{
  "manageEntity": {
    "action": "Save",
    "entityId": "378903438",
    "entityType": "Track",
    "nonce": "0xf6a488a041b586b6cc83654ee133bc039d9ee523618bf162c4138e320d6ede3a",
    "signature": "0x88ad043281c08e836518a271935097eeb6f0ba8486a6ad35e216a511b78a1517070afbeb1c1d1a696b6f026f8109a164711fd46fa42254b46e71828d962acbfc1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}