Holds: StorageDescriptor<[Key: SS58String], {
    amount: bigint;
    id: Enum<{
        NftFractionalization: Enum<{
            Fractionalized: undefined;
        }>;
        StateTrieMigration: Enum<{
            SlashForMigrate: undefined;
        }>;
    }>;
}[], false, never>

Holds on account balances.