Hey, I posted a new GIP that supersedes this one GIP-0023: Subgraph ownership transfer using external NFT contract
The new GIP describes a refactored implementation I had to do to get the ERC-721 properly indexed by NFT marketplaces and wallets that depend on them. I’m happy with the refactor, the architecture makes more sense, less bloated GNS code and is not changing the core behaviour of the GNS like GIP-0018.