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 v2.20.1?
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 v2.20.1 network there is the possibility that we missed something. ALWAYS BACKUP YOUR GROESTLCOIN WALLET BEFORE UPGRADING.

How to Upgrade?
Windows: If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer.
OSX: If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), run the dmg and drag Groestlcoin Core to Applications.

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