Support XCM complex asset transfers

[acatangiu]

Is there an existing issue?

• I have searched the existing issues

Experiencing problems? Have you tried our Stack Exchange first?

• This is not a support question.

Motivation

The currently existing instructions are too opinionated and force each XCM asset transfer to a single transfer type (teleport, local-reserve, destination-reserve). This results in inability to combine different types of transfers in single transfer which results in overall poor UX when trying to move assets across chains.

Request

Create a proof of concept for polkadot-fellows/xcm-format#54

Solution

• Implement RFC: add complex asset transfers instructions polkadot-fellows/xcm-format#54
• Integrate with pallet-xcm
• add complex asset transfer tests

Are you willing to help with this request?

Yes!

[acatangiu]

I created a proof-of-concept implementation and a proof-of-concept asset transfer test, transferring 2 different types of assets across 3 chains.

Or you can explore the commits on https://github.com/acatangiu/polkadot-sdk/tree/poc-xcm-transfer-assets-instruction

[acatangiu]

fixed in #4260