August 1, 2023

Testnet Node Software Upgrade: ZEN 4.1.0-rc1 is Available to Download

The new version ZEN 4.1.0-rc1 is available to download on GitHub and via Docker.

4.1.0-rc1 is a Testnet pre-release candidate in anticipation of the release of ZEN 4.1.0 to Mainnet later this September.
Pre-release 4.1.0-rc1 will perform network upgrade on Public Testnet via Hard Fork at block #1313400 which will occur August 8th, 2023 at approximately 10:00 UTC.
- Related to ZenIP-42204 to remove shielded transactions with transparent inputs from the Horizen Mainchain
  - Shielding of coinbase transactions will not be possible anymore once the hard fork activates.
  - Coinbase Transactions continue to mature after 100 confirmations of blocks.
- The Community Fund, Secure Node and Super Node addresses will be rotated with this Hard Fork.
Only nodes running on Public Testnet have to be updated.
An update of s-nomp for mining pools using it will be required for compatibility with 4.1.0-rc1.
- requireShielding in the coin configuration will have to be set to false once the Hard Fork activates
- Coinbase reward addresses for Community Fund, Secure Node and Super Node will change with the Hard Fork
If you are not using s-nomp as your mining pool software please refer to this example pull request for the required changes
Updated wallets incorporating changes for compatibility will be provided with the Mainnet release in September.

Shielded Pool Deprecation	ZenIP-42204
Mempool Limit	Security restriction to avoid abnormal mempool growth. Added strict limit to the size of the mempool Default: 400 MB
P2P Alert System Removal	Deprecated due to non-usage
P2PK	Index Pay 2 Public Key Transactions in Explorer. Restart Zend with -reindexfast to include P2PK transactions in the explorer index.
HorizenDAO	Was approved and merged the ZenIP-42203 proposed late in December, to further decentralize the Horizen ecosystem via the upcoming launch of a DAO. This will give the community more involvement in ecosystem governance.
Community Fund Addresses Rotation	The Community Fund, Secure Node and Super Node addresses will be rotated with the Hard Fork.

Please let us know if you have any questions or you need further support by reaching out to us on our Discord.