Extrinsic 19873-1

{
  "heartbeat": {
    "blockNumber": 19871,
    "sessionIndex": 331,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xf69eb8c448645cadaf61fe146ba1103e62b47f35a857e02d28fdda43906ad432811e0b2e332393ca6b2c2f033fed17598ce1522c8b7578666a3269e88795e182"
}