{
  "manageEntity": {
    "action": "Save",
    "entityId": "479768",
    "entityType": "Track",
    "nonce": "0x3841fb3f77dcc041857fa203c196735bfff22b32660e733604e0123a77ca823f",
    "signature": "0xa8e17c6e33e3794aa9a88e6b35c0dfa13999c43d42374ebedfc994b7e5a7bbef60a9e26469470a232f480cc56724260c34191c606aca6ab234788594cf549b911c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}