Extrinsic 20503-1

{
  "heartbeat": {
    "blockNumber": 20501,
    "sessionIndex": 341,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x96ec597f721647d3c98117d6d33424e7dd8e96e3bbfe301e41e5ed5b34fdb7321c0f4906d2330f9075178bfeab0111f5e05ad8af7c45e40b7be2b770b5fd7d85"
}