{
  "manageEntity": {
    "action": "Save",
    "entityId": "1597854698",
    "entityType": "Track",
    "nonce": "0x1b593994c03fc41e72badac062c52eac5a6c54e363dcfaef1e301e52f53bb7e1",
    "signature": "0x3d5245e3ac66a466fe8c37e86657406ffc724959013d9c191987c54b1b8a250566a35861d5de57deb7351727687a468034f8a50d34a62afe361f3f4830367bdd1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}