Extrinsic 4180-1

{
  "heartbeat": {
    "blockNumber": 4179,
    "sessionIndex": 69,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xb8f2dfe0d154de046ac9fdea784e2bd2b4753c8a8d8026257ae611507be2e474d157388b24301d224fbd9203d4361b7b9194f212ed412091b95f21b7b3e19a8d"
}