{
  "manageEntity": {
    "action": "Save",
    "entityId": "223339",
    "entityType": "Track",
    "nonce": "0x5421de90239b73a6f4f05d97d5d7cdf7782ee64f8b27ab19541227303c2fc750",
    "signature": "0xedacd8a69e3626bac223589ab4f2fe87195406479097f74ad96093a7a6c0a7f95a7902dabae6765c0b8e2eda25fa016ca49df8f2d34a6370ccd94de3aff282131c",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}