The Register Action

The whole point of CATalog

Note: The register action code be found here.

The register action, as the name suggest, registers a new CATalog entry. This requires a precommitment coin that contains the TAIL hash, the initial NFT owner puzzle hash, as well as refund-related information (CAT maker and CAT maker solution) to be created before.

When the action is run, it:

• Creates a slot that represents the CAT. This prevents future registrations from registering the same TAIL hash.

• Spends the slots representing the new slot's neighbors to assert that they exist, and updates their neighbors so the new structure is: left neighbor <-> new slot <-> right neighbor

• Creates a uniqueness prelauncher for the CAT NFT, whose puzzle contains the TAIL hash. The prelauncher puzzle hash and parent can be used in the future to assert that a given NFT represents a particular CAT asset id (TAIL hash/CATalog entry).

• Consumes the precommitment coin

• Asserts the CAT NFT was correctly created (i.e., it was created to the specified owner)

The action also creates a puzzle announcement. This announcement can be asserted to ensure the dApp singleton is running the right action with the right parameters. For the register action, the announcement prefix, 'r' , is concatenated to (sha256tree (tail_hash . initial_nft_owner_ph)).

Written by yakuhito from FireAcademy.io on Feb 14th, 2025.