Crown v0.14.0.1 "Emerald" Release Notes

Crown Core v0.14.0.1 is a patch to the major v0.14.0 release and a non-mandatory upgrade. But mandatory for those who want to use the NFT Framework. It is available for download from:

https://www.crownplatform.com/wallet/

ALL nodes and wallets MUST upgrade before 06:00 UTC on 24 March 2020 or they will be cut off from the network. Any node rewards earned, or transactions initiated by previous version clients after that time will NOT be valid on the v0.14 network.

Users will have approximately two full weeks, including two weekends to upgrade their nodes and wallets.

The cutoff will be enforced by a protocol version upgrade which means masternodes and systemnodes must be restarted after upgrading them and the controlling wallet.

Please report bugs through the Help, Guides and Support board at the Crown forum

How to upgrade

The basic procedure is to shutdown your existing version, replace the executable with the new version, and restart. This is true for wallets, masternodes and systemnodes. The exact procedure depends on how you setup the wallet and/or node in the first place. If you use a managed hosting service for your node(s) it is possible they will upgrade them for you, but you will need to upgrade your wallet.

You are recommended to upgrade the controlling wallet before upgrading any nodes in order to minimise the node downtime. The protocol version is changed in this release so you must issue a start command from the upgraded controlling wallet for any masternode or systemnode after upgrading the node.

When a large number of nodes concurrently go offline and come online again it can cause network instability. If you are a node operator or individual with a large number of nodes we ask you to upgrade them sequentially if possible, or in small batches of no more than five at a time, to reduce the risk of destabilising the chain.

What's new

NFT framework

Crown Core v0.14 "Emerald" is the mainnet release of the non-fungible token (NFT) framework. There is no change to the consensus rules, superblock interval or node rewards. There are two new RPCs to register and query NFT protocols and tokens, turning the Crown blockchain into an assetchain. NFT functionality will be activated at 10:00 UTC on 24 March 2020, shortly after all old version nodes have been disconnected from the network.

• nftproto registers and queries NFT protocols.
• nftoken registers and queries individual non-fungible tokens.

More documentation is available at NFT framework part 2 and NFT Framework part 1

Other notable changes

• A testnet version of the installation/update script, crown-server-install.sh which simplifies setting up a bare testnet wallet or node.
• Some enhancements to the spendfrom.py script which simplify consolidating MN/SN rewards or other cases of multiple transactions sent to a single address.
• sandbox.py environment creation and management script for testing independent of the public testnet.
• Updated references to Crown Platform home URL wherever it is used.
• Updated mainnet seednodes.