{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554866529",
    "entityType": "Track",
    "nonce": "0x73dd93a1d68061e8e95b39b7cd720b9d780d1882010f5f321ee5f6bc0fe83f12",
    "signature": "0xf389281743b8785b8aaa087da028c64f6a23e56856f8532e5c572fab27135da862db18bc53ee8ce2d23a7113bf76e54e50edfe9213c9483aa2d55ddc4d7f39311b",
    "signer": "0xbb3a61e183bb067d10DEE2e5a00392DE9ca6B48D",
    "userId": "528440778"
  }
}