Extrinsic 19403-1

{
  "heartbeat": {
    "blockNumber": 19401,
    "sessionIndex": 323,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xc21efb50bc8e3772b87a26c96735ab2f361eb1c44fdf959ce98a0fc12a3cc55454ab36248ceaf501eea0f69388bfb5a46113119c7a57b0e8583db111adc3d687"
}