{
  "manageEntity": {
    "action": "Save",
    "entityId": "1029481247",
    "entityType": "Track",
    "nonce": "0xe210a804ccabf645cf9e3b8f9aac8cfae29823b120e615f99f80666e279970a8",
    "signature": "0xd38dcefd2f0596698b66739582a775b478d6dfbcfd79b86c57cc56160e6c0f6f02d1303af49b8edcc5a20e4ec54a5f3adada6efa88f008e21c4dee20b6d386641c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}