{
  "manageEntity": {
    "action": "Update",
    "entityId": "594647240",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1787894841,\"track_id\":121304412}]}}",
    "nonce": "1787894841452319293",
    "signature": "0x8911f937c47d765088a251e696a49ee2641e217e516a61fc28aa30a208e5f0fd4c72dec41f85ff0b88d0e4acf982e9a28b0a111fd0ea0f71b61bcd5a0867ced21c",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "664531520"
  }
}