Extrinsic 3937-1

{
  "heartbeat": {
    "blockNumber": 3935,
    "sessionIndex": 65,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xec000985d0d9c80a40295dcceb04cbcb1ac57721cf0fe6a095965628eead387b16f30822e835762e66b7dd82c983a5fbdbaa59645b3639ca35a2552752190f89"
}