{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4031c76104df491d73931ab755e47cc404cdfd88529a5eccae5cfaa4a11352b9",
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    "signer": "0x3A25162935B033F53f1C057B6EacdFA4472E0400",
    "userId": "487939004"
  }
}