{
  "manageEntity": {
    "action": "Save",
    "entityId": "412502",
    "entityType": "Track",
    "nonce": "0xf50ae06766b55b2fbdd747ff5c18e661ae89c46603134949d5c865b4e5355968",
    "signature": "0x90460c1b1e3f5247dc90e50353028fde70673699fcf01527adb7268396b4ab994720c597430db536e5f7c026224994dec97e5ed8c991cc78fc3803573f04ef6f1c",
    "signer": "0xAD8896bd476731C3a0bc67E2096615E0168A625E",
    "userId": "519340031"
  }
}