Extrinsic 31289-1

{
  "heartbeat": {
    "blockNumber": 31288,
    "sessionIndex": 521,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x4cb3c120459eceeaa9ebb269f066b54cce58389bc41d64d964217adbba8b4459c4ca98f4f84adcc172311245405f8cd43b2e118b54870c6042ec3401b7a7ca87"
}