---
# System prepended metadata

title: Polkadot Release Analysis v1.6.0

---

# Polkadot Release Analysis v1.6.0



:warning: ***The following report is not an exhaustive list of changes included in the release, but a set of changes that we felt deserved to be highlighted due to their impact on the Polkadot ecosystem builders.*** 

***Please do not stop reading the [release notes v1.6.0](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-v1.6.0). This report is complementary to the changelogs, not a replacement.*** 

***Highlights are categorized into High Impact, Medium Impact, and Low Impact for ease of navigation.***
***Also there is a section related to all note worthy changes related to tooling integration.***

[Help us improve the release analysis by filling out this 6 question survey.](https://forms.gle/mdneyTfvYDtXftaX9)


# Summary

In the following report we are featuring some of the changes included in the [polkadot node release 1.6.0](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-v1.6.0). All the runtime changes that are part of this release will be included in the [corresponding runtime release](https://github.com/polkadot-fellows/runtimes/releases) done by the polkadot technical fellowship.

    
### :hammer_and_wrench: Tooling Section
    
* Sidecar - [v17.4.0](https://github.com/paritytech/substrate-api-sidecar/releases/tag/v17.4.0)
* Txwrapper - [v7.2.0](https://github.com/paritytech/txwrapper-core/releases/tag/v7.2.0)
* PolkadotJS - [v10.11.2](https://github.com/polkadot-js/api/releases/tag/v10.11.2)
* AssetTransferApi - [v0.1.6](https://github.com/paritytech/asset-transfer-api/releases/tag/v0.1.6)

---

# ⚠️ Medium Impact

### [S,C] pallet-asset-conversion: Decoupling Native Currency Dependancy
PR:  https://github.com/paritytech/polkadot-sdk/pull/2031
    
**Why is this important?**

The changes in this PR enable `pallet-asset-conversion` to not be tied to the existance of a native currency. One of the reasons driving these changes is the ambition to create a more user-friendly API for the `SwapCredit` implementation. 
    
**How does this impact the Polkadot builders?**

The above mentioned pallet received changes on several types of its `Config` trait. Removal of certain errors and inclusion of new ones, with changes on their indices. And changes in function signatures of some of the calls, mainly due to the change of `MultiAssetId` to `AssetKind`.

Please, review the changes and update your runtime accordingly.
    
**Related PRs**
- [#1677 pallet-asset-conversion: Swap Credit](https://github.com/paritytech/polkadot-sdk/pull/1677)
- [#2033 UnionOf types for merged fungible and fungibles implementations](https://github.com/paritytech/polkadot-sdk/pull/2033)
- [#1876 Resolve Credit to Account impls of OnUnbalanced trait](https://github.com/paritytech/polkadot-sdk/pull/1876)

---
    
### [P,C] Rename `ExportGenesisStateCommand` to `ExportGenesisHeadCommand` and make it respect custom genesis block builders
PR: https://github.com/paritytech/polkadot-sdk/pull/2331
    
**Why is this important?**

The `export-genesis-state` subcommand is now called `export-gensis-head`, but `export-genesis-state` stays as an alias to not break any scripts.

Also, when requested for the genesis head like with the above mentioned subcommand, cumulus will now read the genesis block from the database instead of generating it on the fly independently of an existing database or not.

---
    
### [S,P] Staking: Add `deprecate_controller_batch` AdminOrigin call
PR: https://github.com/paritytech/polkadot-sdk/pull/1677
    
**Why is this important?**
    
Adds a new call `deprecate_controller_batch` which Updates a batch of controller accounts to their corresponding stash account if they are not the same.
    
**How does this impact the Polkadot builders?**

A new type is added to `pallet-staking` `Config` trait:

```rust
/// The maximum amount of controller accounts that can be deprecated in one call.
type MaxControllersInDeprecationBatch: Get<u32>;
```
    
`deprecate_controller_batch` has the call index `28` and its dispatch origin must be `T::AdminOrigin`.
    
---
    
### [S,P] pallet-vesting: Configurable block number provider
PR: https://github.com/paritytech/polkadot-sdk/pull/2403
    
**Why is this change interesting for builders?**
    
Adds `BlockNumberProvider` type to `pallet-vesting` `Config trait`, allowing for custom providers instead of hardcoding frame-system.

This is particularly useful for parachains wanting to use `cumulus_pallet_parachain_system::RelaychainDataProvider` with `pallet-vesting`.
    
---
    
### [S,C] Tasks: general system for recognizing and executing service work
PR: https://github.com/paritytech/polkadot-sdk/pull/1343
    
**Why is this important?**

This change includes means to describe a Task in the runtime together with its conditions of execution, so that offchain elements, as off-chain workers, the block builder or a script, can trigger this execution.
    
These facilitate the implementation of use cases as lazy migrations. 

**Why is this change interesting for builders?**
    
`#[pallet:tasks_experimental]` provides a convenient way to define such work items. It can be attached to an `impl` block inside a pallet, whose functions can then be annotated by the following attributes:
- `#[pallet::task_list]`: Define an iterator over the available work items for a task
- `#[pallet::task_condition]`: Define the conditions for a given work item to be valid
- `#[pallet::task_weight]`: Define the weight of a given work item
- `#[pallet::task_index]`: Define the index of a given work item

Each such function becomes a variant of the autogenerated enum `Task<T>` for this pallet. 
      All such enums are aggregated into a `RuntimeTask` by `construct_runtime`.    
    
**Code Snippets**
    
Please, find an [example here](https://github.com/paritytech/polkadot-sdk/tree/master/substrate/frame/examples/tasks).
    
---

# ℹ️ Low Impact

    
### [S] pallet-sudo: Accept `Root` origin as valid sudo
PR:  https://github.com/paritytech/polkadot-sdk/pull/2783
    
**Why is this important?**

Calls from [`pallet-sudo`](https://paritytech.github.io/polkadot-sdk/master/pallet_sudo/index.html) will now also accept the `Root` origin as valid `sudo` origin.

**How does this impact the Polkadot builders?**
    
This enhancement is useful for parachains that allow the relay chain as a superuser. It enables the relay chain to send an XCM message to initialize the sudo key.

---

### [S,P,C] Add Authorize Upgrade Pattern to Frame System
PR:  https://github.com/paritytech/polkadot-sdk/pull/2682
    
**Why is this important?**
    
Adds the `authorize_upgrade` -> `enact_authorized_upgrade` pattern to `frame-system`. This will be useful for upgrading bridged chains that are under the governance of Polkadot without passing entire runtime Wasm blobs over a bridge.
    
**How does this impact the Polkadot builders?**

- `enact_authorized_upgrade` has been changed to `apply_authorized_upgrade`.
- Left calls in `parachain-system` and marked as deprecated to prevent breaking the API. They
just call into the `frame-system` functions.
- Deprecated calls will be removed no earlier than June 2024.
- Updated `frame-system` benchmarks to v2 syntax.

---
    
### [S] [NPoS] Remove better solution threshold for unsigned submissions
PR: https://github.com/paritytech/polkadot-sdk/pull/2694

**Why is this important?**

The `pallet-election-provider-multiphase` constant `BetterUnsignedThreshold` is removed from its `Config` trait. Meaning that any solution submitted by the validator that is strictly better than the current queued solution would be accepted.
    
---
    
### [S,P,C] Add FungibleAdapter
PR: https://github.com/paritytech/polkadot-sdk/pull/2684
    
**How does this impact the Polkadot builders?**

[`CurrencyAdapter`](https://github.com/paritytech/polkadot-sdk/blob/master/polkadot/xcm/xcm-builder/src/currency_adapter.rs) is marked as deprecated, and [`FungibleAdapter`](https://github.com/paritytech/polkadot-sdk/blob/master/polkadot/xcm/xcm-builder/src/fungible_adapter.rs) is added. The substitution will be made in a future separate MR.
    
This change continues moving the code base away from the old `Currency` traits.
  
---
    
### [S] pallet-uniques: Move migration over to `VersionedMigration`
PR: https://github.com/paritytech/polkadot-sdk/pull/2687

**Why is this important?**

The migration from `pallet-uniques` `migrate_to_v1` is moved to [`MigrateV0ToV1`](https://github.com/paritytech/polkadot-sdk/blob/master/substrate/frame/uniques/src/migration.rs). Allowing for this new one to be used directly instead of having to create custom `OnRuntimeUpgrade` including the previous one.
    
---

Your friendly neighborhood Polkadot Release Analysis team, @alejandro @ayush.mishra @bruno