## TL:DR

This proposal is to Open an HRMP channel with Statemint

## Summary

We propose to open a bi-directional channel between Moonbeam and Statemint. This will allow Statemint Assets to be moved to Moonbeam (and back).



## Proposal

Proposal #39 with the following hash: *0x2dc85227450e70df7fbf7af267e664a1846186c2724dc7e8172c80b72e146ed7*

## Technical details:

The procedure for opening the channels is as follows:
 - Moonbeam: proposal to open an HRMP channel to Statemint (this proposal)
 - Statemint: democracy batched proposal
    - Open Statemint to Moonbeam HRMP channel
    - Accept Moonbeam to Statemint HRMP channel
 - Moonbeam: democracy proposal to accept Statemint to Moonbeam HRMP channel (future proposaL)

Once the HRMP channels are ready, XCM based cross-chain transfer will be possible. The extrinsic that need to be executed on the relay chain, is:

 - To open the HRMP channel from Moonbeam: hrmp.hrmpInitOpenChannel(recipient: *1000*, proposedMaxCapacity: 1000, proposedMaxMessageSize: 102400), which its hex-encoded call data is *0x3c00d0070000e803000000900100*

These extrinsics need to be called from the parachain’s sovereign account as origin, via a democracy proposal. The proposal will use *polkadotXcm* pallet to send XCM message to the Relay Chain with the following items:
 - Withdraw asset: take funds out of the Sovereign Account of the origin parachain (in the relay chain) to a holding state
 - Buy execution: buys execution time from the relay chain, to execute the XCM message
 - Transact: provides the call data to be executed
 - Deposit asset (optional): refunds the leftover funds after the execution. If this is not provided, no refunds will be carried out

If you are interested, the hex-encoded call data for this proposal in [Moonbeam](https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fwss.api.moonbeam.network#/extrinsics/decode) is:

0x670001010002100004000000000700e40b540213000000000700e40b5402010700f2052a01060002286bee383c00e8030000e8030000009001000d0100040001010070617261d4070000000000000000000000000000000000000000000000000000

As a prerequisite, the parachain’s sovereign account must contain at least 20 DOT to be locked as collateral (10 for each channel direction), plus some DOT to pay for XCM execution fees.

- This proposal is about opening a channel between Moonbeam and Statemint.
- The channel will allow assets to be moved between Moonbeam and Statemint.
- There are technical details and procedures involved in opening the channel.
- The proposal will use a democracy proposal to send messages between the two chains.
- Some DOT tokens are needed for collateral and fees.

#39 Open HRMP channel to Statemint