{
  "manageEntity": {
    "action": "Save",
    "entityId": "520346",
    "entityType": "Track",
    "nonce": "0xbcb21dd4a8ef7c5f1b395c146152385cc00642c576916656a14fd9a562030651",
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    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}