Can you tell us any clouds or co-location sites where nodes might currently be operating?

The network team and early validators have set up nodes on Digital Ocean and Vultr but nodes can also run on bare metal provided they meet the requirements specified above. The choice is largely up to the validator although the network team can suggest and assist with provisioning options. The SKALE network team maintains a list of Intel SGX-compatible servers. Additional inquiries can be addressed in the SKALE validator Discord.