Extrinsic 1120-2

{
  "heartbeat": {
    "blockNumber": 1119,
    "sessionIndex": 18,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xd2b1bf38fa9aeadd3b5ee4b00768879ab5c2aa3c38515704ca736f1b2790222b8783718bca556236817f6e9ecc6f8b19078bd1efb52bbaf182d741a1e389de81"
}