{
  "manageEntity": {
    "action": "Update",
    "entityId": "594647240",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1787462946,\"track_id\":121304412}]}}",
    "nonce": "1787462946123515190",
    "signature": "0x1e4166f036d13981fbbee8a98399ee4ca16f43d91355649ca479396d0dc9259c31f0ded9be5ccd226b45d13ef87eddeb19f63b5935b7dec02750b9ac771944151b",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "664531520"
  }
}