{
  "manageEntity": {
    "action": "Save",
    "entityId": "1571613983",
    "entityType": "Track",
    "nonce": "0x1f266f3b3b856761222b2419234c451f98ada08db5c72d40ba2341830db471a5",
    "signature": "0x14e457a7625ba7ee26e17952a6726acb6a70e228980a1e4c77d698e116534b8310b8903de4f8026fa03605d921cf05e6d9ad6dbcc1ecd35fc6e53c70dca6065c1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}