{
  "manageEntity": {
    "action": "Save",
    "entityId": "518053",
    "entityType": "Track",
    "nonce": "0xf2c9b9721da243772ad8bcf9237e61633c45d537f947581233035428318bc1de",
    "signature": "0xe42bd7b2dd2a72079b5fa9883fcf95c5dc8116c19e89fd7f66ec6c93bcb5aa03294d9feb7f7a1efa315abf61a7cd911605cbccd3f74507f489d4a9885a11cf701b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}