--- a/pallets/nonfungible/src/erc.rs
+++ b/pallets/nonfungible/src/erc.rs
@@ -15,7 +15,7 @@
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
 //! # Nonfungible Pallet EVM API
-//! 
+//!
 //! Provides ERC-721 standart support implementation and EVM API for unique extensions for Nonfungible Pallet.
 //! Method implementations are mostly doing parameter conversion and calling Nonfungible Pallet methods.
 
@@ -46,7 +46,7 @@
 };
 
 /// @title A contract that allows to set and delete token properties and change token property permissions.
-/// 
+///
 #[solidity_interface(name = "TokenProperties")]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Set permissions for token property.
@@ -212,9 +212,9 @@
 	}
 
 	/// @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-    /// @dev Throws if `tokenId` is not a valid NFT. URIs are defined in RFC
-    ///  3986. The URI may point to a JSON file that conforms to the "ERC721
-    ///  Metadata JSON Schema".
+	/// @dev Throws if `tokenId` is not a valid NFT. URIs are defined in RFC
+	///  3986. The URI may point to a JSON file that conforms to the "ERC721
+	///  Metadata JSON Schema".
 	/// @return token's const_metadata
 	#[solidity(rename_selector = "tokenURI")]
 	fn token_uri(&self, token_id: uint256) -> Result<string> {
@@ -241,9 +241,9 @@
 #[solidity_interface(name = "ERC721Enumerable")]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Enumerate valid NFTs
-    /// @param index A counter less than `totalSupply()`
-    /// @return The token identifier for the `index`th NFT,
-    ///  (sort order not specified)
+	/// @param index A counter less than `totalSupply()`
+	/// @return The token identifier for the `index`th NFT,
+	///  (sort order not specified)
 	fn token_by_index(&self, index: uint256) -> Result<uint256> {
 		Ok(index)
 	}
@@ -255,8 +255,8 @@
 	}
 
 	/// @notice Count NFTs tracked by this contract
-    /// @return A count of valid NFTs tracked by this contract, where each one of
-    ///  them has an assigned and queryable owner not equal to the zero address
+	/// @return A count of valid NFTs tracked by this contract, where each one of
+	///  them has an assigned and queryable owner not equal to the zero address
 	fn total_supply(&self) -> Result<uint256> {
 		self.consume_store_reads(1)?;
 		Ok(<Pallet<T>>::total_supply(self).into())
--- a/pallets/nonfungible/src/lib.rs
+++ b/pallets/nonfungible/src/lib.rs
@@ -48,11 +48,11 @@
 //!
 //! - **Burning:** The process of “deleting” a token from a collection and from
 //!   an account balance of the owner.
-//! 
+//!
 //! - **Nesting:** Setting up parent-child relationship between tokens. Nested tokens are inhereting
 //!   owner from their parent. There could be multiple levels of nesting. Token couldn't be nested in
 //!   it's child token i.e. parent-child relationship graph shouldn't have cycles.
-//! 
+//!
 //! - **Properties:** Key-Values pairs. Token properties are attached to a token. Collection properties are
 //!   attached to a collection. Set of permissions could be defined for each property.
 //!
@@ -83,7 +83,7 @@
 //! - `delete_collection_properties` - Remove properties from the collection.
 //! - `set_property_permission` - Set collection property permission.
 //! - `set_token_property_permissions` - Set token property permissions.
-//! 
+//!
 //! ## Assumptions
 //!
 //! * Total number of tokens of all types shouldn't be greater than `up_data_structs::MAX_TOKEN_PREFIX_LENGTH`.
@@ -369,7 +369,7 @@
 	}
 
 	/// Set the token property with the scope.
-	/// 
+	///
 	/// - `property`: Contains key-value pair.
 	pub fn set_scoped_token_property(
 		collection_id: CollectionId,
@@ -401,7 +401,7 @@
 	}
 
 	/// Add or edit auxiliary data for the property.
-	/// 
+	///
 	/// - `f`: function that adds or edits auxiliary data.
 	pub fn try_mutate_token_aux_property<R, E>(
 		collection_id: CollectionId,
@@ -424,7 +424,7 @@
 	}
 
 	/// Get all auxiliary data in a given scope.
-	/// 
+	///
 	/// Returns iterator over Property Key - Data pairs.
 	pub fn iterate_token_aux_properties(
 		collection_id: CollectionId,
@@ -565,7 +565,7 @@
 	///
 	/// - `self_budget`: Limit for searching children in depth.
 	/// - `breadth_budget`: Limit of breadth of searching children.
-	/// 
+	///
 	/// [`burn`]: struct.Pallet.html#method.burn
 	#[transactional]
 	pub fn burn_recursively(
@@ -607,10 +607,10 @@
 	}
 
 	/// Batch operation to add, edit or remove properties for the token
-	/// 
+	///
 	/// All affected properties should have mutable permission and sender should have
-	/// permission to edit those properties. 
-	/// 
+	/// permission to edit those properties.
+	///
 	/// - `nesting_budget`: Limit for searching parents in depth to check ownership.
 	/// - `is_token_create`: Indicates that method is called during token initialization.
 	///   Allows to bypass ownership check.
@@ -708,9 +708,9 @@
 	}
 
 	/// Batch operation to add or edit properties for the token
-	/// 
+	///
 	/// Same as [`modify_token_properties`] but doesn't allow to remove properties
-	/// 
+	///
 	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties
 	pub fn set_token_properties(
 		collection: &NonfungibleHandle<T>,
@@ -731,9 +731,9 @@
 	}
 
 	/// Add or edit single property for the token
-	/// 
+	///
 	/// Calls [`set_token_properties`] internally
-	/// 
+	///
 	/// [`set_token_properties`]: struct.Pallet.html#method.set_token_properties
 	pub fn set_token_property(
 		collection: &NonfungibleHandle<T>,
@@ -755,9 +755,9 @@
 	}
 
 	/// Batch operation to remove properties from the token
-	/// 
+	///
 	/// Same as [`modify_token_properties`] but doesn't allow to add or edit properties
-	/// 
+	///
 	/// [`modify_token_properties`]: struct.Pallet.html#method.modify_token_properties
 	pub fn delete_token_properties(
 		collection: &NonfungibleHandle<T>,
@@ -779,9 +779,9 @@
 	}
 
 	/// Remove single property from the token
-	/// 
+	///
 	/// Calls [`delete_token_properties`] internally
-	/// 
+	///
 	/// [`delete_token_properties`]: struct.Pallet.html#method.delete_token_properties
 	pub fn delete_token_property(
 		collection: &NonfungibleHandle<T>,
@@ -818,7 +818,7 @@
 	}
 
 	/// Set property permissions for the token.
-	/// 
+	///
 	/// Sender should be the owner or admin of token's collection.
 	pub fn set_token_property_permissions(
 		collection: &CollectionHandle<T>,
@@ -829,7 +829,7 @@
 	}
 
 	/// Set property permissions for the collection.
-	/// 
+	///
 	/// Sender should be the owner or admin of the collection.
 	pub fn set_property_permission(
 		collection: &CollectionHandle<T>,
@@ -1250,7 +1250,7 @@
 	}
 
 	/// Check that `from` token could be nested in `under` token.
-	/// 
+	///
 	pub fn check_nesting(
 		handle: &NonfungibleHandle<T>,
 		sender: T::CrossAccountId,
@@ -1321,7 +1321,7 @@
 	}
 
 	/// Mint single NFT token.
-	/// 
+	///
 	/// Delegated to [`create_multiple_items`]
 	///
 	/// [`create_multiple_items`]: struct.Pallet.html#method.create_multiple_items