{
  "manageEntity": {
    "action": "Update",
    "entityId": "1375462919",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1786768496,\"track_id\":39898},{\"timestamp\":1786768496,\"track_id\":42081}]}}",
    "nonce": "1786768496685288771",
    "signature": "0x79278e85c071f106d5070ea40500b50899ba4130576dad46e05a49d9870620fc1a919b36f799c782ec4752b7c3dd843c0799acc7786a579d08d4bcb955dab21e1c",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "188115624"
  }
}