{
  "manageEntity": {
    "action": "Save",
    "entityId": "504458",
    "entityType": "Track",
    "nonce": "0xd5fbcc339010c673397b2661110416714f021d3d849cc92893c6a9a53ee1864b",
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    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}