{
  "manageEntity": {
    "action": "Save",
    "entityId": "265351187",
    "entityType": "Track",
    "nonce": "0x12ee56b893bd950cdfe013201e902797f2a0b4656fdb0d0efaa923b6c8d29ffe",
    "signature": "0xa7ce08388def76fa14915d81d6be94877348a4825603a9f8961c1b68e6fefd0272da354c41cdb869df3de9d895d68177009797804a3fd57a9099312d9ac388cb1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}