git.delta.rocks / unique-network / refs/commits / 24d3f67bfdff

difftreelog

Merge pull request #848 from UniqueNetwork/fix/find-parent

Yaroslav Bolyukin2023-01-19parents: #030bc0d #05c459d.patch.diff
in: master

15 files changed

modifiedpallets/common/src/erc.rsdiffbeforeafterboth
before · pallets/common/src/erc.rs
1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617//! This module contains the implementation of pallet methods for evm.1819pub use pallet_evm::{PrecompileOutput, PrecompileResult, PrecompileHandle, account::CrossAccountId};20use evm_coder::{21	abi::AbiType,22	solidity_interface, solidity, ToLog,23	types::*,24	execution::{Result, Error},25	weight,26};27use pallet_evm_coder_substrate::dispatch_to_evm;28use sp_std::{vec, vec::Vec};29use sp_core::U256;30use up_data_structs::{31	AccessMode, CollectionMode, CollectionPermissions, OwnerRestrictedSet, Property,32	SponsoringRateLimit, SponsorshipState,33};3435use crate::{36	Pallet, CollectionHandle, Config, CollectionProperties, SelfWeightOf, eth, weights::WeightInfo,37};3839/// Events for ethereum collection helper.40#[derive(ToLog)]41pub enum CollectionHelpersEvents {42	/// The collection has been created.43	CollectionCreated {44		/// Collection owner.45		#[indexed]46		owner: Address,4748		/// Collection ID.49		#[indexed]50		collection_id: Address,51	},52	/// The collection has been destroyed.53	CollectionDestroyed {54		/// Collection ID.55		#[indexed]56		collection_id: Address,57	},58	/// The collection has been changed.59	CollectionChanged {60		/// Collection ID.61		#[indexed]62		collection_id: Address,63	},6465	/// The token has been changed.66	TokenChanged {67		/// Collection ID.68		#[indexed]69		collection_id: Address,70		/// Token ID.71		token_id: U256,72	},73}7475/// Does not always represent a full collection, for RFT it is either76/// collection (Implementing ERC721), or specific collection token (Implementing ERC20).77pub trait CommonEvmHandler {78	/// Raw compiled binary code of the contract stub79	const CODE: &'static [u8];8081	/// Call precompiled handle.82	fn call(self, handle: &mut impl PrecompileHandle) -> Option<PrecompileResult>;83}8485/// @title A contract that allows you to work with collections.86#[solidity_interface(name = Collection)]87impl<T: Config> CollectionHandle<T>88where89	T::AccountId: From<[u8; 32]> + AsRef<[u8; 32]>,90{91	/// Set collection property.92	///93	/// @param key Property key.94	/// @param value Propery value.95	#[solidity(hide)]96	#[weight(<SelfWeightOf<T>>::set_collection_properties(1))]97	fn set_collection_property(&mut self, caller: Caller, key: String, value: Bytes) -> Result<()> {98		let caller = T::CrossAccountId::from_eth(caller);99		let key = <Vec<u8>>::from(key)100			.try_into()101			.map_err(|_| "key too large")?;102		let value = value.0.try_into().map_err(|_| "value too large")?;103104		<Pallet<T>>::set_collection_property(self, &caller, Property { key, value })105			.map_err(dispatch_to_evm::<T>)106	}107108	/// Set collection properties.109	///110	/// @param properties Vector of properties key/value pair.111	#[weight(<SelfWeightOf<T>>::set_collection_properties(properties.len() as u32))]112	fn set_collection_properties(113		&mut self,114		caller: Caller,115		properties: Vec<eth::Property>,116	) -> Result<()> {117		let caller = T::CrossAccountId::from_eth(caller);118119		let properties = properties120			.into_iter()121			.map(eth::Property::try_into)122			.collect::<Result<Vec<_>>>()?;123124		<Pallet<T>>::set_collection_properties(self, &caller, properties.into_iter())125			.map_err(dispatch_to_evm::<T>)126	}127128	/// Delete collection property.129	///130	/// @param key Property key.131	#[solidity(hide)]132	#[weight(<SelfWeightOf<T>>::delete_collection_properties(1))]133	fn delete_collection_property(&mut self, caller: Caller, key: String) -> Result<()> {134		let caller = T::CrossAccountId::from_eth(caller);135		let key = <Vec<u8>>::from(key)136			.try_into()137			.map_err(|_| "key too large")?;138139		<Pallet<T>>::delete_collection_property(self, &caller, key).map_err(dispatch_to_evm::<T>)140	}141142	/// Delete collection properties.143	///144	/// @param keys Properties keys.145	#[weight(<SelfWeightOf<T>>::delete_collection_properties(keys.len() as u32))]146	fn delete_collection_properties(&mut self, caller: Caller, keys: Vec<String>) -> Result<()> {147		let caller = T::CrossAccountId::from_eth(caller);148		let keys = keys149			.into_iter()150			.map(|key| {151				<Vec<u8>>::from(key)152					.try_into()153					.map_err(|_| Error::Revert("key too large".into()))154			})155			.collect::<Result<Vec<_>>>()?;156157		<Pallet<T>>::delete_collection_properties(self, &caller, keys.into_iter())158			.map_err(dispatch_to_evm::<T>)159	}160161	/// Get collection property.162	///163	/// @dev Throws error if key not found.164	///165	/// @param key Property key.166	/// @return bytes The property corresponding to the key.167	fn collection_property(&self, key: String) -> Result<Bytes> {168		let key = <Vec<u8>>::from(key)169			.try_into()170			.map_err(|_| "key too large")?;171172		let props = CollectionProperties::<T>::get(self.id);173		let prop = props.get(&key).ok_or("key not found")?;174175		Ok(Bytes(prop.to_vec()))176	}177178	/// Get collection properties.179	///180	/// @param keys Properties keys. Empty keys for all propertyes.181	/// @return Vector of properties key/value pairs.182	fn collection_properties(&self, keys: Vec<String>) -> Result<Vec<eth::Property>> {183		let keys = keys184			.into_iter()185			.map(|key| {186				<Vec<u8>>::from(key)187					.try_into()188					.map_err(|_| Error::Revert("key too large".into()))189			})190			.collect::<Result<Vec<_>>>()?;191192		let properties = Pallet::<T>::filter_collection_properties(193			self.id,194			if keys.is_empty() { None } else { Some(keys) },195		)196		.map_err(dispatch_to_evm::<T>)?;197198		let properties = properties199			.into_iter()200			.map(Property::try_into)201			.collect::<Result<Vec<_>>>()?;202		Ok(properties)203	}204205	/// Set the sponsor of the collection.206	///207	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.208	///209	/// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.210	#[solidity(hide)]211	fn set_collection_sponsor(&mut self, caller: Caller, sponsor: Address) -> Result<()> {212		self.consume_store_reads_and_writes(1, 1)?;213214		let caller = T::CrossAccountId::from_eth(caller);215216		let sponsor = T::CrossAccountId::from_eth(sponsor);217		self.set_sponsor(&caller, sponsor.as_sub().clone())218			.map_err(dispatch_to_evm::<T>)219	}220221	/// Set the sponsor of the collection.222	///223	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.224	///225	/// @param sponsor Cross account address of the sponsor from whose account funds will be debited for operations with the contract.226	fn set_collection_sponsor_cross(227		&mut self,228		caller: Caller,229		sponsor: eth::CrossAddress,230	) -> Result<()> {231		self.consume_store_reads_and_writes(1, 1)?;232233		let caller = T::CrossAccountId::from_eth(caller);234235		let sponsor = sponsor.into_sub_cross_account::<T>()?;236		self.set_sponsor(&caller, sponsor.as_sub().clone())237			.map_err(dispatch_to_evm::<T>)238	}239240	/// Whether there is a pending sponsor.241	fn has_collection_pending_sponsor(&self) -> Result<bool> {242		Ok(matches!(243			self.collection.sponsorship,244			SponsorshipState::Unconfirmed(_)245		))246	}247248	/// Collection sponsorship confirmation.249	///250	/// @dev After setting the sponsor for the collection, it must be confirmed with this function.251	fn confirm_collection_sponsorship(&mut self, caller: Caller) -> Result<()> {252		self.consume_store_writes(1)?;253254		let caller = T::CrossAccountId::from_eth(caller);255		self.confirm_sponsorship(caller.as_sub())256			.map_err(dispatch_to_evm::<T>)257	}258259	/// Remove collection sponsor.260	fn remove_collection_sponsor(&mut self, caller: Caller) -> Result<()> {261		self.consume_store_reads_and_writes(1, 1)?;262		let caller = T::CrossAccountId::from_eth(caller);263		self.remove_sponsor(&caller).map_err(dispatch_to_evm::<T>)264	}265266	/// Get current sponsor.267	///268	/// @return Tuble with sponsor address and his substrate mirror. If there is no confirmed sponsor error "Contract has no sponsor" throw.269	fn collection_sponsor(&self) -> Result<eth::CrossAddress> {270		let sponsor = match self.collection.sponsorship.sponsor() {271			Some(sponsor) => sponsor,272			None => return Ok(Default::default()),273		};274275		Ok(eth::CrossAddress::from_sub::<T>(&sponsor))276	}277278	/// Get current collection limits.279	///280	/// @return Array of collection limits281	fn collection_limits(&self) -> Result<Vec<eth::CollectionLimit>> {282		let limits = &self.collection.limits;283284		let convert_value_from_bool = |ob: Option<bool>| match ob {285			Some(b) => Some(b as u32),286			None => None,287		};288289		Ok(vec![290			eth::CollectionLimit::new(291				eth::CollectionLimitField::AccountTokenOwnership,292				limits.account_token_ownership_limit,293			),294			eth::CollectionLimit::new(295				eth::CollectionLimitField::SponsoredDataSize,296				limits.sponsored_data_size,297			),298			limits299				.sponsored_data_rate_limit300				.and_then(|limit| {301					if let SponsoringRateLimit::Blocks(blocks) = limit {302						Some(eth::CollectionLimit::new(303							eth::CollectionLimitField::SponsoredDataRateLimit,304							Some(blocks),305						))306					} else {307						None308					}309				})310				.unwrap_or(eth::CollectionLimit::new(311					eth::CollectionLimitField::SponsoredDataRateLimit,312					Default::default(),313				)),314			eth::CollectionLimit::new(eth::CollectionLimitField::TokenLimit, limits.token_limit),315			eth::CollectionLimit::new(316				eth::CollectionLimitField::SponsorTransferTimeout,317				limits.sponsor_transfer_timeout,318			),319			eth::CollectionLimit::new(320				eth::CollectionLimitField::SponsorApproveTimeout,321				limits.sponsor_approve_timeout,322			),323			eth::CollectionLimit::new(324				eth::CollectionLimitField::OwnerCanTransfer,325				convert_value_from_bool(limits.owner_can_transfer),326			),327			eth::CollectionLimit::new(328				eth::CollectionLimitField::OwnerCanDestroy,329				convert_value_from_bool(limits.owner_can_destroy),330			),331			eth::CollectionLimit::new(332				eth::CollectionLimitField::TransferEnabled,333				convert_value_from_bool(limits.transfers_enabled),334			),335		])336	}337338	/// Set limits for the collection.339	/// @dev Throws error if limit not found.340	/// @param limit Some limit.341	#[solidity(rename_selector = "setCollectionLimit")]342	fn set_collection_limit(&mut self, caller: Caller, limit: eth::CollectionLimit) -> Result<()> {343		self.consume_store_reads_and_writes(1, 1)?;344345		if !limit.has_value() {346			return Err(Error::Revert("user can't disable limits".into()));347		}348349		let caller = T::CrossAccountId::from_eth(caller);350		<Pallet<T>>::update_limits(&caller, self, limit.try_into()?).map_err(dispatch_to_evm::<T>)351	}352353	/// Get contract address.354	fn contract_address(&self) -> Result<Address> {355		Ok(crate::eth::collection_id_to_address(self.id))356	}357358	/// Add collection admin.359	/// @param newAdmin Cross account administrator address.360	fn add_collection_admin_cross(361		&mut self,362		caller: Caller,363		new_admin: eth::CrossAddress,364	) -> Result<()> {365		self.consume_store_reads_and_writes(2, 2)?;366367		let caller = T::CrossAccountId::from_eth(caller);368		let new_admin = new_admin.into_sub_cross_account::<T>()?;369		<Pallet<T>>::toggle_admin(self, &caller, &new_admin, true).map_err(dispatch_to_evm::<T>)?;370		Ok(())371	}372373	/// Remove collection admin.374	/// @param admin Cross account administrator address.375	fn remove_collection_admin_cross(376		&mut self,377		caller: Caller,378		admin: eth::CrossAddress,379	) -> Result<()> {380		self.consume_store_reads_and_writes(2, 2)?;381382		let caller = T::CrossAccountId::from_eth(caller);383		let admin = admin.into_sub_cross_account::<T>()?;384		<Pallet<T>>::toggle_admin(self, &caller, &admin, false).map_err(dispatch_to_evm::<T>)?;385		Ok(())386	}387388	/// Add collection admin.389	/// @param newAdmin Address of the added administrator.390	#[solidity(hide)]391	fn add_collection_admin(&mut self, caller: Caller, new_admin: Address) -> Result<()> {392		self.consume_store_reads_and_writes(2, 2)?;393394		let caller = T::CrossAccountId::from_eth(caller);395		let new_admin = T::CrossAccountId::from_eth(new_admin);396		<Pallet<T>>::toggle_admin(self, &caller, &new_admin, true).map_err(dispatch_to_evm::<T>)?;397		Ok(())398	}399400	/// Remove collection admin.401	///402	/// @param admin Address of the removed administrator.403	#[solidity(hide)]404	fn remove_collection_admin(&mut self, caller: Caller, admin: Address) -> Result<()> {405		self.consume_store_reads_and_writes(2, 2)?;406407		let caller = T::CrossAccountId::from_eth(caller);408		let admin = T::CrossAccountId::from_eth(admin);409		<Pallet<T>>::toggle_admin(self, &caller, &admin, false).map_err(dispatch_to_evm::<T>)?;410		Ok(())411	}412413	/// Toggle accessibility of collection nesting.414	///415	/// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'416	#[solidity(rename_selector = "setCollectionNesting")]417	fn set_nesting_bool(&mut self, caller: Caller, enable: bool) -> Result<()> {418		self.consume_store_reads_and_writes(1, 1)?;419420		let caller = T::CrossAccountId::from_eth(caller);421422		let mut permissions = self.collection.permissions.clone();423		let mut nesting = permissions.nesting().clone();424		nesting.token_owner = enable;425		nesting.restricted = None;426		permissions.nesting = Some(nesting);427428		<Pallet<T>>::update_permissions(&caller, self, permissions).map_err(dispatch_to_evm::<T>)429	}430431	/// Toggle accessibility of collection nesting.432	///433	/// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'434	/// @param collections Addresses of collections that will be available for nesting.435	#[solidity(rename_selector = "setCollectionNesting")]436	fn set_nesting(437		&mut self,438		caller: Caller,439		enable: bool,440		collections: Vec<Address>,441	) -> Result<()> {442		self.consume_store_reads_and_writes(1, 1)?;443444		if collections.is_empty() {445			return Err("no addresses provided".into());446		}447		let caller = T::CrossAccountId::from_eth(caller);448449		let mut permissions = self.collection.permissions.clone();450		match enable {451			false => {452				let mut nesting = permissions.nesting().clone();453				nesting.token_owner = false;454				nesting.restricted = None;455				permissions.nesting = Some(nesting);456			}457			true => {458				let mut bv = OwnerRestrictedSet::new();459				for i in collections {460					bv.try_insert(crate::eth::map_eth_to_id(&i).ok_or_else(|| {461						Error::Revert("Can't convert address into collection id".into())462					})?)463					.map_err(|_| "too many collections")?;464				}465				let mut nesting = permissions.nesting().clone();466				nesting.token_owner = true;467				nesting.restricted = Some(bv);468				permissions.nesting = Some(nesting);469			}470		};471472		<Pallet<T>>::update_permissions(&caller, self, permissions).map_err(dispatch_to_evm::<T>)473	}474475	/// Returns nesting for a collection476	#[solidity(rename_selector = "collectionNestingRestrictedCollectionIds")]477	fn collection_nesting_restricted_ids(&self) -> Result<eth::CollectionNesting> {478		let nesting = self.collection.permissions.nesting();479480		Ok(eth::CollectionNesting::new(481			nesting.token_owner,482			nesting483				.restricted484				.clone()485				.map(|b| b.0.into_inner().iter().map(|id| id.0.into()).collect())486				.unwrap_or_default(),487		))488	}489490	/// Returns permissions for a collection491	fn collection_nesting_permissions(&self) -> Result<Vec<eth::CollectionNestingPermission>> {492		let nesting = self.collection.permissions.nesting();493		Ok(vec![494			eth::CollectionNestingPermission::new(495				eth::CollectionPermissionField::CollectionAdmin,496				nesting.collection_admin,497			),498			eth::CollectionNestingPermission::new(499				eth::CollectionPermissionField::TokenOwner,500				nesting.token_owner,501			),502		])503	}504	/// Set the collection access method.505	/// @param mode Access mode506	fn set_collection_access(&mut self, caller: Caller, mode: eth::AccessMode) -> Result<()> {507		self.consume_store_reads_and_writes(1, 1)?;508509		let caller = T::CrossAccountId::from_eth(caller);510		let permissions = CollectionPermissions {511			access: Some(mode.into()),512			..Default::default()513		};514		<Pallet<T>>::update_permissions(&caller, self, permissions).map_err(dispatch_to_evm::<T>)515	}516517	/// Checks that user allowed to operate with collection.518	///519	/// @param user User address to check.520	fn allowlisted_cross(&self, user: eth::CrossAddress) -> Result<bool> {521		let user = user.into_sub_cross_account::<T>()?;522		Ok(Pallet::<T>::allowed(self.id, user))523	}524525	/// Add the user to the allowed list.526	///527	/// @param user Address of a trusted user.528	#[solidity(hide)]529	fn add_to_collection_allow_list(&mut self, caller: Caller, user: Address) -> Result<()> {530		self.consume_store_writes(1)?;531532		let caller = T::CrossAccountId::from_eth(caller);533		let user = T::CrossAccountId::from_eth(user);534		<Pallet<T>>::toggle_allowlist(self, &caller, &user, true).map_err(dispatch_to_evm::<T>)?;535		Ok(())536	}537538	/// Add user to allowed list.539	///540	/// @param user User cross account address.541	fn add_to_collection_allow_list_cross(542		&mut self,543		caller: Caller,544		user: eth::CrossAddress,545	) -> Result<()> {546		self.consume_store_writes(1)?;547548		let caller = T::CrossAccountId::from_eth(caller);549		let user = user.into_sub_cross_account::<T>()?;550		Pallet::<T>::toggle_allowlist(self, &caller, &user, true).map_err(dispatch_to_evm::<T>)?;551		Ok(())552	}553554	/// Remove the user from the allowed list.555	///556	/// @param user Address of a removed user.557	#[solidity(hide)]558	fn remove_from_collection_allow_list(&mut self, caller: Caller, user: Address) -> Result<()> {559		self.consume_store_writes(1)?;560561		let caller = T::CrossAccountId::from_eth(caller);562		let user = T::CrossAccountId::from_eth(user);563		<Pallet<T>>::toggle_allowlist(self, &caller, &user, false).map_err(dispatch_to_evm::<T>)?;564		Ok(())565	}566567	/// Remove user from allowed list.568	///569	/// @param user User cross account address.570	fn remove_from_collection_allow_list_cross(571		&mut self,572		caller: Caller,573		user: eth::CrossAddress,574	) -> Result<()> {575		self.consume_store_writes(1)?;576577		let caller = T::CrossAccountId::from_eth(caller);578		let user = user.into_sub_cross_account::<T>()?;579		Pallet::<T>::toggle_allowlist(self, &caller, &user, false).map_err(dispatch_to_evm::<T>)?;580		Ok(())581	}582583	/// Switch permission for minting.584	///585	/// @param mode Enable if "true".586	fn set_collection_mint_mode(&mut self, caller: Caller, mode: bool) -> Result<()> {587		self.consume_store_reads_and_writes(1, 1)?;588589		let caller = T::CrossAccountId::from_eth(caller);590		let permissions = CollectionPermissions {591			mint_mode: Some(mode),592			..Default::default()593		};594		<Pallet<T>>::update_permissions(&caller, self, permissions).map_err(dispatch_to_evm::<T>)595	}596597	/// Check that account is the owner or admin of the collection598	///599	/// @param user account to verify600	/// @return "true" if account is the owner or admin601	#[solidity(hide, rename_selector = "isOwnerOrAdmin")]602	fn is_owner_or_admin_eth(&self, user: Address) -> Result<bool> {603		let user = T::CrossAccountId::from_eth(user);604		Ok(self.is_owner_or_admin(&user))605	}606607	/// Check that account is the owner or admin of the collection608	///609	/// @param user User cross account to verify610	/// @return "true" if account is the owner or admin611	fn is_owner_or_admin_cross(&self, user: eth::CrossAddress) -> Result<bool> {612		let user = user.into_sub_cross_account::<T>()?;613		Ok(self.is_owner_or_admin(&user))614	}615616	/// Returns collection type617	///618	/// @return `Fungible` or `NFT` or `ReFungible`619	fn unique_collection_type(&self) -> Result<String> {620		let mode = match self.collection.mode {621			CollectionMode::Fungible(_) => "Fungible",622			CollectionMode::NFT => "NFT",623			CollectionMode::ReFungible => "ReFungible",624		};625		Ok(mode.into())626	}627628	/// Get collection owner.629	///630	/// @return Tuble with sponsor address and his substrate mirror.631	/// If address is canonical then substrate mirror is zero and vice versa.632	fn collection_owner(&self) -> Result<eth::CrossAddress> {633		Ok(eth::CrossAddress::from_sub_cross_account::<T>(634			&T::CrossAccountId::from_sub(self.owner.clone()),635		))636	}637638	/// Changes collection owner to another account639	///640	/// @dev Owner can be changed only by current owner641	/// @param newOwner new owner account642	#[solidity(hide, rename_selector = "changeCollectionOwner")]643	fn set_owner(&mut self, caller: Caller, new_owner: Address) -> Result<()> {644		self.consume_store_writes(1)?;645646		let caller = T::CrossAccountId::from_eth(caller);647		let new_owner = T::CrossAccountId::from_eth(new_owner);648		self.change_owner(caller, new_owner)649			.map_err(dispatch_to_evm::<T>)650	}651652	/// Get collection administrators653	///654	/// @return Vector of tuples with admins address and his substrate mirror.655	/// If address is canonical then substrate mirror is zero and vice versa.656	fn collection_admins(&self) -> Result<Vec<eth::CrossAddress>> {657		let result = crate::IsAdmin::<T>::iter_prefix((self.id,))658			.map(|(admin, _)| eth::CrossAddress::from_sub_cross_account::<T>(&admin))659			.collect();660		Ok(result)661	}662663	/// Changes collection owner to another account664	///665	/// @dev Owner can be changed only by current owner666	/// @param newOwner new owner cross account667	fn change_collection_owner_cross(668		&mut self,669		caller: Caller,670		new_owner: eth::CrossAddress,671	) -> Result<()> {672		self.consume_store_writes(1)?;673674		let caller = T::CrossAccountId::from_eth(caller);675		let new_owner = new_owner.into_sub_cross_account::<T>()?;676		self.change_owner(caller, new_owner)677			.map_err(dispatch_to_evm::<T>)678	}679}680681/// Contains static property keys and values.682pub mod static_property {683	use evm_coder::{684		execution::{Result, Error},685	};686	use alloc::format;687688	const EXPECT_CONVERT_ERROR: &str = "length < limit";689690	/// Keys.691	pub mod key {692		use super::*;693694		/// Key "baseURI".695		pub fn base_uri() -> up_data_structs::PropertyKey {696			property_key_from_bytes(b"baseURI").expect(EXPECT_CONVERT_ERROR)697		}698699		/// Key "url".700		pub fn url() -> up_data_structs::PropertyKey {701			property_key_from_bytes(b"URI").expect(EXPECT_CONVERT_ERROR)702		}703704		/// Key "suffix".705		pub fn suffix() -> up_data_structs::PropertyKey {706			property_key_from_bytes(b"URISuffix").expect(EXPECT_CONVERT_ERROR)707		}708709		/// Key "parentNft".710		pub fn parent_nft() -> up_data_structs::PropertyKey {711			property_key_from_bytes(b"parentNft").expect(EXPECT_CONVERT_ERROR)712		}713	}714715	/// Convert `byte` to [`PropertyKey`].716	pub fn property_key_from_bytes(bytes: &[u8]) -> Result<up_data_structs::PropertyKey> {717		bytes.to_vec().try_into().map_err(|_| {718			Error::Revert(format!(719				"Property key is too long. Max length is {}.",720				up_data_structs::PropertyKey::bound()721			))722		})723	}724725	/// Convert `bytes` to [`PropertyValue`].726	pub fn property_value_from_bytes(bytes: &[u8]) -> Result<up_data_structs::PropertyValue> {727		bytes.to_vec().try_into().map_err(|_| {728			Error::Revert(format!(729				"Property key is too long. Max length is {}.",730				up_data_structs::PropertyKey::bound()731			))732		})733	}734}
modifiedpallets/common/src/eth.rsdiffbeforeafterboth
--- a/pallets/common/src/eth.rs
+++ b/pallets/common/src/eth.rs
@@ -80,10 +80,7 @@
 		if cross_account_id.is_canonical_substrate() {
 			Self::from_sub::<T>(cross_account_id.as_sub())
 		} else {
-			Self {
-				eth: *cross_account_id.as_eth(),
-				sub: Default::default(),
-			}
+			Self::from_eth(*cross_account_id.as_eth())
 		}
 	}
 	/// Creates [`CrossAddress`] from Substrate account.
@@ -97,6 +94,13 @@
 			sub: U256::from_big_endian(account_id.as_ref()),
 		}
 	}
+	/// Creates [`CrossAddress`] from Ethereum account.
+	pub fn from_eth(address: Address) -> Self {
+		Self {
+			eth: address,
+			sub: Default::default(),
+		}
+	}
 	/// Converts [`CrossAddress`] to `CrossAccountId`.
 	pub fn into_sub_cross_account<T>(&self) -> evm_coder::execution::Result<T::CrossAccountId>
 	where
modifiedpallets/common/src/lib.rsdiffbeforeafterboth
--- a/pallets/common/src/lib.rs
+++ b/pallets/common/src/lib.rs
@@ -100,6 +100,7 @@
 	PropertyValue,
 	PropertyPermission,
 	PropertiesError,
+	TokenOwnerError,
 	PropertyKeyPermission,
 	TokenData,
 	TrySetProperty,
@@ -2134,7 +2135,7 @@
 	/// Get the owner of the token.
 	///
 	/// * `token` - The token for which you need to find out the owner.
-	fn token_owner(&self, token: TokenId) -> Option<T::CrossAccountId>;
+	fn token_owner(&self, token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError>;
 
 	/// Returns 10 tokens owners in no particular order.
 	///
modifiedpallets/fungible/src/common.rsdiffbeforeafterboth
--- a/pallets/fungible/src/common.rs
+++ b/pallets/fungible/src/common.rs
@@ -17,7 +17,9 @@
 use core::marker::PhantomData;
 
 use frame_support::{dispatch::DispatchResultWithPostInfo, ensure, fail, weights::Weight, traits::Get};
-use up_data_structs::{TokenId, CollectionId, CreateItemExData, budget::Budget, CreateItemData};
+use up_data_structs::{
+	TokenId, CollectionId, CreateItemExData, budget::Budget, CreateItemData, TokenOwnerError,
+};
 use pallet_common::{
 	CommonCollectionOperations, CommonWeightInfo, RefungibleExtensions, with_weight,
 	weights::WeightInfo as _,
@@ -404,8 +406,8 @@
 		TokenId::default()
 	}
 
-	fn token_owner(&self, _token: TokenId) -> Option<T::CrossAccountId> {
-		None
+	fn token_owner(&self, _token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError> {
+		Err(TokenOwnerError::MultipleOwners)
 	}
 
 	/// Returns 10 tokens owners in no particular order.
modifiedpallets/nonfungible/src/common.rsdiffbeforeafterboth
--- a/pallets/nonfungible/src/common.rs
+++ b/pallets/nonfungible/src/common.rs
@@ -19,7 +19,7 @@
 use frame_support::{dispatch::DispatchResultWithPostInfo, ensure, fail, weights::Weight};
 use up_data_structs::{
 	TokenId, CreateItemExData, CollectionId, budget::Budget, Property, PropertyKey,
-	PropertyKeyPermission, PropertyValue,
+	PropertyKeyPermission, PropertyValue, TokenOwnerError,
 };
 use pallet_common::{
 	CommonCollectionOperations, CommonWeightInfo, RefungibleExtensions, with_weight,
@@ -460,13 +460,15 @@
 		TokenId(<TokensMinted<T>>::get(self.id))
 	}
 
-	fn token_owner(&self, token: TokenId) -> Option<T::CrossAccountId> {
-		<TokenData<T>>::get((self.id, token)).map(|t| t.owner)
+	fn token_owner(&self, token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError> {
+		<TokenData<T>>::get((self.id, token))
+			.map(|t| t.owner)
+			.ok_or(TokenOwnerError::NotFound)
 	}
 
 	/// Returns token owners.
 	fn token_owners(&self, token: TokenId) -> Vec<T::CrossAccountId> {
-		self.token_owner(token).map_or_else(|| vec![], |t| vec![t])
+		self.token_owner(token).map_or_else(|_| vec![], |t| vec![t])
 	}
 
 	fn token_property(&self, token_id: TokenId, key: &PropertyKey) -> Option<PropertyValue> {
modifiedpallets/nonfungible/src/erc.rsdiffbeforeafterboth
--- a/pallets/nonfungible/src/erc.rs
+++ b/pallets/nonfungible/src/erc.rs
@@ -728,7 +728,7 @@
 	fn cross_owner_of(&self, token_id: U256) -> Result<eth::CrossAddress> {
 		Self::token_owner(&self, token_id.try_into()?)
 			.map(|o| eth::CrossAddress::from_sub_cross_account::<T>(&o))
-			.ok_or(Error::Revert("key too large".into()))
+			.map_err(|_| Error::Revert("token not found".into()))
 	}
 
 	/// Returns the token properties.
modifiedpallets/proxy-rmrk-core/src/lib.rsdiffbeforeafterboth
--- a/pallets/proxy-rmrk-core/src/lib.rs
+++ b/pallets/proxy-rmrk-core/src/lib.rs
@@ -741,7 +741,8 @@
 						Some((collection_id, nft_id)),
 						&target_nft_budget,
 					)
-					.map_err(Self::map_unique_err_to_proxy)?;
+					.map_err(Self::map_unique_err_to_proxy)?
+					.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 					approval_required = cross_sender != target_nft_owner;
 
@@ -989,7 +990,8 @@
 
 			let nft_owner =
 				<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)
-					.map_err(|_| <Error<T>>::ResourceDoesntExist)?;
+					.map_err(|_| <Error<T>>::ResourceDoesntExist)?
+					.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 			Self::try_mutate_resource_info(collection_id, nft_id, resource_id, |res| {
 				ensure!(res.pending, <Error<T>>::ResourceNotPending);
@@ -1044,7 +1046,8 @@
 
 			let nft_owner =
 				<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)
-					.map_err(|_| <Error<T>>::ResourceDoesntExist)?;
+					.map_err(|_| <Error<T>>::ResourceDoesntExist)?
+					.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 			ensure!(cross_sender == nft_owner, <Error<T>>::NoPermission);
 
@@ -1666,7 +1669,8 @@
 		let budget = budget::Value::new(NESTING_BUDGET);
 
 		let nft_owner = <PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)
-			.map_err(Self::map_unique_err_to_proxy)?;
+			.map_err(Self::map_unique_err_to_proxy)?
+			.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 		let pending = sender != nft_owner;
 
@@ -1720,7 +1724,8 @@
 
 		let budget = up_data_structs::budget::Value::new(NESTING_BUDGET);
 		let topmost_owner =
-			<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)?;
+			<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)?
+				.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 		let sender = T::CrossAccountId::from_sub(sender);
 		if topmost_owner == sender {
modifiedpallets/proxy-rmrk-core/src/rpc.rsdiffbeforeafterboth
--- a/pallets/proxy-rmrk-core/src/rpc.rs
+++ b/pallets/proxy-rmrk-core/src/rpc.rs
@@ -68,7 +68,7 @@
 	}
 
 	let owner = match collection.token_owner(nft_id) {
-		Some(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
+		Ok(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
 			Some((col, tok)) => {
 				let rmrk_collection = <Pallet<T>>::rmrk_collection_id(col)?;
 
@@ -76,7 +76,7 @@
 			}
 			None => RmrkAccountIdOrCollectionNftTuple::AccountId(owner.as_sub().clone()),
 		},
-		None => return Ok(None),
+		_ => return Ok(None),
 	};
 
 	Ok(Some(RmrkInstanceInfo {
modifiedpallets/refungible/src/common.rsdiffbeforeafterboth
--- a/pallets/refungible/src/common.rs
+++ b/pallets/refungible/src/common.rs
@@ -21,7 +21,7 @@
 use up_data_structs::{
 	CollectionId, TokenId, CreateItemExData, budget::Budget, Property, PropertyKey, PropertyValue,
 	PropertyKeyPermission, CollectionPropertiesVec, CreateRefungibleExMultipleOwners,
-	CreateRefungibleExSingleOwner,
+	CreateRefungibleExSingleOwner, TokenOwnerError,
 };
 use pallet_common::{
 	CommonCollectionOperations, CommonWeightInfo, RefungibleExtensions, with_weight,
@@ -478,7 +478,7 @@
 		TokenId(<TokensMinted<T>>::get(self.id))
 	}
 
-	fn token_owner(&self, token: TokenId) -> Option<T::CrossAccountId> {
+	fn token_owner(&self, token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError> {
 		<Pallet<T>>::token_owner(self.id, token)
 	}
 
modifiedpallets/refungible/src/erc.rsdiffbeforeafterboth
--- a/pallets/refungible/src/erc.rs
+++ b/pallets/refungible/src/erc.rs
@@ -43,7 +43,7 @@
 use sp_std::{collections::btree_map::BTreeMap, vec::Vec, vec};
 use up_data_structs::{
 	CollectionId, CollectionPropertiesVec, mapping::TokenAddressMapping, Property, PropertyKey,
-	PropertyKeyPermission, PropertyPermission, TokenId,
+	PropertyKeyPermission, PropertyPermission, TokenId, TokenOwnerError,
 };
 
 use crate::{
@@ -411,9 +411,12 @@
 		self.consume_store_reads(2)?;
 		let token = token_id.try_into()?;
 		let owner = <Pallet<T>>::token_owner(self.id, token);
-		Ok(owner
+		owner
 			.map(|address| *address.as_eth())
-			.unwrap_or_else(|| ADDRESS_FOR_PARTIALLY_OWNED_TOKENS))
+			.or_else(|err| match err {
+				TokenOwnerError::NotFound => Err(Error::Revert("token not found".into())),
+				TokenOwnerError::MultipleOwners => Ok(ADDRESS_FOR_PARTIALLY_OWNED_TOKENS),
+			})
 	}
 
 	/// @dev Not implemented
@@ -766,7 +769,12 @@
 	fn cross_owner_of(&self, token_id: U256) -> Result<eth::CrossAddress> {
 		Self::token_owner(&self, token_id.try_into()?)
 			.map(|o| eth::CrossAddress::from_sub_cross_account::<T>(&o))
-			.ok_or(Error::Revert("key too large".into()))
+			.or_else(|err| match err {
+				TokenOwnerError::NotFound => Err(Error::Revert("token not found".into())),
+				TokenOwnerError::MultipleOwners => Ok(eth::CrossAddress::from_eth(
+					ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,
+				)),
+			})
 	}
 
 	/// Returns the token properties.
modifiedpallets/refungible/src/lib.rsdiffbeforeafterboth
--- a/pallets/refungible/src/lib.rs
+++ b/pallets/refungible/src/lib.rs
@@ -107,7 +107,7 @@
 	AccessMode, budget::Budget, CollectionId, CollectionFlags, CreateCollectionData,
 	mapping::TokenAddressMapping, MAX_REFUNGIBLE_PIECES, Property, PropertyKey,
 	PropertyKeyPermission, PropertyPermission, PropertyScope, PropertyValue, TokenId,
-	TrySetProperty, PropertiesPermissionMap, CreateRefungibleExMultipleOwners,
+	TrySetProperty, PropertiesPermissionMap, CreateRefungibleExMultipleOwners, TokenOwnerError,
 };
 
 pub use pallet::*;
@@ -480,7 +480,7 @@
 			<Balance<T>>::remove((collection.id, token, owner));
 			<AccountBalance<T>>::insert((collection.id, owner), account_balance);
 
-			if let Some(user) = Self::token_owner(collection.id, token) {
+			if let Ok(user) = Self::token_owner(collection.id, token) {
 				<PalletEvm<T>>::deposit_log(
 					ERC721Events::Transfer {
 						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,
@@ -1365,17 +1365,20 @@
 		Ok(())
 	}
 
-	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {
+	fn token_owner(
+		collection_id: CollectionId,
+		token_id: TokenId,
+	) -> Result<T::CrossAccountId, TokenOwnerError> {
 		let mut owner = None;
 		let mut count = 0;
 		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {
 			count += 1;
 			if count > 1 {
-				return None;
+				return Err(TokenOwnerError::MultipleOwners);
 			}
 			owner = Some(key);
 		}
-		owner
+		owner.ok_or(TokenOwnerError::NotFound)
 	}
 
 	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {
modifiedpallets/structure/src/lib.rsdiffbeforeafterboth
--- a/pallets/structure/src/lib.rs
+++ b/pallets/structure/src/lib.rs
@@ -61,7 +61,9 @@
 use frame_support::fail;
 pub use pallet::*;
 use pallet_common::{dispatch::CollectionDispatch, CollectionHandle};
-use up_data_structs::{CollectionId, TokenId, mapping::TokenAddressMapping, budget::Budget};
+use up_data_structs::{
+	CollectionId, TokenId, mapping::TokenAddressMapping, budget::Budget, TokenOwnerError,
+};
 
 #[cfg(feature = "runtime-benchmarks")]
 pub mod benchmarking;
@@ -135,6 +137,8 @@
 	User(CrossAccountId),
 	/// Could not find the token provided as the owner.
 	TokenNotFound,
+	/// Nested token has multiple owners.
+	MultipleOwners,
 	/// Token owner is another token (still, the target token may not exist).
 	Token(CollectionId, TokenId),
 }
@@ -159,11 +163,12 @@
 		let handle = handle.as_dyn();
 
 		Ok(match handle.token_owner(token) {
-			Some(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
+			Ok(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
 				Some((collection, token)) => Parent::Token(collection, token),
 				None => Parent::User(owner),
 			},
-			None => Parent::TokenNotFound,
+			Err(TokenOwnerError::MultipleOwners) => Parent::MultipleOwners,
+			Err(TokenOwnerError::NotFound) => Parent::TokenNotFound,
 		})
 	}
 
@@ -203,19 +208,27 @@
 	///
 	/// May return token address if parent token not yet exists
 	///
+	/// Returns `None` if the token has multiple owners.
+	///
 	/// - `budget`: Limit for searching parents in depth.
 	pub fn find_topmost_owner(
 		collection: CollectionId,
 		token: TokenId,
 		budget: &dyn Budget,
-	) -> Result<T::CrossAccountId, DispatchError> {
+	) -> Result<Option<T::CrossAccountId>, DispatchError> {
 		let owner = Self::parent_chain(collection, token)
 			.take_while(|_| budget.consume())
-			.find(|p| matches!(p, Ok(Parent::User(_) | Parent::TokenNotFound)))
+			.find(|p| {
+				matches!(
+					p,
+					Ok(Parent::User(_) | Parent::TokenNotFound | Parent::MultipleOwners)
+				)
+			})
 			.ok_or(<Error<T>>::DepthLimit)??;
 
 		Ok(match owner {
-			Parent::User(v) => v,
+			Parent::User(v) => Some(v),
+			Parent::MultipleOwners => None,
 			_ => fail!(<Error<T>>::TokenNotFound),
 		})
 	}
@@ -223,13 +236,15 @@
 	/// Find the topmost parent and check that assigning `for_nest` token as a child for
 	/// `token` wouldn't create a cycle.
 	///
+	/// Returns `None` if the token has multiple owners.
+	///
 	/// - `budget`: Limit for searching parents in depth.
 	pub fn get_checked_topmost_owner(
 		collection: CollectionId,
 		token: TokenId,
 		for_nest: Option<(CollectionId, TokenId)>,
 		budget: &dyn Budget,
-	) -> Result<T::CrossAccountId, DispatchError> {
+	) -> Result<Option<T::CrossAccountId>, DispatchError> {
 		// Tried to nest token in itself
 		if Some((collection, token)) == for_nest {
 			return Err(<Error<T>>::OuroborosDetected.into());
@@ -242,8 +257,9 @@
 					return Err(<Error<T>>::OuroborosDetected.into())
 				}
 				// Token is owned by other user
-				Parent::User(user) => return Ok(user),
+				Parent::User(user) => return Ok(Some(user)),
 				Parent::TokenNotFound => return Err(<Error<T>>::TokenNotFound.into()),
+				Parent::MultipleOwners => return Ok(None),
 				// Continue parent chain
 				Parent::Token(_, _) => {}
 			}
@@ -284,12 +300,17 @@
 		budget: &dyn Budget,
 	) -> Result<bool, DispatchError> {
 		let target_parent = match T::CrossTokenAddressMapping::address_to_token(&user) {
-			Some((collection, token)) => Self::find_topmost_owner(collection, token, budget)?,
+			Some((collection, token)) => match Self::find_topmost_owner(collection, token, budget)?
+			{
+				Some(topmost_owner) => topmost_owner,
+				None => return Ok(false),
+			},
 			None => user,
 		};
 
-		Self::get_checked_topmost_owner(collection, token, for_nest, budget)
-			.map(|indirect_owner| indirect_owner == target_parent)
+		Self::get_checked_topmost_owner(collection, token, for_nest, budget).map(|indirect_owner| {
+			indirect_owner.map_or(false, |indirect_owner| indirect_owner == target_parent)
+		})
 	}
 
 	/// Checks that `under` is valid token and that `token_id` could be nested under it
modifiedprimitives/data-structs/src/lib.rsdiffbeforeafterboth
--- a/primitives/data-structs/src/lib.rs
+++ b/primitives/data-structs/src/lib.rs
@@ -1099,6 +1099,13 @@
 	EmptyPropertyKey,
 }
 
+/// Token owner error: it could be either `NotFound` ot `MultipleOwners`.
+#[derive(Debug)]
+pub enum TokenOwnerError {
+	NotFound,
+	MultipleOwners,
+}
+
 /// Marker for scope of property.
 ///
 /// Scoped property can't be changed by user. Used for external collections.
modifiedruntime/common/runtime_apis.rsdiffbeforeafterboth
--- a/runtime/common/runtime_apis.rs
+++ b/runtime/common/runtime_apis.rs
@@ -16,11 +16,11 @@
 
 #[macro_export]
 macro_rules! dispatch_unique_runtime {
-	($collection:ident.$method:ident($($name:ident),*)) => {{
+	($collection:ident.$method:ident($($name:ident),*) $($rest:tt)*) => {{
 		let collection = <Runtime as pallet_common::Config>::CollectionDispatch::dispatch(<pallet_common::CollectionHandle<Runtime>>::try_get($collection)?);
 		let dispatch = collection.as_dyn();
 
-		Ok::<_, DispatchError>(dispatch.$method($($name),*))
+		Ok::<_, DispatchError>(dispatch.$method($($name),*) $($rest)*)
 	}};
 }
 
@@ -73,7 +73,7 @@
                 }
 
                 fn token_owner(collection: CollectionId, token: TokenId) -> Result<Option<CrossAccountId>, DispatchError> {
-                    dispatch_unique_runtime!(collection.token_owner(token))
+                    dispatch_unique_runtime!(collection.token_owner(token).ok())
                 }
 
                 fn token_owners(collection: CollectionId, token: TokenId) -> Result<Vec::<CrossAccountId>, DispatchError>  {
@@ -83,7 +83,7 @@
                 fn topmost_token_owner(collection: CollectionId, token: TokenId) -> Result<Option<CrossAccountId>, DispatchError> {
                     let budget = up_data_structs::budget::Value::new(10);
 
-                    Ok(Some(<pallet_structure::Pallet<Runtime>>::find_topmost_owner(collection, token, &budget)?))
+                    Ok(<pallet_structure::Pallet<Runtime>>::find_topmost_owner(collection, token, &budget)?)
                 }
                 fn token_children(collection: CollectionId, token: TokenId) -> Result<Vec<TokenChild>, DispatchError> {
                     Ok(<pallet_nonfungible::Pallet<Runtime>>::token_children_ids(collection, token))
modifiedtests/src/nesting/nest.test.tsdiffbeforeafterboth
--- a/tests/src/nesting/nest.test.ts
+++ b/tests/src/nesting/nest.test.ts
@@ -15,7 +15,7 @@
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
 import {IKeyringPair} from '@polkadot/types/types';
-import {expect, itSub, usingPlaygrounds} from '../util';
+import {expect, itSub, Pallets, usingPlaygrounds} from '../util';
 
 describe('Integration Test: Composite nesting tests', () => {
   let alice: IKeyringPair;
@@ -138,7 +138,7 @@
   before(async () => {
     await usingPlaygrounds(async (helper, privateKey) => {
       const donor = await privateKey({filename: __filename});
-      [alice, bob, charlie] = await helper.arrange.createAccounts([50n, 10n, 10n], donor);
+      [alice, bob, charlie] = await helper.arrange.createAccounts([200n, 10n, 10n], donor);
     });
   });
 
@@ -288,6 +288,38 @@
     await collectionFT.transfer(charlie, targetToken.nestingAccount(), 2n);
     expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(7n);
   });
+
+  itSub.ifWithPallets('ReFungible: getTopmostOwner works correctly with Nesting', [Pallets.ReFungible], async({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {
+      permissions: {
+        nesting: {
+          tokenOwner: true,
+        },
+      },
+    });
+    const collectionRFT = await helper.rft.mintCollection(alice);
+
+    const nft = await collectionNFT.mintToken(alice, {Substrate: alice.address});
+    const rft = await collectionRFT.mintToken(alice, 100n, {Substrate: alice.address});
+
+    expect(await rft.getTopmostOwner()).deep.equal({Substrate: alice.address});
+
+    await rft.transfer(alice, nft.nestingAccount(), 40n);
+
+    expect(await rft.getTopmostOwner()).deep.equal(null);
+
+    await rft.transfer(alice, nft.nestingAccount(), 60n);
+
+    expect(await rft.getTopmostOwner()).deep.equal({Substrate: alice.address});
+
+    await rft.transferFrom(alice, nft.nestingAccount(), {Substrate: alice.address}, 30n);
+
+    expect(await rft.getTopmostOwner()).deep.equal(null);
+
+    await rft.transferFrom(alice, nft.nestingAccount(), {Substrate: alice.address}, 70n);
+
+    expect(await rft.getTopmostOwner()).deep.equal({Substrate: alice.address});
+  });
 });
 
 describe('Negative Test: Nesting', () => {