What chain is Audius on?

Could you please clarify which blockchain network Audius is currently operating on? As a cryptocurrency and finance practitioner, I understand that the choice of blockchain can have significant implications for a project's scalability, security, and overall performance. Is Audius utilizing a popular blockchain like Ethereum or Binance Smart Chain, or is it utilizing a lesser-known or proprietary blockchain? Additionally, is there any information on Audius's plans for potential migration to a different blockchain in the future?