{
  "manageEntity": {
    "action": "Save",
    "entityId": "829373114",
    "entityType": "Track",
    "nonce": "0x686400e6f024e101e4a0c96cf0001787aecd3457c9b3eee21f886b4a5827fc3a",
    "signature": "0xa6c57662ac3898c985387569c137db129db079728525ad12b8ec5962027eedf706b4281e905922c06d7772539572b62bba7244dc509b7ee7629423372404de9a1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}