{
  "manageEntity": {
    "action": "Save",
    "entityId": "741468",
    "entityType": "Track",
    "nonce": "0x7cecf24be95732f5a7f5fc93f61e14da677b3dfcfd7c196c6e0000297ecf7e56",
    "signature": "0x4a1cd2ea6dcbede5640160c66d06c95d53d43d04d14c1a4115fdd4c0d6da461f6e7618e10aad8cbbbd8ec38cd81a3c17b957ed90e875d072e95b86e940c275d51c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}