Extrinsic 3259-1

{
  "heartbeat": {
    "blockNumber": 3257,
    "sessionIndex": 54,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x727624a179283baf261d6fa366df3cb47003dccd832f357838aaad96fa5df31b9c64aeec6dcef6260664e56af528fff4bc94bc74655f416ecf7a9d9e98392f82"
}