{
  "manageEntity": {
    "action": "Save",
    "entityId": "756624349",
    "entityType": "Track",
    "nonce": "1788737776500941650",
    "signature": "0x48b547e4013fe079809add5bda63b5de15d051b3b75a7177a15858172eff667018a68ebc98b5153a42d9fb893f96200a1f5bf3ec0d0afe1fa7b03e628be1e8fa1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}