Extrinsic 16660-1

{
  "heartbeat": {
    "blockNumber": 16659,
    "sessionIndex": 277,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x8ea8125848eed472a55ee86ece8b4a58d2a8a97114423a1aa1b60d699233a7219c6985fb1604a5d2b9d559df8fe070aae89a66aa5b4573e5f63dde296c912c87"
}