{
  "manageEntity": {
    "action": "Save",
    "entityId": "438206",
    "entityType": "Track",
    "nonce": "0x74863287cfaca033ed6e55ca88b233e8a7b03a9985fb85674e33549467039b92",
    "signature": "0x9b91ed8515a5de21753e72eb91c39ea3f197a3216b9ecb4154ffd638f5f4e57b4f604608394d114525bad7d8aa526dec7641f3ca51fd9c9432204b4f0a2a4c781b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}