Extrinsic 28220-1

{
  "heartbeat": {
    "blockNumber": 28219,
    "sessionIndex": 470,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x76e6410d8c0e8cc46183f5c5b80f1500c7f091746fae42ce247c94681abc6666e4ad8101c508226dcf66ba3a4d0ef732b1d26d6b205d80eec1d2bc238e898e88"
}