{
  "manageEntity": {
    "action": "Save",
    "entityId": "1887536978",
    "entityType": "Track",
    "nonce": "0xc7ba74b84ac743b6ea9216e30e1a581d8c74c1b142bf26933f54074fa098d1a1",
    "signature": "0x8896e80cf823660758bf31179cae40a8b66ad94a722cd8c29882b0d615bd51d07dde6a7089ddbe5a0056749af11b6a44095c9aeb08c963efd8cb8d53eaf5f69b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}