Extrinsic 19456-1

{
  "heartbeat": {
    "blockNumber": 19455,
    "sessionIndex": 324,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb2c12c60fabda20fca183b9d701d425552ae39cb39281d52fff44c5b16cc591917d13cf503baa2e0a2012ef84fc4fdbef3851912eb1cd9e0d098cd59ba852784"
}