{
  "manageEntity": {
    "action": "Save",
    "entityId": "264533",
    "entityType": "Track",
    "nonce": "0xf1d1b281a2f8653837856c8118c5dc6708ddee35c7a03379999c1f8205a1d4e7",
    "signature": "0xb3c5770ce6895148e5dff809b7d0906fff0d2300ede00cb5e8b78c78532ddf3762cb163991e12ec5cb4fa3330d15f446fc32898acaf2e2f5bc87e5431ad34edb1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}