{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4c37228e7912e5fdb3164b55191d3d215f4d2c3304d615ba85a36350f946c1b5",
    "signature": "0xe1979a6cc1292677259ab709ddbfa3306c0855404657053ac340cc7cd472c8af7bbb3cd8622c3a8a70f9ce7ac09d139920a041035f107a988e5da355f32769211c",
    "signer": "0x4daC0c968A91B0467f12689ebBF7dC23E84a6a59",
    "userId": "467821671"
  }
}