Extrinsic 1246-1

{
  "heartbeat": {
    "blockNumber": 1244,
    "sessionIndex": 20,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x8e3d7f60b2ca6366d1756a58016ac93a3f92653df7844ad766c8ae8d7728271e273d7f051351996c92139948e8f16dcc3924c0c4a4ddf9a7d5ffa14cffbf4e8f"
}