The P<>K bridge charges user fees on originating Asset Hub, but it pays relayer rewards from AssetHubs' sovereign accounts on sibling BridgeHub parachains. These relayer rewards are a large part of the bridge's "operating costs".

For initial deployment, AssetHub's sovereign accounts on BridgeHubs should be pre-funded by treasury.

An initial 10100 DOT and 2030 KSM is proposed to be split among the relevant system chain sovereign accounts to provide initial bootstrap runway to the bridge.

This will only be an initial seed. As the bridge operates, it should cover operation costs (relayer fees) from the user fees paid on Asset Hub, and any unspent user fees ("bridge profits") are going to the treasury anyway, so in the longer term these funds are practically paid back (plus profits).

Exact system chain addresses being funded and amounts for each can be found here: https://github.com/polkadot-fellows/runtimes/issues/238

See [`Pallet::dispatch_whitelisted_call_with_preimage`].

- Problem Statement: PK bridge faces high operating costs due to relayer rewards paid from AssetHubs' sovereign accounts, impacting its sustainability.
- Significance: Pre-funding AssetHub's sovereign accounts on BridgeHubs with 10100 DOT and 2030 KSM aims to provide initial financial support to cover bridge operation costs.
- Proposed Solution: Pre-fund relevant system chain sovereign accounts to ensure the bridge's sustainability and cover operation costs from user fees.
- Expected Outcomes: Improved financial sustainability for the PK bridge by covering operation costs from user fees and potentially generating profits for the treasury in the long term.

#361 Fund system chains sovereign accounts on Kusama BridgeHub for Polkadot<>Kusama bridge