## TL:DR

This batched proposal is to Accept/Open an HRMP channel with Phala and to register the PHA token

## Summary

We propose to open a bi-directional channel between Moonbeam and Phala. Initially, the main use case will be to transfer GLMR and PHA between the two chains, but it can be further expanded to other use cases. The proposal also includes the PHA asset registration as xcPHA, with the following details:

 - Multilocation: *{ "parents": 1, "interior": {"X1": { "Parachain": 2035}}}*
 - Decimals: *12*
 - Name: *Phala*
 - Symbol: *xcPHA*

xcPHA will have the following asset ID and XC-20 address:
 
- Asset ID: 132685552157663328694213725410064821485
 - XC-20 address: 0xffffffff63d24ecc8eb8a7b5d0803e900f7b6ced

## Proposal

Proposal #3 with the following hash: *0x6fff38b4315c59f535240de8eff649ecb7edd1e226c12a992580420f0d7a9685*

## Technical details:

The procedure for opening the channels is as follows:

 - Phala: already proposed to open an HRMP channel to Moonbeam
 - Moonbeam: democracy batched proposal
     - Open Moonbeam to Phala HRMP channel
     - Accept Phala to Moonbeam HRMP channel
     - Register PHA asset as an XC-20 
 - Phala: democracy proposal to accept Moonbeam to Phala HRMP channel

Once the HRMP channels are ready, XCM based cross-chain transfer will be possible. The extrinsics that need to be executed on the relay chain, are:
 
- To open the HRMP channel from Moonbeam: *hrmp.hrmpInitOpenChannel(recipient: 2012, proposedMaxCapacity: 1000, proposedMaxMessageSize: 102400)*, which its hex-encoded call data is *0x3c00f3070000e803000000900100*
 - To accept this HRMP channel: *hrmp.hrmpAcceptOpenChannel(sender: 2012)*, which hex-encoded call data is *0x3c01f3070000*

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

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

The asset will be registered with the metadata described in the summary. The *setAssetUnitsPerSecond* was calculated using an estimated value for PHA on Aug 1st 2022, targeting a XCM transaction cost of 0.02$.

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:

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

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.

 

Send a batch of dispatch calls and atomically execute them.
The whole transaction will rollback and fail if any of the calls failed.

May be called from any origin.

- `calls`: The calls to be dispatched from the same origin. The number of call must not
  exceed the constant: `batched_calls_limit` (available in constant metadata).

If origin is root then call are dispatch without checking origin filter. (This includes
bypassing `frame_system::Config::BaseCallFilter`).

# <weight>
- Complexity: O(C) where C is the number of calls to be batched.
# </weight>

- This proposal is about opening a channel between Moonbeam and Phala.
- The channel will be used to transfer GLMR and PHA tokens between the two chains.
- The proposal also includes registering the PHA token as xcPHA with specific details.
- The proposal has a technical process involving extrinsics and a democracy proposal.
- The asset registration will require some DOT tokens as collateral and for execution fees.

#48 Open/Accept HRMP channel to/from Phala and Register PHA

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