{
  "manageEntity": {
    "action": "Save",
    "entityId": "1658895035",
    "entityType": "Track",
    "nonce": "0x604d903256e7f549d234aeb1024a90fa5053bef09133f5d950187a2cef540530",
    "signature": "0xfc472863cff018b5f0412aa16a89e63646761676d0714a1c9c864b51dc7f2d1d179dd67cf730f8a3d63fb724eae184f647277967ccf0a5aedf68200fa4e445f01c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}