Extrinsic 45400-1

{
  "heartbeat": {
    "blockNumber": 45398,
    "sessionIndex": 756,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x1402854b906a07d310662bff6153d9693307b02de937ba66a0b92677f32d9312a7fb7c64638355027a49bd31eeb5e9241b1253ff54cea966d48fdbe26b405e84"
}