{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x11d0bc05d7b26b6635e783144d460f7b5948281d89848fe9ad51763bc2991ccd",
    "signature": "0xbdb1c5623b3a072555b083abb9a02c8fbd57fd26fb39badcde099f2950a363506968647464ce5abfbb9ebd89dbb55f079c1b7b52767cb4d85e3e5caedf8abd041b",
    "signer": "0xe8BAaf9d67869BFe993951C60524b67BC331bac9",
    "userId": "75683930"
  }
}