Can I sell my NFT on OpenSea?

HENI NFT's such as The Currency and The Empress were minted on the Palm blockchain, which is a new & more energy efficient token-powered ecosystem that has a two-way bridge to Ethereum. 

You are able to use your NFT on Ethereum by using Palm's two-way bridge to Ethereum, which can be found here

NFTs that have been moved across Palm's two-way bridge to Ethereum can be found on OpenSea