{
  "manageEntity": {
    "action": "Save",
    "entityId": "501207599",
    "entityType": "Track",
    "nonce": "0xb58561640c765ce5b8e132b1ade2edd651e66b6b0454c96add846b7c0268e7a1",
    "signature": "0xea90a5e52f99c58f0f21268c6dd3be02935700ccc715caef9afc22db7ac3dc8d2fd3429f8c694f23441496f9b35537d0023d4ad3b7fe36fcc538dd019396d66c1b",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}