Extrinsic 3768-1

{
  "heartbeat": {
    "blockNumber": 3767,
    "sessionIndex": 62,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x4471045cd968c3686b98cd3f7d626714a8b82f0a29885708428632c8675da20d532c54a51c2a329a10e925f5e542c64174f3d616415b6c787d009708125ab68f"
}