Extrinsic 17867-1

{
  "heartbeat": {
    "blockNumber": 17866,
    "sessionIndex": 297,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x54554281e9c37ce8a94861c6229fa5ffc417bc0ddcf15f0c9dddcf43b2146157d61b0119f5a5565463eb8abd64f6bfeb38f1913a37be8d7a3fbb09c7b9e47785"
}