{
  "manageEntity": {
    "action": "Save",
    "entityId": "302942159",
    "entityType": "Track",
    "nonce": "0x0876f2194bb12833b72b7c60a2dc069a69d6b49486764e072075068df2d54832",
    "signature": "0x4522581c588199a9313deff70309e60426c0b19467b1c22701549e1330da9f3e2719089f4e85dc676af98f5e51f0b5cd79ca0b49ae16fae529687f91bcb27ce91b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}