{
  "manageEntity": {
    "action": "Save",
    "entityId": "1177368626",
    "entityType": "Track",
    "nonce": "1788237577388635442",
    "signature": "0x669713c9739c528b4c1f788c859ab7f91c4a257c571957090bfa3dc1f8434c7b4551dfcca6b8c4bfb9e48f4954c560a8be7b6d9e10553d690811b195d78353491b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}