{
  "manageEntity": {
    "action": "Save",
    "entityId": "840862615",
    "entityType": "Track",
    "nonce": "0x23218bf38662b14d4bfb189005187bc61969f9d58360426090a9a6e574b21dd0",
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    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}