BAC-L3-DOT-109Polkadot
Bridges to external ecosystems
Connecting Polkadot to an ecosystem that does not share its security: what the bridge must verify itself, and at what cost.
- Level
- L3 — Infrastructure engineer
- Duration
- 4 h
- Track
- Polkadot
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Compare light-client bridges with multisig-committee bridges
- 02Identify a given bridge's trust assumption
- 03Assess the cost of verifying a foreign header
Guided lab
Follow a transfer across a test bridge and identify every trusted actor involved.
Independent lab
Map the trust assumptions of two production bridges and compare them in writing.
Security angle
Case study of a documented bridge incident: which assumption failed, and how it could have been detected.
Assessment
Trust map, assessed on the completeness of the actors identified.