{
  "manageEntity": {
    "action": "Save",
    "entityId": "892082483",
    "entityType": "Track",
    "nonce": "0x2913a305a8db13a5a20cb050b0bb96d6ab8e979e403ce350d4a1ec12dcd9c12b",
    "signature": "0xc57d8780041dcf01a47f3fe8e62f014b95a27b783d3d07d78a4bd7eccdb7e0bb4421270c55a0e2a6bf73e8521f68a9ac621e979eaaaa9a251c890585f4ce8e1e1b",
    "signer": "0x8FF85C5AA450a88f13FbD5170e24E2a3eFF32518",
    "userId": "311829956"
  }
}