{
  "manageEntity": {
    "action": "Save",
    "entityId": "974380538",
    "entityType": "Track",
    "nonce": "0x105db15f00cd9db946cb62496321d6473e386bbaa719fbd1730b93ee17fca45e",
    "signature": "0xe309d1f47e5b0855921aff010b35512bb3eb172deb84432db4ddca869a7e9e4c14e208ce654d03a677004eeda02107988fc85563c7d5e3ac128980db545f0df41b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}