Extrinsic 18929-1

{
  "heartbeat": {
    "blockNumber": 18928,
    "sessionIndex": 315,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x34dc2f1cf53f3d49ed4c9613043658179634f3f54dca11f349fc957305b3724e42510137ef2001785d6f6be948d1f6e9ab707bf7a9b6392c62452d12c768b981"
}