Extrinsic 28779-1

{
  "heartbeat": {
    "blockNumber": 28778,
    "sessionIndex": 479,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xc840e9353c9ff191cfe724425974723acd260805821111e13afa5195f5b15c4a8f60a5814856dda7e1e3ea90f7b8d89082a7c3c4a8f5ce9c58734e492005c68b"
}