[P-K Bridge] BridgeHub Kusama & BridgeHub Polkadot parachains story (bridge active and live)

[bkontur]

Components

	BridgeHubKusama	BridgeHubPolkadot	substrate-relay
Code	Cumulus	Cumulus	Bridges
Live endpoint	polkadot-js-org	polkadot-js-org	TODO:
Logs	loki	loki	TODO:
Telemetry	here	here	TODO:
Monitoring	Grafana	Grafana	TODO:

Local testing

Check here

Going live / cutover and timeline for bridge

Because of asynchronous and disconnected governances for Polkadot vs Kusama, we want to allow bridge operations step-by-step in few iterations - to minimalize risk and avoid getting stuck or losing messages/assets. The end goal is to allow message transfer via bridge, only after both sides can operate and are ready to process incoming messages.

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5. Governance motion for BridgeHubKusama upgrade
6. Governance motion for BridgeHubPolkadot upgrade
7. Prepare deployment of (Parity) relayers [P-K Bridge] Relayer Deployment #2417

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8. Enact BridgeHubKusama runtime
9. New governance motion for BridgeHubKusama with calls:

• pallet_bridge_grandpa::Call::initialize - enables relaying Polkadot relaychain finality (which enables receiving extrinsics for other pallet_bridge_parachains + pallet_bridge_message)
• frame_system::Call::set_storage(DeliveryRewardInBalance)
• frame_system::Call::set_storage(RequiredStakeForStakeAndSlash)
• (optional - there is a possiblity to disable other pallets, e.g. disabled sending outbound messages)

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10. Enact BridgeHubPolkadot runtime
11. New governance motion for BridgeHubPolkadot with calls:

• pallet_bridge_grandpa::Call::initialize - enables relaying Kusama relaychain finality (which enables receiving extrinsics for other pallet_bridge_parachains + pallet_bridge_message)
• frame_system::Call::set_storage(DeliveryRewardInBalance)
• frame_system::Call::set_storage(RequiredStakeForStakeAndSlash)
• (optional - there is a possiblity to disable other pallets, e.g. disabled sending outbound messages)

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12. When 9. and 11. is done, start relayers (finality, parachains, messages)
13. At this point, Kusama <> Polkadot bridge is operational, can relay messages (at least we can verify finality relaying)

Going live / cutover and timeline for asset transfer via bridge use-case

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14. Review and merge Cumulus PR Transfer asset via bridge with pallet xcm cumulus#2762
15. Pass security audit for that PR

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16. Governance motion for AssetHubKusama upgrade
17. Governance motion for AssetHubPolkadot upgrade

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18. Enact AssetHubKusama runtime

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19. Enact AssetHubPolkadot runtime
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20. When 18. and 19. is done, at this point both sides (AssetHubKusama, AssetHubPolkadot) can receive and transfer assets DOTs/KSMs over bridge

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Note: HRMP channels between AssetHubs and BridgeHubs are already opened.
Note: Some governance calls can be added directly to runtime as Migrations/OnRuntimeUpgrade.
_Note: Creation of ForeignAssets for wrappedDOT/wrappedKSM will be done simultaneously: #2401

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Issues/TODOs:

• [P-K Bridge] Upgrade basic bridgeHub on Kusama with bridge specific pallets #1686
• [P-K Bridge] Upgrade basic bridgeHub on Polkadot with bridge specific pallets #1687
• [P-K Bridge] Add monitoring + alarms for BHP<>BHK #2419
• [P-K Bridge] Relayer Deployment #2417
• [P-K Bridge] AssetHubs - create wrapped/derivate representations for KSM/DOT #2401
• update all TODO: here for relayers stuff
• confirm final cutover and deployment step
• start security audit for PR Bridge hub kusama/polkadot runtime upgrade with bridging cumulus#2528
• start security audit for PR Transfer asset via bridge with pallet xcm cumulus#2762
• Check if it is possible to authorizeUpgrade / enactAuthrozedUpgrade + pallet_bridge_grandpa::Call::initialize as one Governance call, because initialize have to be called after enact

[bkontur]

Initial setup for Kusama is ready and all PRs are merged,
And will be deployed in coming release 9360 https://github.com/paritytech/devops/issues/2196

[Polkadot-Forum]

This issue has been mentioned on Polkadot Forum. There might be relevant details there:

https://forum.polkadot.network/t/polkadot-kusama-bridge/2971/2

[svyatonik]

I think we may close it, since the bridge is launched :)