{
  "manageEntity": {
    "action": "Save",
    "entityId": "437308319",
    "entityType": "Track",
    "nonce": "0xa9732f8f0d8a00c5a919bf5a247dfda991e990c435d742ad20d8564b88280e98",
    "signature": "0xe4b8b3dc03e5bbf32fa6a9fd01cbf0192ef7ce14fb801fc4a16004dfd8c26c9f4faca9c3db6be794d34cd0123fd0ed52211517e90297d6b2118b678f77f337141c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}