Extrinsic 2979-1

{
  "heartbeat": {
    "blockNumber": 2978,
    "sessionIndex": 49,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xd2ea91d4b854bea759b987a9329a3b5e238dce5c213ccd66235eb9be914dda1c516a0eab5c6803d5c3b00c5f489af323bea0b19bddaeac0e0fbfb4bcfd961188"
}