{
  "manageEntity": {
    "action": "Save",
    "entityId": "33902410",
    "entityType": "Track",
    "nonce": "0xd87be6812b6b5d05fd91a5f0dee092721c2de43681465961fe72def029f6d07d",
    "signature": "0xcf80be0da5c31b4ef40c45fb6b87f373f3aea448c32fe393cb40abc5be4dd3ea434c8c8d606bcc5f361ce26bf75c15f2927a91a3eb726b46bb68d2ab1abb75941b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}