{
  "manageEntity": {
    "action": "Save",
    "entityId": "747426485",
    "entityType": "Track",
    "nonce": "0x3a49e05750f1b8cba915372543241860ed03ce2e96dc171351a8e3c62ae64a8e",
    "signature": "0xe06864ae57a9194ebc4ea890002e520c54349e28298c58791f60b98fd2a516ec72e6d84949fced217956c7dcc62809d41a986944ccd95565efe19934239e22fd1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}