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https://github.com/pezkuwichain/pezkuwi-fellows.git
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Adrian Catangiu
89a79fc99f
This is a continuation of https://github.com/polkadot-fellows/xcm-format/pull/63 following the migration of XCM RFCs to this repo. # Summary This RFC proposes a new instruction that provides a way to initiate asset transfers which transfer multiple types (teleports, local-reserve, destination-reserve) of assets, on remote chains using XCM alone. 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. # Example usage ```rust // pay remote fees with ROCs let remote_fees = Some( AssetTransferFilter::ReserveWithdraw( AssetFilter::Wild(AllOf { id: rocs_id.into(), fun: WildFungibility::Fungible }) ) ); // XCM to be executed locally let xcm = Xcm::<penpal_runtime::RuntimeCall>(vec![ // Withdraw both ROCs and PENs from origin account WithdrawAsset(assets.clone().into()), // Execute the transfers while paying remote fees with ROCs InitiateAssetsTransfer { dest: local_asset_hub, assets: vec![ // ROCs are reserve-withdrawn on AHR ReserveWithdraw(rocs.into()), // PENs are teleported to AHR Teleport(pens.into()), ], remote_fees, remote_xcm: xcm_on_ahr, }, ]); ``` I also have a [proof-of-concept implementation](https://github.com/acatangiu/polkadot-sdk/blob/1738f8eebd33d87c9c09c7a6bcd7c42fc1a8aa9e/polkadot/xcm/xcm-executor/src/lib.rs#L717C4-L831C6) and a [proof-of-concept asset transfer test](https://github.com/acatangiu/polkadot-sdk/blob/1738f8eebd33d87c9c09c7a6bcd7c42fc1a8aa9e/cumulus/parachains/integration-tests/emulated/tests/bridges/bridge-hub-rococo/src/tests/asset_transfers.rs#L484C1-L489C60), transferring 2 different types of assets across 3 chains.
