{
  "manageEntity": {
    "action": "Save",
    "entityId": "469798",
    "entityType": "Track",
    "nonce": "0x21a6ed538edbb0b30d827f9bf78393177019952159cefa27185b6015a1389f96",
    "signature": "0x4f342093e8f034924fb3324c9c5ba2cc50353aa5c6aa9c8814714bc9ea4ce31159a4b63bb086c55ebfdb6c176056da1c64cdea760476d5ab93d25d2be2a7beaa1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}