Extrinsic 3704-1

{
  "heartbeat": {
    "blockNumber": 3703,
    "sessionIndex": 61,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xf4d371d25c693de8838f31567f8a6a794dc0e02ea3f4a90ac5fa564d1056f334c9189a7324f631efdb2368b9ca22579da3928d24dbddf61b9b176a741ab23283"
}