{
  "manageEntity": {
    "action": "Save",
    "entityId": "850332564",
    "entityType": "Track",
    "nonce": "0x83c269f2d2c92370e22b2df86a2c8983e60fe849035606404d3fdf539cb16b51",
    "signature": "0xda1d468be71e24bbf68b9aaf8ad02a32b279b1bd8a85e552f3a421ff39f8deb21c17e230043b2aa16e5a189efbcf91d2f30c7d49703a116836186f73976a99ef1c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}