{
  "manageEntity": {
    "action": "Save",
    "entityId": "930586904",
    "entityType": "Track",
    "nonce": "0x1234e4ca571dce18a344b6449755c647c8cc14c1ca4a251d81f5be2f12c4dead",
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    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}