Dynamic Metadata

[jacobarluck]

Allow a designated address to append new metadata to enable dynamic NFT metadata

Example:

• Display a new opt-in visual layer inside of a marketplace or wallet UI on top of the original image of the NFT

[michaeljklein]

My design is to use one-step batch permits to implement cosigning:

• User submits pair id user_param, authenticated to them and stored at the top level
• Admin submits pair id admin_param, authenticated to them
• If the id's match, the (id, user_param, admin_param) triple represents a parameter cosigned by both the user and the admin

See here for further notes on this design pattern.

LIGO module design

An extension of the Permit module

Storage

• Permit storage
• current_user_param : option (pair (nat %current_id) (bytes %current_user_param))
• A method log_param : (id : nat, user_param : bytes, admin_param : bytes)
  • Likely to be storing an option (bytes, bytes) field in metadata ledger
  • Will need to map nat and the contents of the user_param : bytes to whatever metadata key is used (potentially using TZIP-16 methods)

Functions

• user_cosign : pair (nat %id) (bytes %user_param)
  • nat : id must be resolvable to the user's address
  • Only that address may call this entrypoint
  • Sets current_user_param := Some (id, user_param)
• admin_cosign : pair (nat %id) (bytes %admin_param)
  • Only (metadata) admin's may call this entrypoint
  • Fails if current_user_param == None
  • Fails if current_id /= id
  • Calls log_param(id, current_user_param, admin_parm)
  • Sets current_user_param := None

Entrypoints

• Permit management entrypoints
• cosign : pair nat (or (bytes %user_cosign) (bytes %admin_cosign))
  • This entrypoint combining user_cosign and admin_cosign doesn't need to be implemented in the final contract, see MR-151 for more detail
• One-step cosigned batch permit:
  • Implemented as a batch of cosign's according to the one-step TZIP-16 specification

cosign_batch : list (pair
  (pair (nat %id) (or (bytes %user_param) (bytes %admin_param))
  (option permit_parameter))