This is a follow up to [Referendum 46](https://polkadot.polkassembly.io/referendum/46), which failed because Polkadot did not have a default XCM version set. This protection, that the Relay Chain will not dispatch messages without a minimum safe version, was put in place after a previous vulnerability. Since this is the first cross-chain interaction that Polkadot has had, the version was not initialized.

The batch of calls contains the same two calls as Referendum 46, with an additional call to set the default XCM version of Polkadot to 2.

![](https://i.imgur.com/DLFYewu.png)
![](https://i.imgur.com/wJzxnkv.png)

 Schedule a majority-carries referendum to be tabled next once it is legal to schedule
 an external referendum.

 The dispatch of this call must be `ExternalMajorityOrigin`.

 - `proposal_hash`: The preimage hash of the proposal.

 Unlike `external_propose`, blacklisting has no effect on this and it may replace a
 pre-scheduled `external_propose` call.

 # <weight>
 - `O(1)`.
 - One DB change.
 # </weight>

- Problem Statement: The failure of Referendum 46 due to Polkadot not having a default XCM version set, affecting the first cross-chain interaction that Polkadot has had. The intended audience is the Polkadot community.
- Significance: The issue highlights a vulnerability in the Polkadot system, where the Relay Chain will not dispatch messages without a minimum safe version.
- Proposed Solution: The proposal includes the same two calls as Referendum 46, with an additional call to set the default XCM version of Polkadot to 2.
- Expected Outcomes: The successful implementation of this proposal will ensure the smooth operation of cross-chain interactions in Polkadot, enhancing the system's security and functionality.

#134 Upgrade Shell to Statemint (with XCM Fix)