Dune and Yuma are both temporary testing environments for Horizen EON.
Since the successful launch of the permanent testnet Gobi, both Dune and Yuma testnets will be deprecated. Dune and Yuma will no longer receive any upgrades or support. Both environments will be removed at a later time after the EON mainnet launch.
If you have deployed smart contracts on Dune or Yuma, please be sure to migrate (redeploy) your projects to Gobi for testing.
Thank you again for supporting and testing Dune and Yuma! Join #eon or #dev-chat on Discord if you have any questions about this deprecation.