{
  "manageEntity": {
    "action": "Save",
    "entityId": "217484769",
    "entityType": "Track",
    "nonce": "0x1490329e0d030e07bb2359361a6f3cb3f3b361837385f78e8e40e9f6774cece9",
    "signature": "0xc87d7dd5235e795db4d7cd8c1c8625bcf35ee5462d4900fa8f8d0da6c61df40c7bb18605c8f1996754825972abef1230d980c196516ffa39bdbbf0a872a0a5031b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}