What blockchain is the Great Expectations collection on?

Great Expectations is minted on the Palm blockchain, a new & more energy efficient token-powered ecosystem for NFTs connected to Ethereum. 

You are able to use your Great Expectations 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 our verified OpenSea collection here