Extrinsic 3246-1

{
  "heartbeat": {
    "blockNumber": 3245,
    "sessionIndex": 54,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xccc381d63cb344ae94ad2ce0a554fe7e50bb4cbe557b828d31932a4178aab27e3f8a5154d6a3880180761e386d91ca4c65fad289d5bfbc095d1f9ef656531d8e"
}