Is RNDR on Ethereum or Solana?

Could you please clarify for me which blockchain network does RNDR operate on? Is it Ethereum, Solana, or perhaps another platform entirely? I'm trying to understand the technological foundation of this cryptocurrency and how it fits into the broader ecosystem. Your expertise in this area would be invaluable to my understanding. Could you possibly elaborate on the advantages or disadvantages of RNDR's choice of blockchain, if known? Thank you in advance for your time and assistance.