Bridge app based on block header proofs

The repository contains two packages:

• bridge-app
  • App/Docker to run by validators to submit signed block hashes to the registry on Fuse
  • SDK to submit signed blocks and execute receipt proofs
• bridge-contracts
  • blockRegistry - a smart contract that emit events when Fuse validators submit signed block hashes
  • bridge - Smart contracts for building generic bridges using block header proofs