{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4438727fe50fa52cfc57b6149431d53061956c7d2d9a9ec9e028d082a21cc7b3",
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    "signer": "0xb451D8056c78ab09F2fc77592649c3cc305ac8e7",
    "userId": "757517997"
  }
}