So far, five parachains have requested an HRMP channel with Statemint. This motion accepts them all and opens return channels.

Opening Notes

Handy Info

• Treasury Address: 13UVJyLnbVp9RBZYFwFGyDvVd1y27Tt8tkntv6Q7JVPhFsTB
• Treasury AccountId: 0x6d6f646c70792f74727372790000000000000000000000000000000000000000
• Statemint Address: 13YMK2edbuhwMBxeUWm9c643A2wyYHwSVh1bCM7tShtg7Dtk
• Statemint AccountId: 0x70617261e8030000000000000000000000000000000000000000000000000000

Parachains that want channels

• 2011
• 2000
• 2004
• 2006
• 2012

Channel Config

• maxCapacity: 1,000
• maxTotalSize: 102,400

HRMP Config

• hrmpSenderDeposit: 100,000,000,000
• hrmpRecipientDeposit: 100,000,000,000

Call Construction

These are constructed backwards. That is, the call to use as the proposal is at the end.

Relay Chain Call to Execute

First, we need the call that Statemint will execute on the Relay Chain. This accepts all channel requests and returns channel requests to the initiators.

Encoded Call Data:

0x1a02283c01db0700003c01d00700003c01d40700003c01d60700003c01dc0700003c00db070000e8030000009001003c00d0070000e8030000009001003c00d4070000e8030000009001003c00d6070000e8030000009001003c00dc070000e803000000900100

Message from Statemint

The above message needs to come from Statemint. So we put it into an XCM (the "Transact" instruction) along with purchasing some execution capacity and returning any leftover fees to the Treasury.

Encoded Call Data:

0x1f0001010002140004000000000700c817a80413000000000700c817a80400060002286bee9d011a02283c01db0700003c01d00700003c01d40700003c01d60700003c01dc0700003c00db070000e8030000009001003c00d0070000e8030000009001003c00d4070000e8030000009001003c00d6070000e8030000009001003c00dc070000e803000000900100140d01010000000004000101006d6f646c70792f74727372790000000000000000000000000000000000000000

Proposal on the Relay Chain

But, governance is on the Relay Chain, not Statemint. So take some DOT from the Treasury (100 DOT for 10 channels at 10 DOT each plus 2 DOT for fees) and send a message to Statemint telling it to send a message back. This is the proposal to vote on.

Encoded Call Data:

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

Call Hash:

0x6306b068f6a71eb1db5abd9609a0ffbbe7c441c9144ecf8a49e7c2bc19f7f6e9

Appendix: Relevant Storage Items

configuration.activeConfig: PolkadotRuntimeParachainsConfigurationHostConfiguration

{
  maxCodeSize: 10,485,760
  maxHeadDataSize: 20,480
  maxUpwardQueueCount: 10
  maxUpwardQueueSize: 51,200
  maxUpwardMessageSize: 51,200
  maxUpwardMessageNumPerCandidate: 10
  hrmpMaxMessageNumPerCandidate: 10
  validationUpgradeCooldown: 14,400
  validationUpgradeDelay: 600
  maxPovSize: 5,242,880
  maxDownwardMessageSize: 51,200
  umpServiceTotalWeight: 100,000,000,000
  hrmpMaxParachainOutboundChannels: 10
  hrmpMaxParathreadOutboundChannels: 0
  hrmpSenderDeposit: 100,000,000,000
  hrmpRecipientDeposit: 100,000,000,000
  hrmpChannelMaxCapacity: 1,000
  hrmpChannelMaxTotalSize: 102,400
  hrmpMaxParachainInboundChannels: 10
  hrmpMaxParathreadInboundChannels: 0
  hrmpChannelMaxMessageSize: 102,400
  codeRetentionPeriod: 14,400
  parathreadCores: 0
  parathreadRetries: 0
  groupRotationFrequency: 10
  chainAvailabilityPeriod: 10
  threadAvailabilityPeriod: 10
  schedulingLookahead: 1
  maxValidatorsPerCore: 5
  maxValidators: 200
  disputePeriod: 6
  disputePostConclusionAcceptancePeriod: 600
  disputeMaxSpamSlots: 2
  disputeConclusionByTimeOutPeriod: 600
  noShowSlots: 2
  nDelayTranches: 89
  zerothDelayTrancheWidth: 0
  neededApprovals: 30
  relayVrfModuloSamples: 40
  umpMaxIndividualWeight: 20,000,000,000
  pvfCheckingEnabled: false
  pvfVotingTtl: 2
  minimumValidationUpgradeDelay: 20
}

hrmp.hrmpOpenChannelRequests: Option<PolkadotRuntimeParachainsHrmpHrmpOpenChannelRequest>

[
  [
    [
      {
        sender: 2,011
        recipient: 1,000
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,000
        recipient: 2,035
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,000
        recipient: 2,034
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,000
        recipient: 2,032
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,012
        recipient: 2,000
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,000
        recipient: 1,000
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,004
        recipient: 1,000
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,006
        recipient: 1,000
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
  [
    [
      {
        sender: 2,012
        recipient: 1,000
      }
    ]
    {
      confirmed: false
      age: 0
      senderDeposit: 100,000,000,000
      maxMessageSize: 102,400
      maxCapacity: 1,000
      maxTotalSize: 102,400
    }
  ]
]