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

[gartmah]

Gift cards from Groestlcoin have become available for residents of Ukraine for mutual settlements, payments for mobile operators and storage

https://www.groestlcoin.org/polispay-wallet/

[waya]

Hello All,

I would like to ask that Unnamed Exchange, https://www.unnamed.exchange/, be considered for listing Groestl Coin.  This exchange has many features desirable for listing and is relatively inexpensive at only 0.05 BTC.

Cheers,
Waya

[umityesil]

Grs Coin Analysis, Grs Chart 2020

https://bitcoinheat.com/2020/11/12/grs-coin-analysis-grs-coin-price-grs-chart-2020-groestl-value-groestlcoin-news/

[IMZ Noo Account]

https://stealthex.io/

Nina from StealthEX has asked me to post the new logo on our sites. I have trialled StealthEX, and liked it. Please feel free to review it yourself, and post the review here.

[gruve_p]

A new major Groestlcoin Core version 2.21.0 is now available for download bringing both new features, various bugfixes and performance improvements, so it is recommended to upgrade to it if you are running a full Groestlcoin node or a local Groestlcoin Core wallet.

v2.21.0 is now the official release version of Groestlcoin Core. On top of the new features, various bugfixes, updated translations and performance improvements. It is recommended to upgrade to this version as soon as possible.

Pool operators, P2Pool and solo miners especially because by default, Groestlcoin Core automatically set and unsets version bits as required.
The deployment sets the block version number to 0x20000004 between midnight 15th Dec 2020 and midnight 31th Dec 2021 to signal readiness for deployment. The version number consists of 0x20000000 to indicate version bits together with setting bit 2, shown as "taproot" in the "getblockchaininfo" RPC call. Please note it will keep generating blocks with version 0x20000004 until "taproot" is activated at which point is will automatically unset bit 2.

Taproot Upgrade Information
The taproot soft fork is fully backwards compatible with all Groestlcoin wallets, so you will continue to be able to safely send and receive groestlcoins whether or not taproot is activated.

Taproot softfork mainnet timeline:
• Signal: Miners will be able to signal that they are willing and able to enforce taproot starting at the beginning of the first 2016 block retarget period on or after 15 December 2020 (UTC). In short signalling started on block 3382848.
• Lock-in: Once 95% of blocks in a 2016 block long period have signaled that their miners are ready to enforce taproot then taproot will lock-in – meaning that unless the blockchain is rolled back at that point, taproot will become active.
• Activate: After another 2016 block period, taproot will activate, allowing miners to produce blocks containing taproot transactions on Groestlcoin’s mainnet. When taproot is activated, transaction-producing software will be able to enforce a new SegWit version 1 output type, with spending rules based on Taproot, Schnorr signatures, and Merkle branches.

Taproot softfork testnet timeline:
• Signal: Miners will be able to signal that they are willing and able to enforce taproot starting at the beginning of the first 2016 block retarget period on or after 15 December 2020 (UTC). In short signalling started on block 1929312.
• Lock-in: Once 75% of blocks in a 2016 block long period have signaled that their miners are ready to enforce taproot then taproot will lock-in – meaning that unless the blockchain is rolled back at that point, taproot will become active. In short Lock-in was on block 1931328.
• Activate: After another 2016 block period, taproot will activate, allowing miners to produce blocks containing taproot transactions on Groestlcoin’s testnet. In short Activate was on block 1933344. When taproot is activated, transaction-producing software will be able to enforce a new SegWit version 1 output type, with spending rules based on Taproot, Schnorr signatures, and Merkle branches.

What's new in version v2.21.0?
This is a major release of Groestlcoin Core with many protocol level improvements and code optimizations, featuring the technical equivalent of Bitcoin Core v0.21.0 but with Groestlcoin specific patches. On a general level, most of what is new is the second version bits BIP9 softfork deployment, the Schnorr Signatures for secp256k1, Taproot: SegWit version 1 spending rules and Validation of Taproot Scripts.

Changelog:
https://github.com/Groestlcoin/groestlcoin/blob/2.21.0/doc/release-notes/release-notes-2.21.0.md

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

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

WARNING:
While this branch has been extensively tested to be compatible with the existing Groestlcoin v2.11.0, v2.13.3, v2.16.0, v2.16.3, v2.17.2, v2.18.2, v2.19.1 and v2.21.0 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/v2.21.0/groestlcoin-2.21.0-win64-setup-unsigned.exe
Download the Windows binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-win64.zip

Download the OSX Installer here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-osx-unsigned.dmg
Download the OSX binaries here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-osx64.tar.gz

Download the Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-x86_64-linux-gnu.tar.gz
Download the ARM Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-aarch64-linux-gnu.tar.gz
Download the ARM Linux binaries (32 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-arm-linux-gnueabihf.tar.gz
Download the RISC-V Linux binaries (64 bit) here: https://github.com/Groestlcoin/groestlcoin/releases/download/v2.21.0/groestlcoin-2.21.0-riscv64-linux-gnu.tar.gz
Linux Snapcraft: https://snapcraft.io/groestlcoin-core
Linux Flathub: https://flathub.org/apps/details/org.groestlcoin.groestlcoin-qt
Linux Launchpad: https://launchpad.net/~groestlcoin/+archive/ubuntu/groestlcoin

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

[gruve_p]

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 Elecrum-GRS is the right choice for you.

Changelog Electrum-GRS 4.0.7
• PSBT: restore compatibility with Groestlcoin Core following CVE-2020-14199: we now allow a PSBT input to have both UTXO and WITNESS_UTXO. (PSBTs created since 4.0.2 already contained UTXO for segwit inputs).
• Hardware wallets: run all device communication on a dedicated thread.
• New feature: "Automated BIP39 recovery". When restoring from a BIP39 seed, add option to scan many known derivation paths for history, and show them to user to choose from.
• Show derivation path of keystores in Qt GUI Wallet>Information.
• Fix "signtransaction" RPC command.
• The tar.gz source dist now bundles make_libsecp256k1.sh, to help users getting libsecp256k1.
• New feature: "Cancel tx". The Qt/kivy GUI allows cancelling an unconfirmed RBF tx by double-spending its inputs to self.
• Windows binary:
   - fix some issues with QR scanning by building zbar ourselves.
   - when using setup exe, also install a debug binary.
• Fix .dmg binary hanging on recently released macOS 11 Big Sur.
• Lightning:
   - bugfix: during LN channel opening, if the client crashed at the wrong moment, the channel might not get fully persisted to disk, and would need manual console-tinkering to recover.
   - Lightning is enabled by default. Electrum-GRS will not connect to the Lightning Network until the user opens a channel.
   - smarter node recommendation (to open channels with).
• Fix 'Max' button issue for submarine swaps button.
• Fix 'Max' button in kivy.
• Various fixes for Kivy/Android install wizard.
• Kivy: fix open channel with 'max' amount.
• Dependencies (as part of adapting to new dnspython):
   - pyaes is no longer needed.
   - python-ecdsa is no longer needed at all.
   - cryptography is now required (min 2.6), the user can no longer choose between cryptography and pycryptodomex.

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/v4.0.7/electrum-grs-4.0.7.dmg

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.7/electrum-grs-4.0.7-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.7/electrum-grs-4.0.7.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.7/electrum-grs-4.0.7-portable.exe
                                       
Download Linux installere here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.7/electrum-grs-4.0.7-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

[gruve_p]

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 Elecrum-GRS is the right choice for you.

Changelog Electrum-GRS 4.0.7
• PSBT: restore compatibility with Groestlcoin Core following CVE-2020-14199: we now allow a PSBT input to have both UTXO and WITNESS_UTXO. (PSBTs created since 4.0.2 already contained UTXO for segwit inputs).
• New feature: "Automated BIP39 recovery". When restoring from a BIP39 seed, add option to scan many known derivation paths for history, and show them to user to choose from.
• New feature: "Cancel tx". The Qt/kivy GUI allows cancelling an unconfirmed RBF tx by double-spending its inputs to self.
• Lightning:
   - bugfix: during LN channel opening, if the client crashed at the wrong moment, the channel might not get fully persisted to disk, and would need manual console-tinkering to recover.
   - Lightning is enabled by default. Electrum-GRS will not connect to the Lightning Network until the user opens a channel.
   - smarter node recommendation (to open channels with).
• Fix 'Max' button in kivy.
• Various fixes for Kivy/Android install wizard.
• Kivy: fix open channel with 'max' amount.
• Dependencies (as part of adapting to new dnspython):
   - pyaes is no longer needed.
   - python-ecdsa is no longer needed at all.
   - cryptography is now required (min 2.6), the user can no longer choose between cryptography and pycryptodomex.

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

[gruve_p]

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

C-lightning is a lighweight, 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 0.9.2
• The sending of multi-part payments has seen a lot of work, covering more corner cases and generally becoming much more robust.
• New official plugins create commands multiwithdraw and multifundchannel to easily produce a single transaction which does more than one thing; these use the PSBT plumbing created for v0.9.0.
• We produce far less log spam when log-level is set to debug, so if you've avoided setting that before, I recommend trying now.
• Startup checks that groestlcoind is the correct version, and relays transactions
• Builtin plugins are now nominated as important, and you can nominate others as important too. The daemon will stop if these fail.
• You can now build a postgres-only installation, without sqlite3.
• Our invoices now supply more than one routehint if we think you'll need to use multi-part-payments.
• We prune channels which are not updated in both directions every 2 weeks.
• Our default CTLV expiry has increased to 34 blocks, or 18 if we're the final node, as per updated specification recommendations (lightningnetwork/lightning-rfc#785)
• PSBT APIs fleshed out with utxopsbt and locktime arguments.
• Plugins can easily mark commands and options deprecated.
• The new channel_state_changed notification lets plugins easily track channel behavior.
• We now keep track of channel closure rationales. Wonder "why did my channel close" no more. All channel state changes are now listed in listpeers's state_changes.
• New CLI/RPC notifications: Tired of waiting for close to finish without getting any updates? With notifications, the close command will publish notifications (think CLI status updates) for slow closes. Must have allow-deprecated-apis set to false for these to work.
• New optional argument commitment_feerate on the multifundchannel command. This is useful for setting one feerate for the funding transaction and another for the channel commitment transactions.
• Two new commands added to hsmtool:
 - generatehsm allows you to create an HSM hsm_secret from a BIP39 pass phrase. (Note that due to c-lightning's current seed derivation process, wallet addresses aren't standard 'BIP39 to BIP32' compliant. Which is a fancy way of saying your pass phrase isn't portable to other, non-clightning wallets.)
 - dumponchaindescriptors will output the xpub for the HD wallet master key. This will let you track swept c-lightning wallet funds -- anchor outputs and unswept channel outputs won't be visible until swept.
• The starting feerate for mutual closes has been reduced to 'slow', to avoid overpayment.
• In-memory log buffer now is 10MB, down from 100MB.
• We no longer support receiving full gossip from ancient LND nodes
• Fixed re-transmission order of multiple new HTLCS. This was causing channel closures with LND.
• Plugin hook call ordering. Hooks can now specify that they must be called 'before' or 'after' other plugins.
• pyln-client will handle and send RPC command notifications.
• pyln-proto now includes a pure python implementation of the sphinx onion creation and processing.
• PostgresSQL key-value DSNs now supported.
• Plugin hook htlc_accepted can now return a custom failure_onion.

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

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

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

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

[gruve_p]

GroestlSeed: Secure your groestlcoin recovery seed.

Writing down your groestlcoin recovery seeds on plain paper might be solid electronic security, but terrible physical security. Not everyone has a safe they can keep stuff like that in. GroestlSeed encrypts your recovery seed with AES256 and encodes the encrypted data into a QR Code which you can print out and keep anywhere.
Why pay for solutions that still leave your seed in plain text when you can print out and laminate a business card with your encrypted recovery seed on it for free. You could keep a copy in your wallet, or in a safe, or even hide it in plain sight.
Your recovery seed is encrypted with the Cipher Block Chaining (CBC) mode of the Advanced Encryption Standard with a 256 bit key length. Your key is generated using a password of your choice and a random salt, hashed 1 million times with pbkdf2 (sha512). Encrypting the same data with the same key will yield a different result every time.

Features
• Encrypts your recovery seed with AES256
• Encodes the encrypted data into a QR Code

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.

Whenever you type anything on a computer connected to the internet, you run the inherent risk of your information being exposed by keyloggers, viruses, and other attack vectors. This risk can be mitigated by using an offline computer or by simply typing in your recovery phrase out of order and rearranging them with the mouse afterwards.

NOTE: If you forget your password, your seed is lost. There is no recovery.

Download Seed Savior here:
Ubuntu/Debian: https://github.com/Groestlcoin/cryptoseed/releases/download/v1.1.0/GroestlSeed_1.1.0_amd64.deb
Windows: https://github.com/Groestlcoin/cryptoseed/releases/download/v1.1.0/GroestlSeed.Setup.1.1.0.exe
OSX: https://github.com/Groestlcoin/cryptoseed/releases/download/v1.1.0/GroestlSeed-1.1.0-mac.zip

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

[gruve_p]

Emoji Seed: Mnemonic seed with emojis instead of words.

Tired of boring 12-word seeds? Use emoji instead! The same security in a funny form!
You can generate a private key and show it as a sequence of emojis. This sequence has a checksum (like in electrum-grs, derived from hash, not from the wordlist) and you can actually use these private and public keys in any wallet.
To detect typos we use a wordlist-independent electrum-grs checksum approach: Emoji seed generator creates sequences of random emojis and checks if their HMAC starts with "01" (electrum-grs standard seed). With this type of checksum even using a different list of emojis will lead to a valid seed, and if you've made a typo when entering the seed first two characters of the HMAC will be different from "01", so you will know that you made a typo.

Features
• Shows your seed hash
• Shows your master private key
• Shows your master public key
• Shows your master private key
• Shows the current emojis wordlist used

Live version available at https://groestlcoin.org/emoji-seed/ But it is recommended to download Emoji Seed offline and run it on your pc. Open index.html to get started.

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.

Note: Using emoji seed is experimental as there are plenty of similar emojis and they are platform-dependent.

Download Emoji Seed here: https://github.com/Groestlcoin/emoji-wallet/archive/master.zip

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

[gruve_p]

StegoSeed: Steganographically hide your groestlcoin wallet seeds.

This tool uses a Markov model of a text corpus to generate sentences which encode groestlcoin wallets by including BIP39 words in the text.

Features
• Hide your seed steganographically

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

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 StegoSeed here: https://github.com/Groestlcoin/stegoseed/archive/master.zip

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

[gruve_p]

GroestlDice: Generate groestlcoin BIP39 mnemonic words using dice.

Generate your own groestlcoin seed by using a dice

Features
• Checks if internet is connected

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.

Note: During the seed generation process, this machine should be completely offline. This tool is experimental.

Download GroestlDice here:
Linux: https://github.com/Groestlcoin/groestldice/releases/download/v0.1.1/groestldice-linux-x64.zip
Windows: https://github.com/Groestlcoin/groestldice/releases/download/v0.1.1/groestldice_0.1.1-win32-x64.zip
OSX: https://github.com/Groestlcoin/groestldice/releases/download/v0.1.1/groestldice_0.1.1-darwin-x64.zip

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

[gruve_p]

Seed guardian: Split and reconstruct your groestlcoin BIP39 Seed using Shamir's Secret Sharing Scheme.

This software shares your BIP39 12 words seed in 15 words shares. For example, if you share your seed in 3 shares with a threshold of 2, you need 2 shares to reconstruct your seed, so you could lose one share, and somebody finding one share can't reconstruct your seed.

Features
• Hexadecimal shares are humanized using BIP39 algorithm, so each share is encoded as a sequence of 15 words.
• Adjustable number of shares and threshold.

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

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.

Note: Only 12 words seed supported and should be BIP39 compatible.

Download Seed Guardian here: https://github.com/Groestlcoin/seedguardian/archive/master.zip

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

[gruve_p]

BIP39 Builder: A web tool for building custom BIP39 mnemonics.

This tool allows you to generate and customize BIP39 mnemonic seed phrases used for creating and/or recovering a Groestlcoin deterministic wallet.

Try it here: https://build-bip39.groestlcoin.org/bip39/

Features
• Choose between 24, 21, 18, 15, and 12 words
• Generate a complete random phrase at any time
• The button will use the browser's random number generator
• The text input will use the SHA-256 hash of whatever you type in (should be something random, or very long)
• Drop down interface for selecting and searching for individual words
• The list of valid last words will dynamically update as word selections are made
• Once all words are selected, a summary is shown which helps visualize the mapping between the data and words. The seed is also shown with an optional passphrase input, which can then be used with BIP32 for generating a deterministic wallet.

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

Note: Choosing your own mnemonic is less secure than using a randomly generated one. There is a greater chance an attacker can guess your phrase if it is not random. On the flip side, there is also a greater chance of remembering a custom phrase in case you lose your backups by accident. Overall, random is still better, but if you're willing to accept the tradeoffs, a custom mnemonic can be useful. It is another tool to have in the wide spectrum of security systems.

Source code: https://github.com/Groestlcoin/build-bip39

[jackielove4u]

Anybody knows how to contact the GRS mining pool with generation address 3E2p6qP9vh4hFfuVQLsxTAziRDDHJ5DnQj and inform them to upgrade to Groestlcoin Core 2.21.0 ?

[Dalib]

Groestlcoin (GRS) Gift cards available now in Venezuela!

Buy giftcards for Movistar Venezuela and more with your GRS !

Powered by PolisPay: https://www.groestlcoin.org/polispay-wallet/

[gruve_p]

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 Elecrum-GRS is the right choice for you.

Changelog Electrum-GRS 4.0.9
• fixes a regression introduced in 4.0.8, that prevents from paying BIP70 invoices
• reflect frozen channels and disconnected peers in the displayed 'can send/can receive' amounts.

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/v4.0.9/electrum-grs-4.0.9.dmg

Download Windows installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.9/electrum-grs-4.0.9-setup.exe
Download Windows standalone wallet here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.9/electrum-grs-4.0.9.exe
Download Windows portable version here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.9/electrum-grs-4.0.9-portable.exe
                                       
Download Linux installer here: https://github.com/Groestlcoin/electrum-grs/releases/download/v4.0.9/electrum-grs-4.0.9-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

[gruve_p]

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 Elecrum-GRS is the right choice for you.

Changelog Electrum-GRS 4.0.9
• fixes a regression introduced in 4.0.8, that prevents from paying BIP70 invoices
• reflect frozen channels and disconnected peers in the displayed 'can send/can receive' amounts.

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

[gruve_p]

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

C-lightning is a lighweight, 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 0.9.3
• Much improved parameter verification in lightning-cli makes it easier to debug why a call failed.
• You can now query for the status of an invoice based on the hash or the invoice.
• Plugins that are started while the node is running can now receive command line arguments as if they were provided at node startup.
• The security of the hsmtool used to encrypt and decrypt the node's seed key was improved by switching to a passphrase prompt instead of a command line argument.
• Multiple plugins can now register for the db_write hook, which means you can now run multiple backup plugins at the same time. In addition we wrote extensive documentation on how to secure your node from dataloss.
• No more reckless: the default network changed from testnet to groestlcoin.
• We have experimental support for the onion messages proposal, allowing arbitrary messages to be exchanged between nodes in the network.
• We have experimental support for the offers proposal, enabling reusable invoices, refunds, invoices denominated in currencies other than groestlcoins, and much much more. If you ever wanted to have an inline communication step with the other endpoint of a payment then take a look at this.
• pyln now supports both receiving notifications from the RPC interface, as well as sending notifications in methods implemented by plugins. No more waiting in front of a blank screen for your users.
• The new createinvoice allows you to create an invoice externally, then have your node sign it and manage it internally.
• You can use sendonionmessage to send an onion routed message, which recipient can receive using a plugin that register for the onion_message or onion_message_blinded hook.

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

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

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

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

[gruve_p]

GRS is a fast, easy, sexy wallet. Sticking to our core philosophy we neither hold nor have access to users' Groestlcoins.

GRS is a real standalone Groestlcoin client. There is no server to get hacked or go down, so you can always access your money. Using SPV mode, GRS connects directly to the Groestlcoin network with the fast performance you need on a mobile device.
GRS is designed to protect you from malware, browser security holes, even physical theft. With AES hardware encryption, app sandboxing, and verified boot, GRS represents a significant security advance over web and desktop wallets.
Simplicity is GRS's core design principle. A simple backup phrase is all you need to restore your wallet on another device if yours is ever lost or broken. Because GRS is deterministic, your balance and transaction history can be recovered from just your backup phrase.

Features
• Simplified payment verification for fast mobile performance
• No server to get hacked or go down
• Single backup phrase that works forever
• Private keys never leave your device
• Import password protected paper wallets
• Payment protocol payee identity certification

WARNING
Installation on rooted devices is strongly discouraged

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

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

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