Extrinsic 20619-1

{
  "heartbeat": {
    "blockNumber": 20617,
    "sessionIndex": 343,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x2e8b41014c421044b5ed971aa88b3d96e13807900e6a389a3b9cba005e7e03268f266db2daecbe92abdfdf55f1292f6b057ac9f2cb47153412ded9637105fc8c"
}