{
  "manageEntity": {
    "action": "Save",
    "entityId": "275128",
    "entityType": "Track",
    "nonce": "0x9516923f7b8a2a87a9e9a1de4cf77a00b1e9fac2bf8c8ad7c3c04d5b9fb15def",
    "signature": "0x521ec04c083ead146f4fcb026fa5dcea7010f3aa043afc40303905f9fffa2cc836ce329b92cd83e6168a20a0f2821592efd2c68f52a00037a6aadf058eb454851b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}