## TL:DR
Similar to other HRPM channel proposals, we propose to **Accept** the HRMP channel between Bifrost (Kusama) and Moonriver. The previous proposal failed because Bifrost original proposal did not get properly executed in [Kusama](https://kusama.subscan.io/extrinsic/12100211-1?event=12100211-28).

## Summary
We propose to accept the HRMP channel from Bifrost to Moonriver. Initially, the main use case will be to transfer BNC from Bifrost to Moonriver, but it can be further expanded to other use cases.

## Proposal
Proposal #16 with the following hash: *0xb9a83527d40a4d28321346eb73e9ad5431d3cc82d7330a12fab098324f750f96*

## Technical details:
To accept the HRMP channel, we need to execute the acceptance in Kusama. The related extrinsics is:

*hrmp.hrmpAcceptOpenChannel(sender: 2001)*, which its hex-encoded call data is *0x3c01d1070000*

The *proposedMaxCapacity *and *proposedMaxMessageSize *are set to the values of Kusama’s *configuration.activeConfig.hrmpChannelMaxCapacity* and *configuration.activeConfig.hrmpChannelMaxMessageSize* values, respectively.

The extrinsic 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 both the hrmpAcceptOpenChannel [Moonriver](https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fwss.api.moonriver.moonbeam.network#/extrinsics/decode) is:

**Accept Channel:** 0x67000101000210000400000000070010a5d4e81300000000070010a5d4e8010700f2052a01060002286bee183c01d10700000d0100040001010070617261e7070000000000000000000000000000000000000000000000000000

As a prerequisite, the parachain’s sovereign account must contain at least ~5 KSM to be locked as collateral (for each channel direction), plus some KSM to pay for XCM execution fees.



 Set the new runtime code.

 # <weight>
 - `O(C + S)` where `C` length of `code` and `S` complexity of `can_set_code`
 - 1 storage write (codec `O(C)`).
 - 1 call to `can_set_code`: `O(S)` (calls `sp_io::misc::runtime_version` which is expensive).
 - 1 event.
 The weight of this function is dependent on the runtime, but generally this is very expensive.
 We will treat this as a full block.
 # </weight>

- Problem Statement: The previous proposal for the HRMP channel between Bifrost and Moonriver failed due to execution issues.
- Audience: Polkassembly members and stakeholders.
- Significance: Accepting the HRMP channel will allow for the transfer of BNC from Bifrost to Moonriver and potentially expand to other use cases.
- Proposed Solution: Accept the HRMP channel from Bifrost to Moonriver through a democracy proposal and execute the necessary extrinsics.
- Expected Outcomes: Successful acceptance of the HRMP channel, enabling the transfer of BNC and potential future use cases.

#81 Accept HRMP Channel from Bifrost to Moonriver