Previous proposal fails because of wrong weight estimation, error fixed in this proposal.

The aim of this proposal is to open a bi-directional HRMP channel between Statemine and Shiden. Shiden’s parachain Id is 2007 and this is used in HRMP calls for channel opening.

Since previous call was unsuccessful due to incorrect max weight, we do not transfer funds for channel opening from Kusama treasury, only 1 KSM to cover the execution fees. Unused funds are returned back to the treasury.

1. Channel Init Open & Accept

Encoded call data for a batch call to

• accept channel opening from Shiden
• initiate channel opening with Shiden

0x1800083c01d70700003c00d7070000e803000000900100

This can be decoded on Kusama.

2. XCM from Statemine to Kusama

Encoded call data to send XCM message from Statemine to Kusama which will execute the aforementioned batch call.

0x1f000101000214000400000000070010a5d4e81300000000070010a5d4e800060003009435775c1800083c01d70700003c00d7070000e803000000900100140d010004000101006d6f646c70792f74727372790000000000000000000000000000000000000000

This can be decoded on Statemine.

Statemine will send a request to Kusama to open & accept channel opening as described in the 1st sub-chapter. Unused funds are refunded back to the treasury account.

3. XCM from Kusama to Statemine

The preimage hash for Kusama:

0x66cb3ecc23fd2ef262f8f451e4f0e0dfcfd2e276b3438dc800522df4863659db

Encoded call data: 0x1800080402006d6f646c70792f747273727900000000000000000000000000000000000000000070617261e8030000000000000000000000000000000000000000000000000000070010a5d4e8630001000100a10f0204060203009435779d011f000101000214000400000000070010a5d4e81300000000070010a5d4e800060003009435775c1800083c01d70700003c00d7070000e803000000900100140d010004000101006d6f646c70792f74727372790000000000000000000000000000000000000000

This can be decoded on Kusama and hash can be verified.

Kusama will send a XCM to Statemine in order to initiate the procedure described in second sub-chapter.