{
  "manageEntity": {
    "action": "Save",
    "entityId": "540441965",
    "entityType": "Track",
    "nonce": "0x9e46b73e4c09a6ee7873766ba49efbf9a3125cba1ff7a7847a6559447b1a217e",
    "signature": "0x9ee2cc17170c994660c87c7472c81f6bf52760cdde62ad286587247e1cf14c1177227ee48fa8d79f56904437dfbde4a2413ec02414d68ba966d8d000cfc3b03c1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}