{
  "manageEntity": {
    "action": "Save",
    "entityId": "468631",
    "entityType": "Track",
    "nonce": "0x803dec824596331979d31df2bdb6dfb2a2359e99d5026d1afc9ae563a0ffedcc",
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    "signer": "0x99b5F46ae3978FB02A645f824e51700B327f1d6e",
    "userId": "97654"
  }
}