{
  "manageEntity": {
    "action": "Save",
    "entityId": "429450266",
    "entityType": "Track",
    "nonce": "0xaa1526c2cd3c913c616e8b638115fc967fb4d3698fdf01ae1fd82926aea867cd",
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    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}