover plugin can now detect dataloss and guide you through the recovery process, making emergency recoveries less stressful.
• The logic of the anchor channels has been overhauled and channel fundings and closing should now be more flexible and reliable.
• reckless, our plugin manager, now knows how to create python virtualenvs for each plugin. This allows running multiple plugins with conflicting dependencies. Furthermore it can be told an exact version or commit to install.
• CLN now has a --no-reconnect-private, which tells lightningd not to reconnect private peers. This is useful for service-providers and LSPs if the majority of peers is flaky.
• The newest version of the splicing proposal was implemented. Though experimental we encourage anyone to try it out, as it informs the specification process as well.

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.

Ubuntu: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-ubuntu
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
OSX: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-macos
Arch Linux: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-arch-linux
Raspberry Pi: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-cross-compile-for-raspberry-pi
Armbian: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-compile-for-armbian
Alpine: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-compile-for-alpine

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 4.5.4
• port to Qt6
• fix invoice amount bounds check
• fix places where text was rendered off-screen for certain translations
• fix BIP39 cosigner script type must be same as primary
• fix: never use current fiat exchange rate for old historical amounts
• better handle android back-gesture
• new: show private key in address details
• new: show tx inputs in TxDetails and other dialogs
• new: label sync plugin toggle
• new: message sign & verify
• new: allow never expiring payment requests
• new: add coins/UTXOs to addresses list, add filters
• new: delete addresses from imported wallet
• new: add support for lightning address and openalias
• new: add setting to allow screenshots everywhere
• simplify welcome page for first-start network settings
• bump min required android version from android 5.0 to 6.0 (older versions have not been working in practice since at least 4.4.0)
• properly refresh history if addresses are deleted from imported wallets
• fix crash for new wallets having cosigner using hww
• fix crash in finalizer when txid is undefined
• various UI fixes
• fix potential concurrency issue loading wallet

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/spesmilo/electrumx
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 4.5.4
• enforce that we run with python asserts enabled, regardless of platform
• Trezor: support longer than 9 character PIN codes
• include AppStream metainfo.xml in tarballs
• fix: exceptions in some callbacks got lost and not logged
• remove SSL options from config
• make number of logfiles to keep configurable
• refactored SimpleConfig and added ConfigVars
• incremental writes of wallet file
• add warnings and prompt users when signing txs with non-default sighashes
• add option to merge duplicate outputs
• fix: consider bip21 URIs as invalid if they contain unknown req-* param
• port wizard to new implementation
• fix fiat balance sorting in address list window
• remove thousands separator when copying numbers to clipboard
• new: notes tab for saving text in the (encrypted) wallet file
• simplify welcome page for first-start network settings
• Trezor: allow multiple change outputs
• Trezor: support external pre-signed inputs
• new: swapserver plugin
• update bundled zbar, for security fixes
• localization: never translate CLI/RPC
• localization: simplify how default language is chosen
• also support unfinished wallets when opened through File>Open
• fix handler for OpenFileEventFilter
• fix crash during startup/wizard-open
• changed: label tx sizes as "vbytes", and feerates as "sat/vbyte"
• fix: wizard regression not able to use HWW as cosigner for new wallets
• fix: onchain invoice paid detection broken if jsonpatch enabled
• fix: program not starting because of bad "proxy" config value
• fix: wizard: don't log sensitive values: replace blacklist with whitelist
• new: basic "add server as bookmark" functionality
• fix: potential race condition in wizard page construction
• fix: don't use lightning invoice when user specifies MAX amount
• various UI fixes
• Trezor: support SLIP-19 ownership proofs, for trezor-based Standard_Wallets
• Trezor: fix regression in sign_transaction for trezor one for multisig
• Trezor: fix allow adding SLIP-19 ownership proofs to complete inputs
• Trezor: fix a race in swapserver when handling server-normal-swaps

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/v4.5.4/electrum-grs-4.5.4.dmg

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.5.4/electrum-grs-4.5.4-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.5.4/electrum-grs-4.5.4.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.5.4/electrum-grs-4.5.4-portable.exe
                                       
Download Linux installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.5.4/electrum-grs-4.5.4-x86_64.AppImage

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

Sparrow-GRS is a modern desktop Groestlcoin wallet application supporting most hardware wallets and built on common standards such as PSBT, with an emphasis on transparency and usability.

Sparrow-GRS does not hide information from you - on the contrary it attempts to provide as much detail as possible about your transactions and UTXOs, but in a way that is manageable and usable.
However, Sparrow-GRS is also unique in that it contains a fully featured transaction editor that also functions as a blockchain explorer. This feature not only allows editing of all of a transaction's fields, also easy inspection of the transaction bytes before broadcasting.

Changelog 1.7.9
• Add Taproot support on Groestlcoin Core using the new Cormorant library utilizing descriptor wallets (requires Groestlcoin Core v24 or later)
• Show a Lifehash for the wallet's master fingerprint in the Settings tab and Passphrase dialog
• Implement BIP329 for importing and exporting wallet labels (Wallet Import and Export dialogs)
• Add full support for Tapsigner as a hardware wallet (initialize, import, backup, change pin, message and transaction signing)
• Add support for sending to, sweeping and re-initialized a Satscard (Send tab Pay to dropdown and Tools > Sweep Private Key)
• Add support for entering empty passphrases on Trezor One
• Add support for private key sweeping using Groestlcoin Core with Cormorant (requires Groestlcoin Core v24 or later)
• Add https protocol to support Groestlcoin Core connections over TLS
• Add note on disabling derivation path validation to keystore help tooltip
• Avoid copying wallet history unnecessarily on wallet load
• Export 8 decimal places when exporting a CSV in GRS units
• Add config property autoSwitchProxy to disable automatic proxy switching on failure
• Improve Tor connection failure messages with help text
• Indicate in the SSL handshake warning that a certificate renewal may be the cause
• Prefer loading data for transaction tabs from existing wallet transactions
• Allow expired certificates for electrum-grs servers so long as they have been previously used or explicitly approved
• Write and parse both multipath and single descriptors in wallet output descriptor export
• Add transaction fee column to transactions CSV for outgoing (spending) transactions
• Improve display of JSON-RPC error exceptions
• Add block height to Terminal connected label
• Update menu categories for Linux desktop installation
• Improve legacy Groestlcoin Core wallet error messages
• Set initial focus to done button on Terminal server test dialog
• Avoid triggering all history changed event on unconfident script hash status calculations
• Update dependencies for guava, simple-json-rpc, junit and dependants
• Upgrade Gradle to 7.6 for Java 19 support
• Bug fix: Fix Sparrow-GRS export wallet file extension to be always .mv.db
• Bug fix: Fix cancelling Create Wallet in Terminal
• Bug fix: Allow message sign/verify from nested segwit wallets
• Bug fix: Fix edge case when loading wallets with matching tx inputs and outputs
• Bug fix: Fix persistence of renaming and deleting newly created wallet accounts
• Bug fix: Ensure focus remains on table after editing a label cell
• Bug fix: Add merge function for wallet transaction entry edge case
• Bug fix: Fix address context menu action Copy Output Script Bytes to return entire ScriptPubKey
• Bug fix: Disable server toggle when no server is configured (URL host is empty)
• Implement Bitcoin Secure Multisig Setup (BSMS) for keystore export and wallet import/export
• Configure a block explorer URL in General Preferences to enable opening a transaction in the browser
• Warn and request user confirmation before enabling use of a BIP39 passphrase
• Add output descriptor QR scanning from the Wallet Import dialog
• Improve UX of BIP39 wallet discovery on Groestlcoin Core
• Display UTF8 strings encoded into scripts in transaction viewer (displays OP_RETURN text)
• Recompile secp256k1 on MacOS 10.13.6 to support legacy hardware
• Show HWI signature verification errors
• Read and throw HWI error stream if stdout empty
• Use default ports for Groestlcoin Core if absent
• Avoid using zst compression on .deb packages
• Add minfeerate parameter to BIP78 payjoin URLs
• Support converting xprvs in output descriptors to xpubs
• Upgrade jlink plugin to support Java 19
• Add StartupWMClass to linux .desktop file to avoid temporary icon
• Switch groestlcoind client from named to array parameters to support grs-rpc-proxy with Cormorant
• Bug fix: Only use configured proxy when connecting to onion addresses with Cormorant
• Bug fix: Fix UX when changing the port for an aliased server
• Bug fix: Fix Taproot signature hashing for single|anyonecanpay sighash flags
• Bug fix: Add lock menu item to all wallets with a password on Terminal, not just hot wallets
• Bug fix: Fix keystore encryption issue when changing the password on a wallet with freshly added accounts
• Generate or load Border Wallets grids to enter memorizable seeds
• Update Tor to v0.4.7.13 using the kmp-tor library
• Darker dark theme and other styling improvements
• Signed Windows installer binary
• Autosuggest all possible words for the last word when entering a BIP39 seed
• Display a warning if the chosen mixFeeTarget fee rate is much lower than that of normal priority
• Change the wallet gap limit and subscribe to new addresses if an address beyond the gap limit range is requested
• Support saving a Tapsigner backup as binary file
• Show PSBT QRs more compactly (without non-witness-utxo entries) for all multisig segwit signing wallets
• Add context menu to amount cells to copy values
• Read name from ur:crypto-hdkey and set keystore label if present
• Bug fix: Fix issue configuring a block explorer with a port and path
• Bug fix: Handle empty (0 block only) chains in Cormorant
• Bug fix: Fix accidentally making keystore fields editable on loading of single account non-watchonly wallets
• Add Border Wallets number grid support
• Always show Tapsigner in airgapped import options
• Improve error message when Groestlcoin Core wallet support is disabled
• Bug fix: Preserve the order of cell selection in a Border Wallets grid
• Show a warning if a Border Wallets entropy grid PDF is not saved
• Bug fix: Fixes an issue creating a seed after loading or regenerating a Border Wallets entropy grid with a cell selection already present
• Improve the mempool fee rates chart to reflect finer granularity and offer an expanded display on click
• Add a 24h toggle to expanded mempool fee rates chart
• Add additional inputs to an RBF transaction if needed as required fee is increased
• Display the order of word selection on a Border Wallets grid
• Avoid simultaneous multiple selection on a Border Wallets grid
• Clarify recovery phrase purpose on Border Wallets PDF
• Support spendable property on UTXOs in BIP329 wallet label imports and exports
• Improve the error message when broadcasting an RBF transaction with insufficient fee, and indicate the minimum required fee if available
• Improve error message on broadcasting a transaction with a fee rate below the purge rate for the connected node mempool
• Add Ctrl/Cmd+B keyboard shortcut for quickly switching the groestlcoin unit from GRS to gros and back
• When scanning, invert cropped frame and scan for inverted QRs
• Support scanning text QR containing seed words
• Update to hummingbird v1.6.7 to support pair (<0;1>) path components and unique part progress indicator
• Support compact SeedQRs with high error correction
• Trim leading and trailing whitespace from Pay to address field in the Send tab
• Look for supported cards across all connected card terminals
• Support airgapped keystore import of a Tapsigner with a custom derivation path
• Add a separate button to backup Tapsigner without changing the PIN
• Ensure canonical ordering of key expressions in multisig descriptor QRs
• Improve performance on large wallets with high address reuse
• Optimize fetching mempool entries for fee rate histogram when connected to Groestlcoin Core
• Continue with transaction parsing if pushdata opcode is found with invalid data length
• Add context menu options to Date column in UTXOs table to freeze UTXO and view transaction
• Remove path from non-batched Electrum-GRS server request ids
• Highlight CSV download buttons
• Update kmp-tor to v1.4.3
• Bug fix: Set all witness UTXOs on PSBT inputs before attempting to sign a sweep private key Taproot transaction
• Bug fix: Fix reading of compact size int as unsigned short when parsing PSBTs
• Bug fix: Fix unit format switching on Send tab
• Bug fix: Fix UI button update when stopping mixing on Terminal
• Add BIP322 message signing for singlesig addresses including P2TR
• Add zbar QR reader for all QR scans (wide, cropped and inverted)
• Add useZbar config variable to disable zbar scanning (enabled by default)
• Add Rename Wallet command to File menu
• Set initial fee for proposed RBF transaction to satisfy minimum relay requirements
• When constructing RBF and CPFP transactions, add any additional UTXOs by output group only if effective fee is sufficient
• Make the Send to Many dialog non-modal, where reselecting the menu command brings an existing dialog to the foreground
• Show a warning in the General Preferences if currencies could not be retrieved from the exchange rate source
• Optimize memory store used for calculating the fee rate histogram in Cormorant
• For memory efficiency, only keep older mempool histogram entries at ten minute intervals
• Add additional UTXOs to CPFP transaction if the output value is below the dust threshold
• Set the transaction label to a comma separated list of the payment labels when a multiple payment transaction is broadcasted
• Show a warning dialog on Submit Bug Report to redirect users to the support channel where appropriate
• Add the Taproot script type to connected wallet import options
• Add a tooltip to the Save Final Transaction button to suggest connecting to a server in order to broadcast
• Make alert dialogs resizable
• Bug fix: Fix overselection of inputs during RBF
• Bug fix: Preserve payment labels when using RBF on multiple payment transactions
• Bug fix: Retain UTXO frozen status on wallet refresh
• Bug fix: Preserve wallet order on application restart after tabs are moved left or right
• Bug fix: On updating UTXO history in Terminal, set the scrollbar to the top if the table view is scrolled below new UTXO table row count
• Add wallet accounts summary dialog (View menu)
• Support import and export of keystore labels in descriptor (ur:crypto-output) QR codes
• Propagate transaction label changes to inputs, outputs and addresses where their existing labels were set in the same manner
• Suggest clearing any existing keystores when the script type is changed in the Settings tab
• Avoid adding inputs when constructing a consolidation transaction replacement, allowing output to decrease
• Add mempoolFullRbf config variable to enable RBF functionality on mempool transactions without checking sequence flags (default false)
• Refactor transaction and UTXO table column sorting, add default sorting on new history if table was previously empty
• Add tooltip to account tab where label is truncated
• Bug fix: In Terminal, check if theme is present to avoid exception on UTXO history update
• Bug fix: Support CompactSeedQR scanning using zbar
• Bug fix: Fix single character multisig threshold parsing issue
• Bug fix: Handle Groestlcoin Core bug where listwalletdir returns empty results even when wallets are loaded
• Bug fix: Use ControlPort auto instead of UNIX socket for internal Tor control to avoid a bug where UNIX socket path is too long

Features
• Full support for single sig and multisig wallets on common script types
• Connect to public Electrum-GRS servers
• Standards based including full PSBT support
• Support for KeepKey
• Support for Ledger Nano S
• Support for Ledger Nano X
• Support for Trezor Model T
• Support for Trezor One
• Full coin and fee control with comprehensive coin selection
• Labeling of all transactions, inputs and outputs
• Lightweight and multi platform
• Payjoin support
• Built in Tor
• Testnet, regtest and signet support

This application is licensed under Apache. 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/sparrow-grs/releases/download/v1.7.9/Sparrow-GRS-1.7.9-x86_64.dmg
Download Windows installer here: https://github.com/Groestlcoin/sparrow-grs/releases/download/v1.7.9/Sparrow-GRS-1.7.9.exe
Download Linux (Ubuntu/Debian) installer here: https://github.com/Groestlcoin/sparrow-grs/releases/download/v1.7.9/sparrow-grs_1.7.9-1_amd64.deb
Download Linux (Redhat/CentOS) installer here: https://github.com/Groestlcoin/sparrow-grs/releases/download/v1.7.9/sparrow-grs-1.7.9-1.x86_64.rpm

Source code: https://github.com/Groestlcoin/sparrow-grs/

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 10.07
• Target Android 14

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 10.07
• Target Android 14

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

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 v1.11.7
• Reporting: Add payouts
• Wallet: Delete custom labels
• Dashboard: Show revenue data for keypad
• Dashboard: Show the number of paid invoices in the last 7 days
• Login: Add Remember Me button
• Archive stores and apps
• New permission: Can archive pull payment
• Pull Payment: Show QR code for LNURL-Withdraw
• Pull Payment: Add QR scanner for destination and infer payment method

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 v1.11.7
• Reporting: Add payouts
• Wallet: Delete custom labels
• Dashboard: Show revenue data for keypad
• Dashboard: Show the number of paid invoices in the last 7 days
• Login: Add Remember Me button
• Archive stores and apps
• New permission: Can archive pull payment
• Pull Payment: Show QR code for LNURL-Withdraw
• Pull Payment: Add QR scanner for destination and infer payment method

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

Core lightning: A specification compliant Lightning Network implementation in C

Core lightning is a lightweight, highly customizable and standard compliant implementation of the Lightning Network protocol.
Core lightning only works on Linux and Mac OS, and requires a locally (or remotely) running groestlcoind (version 22.0 or above) that is fully caught up with the network you're testing on.

Changelog 23.11
• Wumbology for all! The configuration option large-channels is now set by default.
• The dual-funding process stores the state when sending commitment_signed now. This allows to continue the funding process after a temporary connection loss.
• A new flag --commit-fee-offset allows to set an offset that can potentially reduce disagreements on feerate updates.
• Plugins can now allow even unknown messages by registration and also are allowed sending them.
• Some stability improvements and bugfixes regarding splices.
• A whole lot of cleanups to stay on track with small specification changes. This adds additional stability and reduces disconnects.
• The check command just got more powerful. Instead of only checking the parameters of a command, it will do all checks up to the point where something in the system would need to be altered now.
• Control all the runes! Runes got an additional restriction field per for even more powerful access control. This also comes with a new field last_used for the showrunes command.
• Users can now verify the validity of their existing emergency backups using the decode command.
• When the new config option invoices-onchain-fallback is set, Core-Lightning automatically adds a taproot fallback address to all invoices produced by invoice. This allows for onchain payments as a fallback mechanism.

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.

Ubuntu: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-ubuntu
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
OSX: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-macos
Arch Linux: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-build-on-arch-linux
Raspberry Pi: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-cross-compile-for-raspberry-pi
Armbian: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-compile-for-armbian
Alpine: https://github.com/Groestlcoin/lightning/blob/master/doc/INSTALL.md#to-compile-for-alpine

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

[What's new in version v26.0?This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v26.0 but with Groestlcoin specific patches.]

A new major Groestlcoin Core version 26.0 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.

v26.0 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 v26.0?
This is a major release of Groestlcoin Core, featuring the technical equivalent of Bitcoin Core v26.0 but with Groestlcoin specific patches.

Changelog 26.0:
https://github.com/Groestlcoin/groestlcoin/blob/26.0.0/doc/release-notes.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, v22.0.0, v23.0.0, v24.0.1 and v25.0.0 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/v26.0/groestlcoin-26.0-win64-setup.exe
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-win64.zip

Download the OSX Intel based Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-x86_64-apple-darwin.zip
Download the OSX Intel based binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-x86_64-apple-darwin.tar.gz
Download the OSX ARM Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-arm64-apple-darwin.zip
Download the OSX ARM binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-arm64-apple-darwin.tar.gz

Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-x86_64-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-arm-linux-gnueabihf.tar.gz
Download the RISC-V Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-riscv64-linux-gnu.tar.gz
Download PowerPC linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-powerpc64-linux-gnu.tar.gz
Download PowerPC LE linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v26.0/groestlcoin-26.0-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

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

GRS RPC Explorer signet is a simple, self-hosted explorer for the Groestlcoin signet blockchain, driven by RPC calls to your own Groestlcoin signet 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 3.4.0
• Breaking changes to the API
• Minor fixes for running against Groestlcoin Core v23
• Block Analysis: include top "days destroyed" transactions
• URL change: /mining-template -> /next-block (redirect is included for compatibility)
• On Extended PubKey pages, include balance data for various address (if Electrum-GRS server is configured)
• Several new API actions/changes
• New /holidays, a curated list of Groestlcoin 'Holidays'
• Support for different view options on /fun
• On /difficulty-history, make delta graph honor timespan filtering
• Proper use of production-ready MemoryStore for session data
• Support for serving static assets via a configurable CDN
• Misc fixes for erroneous data display on non-mainnet nodes
• Switch from fontawesome to bootstrap-icons v1.8.0
• Refreshed "Dark" theme with blues toned down (legacy dark theme still available)
• UI/UX tweaks
• Misc minor fixes
• Updated dependencies

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

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

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

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 3.4.0
• Breaking changes to the API
• Minor fixes for running against Groestlcoin Core v23
• Block Analysis: include top "days destroyed" transactions
• URL change: /mining-template -> /next-block (redirect is included for compatibility)
• On Extended PubKey pages, include balance data for various address (if Electrum-GRS server is configured)
• Several new API actions/changes
• New /holidays, a curated list of Groestlcoin 'Holidays'
• Support for different view options on /fun
• On /difficulty-history, make delta graph honor timespan filtering
• Proper use of production-ready MemoryStore for session data
• Support for serving static assets via a configurable CDN
• Misc fixes for erroneous data display on non-mainnet nodes
• Switch from fontawesome to bootstrap-icons v1.8.0
• Refreshed "Dark" theme with blues toned down (legacy dark theme still available)
• UI/UX tweaks
• Misc minor fixes
• Updated dependencies

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 3.4.0
• Breaking changes to the API
• Minor fixes for running against Groestlcoin Core v23
• Block Analysis: include top "days destroyed" transactions
• URL change: /mining-template -> /next-block (redirect is included for compatibility)
• On Extended PubKey pages, include balance data for various address (if Electrum-GRS server is configured)
• Several new API actions/changes
• New /holidays, a curated list of Groestlcoin 'Holidays'
• Support for different view options on /fun
• On /difficulty-history, make delta graph honor timespan filtering
• Proper use of production-ready MemoryStore for session data
• Support for serving static assets via a configurable CDN
• Misc fixes for erroneous data display on non-mainnet nodes
• Switch from fontawesome to bootstrap-icons v1.8.0
• Refreshed "Dark" theme with blues toned down (legacy dark theme still available)
• UI/UX tweaks
• Misc minor fixes
• Updated dependencies

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

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 10.03
• Fix an issue with direct bluetooth payments.
• Request permission for connecting and listening to bluetooth sockets on Android 12 and above.
• Fix long-standing race when emptying wallet.
• Important bugfix for inputting fiat amounts.
• Important bugfix for version alerts.
• The app language can be selected independent of the system language on Android 13 and above.
• On Android 13 and above, the user is asked for notification permission when the time feels right.

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 10.03
• Fix an issue with direct bluetooth payments.
• Request permission for connecting and listening to bluetooth sockets on Android 12 and above.
• Fix long-standing race when emptying wallet.
• Important bugfix for inputting fiat amounts.
• Important bugfix for version alerts.
• The app language can be selected independent of the system language on Android 13 and above.
• On Android 13 and above, the user is asked for notification permission when the time feels right.

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

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 v1.11.4
• Complete overhaul of Invoice Reporting
• POS Cart redesign
• Add product categories to POS apps
• Checkout v2: Play sound when invoice is paid
• Add support for ExchangeRateHost and FreeCurrencyRates rate providers
• Display wallet balance in default currency in the on-chain wallet navigation

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