fields = fields or ['base_uri', 'burned_receipt_id', 'burned_timestamp', 'copies', 'description', 'expires_at', 'extra', 'issued_at', 'last_transfer_receipt_id', 'last_transfer_timestamp', 'media', 'media_hash', 'metadata_content_flag', 'metadata_id', 'mint_memo', 'minted_receipt_id', 'minted_timestamp', 'minter', 'nft_contract_content_flag', 'nft_contract_created_at', 'nft_contract_icon', 'nft_contract_id', 'nft_contract_is_mintbase', 'nft_contract_name', 'nft_contract_owner_id', 'nft_contract_reference', 'nft_contract_spec', 'nft_contract_symbol', 'owner', 'reference', 'reference_blob', 'reference_hash', 'royalties', 'royalties_percent', 'splits', 'starts_at', 'title', 'token_id', 'updated_at']