{
  "manageEntity": {
    "action": "Save",
    "entityId": "495696171",
    "entityType": "Track",
    "nonce": "0x21aa7b2db79e32abd122d6b6ccef7deb4546368b10d8256118ee9e4f9822784c",
    "signature": "0x9b1450748bcded065a53f803698ed9858ef4bf50d314877dfec224cf5214b56e25841980fc57a93b7ae6f602244a1ede475b5f5a4ff6c0f7482ded719171134b1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}