Is immutable built on Ethereum?

Could you please clarify whether Immutable is indeed constructed upon the Ethereum blockchain? This question is prompted by my curiosity about the technological foundation of this emerging platform. Ethereum, as we know, is a highly regarded blockchain network that has fostered the growth of numerous decentralized applications and smart contracts. Given its scalability, security, and extensive community support, it seems to be a logical choice for such a groundbreaking project as Immutable. However, without confirmation from reliable sources, I hesitate to draw any firm conclusions. Could you enlighten me on this matter? It would greatly assist my understanding of the technological landscape within the cryptocurrency and finance sphere.