{
  "manageEntity": {
    "action": "Update",
    "entityId": "594647240",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1788240364,\"track_id\":121304412}]}}",
    "nonce": "1788240372488504355",
    "signature": "0xa81f9988176b254fbebb7412f6d8f28365e018a1b043da5f23ffed1db0eb14c917047280e2f8384c7cc2d2a25642354fdf96c0b0f2de221be6b07d1f3d488a091b",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "664531520"
  }
}