GoldCoin GLD: Hard Fork
"Goldcoin changes different consensus rules than Bitcoin Cash did, but it will fork from Bitcoin in the same manner - by enforcing new consensus rules as of a predetermined BTC block height. The new rules will come into effect on June 17th, 2019. At this time, exchanges will be asked to pause trading to allow them time to upgrade."
The cryptocurrency mainnet operates according to certain rules. To improve network performance or correct errors, it is periodically made changes. A hard fork is changes that are not compatible with previous versions of programs that support the cryptocurrency network and in order to continue to mine cryptocurrency, miners need to update the software.
In some situations, as a result of a hard fork, a completely new cryptocurrency may appear, as happened with Bitcoin Cash.