{
  "manageEntity": {
    "action": "Save",
    "entityId": "900512468",
    "entityType": "Track",
    "nonce": "0x61268e0c654068b3373a849a6fd7c40b49b62ef14939fae614e29351121eef4a",
    "signature": "0xd419a35f8e976e3a8ad854e5b83e3ee006f590342ce3b1293261277f7eeac08711ae866f5d1211fd6362497da1008ca0ccb7adbf4e4ba65640585b7ba7b4a5f41b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}