{
  "manageEntity": {
    "action": "Save",
    "entityId": "757821401",
    "entityType": "Track",
    "nonce": "0xb2530c3de849e3844087234de48825870ffeb566cff7d0fffb6afb6d1bf5a98c",
    "signature": "0x2415b3cf15fd3ca2ad5d9ea327ea900e39b732e7bd62cf7037625ca99ad46191719560105f6fbae0f97899637c01db27a37d6c4c35b5f14484be761f17b7fc851b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}