{
  "manageEntity": {
    "action": "Update",
    "entityId": "594647240",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1787462946,\"track_id\":121304412}]}}",
    "nonce": "1787462963464574124",
    "signature": "0x0438a2ba594894f929bc069f7c5b0646927d6cd9de9aae75a8abb40d36bdf5541c4b87430593f0973a985fd444afcf9157ff3e9c5ae0f3e1f1afee203b61f3fe1c",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "664531520"
  }
}