So you have spare GPU power and would like to help secure the Eth Classic network ?
Well the easiest way you can support Eth Classic projects is by downloading and installing Hyperledger .
Hyperledger Besu is an Ethereum based client designed to be enterprise friendly for both public and private ran network use cases. It can also be ran on test networks such as Rinkeby, Ropsten, and Görli. Hyperledger Besu includes several consensus algorithms including PoW, and PoA (IBFT, IBFT 2.0, Etherhash, and Clique. Hyperledger Besu refers to the ability to keep transactions private between the involved parties. Other parties cannot access the transaction content, sending party, or list of participating parties in any way.
Besu includes a command line interface and JSON-RPC API for running, maintaining, debugging, and monitoring nodes in an Ethereum network. You can use the API via RPC over HTTP or via WebSockets. Besu also supports Pub/Sub. The API supports other more typical Ethereum functionalities like Ether mining ,developing smart contracts and the development of decentralized applications aka Dapps .development.
Hyperledger offers free introductory training courses in partnership with The Linux Foundation and edX.org .