{
  "manageEntity": {
    "action": "Save",
    "entityId": "903960104",
    "entityType": "Track",
    "nonce": "0x2e6b8736b58625de07ca97fe547ad4fae867eab61facbb61aa31fc6643a227be",
    "signature": "0xcfb7d175960cdccd8912d412749f17b31deed5d37b10175511222096ff9ea738263bd819c105a688467797ef6f2802a6a0a5c75156d5c44e3aab0acdd314d0771b",
    "signer": "0xD0f51E232A92DDc965FB1FE51d04200D15d10fc1",
    "userId": "536634479"
  }
}