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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

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 apropriate binary (zombienet-linux) from the latest release to ~/local_bridge_testing/bin

---
# 2. Build polkadot binary
git clone https://github.com/paritytech/polkadot.git
cd polkadot

# if you want to test Kusama/Polkadot bridge, we need "sudo pallet + fast-runtime",
# so please, find the latest polkadot's repository branch `it/release-vX.Y.Z-fast-sudo`
# e.g:
# git checkout -b it/release-v0.9.42-fast-sudo --track origin/it/release-v0.9.42-fast-sudo

cargo build --release --features fast-runtime
cp target/release/polkadot ~/local_bridge_testing/bin/polkadot

---
# 3. Build cumulus polkadot-parachain binary
cd <cumulus-git-repo-dir>

# checkout desired branch or use master:
# git checkout -b master --track origin/master

cargo build --release --locked -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-mint

---
# 4. 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
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

---
# 5. Build polkadot-parachain-mint binary with `asset-hub-kusama`/`asset-hub-westend` for moving assets
cd <cumulus-git-repo-dir>
# TODO:check-parameter - change this when merged to master
git checkout -b bko-transfer-asset-via-bridge --track origin/bko-transfer-asset-via-bridge
cargo build --release --locked -p polkadot-parachain-bin
cp target/release/polkadot-parachain ~/local_bridge_testing/bin/polkadot-parachain-mint

How to test locally Rococo <-> Wococo bridge

Run chains (Rococo + BridgeHub, Wococo + BridgeHub) with zombienet

# Rococo + BridgeHubRococo + Rockmine (mirroring Kusama)
POLKADOT_BINARY_PATH=~/local_bridge_testing/bin/polkadot \
POLKADOT_PARACHAIN_BINARY_PATH=~/local_bridge_testing/bin/polkadot-parachain \
POLKADOT_PARACHAIN_BINARY_PATH_FOR_ROCKMINE=~/local_bridge_testing/bin/polkadot-parachain-mint \
	~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./zombienet/bridge-hubs/bridge_hub_rococo_local_network.toml

# Wococo + BridgeHubWococo + Wockmint (mirroring Polkadot)
POLKADOT_BINARY_PATH=~/local_bridge_testing/bin/polkadot \
POLKADOT_PARACHAIN_BINARY_PATH=~/local_bridge_testing/bin/polkadot-parachain \
POLKADOT_PARACHAIN_BINARY_PATH_FOR_WOCKMINT=~/local_bridge_testing/bin/polkadot-parachain-mint \
	~/local_bridge_testing/bin/zombienet-linux --provider native spawn ./zombienet/bridge-hubs/bridge_hub_wococo_local_network.toml

Run relayer (BridgeHubRococo, BridgeHubWococo)

Accounts of BridgeHub parachains:

  • Bob is pallet owner of all bridge pallets

Run with script (alternative 1)

cd <cumulus-git-repo-dir>
./scripts/bridges_rococo_wococo.sh run-relay

Run with binary (alternative 2)

Need to wait for parachain activation (start producing blocks), then run:

# 1. Init bridges:

# Rococo -> Wococo
RUST_LOG=runtime=trace,rpc=trace,bridge=trace \
	~/local_bridge_testing/bin/substrate-relay init-bridge rococo-to-bridge-hub-wococo \
	--source-host localhost \
	--source-port 9942 \
	--source-version-mode Auto \
	--target-host localhost \
	--target-port 8945 \
	--target-version-mode Auto \
	--target-signer //Bob

# Wococo -> Rococo
RUST_LOG=runtime=trace,rpc=trace,bridge=trace \
	~/local_bridge_testing/bin/substrate-relay init-bridge wococo-to-bridge-hub-rococo \
	--source-host localhost \
	--source-port 9945 \
	--source-version-mode Auto \
	--target-host localhost \
	--target-port 8943 \
	--target-version-mode Auto \
	--target-signer //Bob

# 2. Relay relay-chain headers, parachain headers and messages**
RUST_LOG=runtime=trace,rpc=trace,bridge=trace \
    ~/local_bridge_testing/bin/substrate-relay relay-headers-and-messages bridge-hub-rococo-bridge-hub-wococo \
    --rococo-host localhost \
    --rococo-port 9942 \
    --rococo-version-mode Auto \
    --bridge-hub-rococo-host localhost \
    --bridge-hub-rococo-port 8943 \
    --bridge-hub-rococo-version-mode Auto \
    --bridge-hub-rococo-signer //Charlie \
    --wococo-headers-to-bridge-hub-rococo-signer //Bob \
    --wococo-parachains-to-bridge-hub-rococo-signer //Bob \
    --bridge-hub-rococo-transactions-mortality 4 \
    --wococo-host localhost \
    --wococo-port 9945 \
    --wococo-version-mode Auto \
    --bridge-hub-wococo-host localhost \
    --bridge-hub-wococo-port 8945 \
    --bridge-hub-wococo-version-mode Auto \
    --bridge-hub-wococo-signer //Charlie \
    --rococo-headers-to-bridge-hub-wococo-signer //Bob \
    --rococo-parachains-to-bridge-hub-wococo-signer //Bob \
    --bridge-hub-wococo-transactions-mortality 4 \
    --lane 00000001

Check relay-chain headers relaying:

Check parachain headers relaying:

Send messages

Local zombienet run

  1. allow bridge transfer on kusama/westend asset hubs (governance-like):

    ./scripts/bridges_rococo_wococo.sh allow-transfers-local

  2. do (asset) transfer from kusama's asset hub to westend's asset hub:

    ./scripts/bridges_rococo_wococo.sh transfer-asset-from-asset-hub-kusama-local

  3. do (ping) transfer from kusama's asset hub to westend's asset hub

    ./scripts/bridges_rococo_wococo.sh ping-via-bridge-from-asset-hub-kusama-local

Live Rockmine2 to Wockmint

How to test local BridgeHubKusama

cd <base-cumulus-repo-directory>
cargo build --release -p polkadot-parachain-bin

# script expect to have pre-built polkadot binary on the path: ../polkadot/target/release/polkadot
# if using `kusama-local` / `polkadot-local`, build polkadot with `--features fast-runtime`

# BridgeHubKusama
zombienet-linux --provider native spawn ./zombienet/examples/bridge_hub_kusama_local_network.toml

or

# BridgeHubPolkadot
zombienet-linux --provider native spawn ./zombienet/examples/bridge_hub_polkadot_local_network.toml

How to test local BridgeHubPolkadot

TODO: from master