{
  "manageEntity": {
    "action": "Save",
    "entityId": "544194",
    "entityType": "Track",
    "nonce": "0x4e22762578b5cac11f5835384c7a44b3f5088d7a5ff8a884e5daff497b1daa4f",
    "signature": "0x68b5619bdc3c331bbe82d588ba344f7c4610d4b60253ff4dbc7dcc71c667b7ff2f476a0a6e3c820de11f0ef4d4bd88a21346465b96e458888c4885f6bccad85f1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}