{
  "manageEntity": {
    "action": "Save",
    "entityId": "541518",
    "entityType": "Track",
    "nonce": "0x8e5bc434f6fb17bc20ce8ae2bb921d83002ce092aa2b7648c32ec8e771cacf58",
    "signature": "0x8096bccf5c8c7f4607a8a2ec224042aeea14e2b7da3ce60aaee4eaff2783d3335283d1865dac663e37b380c9b9e97e8b6a72c30cf4255d040165c1bc4c498bc01b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}