{
  "manageEntity": {
    "action": "Save",
    "entityId": "326189515",
    "entityType": "Track",
    "nonce": "0x5cf310fe1fe3cf74388cc0176160ff29d8becbdd174de237a14277968258b0d9",
    "signature": "0x10a0eeb973c297a10948774afe00beacdf4fabbd115532f2a2062acb6eddb5591f3142f30265f4a0ad8c2c643702043476d9a98b6f24ab4c155e2c62c221d7fb1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}