CosmWasm Non-Transferable NFT with Onchain Metadata

A Non-Transferable NFT implementation by extending cw721-base and using cw_ownable functions:

initialize_owner(deps.storage, deps.api, msg.admin.as_deref())?;

and

get_ownership(deps.storage)?.owner;

to check only contract owner can execute with the additional feature of onchain metadata:

#[derive(Serialize, Deserialize, Clone, PartialEq, JsonSchema, Debug)]
pub struct Trait {
    pub display_type: Option<String>,
    pub trait_type: String,
    pub value: String,
}

#[derive(Serialize, Deserialize, Clone, PartialEq, JsonSchema, Debug)]
pub struct Metadata {
    pub image: Option<String>,
    pub image_data: Option<String>,
    pub external_url: Option<String>,
    pub description: Option<String>,
    pub name: Option<String>,
    pub attributes: Option<Vec<Trait>>,
    pub background_color: Option<String>,
    pub animation_url: Option<String>,
    pub youtube_url: Option<String>,
}

pub type Extension = Option<Metadata>;

This simplifies the json schema as it can be written now:

use cosmwasm_schema::write_api;

use nft::{ExecuteMsg, InstantiateMsg, QueryMsg};

fn main() {
    write_api! {
        instantiate: InstantiateMsg,
        execute: ExecuteMsg,
        query: QueryMsg,
    }
}

which was more complex in the cw721-non-transferable.