This is a simple subgraph that tracks ownership for an ERC 721 NFT contract. The subgraph is currently tracking token ownerhsip for 0xB467a2b26E61fAd4D8B043B79E24c6d4e6Fa5a71 deployed on Rinkeby testnet.
View it on The Graph (legacy) Explorer: https://thegraph.com/legacy-explorer/subgraph/nkrishang/erc721