[AHM] Nomination pools #562

ggwpez · 2025-01-27T16:10:50Z

To be merged into the AHM working branch.

Pallet Nomination Pools

The nomination pools pallet has 15 storage items of which 14 can be migrated without any translation.

Storage Values

All nine storage values are migrated as is in a single message.

Storage Maps

The BondedPools map needs translation for its commission logic. The Commission struct contains an absolute relay timestamp throttle_from and the commission change min_delay.
The translation for both happens upon arrival on the Asset Hub. Ideally, it would be done on the Relay chain side since we have more compute power there but it is not possible since the timestamp translation depends on the Relay number upon arrival on Asset Hub.

The timestamp is translated in rc_to_ah_timestamp and the min_delay is directly passed to RcToAhDelay.

The other five storage maps are migrated as it.

User Impact

Impact here is negligible and only for pool operators - not members:

Pool commission change rate (measured in blocks) could be decreased by one block.
Pool operators may be able to change the commission rate one block later than anticipated. This is due to the nature or translating blocks of two different blockchains which does not yield unambiguous results.
Does not require a CHANGELOG entry

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

…y-nom-pools

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

seadanda · 2025-01-28T09:35:36Z

pallets/rc-migrator/src/staking/nom_pools.md

+# Storage Maps
+
+The `BondedPools` map needs translation for its commission logic. The Commission struct contains an
+absolute relay timestamp


Is it not possible to rework this to continue using the RcBlockNumberProvider as a clock? Is it just because this hasn't been completed yet or is there a reason not to?

I dont see an open MR to do it, so I assume that it will be done in the future. Generally yes, it can very well use the relay block number (and should). We just work off the state of the SDK that we have for now.

Yea I'll get somebody on it. For these ones which haven't been completed yet but which are intended, I think you can write the migration and keep the number as is, but make a note and we can come back to it if it looks like the pallet won't be ready in time. Might save you a bit of time for these pallets where the mapping introduces some extra work

muharem · 2025-01-28T09:54:40Z

pallets/rc-migrator/src/proxy.md

 ## User Impact
 - Announcements need to be re-created
 - Proxies of type `Auction` are not migrated and need to be re-created on the Relay
+- Existing proxies on Asset Hub will now have more permissions and will be able to access the new pallets as well. For example, the `NonTransfer` proxy will also be able to use nomination pools. This may affect security assumptions of previously created proxies.


may be we rename NoTransfer? and we do not include new pallets under it?

I was thinking about something like NoTransferLegacy or so that is the same as on the Relay and then the normal NoTransfer (No or Non i dont mind).
Then we could translate the proxies in the exact same way and not increase their scope.

with a good documentation I think it will be good enough.

pallets/rc-migrator/src/lib.rs

muharem · 2025-01-28T10:06:28Z

pallets/ah-migrator/src/lib.rs

 			count_bad: u32,
 		},
+		/// Received a batch of `RcNomPoolsMessage` that we are going to integrate.
+		NomPoolsMessagesBatchReceived {


we getting more and more of these identical events. we probably also need similar on rc-migrator side. what if we create some general even with a pallet name as a fixed size string? not sure how convenient that would be.

Yea we could create a new enum that is called like PalletName or so and then use that inside. Just string is not enough because the front-end wont know the variants.

muharem · 2025-01-28T10:14:46Z

pallets/rc-migrator/src/staking/nom_pools.rs

+		let mut messages = Vec::new();
+
+		loop {
+			if weight_counter.try_consume(Weight::from_all(1)).is_err() {


for the rc weight counter we can just count for db operations here + transport

muharem · 2025-01-28T10:24:29Z

pallets/ah-migrator/src/staking/nom_pools.rs

+	/// - AH now: 75
+	/// - RC time point: 150
+	/// - Result: 75 + (150 - 100) / 2 = 100
+	pub fn rc_to_ah_timepoint(rc_timepoint: BlockNumberFor<T>) -> BlockNumberFor<T> {


for all real time sensitive timepoints I am gonna leave RC as a block provider and do not do the mapping. If it just for servicing, my plan is to keep the system block provider.

The nom pools pallet is not migrated to RC number provider yet, otherwise i would also prefer that.

it is in the list, so yes we did plan it
paritytech/polkadot-sdk#6297

Would be better to have it. But turning off the translation here is a two line change so am not too concerned about it.

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

A high-level look of the migration is this: <img width="1204" height="745" alt="Screenshot 2025-09-17 at 18 23 57" src="https://github.com/user-attachments/assets/1fb39ef8-5efa-4db2-81db-6dd775af3a39" /> You can see the main components being the `pallet_rc_migrator` and `pallet_ah_migrator`. The RC migrator pallet takes data out of the RC storage and enqueues it for AH through XCM::Transact calls to the AH migrator pallet. Each pallet on the RC side has a migrator module that handles the removal of the old data and creation of the messages for AH. AH then processes these messages through the MQ pallet and acknowledges back to RC that they were processed (not shown in the graphic). There is rate-limiting code in place to prevent it from overloading the DMP queue or Asset Hub. ## For Reviewers The review comments are being addressed in #915. We need eyes on the Core part that is described below. ## Core STM The main stage transitions look like this. The only manual part is the scheduling call by the fellowship that kicks off the procedure: * `Pending` wait for Fellowship to call `schedule_migration(when)` -> Scheduled * `Scheduled` waiting for scheduled block -> `WaitingForAH` * `WaitingForAH` AH replies that it is ready -> `WarmUp` * `WarmUp` waiting for warm-up end -> `Starting` * `Starting` doing some startup initialization -> `DataMigration` * `DataMigration` MAIN PART **all pallet migrations finish** -> `CoolOff` * `CoolOff` waiting for cool-off to end -> `SignalMigrationFinish` * `SignalMigrationFinish` send signal to AH that we are done -> `MigrationDone` * `MigrationDone` finished, unlock all Pallets. ### State Machine The core State Machine lives in the `RcMigrator` pallet in its `on_initialize`: https://github.com/polkadot-fellows/runtimes/blob/8ef1cc739d756b109dc93eaf3b9da00e3dcf1383/pallets/rc-migrator/src/lib.rs#L1338-L1342 On each block the Rc Migrator checks the current state and possibly progresses to the next one. It will only do a single state transition per block to reduce complexity of the code. Generally, there are three states per pallet (called [*stages*](https://github.com/polkadot-fellows/runtimes/blob/8ef1cc739d756b109dc93eaf3b9da00e3dcf1383/pallets/rc-migrator/src/lib.rs#L190-L389) in the code). Some pallets have more then three, but it is generally still a multiple of three and always follows the pattern of `PalletInit`, `PalletOngoing { cursor }`, `PalletDone`: https://github.com/polkadot-fellows/runtimes/blob/8ef1cc739d756b109dc93eaf3b9da00e3dcf1383/pallets/rc-migrator/src/lib.rs#L239-L244 Each pallet then has one migrator struct (eg. `MultisigMigrator<T>`) that migrates the storage items from the Relay side. It lives in the module of its name `rc-migrator/src/multisig.rs` respectively. Taking Multisigs as an example; you can find two functions in the migrator struct: `migrate_many` and `migrate_single`. The former one is from the [`PalletMigration` trait](https://github.com/polkadot-fellows/runtimes/blob/715dbb4455a127066d0118ce7a096c72200e1126/pallets/rc-migrator/src/types.rs#L209-L221). The `migrate_single` function is done by convention to keep the code readable. The `migrate_many` does the following: - Weight accounting for the RC side: Normal weight tracking to not have overtime RC blocks - Weight accounting for the AH side: Ensuring to not send messages that would take up too much weight on AH processing - Ensure that DMP messages are sensibly sized by using the `XcmBatchAndMeter` - Taking the data out from the Relay chain (deleting it) - Including the data into a DMP message and sending it towards AH ### AH Side The main logic on Asset Hub lives in the `AhMigrator` pallet. It contains at least one extrinsic per pallet to receive the incoming data from the RC. We are using extrinsics since RC is wrapping the data into XCM::Transacts: https://github.com/polkadot-fellows/runtimes/blob/9a20b12e22b019c1c0b15b9af897567a559e424c/pallets/ah-migrator/src/lib.rs#L650-L653 This calls into the [`multisig` module](https://github.com/polkadot-fellows/runtimes/blob/6b603ca47e5c49b3a898be3f8f6b078c424f42a0/pallets/ah-migrator/src/multisig.rs#L37) to integrate the data into the storage. Per convention we are emitting events for each item and the whole batch. The main task of the AH side is to integrate the data. In the example of the multisig it is special since we do not migrate the multisig, but only the reserved account which will be unreserved on AH. ## Messaging Logic The messaging is ACK based. The Relay sends message to Asset Hub up to a specified limit (50). The limit can be adjusted on the fly through a dedicated dispatchable call, restricted to Admin and Manager roles. The limit may be overstepped by the configured batch-size (10), so in total there should never be more than 60 DMPs queued. Each DMP is set to at most [50KB](https://github.com/polkadot-fellows/runtimes/blob/8ef1cc739d756b109dc93eaf3b9da00e3dcf1383/pallets/rc-migrator/src/lib.rs#L131). The Relay Chain migrator creates a query for each XCM data message using the XCM query–response primitives and attaches a response status request from Asset Hub to the message. The XCM executor on Asset Hub then sends back the response status for every message with such a request. The Relay migrator stores each data message sent to Asset Hub until it receives confirmation of successful processing. It also provides a dispatchable call, available only to Admin and Manager roles, to resend any unconfirmed messages. A bug that prevented certain messages from being accounted for during a particulat pallet migration caused the Westend AHM stall. The system was queuing too many DMPs, which forced WAH to author an overweight block while attempting to process them all at once. ## Call Filtering Pallet calls are filtered during the migration for three reasons: - prevent malicious users from spamming the chain with cheap TX and slowing down the migration - prevent users from sending many UMPs out of AH to clog up the UMP queue - prevent interference with pallets that are being migrated to avoid messing up their storage invariants Both RC and AH provide call filters for `Before`, `During` and `After` the migration. As you can see, most things are disabled during the migration on both chains. After the migration, Relay chain keeps pretty much everything disabled since it was now enabled on AH: - Before: RC everything enabled, AH all new pallets disabled (staking, gov etc) - During: RC mostly everything disabled, AH mostly everything disabled - After: RC mostly everything disabled (staking, gov etc), AH everything enabled (staking, gov etc) This is implemented by returning three bools, one for each phase: https://github.com/polkadot-fellows/runtimes/blob/88f4aaf62236fbee9cfb9183e44333bac45b1371/system-parachains/asset-hubs/asset-hub-polkadot/src/ah_migration/call_filter.rs#L81-L83 ## Testing and Dry-Runs https://github.com/paritytech/ahm-dryrun is the repository for testing infrastructure for AHM. As of now, the following is being tested there (as a part of "[AHM Flow (all steps)](https://github.com/paritytech/ahm-dryrun/actions/workflows/zombie-bite.yml)" nightly action): * Dry-running a migration on a fork of Kusama * Re-running the rust unit tests introduced in this branch * Re-running a subset of the same tests, re-written in TS * Re-running PET tests. Each action produces a table with the summary of the test results: <img width="682" height="357" alt="Screenshot 2025-09-19 at 09 03 20" src="https://github.com/user-attachments/assets/69c1e37d-6f8f-4b57-b97f-75781a1e1a3a" /> And 4 snapshot files (2 real databases, 2 try-runtime snapshots) which can be used to re-run any of the tests, or run the pre/post migration chain, locally. <img width="1347" height="476" alt="Screenshot 2025-09-19 at 09 03 40" src="https://github.com/user-attachments/assets/127cbf76-b2fb-467f-8fef-3e93a9a709f6" /> <details><summary>Full Changelog</summary> <p> - **[AHM] OpenGov for Kusama AH (#877)** - **Relay Chain Accounts to Asset Hub Migration (#515)** - **Test Relay<->AH migration through DMP messages (#528)** - **[AHM] Improve account migration (#532)** - **[AHM] Add multisig migration (#534)** - **[AHM] Proxy migration (#542)** - **[AHM] Cleanup and add Preimage doc (#543)** - **[AHM] Improve accounts migration (#550)** - **[AHM] Preimage migration (#545)** - **[AHM] Add Polkadot call filtering (#559)** - **[AHM] Nomination pools (#562)** - **[AHM] referenda pallet (#558)** - **[AHM] Cleanup (#565)** - **[AHM] Scheduler Pallet (#569)** - **[AHM] Fast unstake and Bags list (#563)** - **[AHM] Pallet claims (#570)** - **[AHM] Conviction Voting Pallet (#578)** - **[AHM] Pallet Indices (#577)** - **[AHM] pause scheduler during migration (#580)** - **[AHM] Asset rate pallet migration (#581)** - **[AHM] Bounties data migration (#585)** - **[AHM] Vesting (#575)** - **[AHM] fix the rc-migrator call filter (#598)** - **[AHM] Sovereign Account Translation (#594)** - **[AHM] Crowdloans (#592)** - **[AHM] Set up AH migration testing framework for single pallets (#597)** - **[AHM] Stage management (#584)** - **[AHM] Do not pause inherents 🙈 (#609)** - **[AHM] Relay Chain accounts' reserves (#602)** - **[AHM] Benchmarks (#589)** - **[AHM] Pallet testing framework (#612)** - **[AHM] fix xcm weight at most (#617)** - **[AHM] Improve weight accounting for accounts migration (#618)** - **[AHM] AH acks messages from RC (#620)** - **[AHM] Pure Proxy Investigation (#621)** - **[AHM] Remove migrated items for pallet preimage and improve testing (#619)** - **[AHM] Referenda metadata (#633)** - **[AHM] Fix accounts migration failures (#628)** - **[AHM] refactor events and enable scheduled migration start (#634)** - **[AHM] Migrating DOT total issuance tracking from RC to AH (#607)** - **[AHM] Comment faulty checks out (#640)** - **Account migrator refactor (#639)** - **[AHM] Rebase (#641)** - **[AHM] Run AHM test in CI (#642)** - **[AHM] Vesting test (#615)** - **[AHM] bags_list and conviction_voting tests (#632)** - **[AHM] Treasury pallet migration (#624)** - **[AHM] Fix tests for pallet preimage (#643)** - **[AHM] Test Coverage Report (#650)** - **[AHM] deactivate/reactivate total issuance & weights (#648)** - **[AHM] add sudo behind feature flag (#657)** - **[AHM] fast_unstake tests (#658)** - **[AHM] asset_rate test (#660)** - **[AHM] Pallet treasury tests (#664)** - **[AHM] Improve account balances integration tests (#655)** - **[AHM] Integrate AH migrator weights to RC (#665)** - **Testing for bounties migration (#669)** - **[AHM] Westend port adapters (#652)** - **[AHM] fix checking account and total issuance migration (#636)** - **[AHM] Bump polkadot relay and AH versions (#667)** - **[AHM] Fix tests for pallet treasury (#671)** - **[AHM] Claims and Crowdloan tests (#622)** - **[AHM] Benchmarks (#663)** - **[AHM] Add Asset Hub CallFilter (#670)** - **[AHM] Westend staking migration (#689)** - **[AHM] Referenda migration storage checks (#672)** - **[AHM] AH benchmarks cleanup (#690)** - **[AHM] Westend Async Staking Migration (#691)** - **[AHM] Relay Chain migrator benchmarks (#692)** - **[AHM] Asset Hub ops pallet benchmarks (#693)** - **[AHM] Xcm send weights and Batch helper types (#694)** - **Finish staking Westend (#695)** - **[AHM] Account provider/consumer references (#702)** - **[AHM] Fix westend builds (#704)** - **[AHM] Generate weights (#706)** - **[AHM] Proxy fixes and more tests (#707)** - **[AHM] Docs and simpler events (#699)** - **[AHM] Test call decoding (#710)** - **[AHM] Emulated test for migration with async backing (#717)** - **[AHM] Increase test coverage (#720)** - **[AHM] Add referenda checks to Westend migration (#713)** - **[AHM] Nom_pools test (#677)** - **[AHM] Scheduler storage item checks (#680)** - **[AHM] Update Polkadot Snapshot (#725)** - **[AHM] Pallet multisig tests (#666)** - **[AHM] Adapt XCM configuration to account for changes before and after migration (#722)** - **[AHM] document checking account migration (#716)** - **[AHM] Dependency fixes for integration tests and the Polkadot runtime (#751)** - **[AHM] Remove empty conviction voting filter (#750)** - **[AHM] Missing TODOs and `AccountState` type update (#742)** - **[AHM] DMP prioritization on AH (#772)** - **[AHM] Disable #[pallet::hooks] for migrating pallets during migration (#784)** - **[AHM] AH messages prioritization on RC (#787)** - **[AHM] Cache test snapshots and include more tests into CI job (#788)** - **[AHM] Cleanup Westend feature (#789)** - **[AHM] Introducing the Cool-Off stage (#786)** - **[AHM] Flow Control System (#780)** - **[AHM] Migrate pallet delegated-staking to AH (#791)** - **[AHM] Merge master into dev branch (#793)** - **[AHM] Disable indirect XCMs from RC to AH and vice versa during migration (#774)** - **Rebase** - **bring back RelayTreasuryLocation to make old tests compiole** - **[AHM] Missing `RootLocation` for WaivedLocation for AHP (#798)** - **[AHM] Missing `SecretaryEntities` for AHP (#797)** - **[AHM] Migration idempotency (#808)** - **[AHM] Block number providers for migrating pallets (#809)** - **[AHM] Copy latest ah-ops pallet from the SDK (#810)** - **[AHM / ah-migrator]: Implement RC->AH account translation `mocked` migration across all involved pallets (#807)** - **[AHM] Complete account balances tests (#674)** - **[AHM] Address TODOs (#815)** - **[AHM] Async staking config (#812)** - **[AHM] Optional migration manager account id (#818)** - **[AHM] Type safe Hold and Freeze-Reason translation (#819)** - **[AHM] Create new response query on resend and tests (#816)** - **PolkadotAssetHub: Enable Async Backing (#763)** - **Ensure no era planned when migration starts (#728)** - **[AHM] with async backing (#822)** - **[AHM] Staking migration (#821)** - **identify with only validator account** - **[AHM] Tests work for Paseo (#827)** - **[AHM] Child bounties (#613)** - **[AHM] Cleanup and linter fixes (#828)** - **[AHM] Fix snowbridge test - wrong import of `RelayTreasuryPalletAccount` (instead of AH, it should be BH) (#831)** - **[AHM] Account Translation mapping (#829)** - **Fast unstake: remove alias** - **fmt** - **[AHM] Max migrated items per block (#834)** - **[AHM] Record migration timings (#835)** - **[AHM] Remove storage aliases and cleanup (#832)** - **[AHM] fix Kusama bags list pallet benchmarks (#836)** - **[AHM] Unprocessed msg buffer size 50 (#839)** - **[AHM] Post migration cool off stage (#841)** - **[AHM] Multisig test and storage_alias cleanup (#842)** - **[AHM] Remove fast-unstake and test fixes (#846)** - **Run try-state check for all pallets post AHM rust tests (#833)** - **[AHM] Preserve on RC manager' account (#843)** - **[AHM] Filter staking calls before migration starts (#847)** - **[AHM] State Decode Tests (#848)** - **[AHM] Send xcm extrinsic within migrator pallets (#851)** - **Merge and cleanup merge commit** - #845 - #852 - #862 - #875 - #872 - #877 - #626 - #879 - #885 - #886 - #882 - #883 - #854 - #888 - #895 - #892 - #896 - #889 </p> </details> // only to let all CIs to execute for now - [ ] Does not require a CHANGELOG entry --------- Signed-off-by: Oliver Tale-Yazdi <[email protected]> Signed-off-by: Adrian Catangiu <[email protected]> Signed-off-by: Andrei Sandu <[email protected]> Signed-off-by: Alexandru Vasile <[email protected]> Co-authored-by: Muharem <[email protected]> Co-authored-by: Dónal Murray <[email protected]> Co-authored-by: Adrian Catangiu <[email protected]> Co-authored-by: Giuseppe Re <[email protected]> Co-authored-by: Andrii <[email protected]> Co-authored-by: Bastian Köcher <[email protected]> Co-authored-by: Yuri Volkov <[email protected]> Co-authored-by: s0me0ne-unkn0wn <[email protected]> Co-authored-by: Kian Paimani <[email protected]> Co-authored-by: Branislav Kontur <[email protected]> Co-authored-by: GitHub Action <[email protected]> Co-authored-by: Francisco Aguirre <[email protected]> Co-authored-by: fellowship-merge-bot[bot] <151052383+fellowship-merge-bot[bot]@users.noreply.github.com> Co-authored-by: Pablo Andrés Dorado Suárez <[email protected]> Co-authored-by: ordian <[email protected]> Co-authored-by: Alistair Singh <[email protected]> Co-authored-by: Sergej Sakac <[email protected]> Co-authored-by: Bastian Köcher <[email protected]> Co-authored-by: Serban Iorga <[email protected]> Co-authored-by: Xiliang Chen <[email protected]> Co-authored-by: Nikolai Kozlov <[email protected]> Co-authored-by: nkprt <[email protected]> Co-authored-by: Eugenio Paluello <[email protected]> Co-authored-by: Javier Viola <[email protected]> Co-authored-by: polka.dom <[email protected]> Co-authored-by: Dónal Murray <[email protected]> Co-authored-by: Karol Kokoszka <[email protected]> Co-authored-by: joe petrowski <[email protected]> Co-authored-by: Clara van Staden <[email protected]> Co-authored-by: Ankan <[email protected]> Co-authored-by: clangenb <[email protected]> Co-authored-by: Andrei Sandu <[email protected]> Co-authored-by: Andrei Sandu <[email protected]> Co-authored-by: Alexandre Baldé <[email protected]> Co-authored-by: Maksym H <[email protected]> Co-authored-by: Alin Dima <[email protected]> Co-authored-by: Alexander Theißen <[email protected]> Co-authored-by: Christian Langenbacher <[email protected]> Co-authored-by: Ankan <[email protected]> Co-authored-by: Karol Kokoszka <[email protected]> Co-authored-by: brenzi <[email protected]> Co-authored-by: Doordashcon <[email protected]> Co-authored-by: eskimor <[email protected]> Co-authored-by: Robert <[email protected]> Co-authored-by: Raymond Cheung <[email protected]> Co-authored-by: Maciej <[email protected]> Co-authored-by: Paolo La Camera <[email protected]> Co-authored-by: kianenigma <[email protected]> Co-authored-by: Alexandru Vasile <[email protected]> Co-authored-by: Alexander Cyon <[email protected]>

ggwpez added 11 commits January 24, 2025 13:31

[AHM] Nom pools

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Signed-off-by: Oliver Tale-Yazdi <[email protected]>

Migrate nom pools

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Merge remote-tracking branch 'origin/dev-asset-hub-migration' into ot…

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Signed-off-by: Oliver Tale-Yazdi <[email protected]>

Rename RcToProxyDelay

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Make infallible

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cleanup

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ggwpez marked this pull request as ready for review January 27, 2025 20:34

ggwpez added 4 commits January 27, 2025 21:38

fmt

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[AHM] Misc Issues paritytech/polkadot-sdk#7369

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ggwpez added 2 commits January 28, 2025 18:51

fixes

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ggwpez merged commit 5feaca0 into dev-asset-hub-migration Jan 28, 2025
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Asset Hub Migration: Pallet List ☂ #555

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THE ASSET HUB MIGRATION (Please Review) #856

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[AHM] Nomination pools #562

[AHM] Nomination pools #562

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Pallet Nomination Pools

Storage Values

Storage Maps

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ggwpez Jan 28, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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ggwpez commented Jan 27, 2025 •

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