Unlockable NFTs is a feature already present on other NFT marketplaces, and WG 2.1 explored the feasibility of bringing this to HEN, where collectors can access additional content upon purchasing an NFT.
In addition, the group conducted a poll on Twitter with the results showing that the community would prefer to see unlockable content in both additional markdown (like a link or poem) or as an additional NFT.
Unfortunately, the working group was unable to proceed further due to a lack of experienced developers, and members of the WG eventually merged with WG 5.4 to provide design mockups.