Extrinsic 20739-1

{
  "heartbeat": {
    "blockNumber": 20737,
    "sessionIndex": 345,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x12182c1a65e6023aa1f53fa8bd24a9f139b46c3f796174ab9606c3607d6c8546b2ef976324cd61bd740e59e97259a7aa531327d7e83f366b76e96cd725853081"
}