Bridge security improvements

Following tasks will be accomplished:

  • Enable 3 out of 4 validator setup with 2 harmony validators and 2 externals, such that no single entity can control the bridge. upgrade planned b/w apr 18-22
  • Work with external validators to provide 24/7 service (better incentives and monitoring)
  • Revisit validator setup for security assessment & improve the configuration & setup.

3-out-of-4 validators, 100% external validators, monitoring