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

Already whitelisted by https://collectives.subsquare.io/fellowship/referenda/88

See [`Pallet::dispatch_whitelisted_call_with_preimage`].

- **Problem Statement:** Bridge operating costs are currently covered by relayer rewards from sovereign accounts, impacting the bridge's financial sustainability.
- **Significance:** Pre-funding AssetHub's sovereign accounts on BridgeHubs with 10100 DOT and 2030 KSM will provide an initial bootstrap runway to cover operating costs.
- **Proposed Solution:** Initial funding split among relevant system chain sovereign accounts to support the bridge's financial sustainability.
- **Expected Outcomes:** Bridge will cover operation costs from user fees, ensuring long-term financial sustainability and potential profits for the treasury.

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

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