Extrinsic 31216-2

{
  "heartbeat": {
    "blockNumber": 31214,
    "sessionIndex": 520,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xf249199f71ff8de2b0a78025a583748e3707c48ea0876d8390d5e302dfa2726282ce854f2a321f6e865da09ed08c593372fed90bea92405150b1988cedc70380"
}