- [Bridge-hub Parachains](#bridge-hub-parachains) - [Requirements for local run/testing](#requirements-for-local-runtesting) - [How to test local Rococo <-> Westend bridge](#how-to-test-local-rococo---westend-bridge) - [Run Rococo/Westend chains with zombienet](#run-rococowestend-chains-with-zombienet) - [Init bridge and run relayer between BridgeHubRococo and BridgeHubWestend](#init-bridge-and-run-relayer-between-bridgehubrococo-and-bridgehubwestend) - [Initialize configuration for transfer asset over bridge (ROCs/WNDs)](#initialize-configuration-for-transfer-asset-over-bridge-rocswnds) - [Send messages - transfer asset over bridge (ROCs/WNDs)](#send-messages---transfer-asset-over-bridge-rocswnds) - [Claim relayer's rewards on BridgeHubRococo and BridgeHubWestend](#claim-relayers-rewards-on-bridgehubrococo-and-bridgehubwestend) - [How to test local BridgeHubKusama/BridgeHubPolkadot](#how-to-test-local-bridgehubkusamabridgehubpolkadot) # Bridge-hub Parachains _BridgeHub(s)_ are **_system parachains_** that will house trustless bridges from the local ecosystem to others. The current trustless bridges planned for the BridgeHub(s) are: - `BridgeHubPolkadot` system parachain: 1. Polkadot <-> Kusama bridge 2. Polkadot <-> Ethereum bridge (Snowbridge) - `BridgeHubKusama` system parachain: 1. Kusama <-> Polkadot bridge 2. Kusama <-> Ethereum bridge The high-level responsibilities of each bridge living on BridgeHub: - sync finality proofs between relay chains (or equivalent) - sync finality proofs between BridgeHub parachains - pass (XCM) messages between different BridgeHub parachains ![](./docs/bridge-hub-parachain-design.jpg "Basic deployment setup") ## Requirements for local run/testing ``` # Prepare empty directory for testing mkdir -p ~/local_bridge_testing/bin mkdir -p ~/local_bridge_testing/logs --- # 1. Install zombienet Go to: https://github.com/paritytech/zombienet/releases Copy the appropriate binary (zombienet-linux) from the latest release to ~/local_bridge_testing/bin --- # 2. Build polkadot binary We need polkadot binary with "fast-runtime" feature: cd cargo build --release --features fast-runtime --bin polkadot cp target/release/polkadot ~/local_bridge_testing/bin/polkadot cargo build --release --features fast-runtime --bin polkadot-prepare-worker cp target/release/polkadot-prepare-worker ~/local_bridge_testing/bin/polkadot-prepare-worker cargo build --release --features fast-runtime --bin polkadot-execute-worker cp target/release/polkadot-execute-worker ~/local_bridge_testing/bin/polkadot-execute-worker --- # 3. Build substrate-relay binary git clone https://github.com/paritytech/parity-bridges-common.git cd parity-bridges-common # checkout desired branch or use master: # git checkout -b master --track origin/master # `polkadot-staging` (recommended) is stabilized and compatible for Cumulus releases # `master` is latest development git checkout -b polkadot-staging --track origin/polkadot-staging cargo build --release -p substrate-relay cp target/release/substrate-relay ~/local_bridge_testing/bin/substrate-relay --- # 4. Build cumulus polkadot-parachain binary cd cargo build --release -p polkadot-parachain-bin cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain-asset-hub ``` ## How to test local Rococo <-> Westend bridge ### Run Rococo/Westend chains with zombienet ``` cd # Rococo + BridgeHubRococo + AssetHub for Rococo (mirroring Kusama) POLKADOT_BINARY=~/local_bridge_testing/bin/polkadot \ POLKADOT_PARACHAIN_BINARY=~/local_bridge_testing/bin/polkadot-parachain \ ~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./bridges/testing/environments/rococo-westend/bridge_hub_rococo_local_network.toml ``` ``` cd # Westend + BridgeHubWestend + AssetHub for Westend (mirroring Polkadot) POLKADOT_BINARY=~/local_bridge_testing/bin/polkadot \ POLKADOT_PARACHAIN_BINARY=~/local_bridge_testing/bin/polkadot-parachain \ ~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./bridges/testing/environments/rococo-westend/bridge_hub_westend_local_network.toml ``` ### Init bridge and run relayer between BridgeHubRococo and BridgeHubWestend **Accounts of BridgeHub parachains:** - `Bob` is pallet owner of all bridge pallets #### Run with script ``` cd ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh run-relay ``` **Check relay-chain headers relaying:** - Rococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8943#/chainstate - Pallet: **bridgeWestendGrandpa** - Keys: **bestFinalized()** - Westend parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8945#/chainstate - Pallet: **bridgeRococoGrandpa** - Keys: **bestFinalized()** **Check parachain headers relaying:** - Rococo parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8943#/chainstate - Pallet: **bridgeWestendParachains** - Keys: **parasInfo(None)** - Westend parachain: - https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A8945#/chainstate - Pallet: **bridgeRococoParachains** - Keys: **parasInfo(None)** ### Initialize configuration for transfer asset over bridge (ROCs/WNDs) This initialization does several things: - creates `ForeignAssets` for wrappedROCs/wrappedWNDs - drips SA for AssetHubRococo on AssetHubWestend (and vice versa) which holds reserved assets on source chains ``` cd ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh init-asset-hub-rococo-local ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh init-bridge-hub-rococo-local ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh init-asset-hub-westend-local ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh init-bridge-hub-westend-local ``` ### Send messages - transfer asset over bridge (ROCs/WNDs) Do reserve-backed transfers: ``` cd # ROCs from Rococo's Asset Hub to Westend's. ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh reserve-transfer-assets-from-asset-hub-rococo-local ``` ``` cd # WNDs from Westend's Asset Hub to Rococo's. ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh reserve-transfer-assets-from-asset-hub-westend-local ``` - open explorers: (see zombienets) - AssetHubRococo (see events `xcmpQueue.XcmpMessageSent`, `polkadotXcm.Attempted`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:9910#/explorer - BridgeHubRococo (see `bridgeWestendMessages.MessageAccepted`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8943#/explorer - BridgeHubWestend (see `bridgeRococoMessages.MessagesReceived`, `xcmpQueue.XcmpMessageSent`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8945#/explorer - AssetHubWestend (see `foreignAssets.Issued`, `xcmpQueue.Success`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:9010#/explorer - BridgeHubRocococ (see `bridgeWestendMessages.MessagesDelivered`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8943#/explorer Do reserve withdraw transfers: (when previous is finished) ``` cd # wrappedWNDs from Rococo's Asset Hub to Westend's. ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh withdraw-reserve-assets-from-asset-hub-rococo-local ``` ``` cd # wrappedROCs from Westend's Asset Hub to Rococo's. ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh withdraw-reserve-assets-from-asset-hub-westend-local ``` ### Claim relayer's rewards on BridgeHubRococo and BridgeHubWestend **Accounts of BridgeHub parachains:** - `//Charlie` is relayer account on BridgeHubRococo - `//Charlie` is relayer account on BridgeHubWestend ``` cd # Claim rewards on BridgeHubWestend: ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh claim-rewards-bridge-hub-rococo-local # Claim rewards on BridgeHubWestend: ./bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh claim-rewards-bridge-hub-westend-local ``` - open explorers: (see zombienets) - BridgeHubRococo (see 2x `bridgeRelayers.RewardPaid`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8943#/explorer - BridgeHubWestend (see 2x `bridgeRelayers.RewardPaid`) https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:8945#/explorer ## How to test local BridgeHubKusama/BridgeHubPolkadot TODO: see `# !!! READ HERE` above