{
  "manageEntity": {
    "action": "Save",
    "entityId": "1239372609",
    "entityType": "Track",
    "nonce": "0xd994f368756ab039bffe0b2c33f4c6a90725cbc6230354979c6f8a776791d3bf",
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    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}