{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc45c88d68eb672d49e2429d373f82098b251643d56e0cc2cc446af0004936969",
    "signature": "0x593ddfa1f17c7342cde696eda48142ab9694750166de7afec0a7c31ea851a6db086bf70a77182b94823736e9b12ce8a3f6036c8a5e57314c3234aa9c84b600281c",
    "signer": "0x5Ed82350F9b842a704EF21b810d52cd4A8753A4C",
    "userId": "16412261"
  }
}