On December 19th, Metaplex, an NFT platform on Solana, announced the release of a new standard for full-chain and immutable digital assets on Solana called Metaplex Inscriptions and Engravings. Metaplex Inscriptions allows users to fully store the metadata and media of their assets on Solana, eliminating any external assumptions and enabling composability of on-chain attributes and smart contracts. Metaplex Engravings enables the use of immutable NFTs with engravings on Solana. Regardless of whether the original program is immutable, Engraver adds an extra layer of security to prevent any changes to the Engraved NFT. Both of these programs have been sent to the development network, and users can mint new NFTs and convert existing ones. The engravings will be numbered on a first-come, first-served basis.