{
  "manageEntity": {
    "action": "Save",
    "entityId": "1604855433",
    "entityType": "Track",
    "nonce": "0x3a426ebe9c3ce53544a750bd02193b5f413a5677a84a4e3526494735fe86c04e",
    "signature": "0x199eb0fa819862ad31925386ae37ed05a61e95469139dc757e3a2f891f01bc2313495d03130b5cfabe15a3eba3302433677e62acae43c45c7b2d0c10f8a736cb1c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}