Extrinsic 19489-1

{
  "heartbeat": {
    "blockNumber": 19487,
    "sessionIndex": 324,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x4a13cfc531c97051285bb9addd9d674e75b2c4a271875b2cdd6ab340dc5f9132993440b2e44d30a1d03f12c9dd2643746c4bf777ad3a5476ae8af432c25b5e8f"
}