{
  "manageEntity": {
    "action": "Save",
    "entityId": "45912",
    "entityType": "Track",
    "nonce": "0xe9d374c82265f5d6ec064e7d0e542c845cb584b55036f5f542fd79ddaa15ad3b",
    "signature": "0x4d8cc530d9c483128831d369a534746eddfc26d7d04bcabc2a3fb2df77fc0b737245fe76ce7d4d46d42708a22fefa276e8e9385b3b8721401bf9b9ac1c22d65f1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}