{
  "manageEntity": {
    "action": "Update",
    "entityId": "594647240",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1787462946,\"track_id\":121304412}]}}",
    "nonce": "1787462954525493361",
    "signature": "0xe4dd39bbb8b73ce24a9035e447f5cb287a5d4d9124f24c73bb82784b8fb0503b0eca8a1954937ab9125b6723acff5ac3dd4de265875308d1a6c93aa66f6bbfa91b",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "664531520"
  }
}