{
  "manageEntity": {
    "action": "Save",
    "entityId": "158458765",
    "entityType": "Track",
    "nonce": "0x27e890f586cdc8de8e75834edb2c866066dbe1f56b18a5ea12fa4e484abb0a85",
    "signature": "0xb575a0b798564dac36ae12ff7ea7cd81d58a9af81c02e08bfa2c303fde92257b6496246637622758988cbf8606761ed884da1f15f52f957cd2f57d743dfdab711c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}