Extrinsic 4721-1

{
  "heartbeat": {
    "blockNumber": 4719,
    "sessionIndex": 78,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xcc2db3ca05abcc22c17edd5052b409bc796159de5fee14eab938cae724449627502ce141e3d948488dd796a7861919f0372b87497aa67e11c424992765ed6181"
}