{
  "manageEntity": {
    "action": "Save",
    "entityId": "804078527",
    "entityType": "Track",
    "nonce": "0xa0e2632f1dcc03e5f50f3c9525cf4c427c3f75f21e3ccddeb501b29dded2ad32",
    "signature": "0x3c559e6873d1df1eb6cf3009f73ed9dfd735b206ddda7ac635e95824d001538a5d6e1c82239e15c8b8a32ade59f11e30959c64ab93451de33269b46fc79255931c",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}