Extrinsic 20785-1

{
  "heartbeat": {
    "blockNumber": 20784,
    "sessionIndex": 346,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x385288b65506f341b6dcc9f000d1eab90736e685faa99d7240b4a792eb5ec074e03a5c148d47da774f7c8fb04c82198b72c1d01211ccd89ead41acca4dd63e8e"
}