Extrinsic 17981-1

{
  "heartbeat": {
    "blockNumber": 17980,
    "sessionIndex": 299,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xf68902b43438d559e76e3c21ed6c03db7b340883a49aa84e621b76e6a7a0dd4da95547dcf8ede68f53e765f886f671ee93f00db796c0b776d448b84dc131f683"
}