Extrinsic 12571-1

{
  "heartbeat": {
    "blockNumber": 12570,
    "sessionIndex": 209,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xe0ebeb39f27a44f007755cc44b2b8f5c64608036a3e1c987e3ba0bf8452ae54761bcdb18113730506a620bf5ac311b865136c37ad9a970e9a8f1e4483a0bad8e"
}