{
  "manageEntity": {
    "action": "Update",
    "entityId": "1621150187",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1788634743,\"track_id\":42082}]}}",
    "nonce": "1788634743985546134",
    "signature": "0x92d3ae6f78c0d560ee418653c4384e9b14c97fd29d1a03cd4e7b1e66dd26317833e897bb97be9155cd380cdfd47b3f28788a1d6ef07f5a5ab57017e064a9f6e51b",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "197523139"
  }
}