Extrinsic 19126-1

{
  "heartbeat": {
    "blockNumber": 19125,
    "sessionIndex": 318,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xee31bfa9a35f3ab9b82ececfc01c09940ed30df92ae83906d80da39b2492574e6ce5d9c338ce8bea54d1318a54d286576b319ac3e6821175e7ba31395c314285"
}